Passive bookshelf speakers do. They require an external amplifier or AV receiver. Active or powered bookshelf speakers have built-in amplifiers and can connect directly to audio sources such as TVs, turntables, preamplifiers, and computers.

Passive speakers are unpowered and require an external amp or receiver. Powered or active bookshelf speakers have built-in amplification, often with Bluetooth or digital inputs. Powered speakers are more convenient while passive ones allow more customization.

When pairing an amplifier to a bookshelf speaker, it is important to consider the speakers sensitivity rating and impedance. If the speakers are 4ohm or less, it is critical that the amplifier can handle low impedance to ensure proper headroom without distortion. Higher current amps will handle 4 ohm speakers better. A speakers sensitivity rating determines how loud the speaker will play. A sensitivity rating 90 db or higher will be more efficient and play louder with the same wattage than a speaker with a sensitivity rating under 90 db.

Many bookshelf speakers produce excellent mid-range and treble, however due to their more compact size compared to floorstanding speakers, they typically lack deep bass. Adding a subwoofer will fill this void and the end result is a more fuller, balanced sound that is especially ideal for home theater applications and many music genres.

Front-ported speakers have a port located in the front of the speakers typically below the drivers. With this orientation, placement is less important and can be placed close to a wall. This option is especially ideal for desktop or wall-mounted setups. Rear-ported bookshelf speakers have a port behind the speaker and the low frequency sound is directed away and towards the wall. The advantage of a rear port is deeper, more extended bass that typically sounds more open and natural. The disadvantage is placement is not as flexible and it is recommended to place no closer than 12 inches from any walls. In many cases, bookshelf speakers will come with port bungs which help in diminishing unwanted boominess.

A CD (Compact Disc) stores standard digital audio at a resolution of 16-bit/44.1kHz which is often referred to as CD quality resolution. An SACD (Super Audio CD) uses a higher-resolution format called DSD (Direct Stream Digital), offering better dynamic range, frequency response, and more natural sound. SACDs can also support multi-channel surround sound.

Yes, almost all SACD players are backward-compatible, meaning they can play standard CDs without issue. Standard CD players however are NOT compatible with SACDs.

Having a high-quality DAC (Digital-to-Analog Converter) will provide a cleaner, more detailed sound. Build quality and a stable disc transport will reduce vibration and read errors. Lastly, a quality, low-noise analog output stage with well designed circuitry is essential for hearing a smoother, more natural sound.

Yes, as long as your system has a line-level analog input (RCA) normally labeled as "CD, INPUT, ETC" or compatible digital input (optical/coaxial). Just check that your amplifier or receiver has matching connections.

A CD player performs the complete process, including internal Digital to Analog conversion, to produce an analog audio signal for immediate playback. A CD transport reads the digital data from a CD and outputs it digitally to a required external Digital-to-Analog Converter (DAC). In short, a transport only handles the digital signal extraction and requires a separate DAC, whereas a standard CD player integrates the DAC to provide an analog output.

RCA/XLR interconnect cables carry an analog signal from your CD player to your amplifier or receiver. Cables with better shielding and materials will provide a lower noise floor with less hum and interference. Higher quality cables also have a more secure connection and won't corrode over time. Also, higher grade cables are simply mechanically superior and result in a stronger and more stable signal. Your ears will notice a cleaner, quieter, more refined sound.

If you’re watching mostly movies or TV, it is essential for clear dialogue and balanced surround sound. For a stereo setup for music, it is not required. 

This is very important, you ideally want to match your front and left speakers with a center channel using the same drivers and tweeters. With all drivers and tweeters equivalent, this will ensure a tonal balance as sounds transition from the side speakers to the center and visa versa.

A center channel speaker should be positioned either directly above or below your TV, centered to the screen. If possible, angle the drivers toward the listening ear height position. Avoid placing inside an enclosed cabinet or shelf which could result in muffled sound.

Typically, 80Hz to 100 Hz is the ideal crossover setting to ensure the best imaging, clarity, and detail for dialogue. Center channel speakers should always be set to "small" in your receiver setup menu. 

The most common tweeter type is dome tweeter which can be either soft dome or hard dome. Soft-dome tweeters such as silk are typically less harsh sounding and smoother. Hard dome tweeters such as aluminum or beryllium offer the greatest detail however can sound harsh, especially with a more reflective room. Other tweeter styles are Ribbon and AMT (Air motion transformer). Ribbon tweeters are very accurate but also very fragile. AMT tweeters is a variation of ribbon that generate a lively sound and are more efficient. Lastly, horn tweeters are very efficient and ideal for larger rooms for the best projection of sound.

A DAC, or Digital-to-Analog Converter, converts digital audio signals from sources such as computer, TV, or streamer, into the analog sound your speakers or headphones can play. Almost every digital device has a built-in DAC, however an external DAC typically delivers clearer, more detailed, and more accurate sound.

There are multiple methods. You can connect your digital source such as PC or streamer to the DAC using USB, optical, or coaxial cables. Then, connect the DAC’s analog outputs (RCA or balanced XLR) to your preamplifier or powered speakers.

Yes absolutely. Higher sampling rates (192 kHz and up) and bit depths (24 bit, 32-bit) increase captured detail and dynamic range. CD quality is 16 bit/44.1kHz and resolutions above this will result in lower distortion, larger headroom and a more detailed quality sound. It is also important to note audible improvements will depend on the source quality.

Audio jitter is a simple term for timing errors or instability in a digital audio signal's clock. In a perfect digital system, audio samples are captured and played back at precise, regular intervals. Jitter occurs when these intervals deviate slightly from their intended timing. A high quality DAC will reduce or suppress jitter and the end result is a smoother digital to analog conversion and cleaner timing.

Yes, absolutely. This is one of the more popular reasons to use a higher resolution DAC. Music streaming services such as Spotify, Tidal, and Qobuz will allow you to enjoy higher resolution audio through a quality DAC.

PCM (Pulse Code Modulation) is the standard for CDs and most digital audio due to its simplicity and compatibility. DSD (Direct Stream Digital), found on SACDs and lossless formats, provides a more "analog-like" sound through its high sampling rate.

When pairing an amplifier to a floorstanding speaker, it is important to consider the speakers sensitivity rating and impedance. If the speakers are 4ohm or less, it is critical that the amplifier can handle low impedance to ensure proper headroom without distortion. Higher current amps will handle 4 ohm speakers better. A speakers sensitivity rating determines how loud the speaker will play. A sensitivity rating 90 db or higher will be more efficient and play louder with the same wattage than a speaker with a sensitivity rating under 90 db.

Some premium models can extend down to 30 Hz or lower, sufficient for music. For home theater applications and certain music genres, a dedicated subwoofer still provides superior low-end control and headroom and will improve your listening experience.

Typically 2 to 3 feet from the rear wall to allow bass to develop naturally and prevent boominess, though this varies by speaker and port type. Rear-ported speakers need more space, while front-ported ones can be closer. Experiment by moving speakers closer to the wall to boost bass and further away for more depth, finding the balance where the bass is clear and defined. It is also often recommended to "toe-in" your speakers typically around 15-30 degrees. The goal of this is to find the most ideal balance for natural vocals and also the widest and deepest soundstage.

For small rooms (under 150 sq. ft), choose compact towers with smaller woofers (5–6.5"). for Medium-sized rooms (150–300 sq. ft, mid-sized towers with dual 6.5" or 8" woofers work well. For large rooms (300+ sq. ft), opt for full-range speakers with larger woofers (8–10") for deeper bass and greater room-filling volume.

2-way speakers have a woofer for low frequency and a tweeter for high frequencies, they lack a mid-range speaker. A 3-way speaker adds a mid-range driver which improves clarity and separation. A 4-way speaker adds a 4th driver, typically this is a super tweeter which will result in the highest detail high frequencies and the best separation.

An integrated amplifier combines a preamplifier and a power amplifier in a single chassis. The preamplifier section handles source selection, volume control, and sometimes tone control. The power amplifier section boosts the signal enough to drive speakers. An integrated amplifier is a convenient all-in-one solution for most 2 channel home audio systems.

Certain integrated amplifiers can power 2 pairs of speakers at the same time, they would need to have a total of 2 pairs of speaker terminals, typically labeled "Speaker A" and "Speaker B". In addition, the integrated amp would need to allow Speaker A+B mode. With this setting enabled, you will be able to power 2 pairs of speakers simultaneously. It is highly recommended that both pairs of speakers are 8 ohms impedance since the speaker terminals are run in parallel and therefore the impedance will drop from 8 ohms to 4 ohms if running both pairs at once. 

Yes, the majority of integrated amplifiers have a built-in phono stage and this is labeled in the rear panel as "Phono".

Yes, the subwoofer would need to be a powered subwoofer and many integrated amps have a pre-out or sub-out RCA connection to connect a powered subwoofer. If there is no sub-out or pre-out, some subs can use high-level (speaker) inputs directly from the amp’s outputs. With this method, volume control will be adjusted by using the knobs on the subwoofer itself. The crossover settings would also be adjusted using the low pass filter know on the subwoofer.

Integrated amplifiers have several different types of amplifiers classes. Class A provides the best overall sound quality however the least efficient and as a result will run hot. Class AB is the most common amplifier class which is a middle ground with great quality sound but more efficient, runs on the warm side. Class D is the most efficient class of amps, this runs the coolest and is an excellent option for lower impedance and lower sensitivity speakers.

Audio interconnect cables connect line-level signal devices. For example, a CD player to an integrated amplifier, A/V receiver, etc. or a pre-amp to a power amplifier. They transmit the audio signal from one component to another. 

Audio interconnect cables connect line-level signal devices. For example, a CD player to an integrated amplifier, A/V receiver, etc. or a pre-amp to a power amplifier. They transmit the audio signal from one component to another. 

RCA Cables, the most commonly used, uses two wires (signal and ground) which could result in hum and interference over long distances. XLR or balanced cables contain 3 wires: positive, negative, and ground. It's design helps reduce noise and is the recommended cable choice for longer distances.

Typically the cost of an interconnect cable depends on the materials inside. More copper or silver content will be more pricey however will result in improved sound quality such as more detail and tighter, more defined bass. Cables with advanced shielding will also contribute to a higher fidelity sound and lower noise.

The shorter distance the better. It is most ideal to arrange your components to accommodate the shortest connection. This will prevent signal loss from occurring by lowering capacitance which increases with the length. 

Absolutely. In-ceiling speakers are perfect for overhead channels in Dolby Atmos or DTS:X setups, adding height and immersion to your sound field.

Yes. Many brands offer weather-resistant or moisture-rated speakers suitable for bathrooms, covered patios, or pool areas.

Some models include built-in enclosures, while others benefit from adding a back box to reduce sound leakage into other adjacent rooms.

Absolutely, you can. In fact, many in-ceiling speakers have a pivoting tweeter which can be used to direct sound toward the primary listening area for improved clarity and immersion for surround sound applications.

Stereo input in-ceiling speakers are used for music applications and not ideal for home theater setups. Small rooms where there is not enough space for 2 speakers are a perfect candidate for using a stereo input speaker such as a bathroom or small bedroom.

Typically, regardless of the wirer run, we suggest 14 gauge at a minimum for small to medium runs and for longer runs we recommend 12 gauge.  Ensure the wire is CL3 rated for in-wall and in-ceiling installation.

Some models include built-in enclosures, while others benefit from adding a back box to reduce sound leakage into other adjacent rooms.

For dedicated home theater setups, the front 3 channels (left, right, and center) should be at ear level from the seated position. Surround in-wall speakers are best at 6-12 inches above ear level. 

Not Necessarily. Choosing between in-wall speakers and traditional floorstanding or bookshelf speakers depends on your priorities. Floorstanding speakers typically provide the best performance especially for larger rooms. In-wall speakers are much more discrete and best for a minimalist appearance and the speaker grills can also be painted to blend with your wall or decor. In-wall speakers typically lack low frequency bass so adding a subwoofer is more impactful and necessary than with traditional speakers.

Typically, regardless of the wirer run, we suggest 14 gauge at a minimum for small to medium runs and for longer runs we recommend 12 gauge.  Ensure the wire is CL3 rated for in-wall and in-ceiling installation.

It is not recommended to mix different speaker brands. It is best to use the same brand especially for the front 3 channels (left, right, and center). This ensures the speakers are all voice-matched which will produce a seamless, consistent sound as audio transitions across the soundstage.

Yes, in-wall speakers are an excellent candidate for surround sound, offering a seamless, minimalist aesthetic while providing immersive audio. They can be used for side surrounds, rear surrounds, and even height channels in setups like Dolby Atmos.

A music streamer is a device that connects to your home audio system and allows you to play digital music from online services (Pandora, Spotify, TIDAL, Qobuz, Apple Music, etc), your local network, or a USB drive. For better sound quality and more convenient access to your entire music library without relying on Bluetooth or a computer, a dedicated music streamer is the way to go.

Bluetooth and AirPlay work well for casual listening, but a dedicated streamer delivers superior high resolution audio, lower noise floor, and supports lossless or hi-res playback. Many streamers also offer advanced DACs (digital-to-analog converters) and stable wired connections for audiophile-grade performance.

Some music streamers include a built-in DAC that converts digital music into analog sound ready for your amplifier. Others, often referred to as a streamer transport, output a digital signal only. A streamer transport is ideal if you already own a high-end DAC.

Absolutely. Nearly all music streamers include a companion app that lets you browse music, create playlists, and adjust playback right from your smartphone or tablet. Some also work with voice assistants like Alexa or Google Assistant.

Yes. Most streamers can access music stored on a NAS drive, USB stick, or local network. Supported formats typically include MP3, FLAC, WAV, AIFF, and DSD for high-resolution playback.

To connect a music streamer to an amp or receiver, use analog RCA cables for analog outputs or digital cables (optical, coaxial, or HDMI) for digital outputs, connecting the streamer's outputs to corresponding inputs on your amplifier or receiver. For network connection, wirelessly connect the streamer to your home Wi-Fi or use an Ethernet cable for a wired, more stable link.

Weather-resistant speakers can handle light rain, splashes, and humidity. They are best installed under eaves or covered patios. Waterproof speakers can be fully submerged in water (usually to a specific depth for a certain amount of time). These are ideal for poolside areas or spots where they might get hit directly by a garden hose.

Nearly all outdoor speakers are passive. They do not have a built-in power source such as an amplifier and must be connected to an amplifier or receiver.

For outdoor use, it is recommended to use CL3-rated, UV-resistant wire designed for outdoor use. Also, it is essential to use direct burial cable if you plan to bury in the ground. For speaker gauge, 14-gauge is typically recommended for runs over 100 feet, and 12 gauge for extended lengths. 

Outdoor speaker systems primarily use two types of power distribution: Standard 8-ohm or 70-volt/100-volt. Many outdoor speakers will allow either type. For longer runs of speaker wire, 70V/100V will provide less voltage drop. Another advantage of 70-volt/100-volt is the ability to daisy chain multiple speakers without having to run dedicated lines to each one; however 70-volt/100-volt systems typically do not have as good of sound quality as a standard 8ohm system.

Outdoor speakers  typically require more power than indoors to achieve the same perceived volume. For a small patio, 100 watts per channel might be sufficient, while larger areas of 600-800 sq ft would greatly benefit from 150-175 watts per channel.

The main difference is how the signal is generated. MM cartridges use magnets that move around coils and tend to have replaceable styli, higher output levels, and lower cost. MC cartridges use moving coils instead, offering more precise sound and detail but at a higher price. Most MC cartridges have non-replaceable styli that require specialized phono preamps.

Most turntables use a standard half-inch mount, which is the most common type. Some use P-mount cartridges that simply plug in. You should also confirm compatibility with your preamp/amplifier and consider the cartridge's weight. Consulting your turntable's manual is the best way to ensure a proper fit. 

The stylus typically lasts 500 to 1,000 hours depending on quality, tracking force, and the cleanliness of the record. Some people replace the entire cartridge after a few years to match improved systems or personal taste. Regularly inspect your stylus under good light and if it looks worn or sounds distorted, then it is likely time to replace it.

Yes, most definitely. Proper alignment along with correct tracking force and anti-skate settings are all critical for the best sound as well as the maximizing the longevity of your cartridge. Many turntables come with alignment guides, or you can use a protractor and stylus gauge to fine-tune setup for optimal performance.

In many cases, yes this is an option for most moving magnet phono cartridges. The stylus can be replaced easily. However, for MC cartridges, the stylus is usually built-in so this would require the cartridge to be replaced or re-tipped.

Yes, a phono preamp is required, as this is what will equalize and boost the signal coming from the cartridge. It is important to note that many phono preamps only support MM cartridges due to MC cartridges requiring higher gain and more adjustment settings. Always ensure your phono preamp is capable of supporting MC if you have a MC cartridge.

A phono preamplifier (or phono stage) amplifies the very low-level signal output from a turntable’s cartridge to line level so it can be properly processed by an amplifier or receiver. It also applies RIAA equalization to restore the tonal balance that was reduced during vinyl production. 

For MM cartridges: 35–45 dB of gain is necessary. For MC cartridges, 55–70 dB of gain (depending on cartridge output). Too much or too little gain can cause noise, distortion, or loss of dynamics.

If your amplifier’s built-in phono stage is high-quality and matches your cartridge type, this will be sufficient. However, external phono stages often outperform built-in phono stages due to better components, shielding, and adjustability.

Yes absolutely. Phono cables carry extremely low-level signals (especially from MC cartridges), so shielding, capacitance, and grounding can significantly affect noise and tone. Short, low-capacitance, well-shielded cables optimal for best audio playback.

The low output of MC cartridges requires a phono preamp with higher gain and lower input impedance, which MM-only preamps lack, making a compatible phono stage crucial for MC cartridges.

A power amplifier only amplifies the signal, it has no volume control, source selection, or tone controls. An integrated amplifier combines a preamplifier and power amp in a single chassis. If you already have a receiver or separate preamp, a power amp is what you'll need.

Power amplifiers are typically paired with a separate preamplifier, A/V preamp/processor or receiver. Power amplifiers typically have larger transformers and power supplies than an integrated amplifier or receiver and therefore will provide more power to large, demanding speakers to reach their full dynamic potential. A power amplifier is also a great choice to power a second stereo zone.

Power amplifiers have several different types of amplifiers classes. Class A provides the best overall sound quality however the least efficient and as a result will run hot. Class AB is the most common amplifier class which is a middle ground with great quality sound but more efficient, runs on the warm side. Class D is the most efficient class of amps, this runs the coolest and is an excellent option for lower impedance and lower sensitivity speakers.

Damping factor measures how quickly a speaker's cone and voice coil stop once an audio signal ends. A higher damping factor in a power amplifier (over 250) will result in tighter and cleaner bass response. Also, a high damping factor helps keep the speaker's frequency response flat, reducing unwanted dips and bumps.

Bridging combines two amplifier channels into one more powerful channel. A common example is bridging a stereo power amplifier into a higher power mono amplifier. Not all power amplifiers support bridging. If they do support it, the specifications of the bridged power output will be displayed. Since this method essentially doubles the wattage output, it is important to make sure the speakers can handle the increased load.

Both offer protection against voltage spikes, however a power conditioner also provides noise filtering - removing unwanted frequency interference, in some cases voltage regulation - keeping the voltage (120v) stable and preventing performance drops, and Component Isolation - which prevents the digital noise from connected components from leaking into equipment such as a preamplifier.

Yes absolutely, it can lower the noise floor which allows you to hear the finer musical details. In addition, this decrease in noise will produce a cleaner sound overall. Visually, a power conditioner can also reduce grainy video signals thus providing better video quality.

Many power conditioners will have high current outlets, these are best used with power hungry devices such as power amplifiers, subwoofers, and large A/V receivers. Using these will prevent their output from being restricted.

If you hear an audible hiss or hum especially when other appliances turn on, this is evident you have a considerable noise in your electrical lines and a power conditioner will aid in cleaning this. When sound quality is inconsistent it could be an indication that the voltage is not being properly regulated and a power conditioner with voltage regulation could help. 

The joule rating shows how much energy the power conditioner can absorb before failing. A higher joule rating is essential for protecting higher value components such as A/V Receivers, TVs, Amplifiers, Etc. A higher joule rating means the power conditioner can absorb more energy from a power surge before failing.

A passive sound bar will require an A/V receiver to power it, a active or powered sound bar will not require an amplifier or a/v receiver.

Wired soundbars will overall provide a higher quality sound with a more stable connection and no interference or delay which can occur with Bluetooth or wi-fi. Wireless sound bars are most convenient and provide flexibility with fewer cable connections needed.

The general rule of thumb is to match the length of the sound bar with the length of your TV. For a 40 inch tv, a soundbar closest to 40 inches would be best for example. 

Yes, the best connection would be to use HDMI either HDMI Arc or eARC which allows control from you TV remote. For sound bars that lack HDMI, you can connect to your TV using optical cable. Sound bars that have Bluetooth can also connect to TVs that are Bluetooth compatible.

Yes, some sound bars can reproduce surround sound virtually by essentially tricking our ears that a sound source is originating from somewhere it actually is not. Other sound bars that offer multi-channel surround sound will use what is referred to as True surround sound which include physical speakers that are able to reflect sound and create the separation needed for multi-channel surround sound. Some sound bars have actual rear powered speakers that communicate wirelessly with the soundbar to give a true surround sound.

A stereo preamplifier (or “preamp”) acts as the control center for your audio system. It takes multiple line-level sources such as DACs, CD players, and streamers and allows you to switch inputs and control volume, tone, etc. A preamplifier sends a clean, buffered signal to your power amplifier. It doesn’t amplify to speaker level but it provides voltage gain and signal management. 

Absolutely. The circuit design in a preamp, its power supply and selected internal components volume control all affect the tonal character, transparency, and audio dynamics. A preamplifier of high quality will result in more natural and lively audio refined, lively sound while an inferior preamp can sound flat, lacking variation in pitch and dynamic range.

Both a preamplifier and power amplifier greatly matter. However, to achieve the best quality sound, you must start with the best signal. This is why the preamp is absolutely the heart of the system. No matter what power amplifier is used, it's important to note that starting with the best possible signal will help determine will not change how clean, transparent and musically engaging the sound signature is.

Yes if your preamp has a “Phono” input or you’re using a separate phono preamp.

Many sources can be connected to a preamplifier such as: Turntables (via phono input or through an external phono preamp), CD players, Streamers or DACs, and TVs or media players.

Some preamplifiers will have both RCA (unbalanced) and XLR (balanced) connections. XLR connections help lower the noise floor and interference and are especially useful for long cable runs or connecting many devices. If both your power amplifier and preamplifier have XLR connections, it's always best to connect them via XLR cable for best performance. 

If the stereo receiver has HDMI output, use an HDMI cable. Connect the TV’s HDMI ARC/eARC port to the receiver’s HDMI OUT (ARC/eARC). This allows both video output and audio return from the TV. If equipped with a Digital Optical input/output, you can also use this to send audio from the TV to the Receiver.

If the stereo receiver has HDMI output, use an HDMI cable. Connect the TV’s HDMI ARC/eARC port to the receiver’s HDMI OUT (ARC/eARC). This allows both video output and audio return from the TV. If equipped with a Digital Optical input/output, you can also use this to send audio from the TV to the Receiver.

Yes, if the stereo receiver has a phono input. If not, you can connect an external phono preamp to the receivers line level input. Alternatively, a turntable with a built-in phono stage can also connect using the line level input.

You can connect a powered subwoofer using a single RCA cable from the receiver’s SUB OUT / LFE jack to the subwoofer’s LINE IN. If the stereo receiver has a single SUB OUT and you wish to connect 2 subwoofers, you can do so using a RCA Y-splitter adapter.

We recommend using banana connectors to connect to your stereo receiver if it has binding posts. This will provide a secure and reliable connection.

A subwoofer produces the lowest and deepest frequencies for a fuller dynamic range. In addition, it allows you to take stress off your speakers through utilizing a crossover setting.

Front-firing subwoofers are recommended for music for accurate and directed bass. Down-firing subs send sound waves through the floor which spreads the sound for a more immersive effect however with less clarity. This orientation is ideal for home theater applications. Rear-firing subs direct the sound backwards ideally towards a corner of a room which creates a tighter, more enhanced bass. With a rear-firing subwoofer, positioning is a factor to prevent unwanted vibrations.

For a large enough room, two subwoofers will solve any dead spots, resulting in a smoother, more consistent bass coverage throughout the room. The end result is a much larger "sweet spot".

A sealed subwoofer will have a flatter frequency response for tighter, more detailed bass that is smooth sounding and overall a more musical sound. A ported subwoofer provides higher output and overall more efficiency with a more louder, "boomier" type bass. Typically, ported subwoofer cabinets are larger to accommodate the bass ports. A sealed subwoofer is best for musical applications and also smaller rooms while a ported subwoofer excels with larger rooms and home theater applications. 

Yes, adding a subwoofer to a 2 channel system will remove strain from your speakers, especially bookshelf speakers which typically cannot achieve lower frequency levels. In addition, a subwoofer will improve the overall soundstage by adding depth and improved imaging. Connecting 2 subwoofers will further improve a stereo setup by increasing headroom for a more dynamic sound.

Yes, and it is the single most important upgrade you can make for sound quality. The cartridge (which contains the stylus) is responsible for reading the grooves, like a microphone for your records. Upgrading from a basic cartridge to a model with a better stylus shape (like an elliptical or micro-line) can dramatically increase clarity, detail, and dynamics. It is critical that your tonearm is compatible with the new cartridge - this is especially important for moving coil cartridges.

Tracking force is critical for sound quality and record longevity. This is the precise weight applied by the tonearm onto the stylus tip resting in the record groove. Setting it too high causes distortion and wears out your records and stylus prematurely. Setting it too low causes the stylus to "skate" or skip across the record, damaging the groove.

As the record spins, the friction between the stylus and the groove creates a natural inward force on the tonearm, pulling the stylus toward the center spindle. Anti-skate applies a subtle counter-force outwards to keep the stylus centered perfectly within the groove walls. The absence of anti-skate could likely lead to increased wear, distorted sound, and potential skipping.

On a manual turntable, you must physically lift the tonearm and place the stylus into the groove of the record. When the record finishes, you then must lift the tonearm and return it to it's resting position. While not as convenient as other automatic options, manual has the least moving parts that could induce unwanted vibration and noise. 
Semi-automatic involves the same manual lifting and lowering of the tonearm however when the record finishes, the tonearm will automatically lift and, in some cases, be returned. This will help protect your stylus and record from excessive wear.
Lastly, fully automatic turntables will lower the tonearm and drop the needle as well as return when the record is finished. This is the most convenient type of turntable however with the most internal moving parts. 

Dust and dirt are typically the culprit for skipping. Dust covers are highly recommended for when the turntable is not in use. Also, a carbon fiber brush or cleaning system is recommended on records and also a stylus brush to clean the stylus tips regularly. Another cause of skipping is the table not being level. Adjusting the feet of the turntable to achieve complete level is critical. Lastly, the incorrect tracking force can result in the stylus skipping to the outer edge of the record. If this is occurring, the tracking force needs to be increased.