JBL MPA1100 (1996)
The JBL MPA1100 is a professional two-channel power amplifier introduced in 1996. It belongs to JBL's MPA series, which also included the earlier MPA600. It inherits the technology of that smaller model, steps up the power, and was later replaced by the MPA1100E. People confuse it with the JBL MPX1100 often enough that it needs saying plainly: the MPA1100 and MPX1100 are different amplifiers.
The amp uses JBL's "CompactClass" high-current topology. That is how it delivers serious output from a chassis only 88mm tall - 2U in rack terms. The front panel is detachable, which made installation and service easier in fixed rack setups. Around back are both RCA and XLR inputs plus 5-way binding post outputs, a sensible mix for a pro amp of this era.
The record on exact output figures has a small discrepancy. The most commonly cited numbers are 2 × 110W RMS at 4 ohms and 2 × 75W RMS at 8 ohms, though at least one source lists it as 80W per channel. The rest of the electrical spec is consistent across sources: frequency response of 20 Hz to 20 kHz ±0.5 dB, THD of 0.03%, signal-to-noise ratio of 100 dB, input impedance of 10 kOhm, input sensitivity of 0.77V, and a damping factor of 100. Dimensions are 483 × 88 × 288 mm and it weighs 9.4 kg.
Mix magazine (May 1996, p.156) noted the soft-start circuit, front-panel LEDs for signal present and peak, plus power and bridge mode indicators, XLR and ¼-inch inputs, and binding post outputs — and listed a suggested retail of $1,990.
A used unit in good condition has been seen listed around $300 on Reverb. No common failure modes or repair issues are documented in the sources reviewed.
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