JBL SR6630 (Years Unknown)
The SR6630 is a rack-mounting two-channel power amplifier from the JBL/UREI era of JBL's professional line. It belongs to the same "SR" family that supplied installers and touring rigs with utility power. The surviving manual is marked "JBL/UREI SR6630 REVA," which puts it in the period when UREI was folded into JBL's pro division. The document itself is undated, and no production years are recorded here.
The spec sheet describes a fairly serious amp. Rated output is 300 W per channel into 4 ohms, 190 W into 8 ohms, or 600 W in 8-ohm bridge mode (380 W in 16-ohm bridge). JBL rated it as minimum continuous sine wave output with both channels driven across 20 Hz-20 kHz, with THD and IM under 0.1% from 250 mW to full rated power, and transient intermodulation distortion under 0.05%. Midband (onset-of-clipping, 1 kHz, 1% THD) is quoted at 500 W into 2 ohms, 330 W into 4, and 200 W into 8. Frequency response is +0/-1 dB from 20 Hz to 20 kHz.
The input stage is a balanced bridging differential amplifier, 40 kΩ balanced or 20 kΩ single-ended. Sensitivity is 1.1 V for rated output into 8 ohms, and maximum input level is +20 dB (7.75 V rms). Damping factor is specified as greater than 200 from 20 Hz to 1 kHz into 8 ohms. Noise sits at least 100 dB below rated output (15.7 kHz noise bandwidth). The amp draws about 60 W at idle and 1200 W at rated output into 4 ohms, both channels. It is fan-cooled, with airflow running back-to-front.
It's a 3.5-inch (2U) rack unit, 368 mm deep to the rear panel and 406 mm to the back of the rack ears. Inputs are XLR and 3-conductor phone jacks in parallel. Outputs are five-way binding posts on 19 mm centers. The front panel carries the power switch, stepped input level controls, rack handles, and LEDs for power, signal present (×2), clip (×2), and protect. The rear panel has the ground-lift switch and the stereo/dual, mono/bridge, mono mode switch. The parts list confirms a 120 V toroidal transformer, a 15 A circuit breaker, and a mix of NE5532/NE5534 op-amps with 2SA/2SC output devices. Net weight is listed as "to be determined" - the manual never filled that in.
Period coverage is essentially absent. The magazine database's hits for this model are noise: unrelated installation news and OCR-damaged fragments, none of them actual SR6630 reviews. There's no contemporary price, no measured third-party bench test, and no reception history to report.
- Type: two-channel rack-mount power amplifier (JBL/UREI professional line)
- Rated power: 300 W/ch @ 4 Ω · 190 W/ch @ 8 Ω · 600 W @ 8 Ω bridge · 380 W @ 16 Ω bridge
- Bandwidth: 20 Hz–20 kHz, +0/−1 dB
- THD/IM: <0.1% (250 mW to rated power); TID <0.05%
- Input: balanced bridging differential, 40 kΩ bal / 20 kΩ unbal; 1.1 V sensitivity @ 8 Ω
- Damping factor: >200 (20 Hz–1 kHz, 8 Ω)
- Noise: ≥100 dB below rated output
- Dimensions: 2U rack, 3.5 in. high; 368 mm deep to rear panel
- Cooling: fan, back-to-front airflow
- Weight: not specified in the manual
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