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JBL 4309 6.5-inch 2-way Bookshelf Loudspeaker Pair with JBL SA550 Integrated Amplifier Bundle

by JBL
UPC: 050036381901
Save 37%
Original price $3,999.00
Current price $2,499.99

SKU JBL4309BlackGrillsSA550
Color: Black Walnut with Black Grill and JBL SA550

Product Qualifies for FREE Ground Shipping

JBL 4309 6.5-inch 2-way Bookshelf Loudspeaker Pair with JBL SA550 Integrated Amplifier Bundle



1 PAIR JBL 4309 6.5" 2-Way Bookshelf Speakers Black Walnut with Black Grills

1 JBL SA550 Bluetooth Integrated Amplifier

JBL 4309

The JBL 4309 Studio Monitor is a compact, high-performance bookshelf loudspeaker built around the patented JBL 2410H-2 1-inch compression driver mated to patented High-Definition Imaging (HDI™) horn, paired with a 6.5-inch, cast-frame Pure-pulp cone woofer. This combination delivers music with authority and accuracy not possible with traditional loudspeaker designs. The cabinet features a classic JBL studio monitor design with a blue baffle and is finished in a choice of Walnut or Black Walnut furniture-grade satin wood veneers.

4309 Highlights

  • Patented High-Definition Imaging (HDI™) horn
  • Patented 2410H-2 1-inch (25mm) high-frequency compression driver
  • 6.5-inch (165mm) cast frame, Pure-pulp cone woofer with 1.5-inch voice coil
  • Classic Studio Monitor design with premium finishes including satin Walnut wood veneer with blue grille or satin Black Walnut wood veneer with black grille

Designed and engineered in JBL’s world-famous acoustic engineering facility in Northridge, California, the 4309 Studio Monitor is a showcase of patented JBL acoustics technologies. This bookshelf loudspeaker features a 2-way design with patented High-Definition Imaging (HDI™) horn technology, the patented 2410H-2 1-inch (25mm) compression driver, and a 6.5-inch (165mm) cast-frame, Pure-pulp cone woofer for powerful dynamics and incredibly accurate sound reproduction.

JBL’s revolutionary High-Definition Imaging horn geometry is the result of intense research into the nuances of horn design. In search of exceptional high-frequency detail and uniform directivity for smooth in-room response, JBL engineers pioneered a design that delivers neutral frequency response both on- and off-axis and provides a seamless transition between the high and low frequency drivers.

The JBL 2410H-2 compression driver benefits from the advanced research and applications derived from JBL Professional’s “D2” range of transducers. At the core of the 2410H-2 device is a lightweight polymer, annular diaphragm that improve high-frequency extension by reducing diaphragm mass. The V-shaped geometry of the annular diaphragm reduces breakup modes, eliminating time smear and reducing distortion. The result is incredible dynamics with accurate reproduction and a lack of power compression.

An Ultra High-frequency tonal adjuster is located on the front panel below the horn and allows the sound to be tailored to the specific environment and listener preference. This control works in conjunction with an advanced crossover network design that features air-core inductors, cast wire-wound resistors and low-ESR metallized film capacitors to optimize the performance of the 4309 drive components.

The 4309’s powerful 6.5-inch (165mm) woofer takes advantage of core JBL engineering techniques to ensure very high output with low distortion. The long-throw voice coil in conjunction with the symmetrical field motor design, flux stabilization ring, and copper shorting ring guarantee maximum output with low distortion. A Pure-pulp cone provides a lightweight, rigid diaphragm and helps to eliminate breakup modes ensuring proper pistonic motion throughout the operating band.

The 4309 enclosure is heavily braced with 3/4-inch (18mm) thick walls to provide a solid acoustic foundation and incorporates a bass reflex design with dual front-firing, computer-optimized flared ports. The cabinet features a classic JBL studio monitor design with a blue baffle and is finished in a choice of Walnut or Black Walnut furniture-grade satin wood veneers. A blue (Walnut) or black (Black Walnut) cloth grille completes the elegant appearance. Dual sets of gold-plated binding posts provide a secure connection and offer a choice of single-ended or bi-wire/bi-amplified connections.


The JBL SA550 Classic is inspired by the classic JBL SA600 amplifier from the 1960’s, with retro styling and walnut veneer side panels to match JBL Classic and Studio Monitor loudspeakers on the outside.

On the inside, the JBL SA550 is a music system for today with an advanced amplifier topology with high power output, inventive efficiency, and fine noise control for captivating musicality and effortless power.

Straight out of the box, pair your smart phone or tablet to the SA550 with Bluetooth for instant high performance music from all your music services and libraries that you listen to everyday. The JBL SA550 Classic includes the latest Bluetooth AptX®Adaptive technology for hi-res audio over Bluetooth and low latency to ensure audio is in sync with video.

The advanced amplifier topolgy in the JBL SA550 Classic is called Class G. Class G utilizes multiple power supplies where all other amplifiers only use one. The first power supply feeds enough power for the amplifier to deliver 10 Watts per channel, not a lot you might think... but this small amplifier includes a big heatsink that keeps the amplifier stable up to 90 Watts per channel. That enables this first 10 Watts to be delivered in a topology known as Class A, which ordinarily is not very efficient. The benefit is that it involves no switching of any output stage components in and out of the music signal - as normally occurs in any Class AB or Class D amplifier. The result is vanishingly low noise and the purest sound with all micro dynamics and details preserved. Of course, 10 Watts really isn’t much and so the SA550 can deliver a great deal more. It can deliver a maximum sustained output of 150 Watts per channel with the use of a second, much higher voltage power supply, and this is where the amplification in the SA550 is incredibly inventive. If that second power supply was simply switched into circuit when required, it would induce nasty distortion, and this would be harmonic too - quite unpleasant. So the SA550 includes a set of high speed “lifters” which gradually raise the
power delivered to the amplifier, tracking the music signal and maintaining a 5 Volt head room. This allows the benefits of Class G amplification to be realizes, whilst eliminating the downsides and powering any speaker system effortlessly. All that smart amplification can be enjoyed from three digital and four analog inputs, including a moving magnet phono input for a turntable. The digital inputs include a high resolution, ultra high-fidelity DAC with the highest performance ESS DAC chip at heart. The SA550 is a throw-back to the late 1960’s on the outside. But with Hi-res Bluetooth technology, efficient amplification and exceptional musical performance, the SA550 is a modern classic rooted in today’s best technologies.


    JBL 4309 Specifications:

    Type 2-way bookshelf loudspeaker
    Low Frequency Driver 6.5" (165mm) Pure Pulp cone woofer
    High Frequency Driver 2410H-2 1-inch (25mm) annular ring, Teonex® diaphragm compression driver with advanced HDI™ geometry horn
    Recommended Amplifier Power 25 - 150 WRMS
    Impedance 4 Ohm
    Loudspeaker Sensitivity 87 dB/2.83V/1m
    Frequency Response 42 Hz - 30 kHz (-6 dB)
    Coverage Angle, -6 dB 100 Degrees Hor. x 80 Degrees Ver., from 2kHz to 17kHz
    Crossover Frequency 1.6 kHz
    Enclosure Type H-braced front-ported bookshelf
    Grille Feature Monitor style to match horn mating features, supplied in dark blue (with walnut cabinet) and black (with black cabinet)
    Dimensions with grille 16.5” H x 10.25” W x 9” D (419 mm H x 260 mm W x 227 mm D)
    Controls UHF tone control
    Input Type Dual sets of gold-plated binding posts with shorting straps
    Product Weight (Each) 24.2 lbs. (10.98 kg)
    Shipping Weight 56.2 lbs. (25.5 kg)
    Shipping Units of Measure Pair
    Warranty 5 Years
    Recommended stand height 24” (609 mm)

    JBL SA550 Specifications:

    General Specifications:
    Continous power output both channels driven (0.5% THD):
    • 90W into 8Ω x2
    • 150W into 4Ω x2
    • Harmonic distortion, 80% power, 8Ω at 1kHz: 0.002%
    Phono moving magnet input:
    • Input sensitivity at 1kHz: 5mV
    • Input impedance: 47kΩ + 100pF
    • Frequency response (ref. RIAA curve): 20Hz - 20kHz ±1dB
    • Signal/Noise ratio (A-wtd) 50W, ref. 5mV input: 80dB
    • Overload margin, ref. 5mV at 1kHz
    Line inputs:
    • Nominal sensitivity: 1V
    • Input impedance: 10kΩ
    • Maximum input: 6Vrms
    • Frequency response: 20Hz - 20kHz ±0.2dB
    • Signal/Noise ratio (A-wtd) 50W, ref. 1V input: 106dB
    Digital inputs:
    • Supported Bit depth: 16 bit - 24 bit
    • Supported sample rates (Optical)(kHz): 32, 44.1, 48, 88.2, 96
    • Supported sample rates (Coaxial)(kHz): 32, 44.1, 48, 88.2, 96, 176.4, 192
    • Frequency response: 20Hz - 20kHz ±0.05dB
    • Signal/Noise ratio (A-wtd) 50W, ref. 1V input: 115dB
    Mains Voltage: 110–120V or 220–240V, 50–60Hz
    Maximum Power Consumption: 500W
    Width (inches)    17-3/4
    Height (inches)    4-15/16
    Depth (inches)    13-5/8
    Product Weight: 12kg, 24.69 lbs
    Shipping Weight: 14kg, 30.86 lbs
    Warranty: 5 Years