JBL Project K2 S7500 (1991)
The JBL Project K2 S7500 is a floor-standing, two-way bass-reflex loudspeaker released in 1991. The Japanese list price was ¥1,700,000 for the black or gunmetal gray finishes, and ¥1,850,000 for gunmetal metallic or white washed maple. It was the larger sibling of the K2 S5500, and part of JBL's Project K2 line - a series that spanned roughly 35 years and included a studio monitor variant.
The S7500 uses the same modular approach as JBL's flagship S9500. Each speaker stacks three modules - a B95 base module, a 3000M low-frequency module, and a 4500M high-frequency module - joined by a 75M top plate. The modules lock together at pinpoint contact points, using four pairs of metal pin disks and a point base. The 4500M is also secured by a stainless steel rod passing through the module. The B95 pedestal alone weighs about 45 kg. The complete speaker weighs 124 kg.
The low-frequency module holds a 36 cm (14-inch) 1400Nd cone woofer in a roughly 57-liter ported enclosure. The woofer's neodymium magnet circuit uses a bent-gap cooling method. Three through-holes run from the gap to the rear of the unit, and the cone's own motion forces cooling air across the voice coil. Airflow increases automatically at large amplitudes. The high-frequency module pairs a 475Nd compression driver with a biradial horn cut off around 500 Hz, radiating 60° horizontal by 40° vertical. The driver is a home-use refinement of the professional 2450J, with an internal-magnet circuit and a flat Aqua Plus-coated dome diaphragm. The horn's upper and lower sections are machined from solid transparent acrylic. The side plates are mirror-finished anodized aluminum over MDF.
The crossover sits in the 3000M module at 650 Hz (-12 dB/octave). Both the high-pass and low-pass channels are on board, so the 4500M connects through the 3000M. Rear-panel controls include a High Frequency Trim switch (stepped ±1 dB above 650 Hz) and a High Frequency Contour switch (attenuating above 5 kHz). A bypass switch disconnects the internal network for multi-amplified setups with an electronic crossover. Bi-wiring is supported. Internal wiring is Monster Cable.
Frequency response is rated 35 Hz to 21 kHz (-6 dB), sensitivity 91 dB/2.83V/m, nominal impedance 6 ohms, and maximum input 300W (IEC shaped noise). The 475Nd driver alone is rated 500 Hz to 21 kHz at 107 dB/2.83V/m with its horn. The 1400Nd woofer covers 20 Hz to 2 kHz at 92 dB/2.83V/m.
Japanese used-audio dealers list the S7500 among their high-value trade-in JBL models, and enthusiast accounts describe it as a long-coveted acquisition. One French forum user asked which amplifier best drives the K2 S7500. No professional period reviews have surfaced in the available record, so the S7500's reputation rests largely on owner testimony and its place in JBL's K2 lineage.
Known Specifications
- Type: 2-way, 2-speaker, bass-reflex floor-standing system
- Frequency response: 35 Hz – 21 kHz (-6 dB)
- Sensitivity: 91 dB / 2.83V/m
- Nominal impedance: 6 ohms
- Maximum input: 300W (IEC shaped noise)
- Crossover: 650 Hz (-12 dB/octave)
- Dimensions: 590 W × 940 H × 500 D mm
- Weight: 124 kg
- Low-frequency driver: 1400Nd, 36 cm cone (neodymium magnet, bent-gap cooling)
- High-frequency driver: 475Nd compression driver on biradial horn (2-inch throat, 60°H × 40°V)
- Finishes: black, gray, gunmetallic, white washed maple
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