JBL 4745A (c. 1992)
The JBL 4745A is professional sub-bass reinforcement from JBL's "Sound Power" series. It is a 1-way, 2-speaker, bass reflex floor-standing enclosure built around a pair of 38 cm (15") 2226H woofers. It was designed for discos, clubs, and any space where high sound pressure levels matter more than subtlety. The Japanese-market price reference puts a single unit at ¥300,000 around 1992, which is about as close to a production date as the record gets.
The numbers are genuinely imposing. The 4745A is rated at 103 dB output sensitivity (2.83V/m), with a maximum output of 131 dB, and handles 1,200W AES (50 Hz–500 Hz) into a 4-ohm load. Frequency response is given as 32 Hz to 2.2 kHz at −10 dB, with the crossover region intended to sit between 80 Hz and 150 Hz depending on the installation — a 25 Hz low-cut is built in, and the maximum usable crossover frequency is 800 Hz. It uses Neutrik NL8MPR Speakon connectors (two of them) for input and output, which tells you JBL expected these to be daisy-chained in real installations, not parked in a living room.
In practice, the 4745A was typically paired with the JBL 4756A in a 4-way active system, with the crossover card (53-5334) in the JBL 5235 active crossover handling the split. Forum chatter from owners who've actually run them is positive — one user reported running a 4745A on the 100 Hz–350 Hz band alongside Void 18" subs and said it worked "very well." The cabinet itself is substantial: 850 mm wide, 800 mm high, 530 mm deep, and 65 kg. That's a lot of box, and it's built to move air, not furniture.
The record is thin in places. There are no production years beyond that 1992 price reference, no official full-range frequency response spec, no THD or S/N figures, and no documented common failures or maintenance notes. The market today is mostly secondhand listings and the occasional chassis plate on eBay. The drivers themselves (2226H) are well-regarded and still find use in DIY builds, with at least one forum member building four subwoofers around the 4745A enclosure design and 2226H drivers. If you're looking at a pair, check the condition of the 2226H woofers first.
- Type: 1-way, 2-speaker, bass reflex, floor-standing
- Drivers: 2 × 38 cm (15") JBL 2226H cone woofers
- Frequency response: 32 Hz – 2.2 kHz (−10 dB)
- Sensitivity: 103 dB / 2.83V/m
- Max output: 131 dB
- Power handling: 1,200W AES (50 Hz – 500 Hz)
- Impedance: 4 Ω
- Crossover: 80–150 Hz (25 Hz low cut; max 800 Hz)
- Connectors: Neutrik NL8MPR ×2
- Dimensions: 850W × 800H × 530D mm
- Weight: 65 kg
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