The
JBL MA758AM (also marketed as the
JBL Marine A758) is a
high-performance 8-channel Class D marine audio amplifier. It is built specifically to drive extensive multi-speaker layouts across a vessel or large off-road vehicle from a single, low-profile chassis.
To survive harsh marine environments, the amp features conformal-coated circuit boards and corrosion-resistant stainless steel connections that shield internal electronics from moisture, high humidity, and open-water salt spray. It features a removable snap-in top panel and trim ring to protect its tuning controls from direct water splashing. It also features balanced differential inputs to completely block electrical and engine noise from distorting your music stream.
⚙️ Technical Description
The architecture leverages high-efficiency Class D technology to output a total of 1000 Watts RMS while drawing minimal current from the boat's 12V battery system.
1. Advanced Input Mode Switching
To simplify complex marine wiring, the amp utilizes an intelligent hardware matrix switch that splits signals without external RCA splitters:
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2-Channel Mode: Splits a single Left/Right RCA input pair evenly across all 8 output channels.
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4-Channel Mode: Splits 4 inputs across the 8 channels (Inputs 1/2 drive outputs 1–4; Inputs 5/6 drive outputs 5–8).
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8-Channel Mode: Provides true discrete audio routing, where each unique input maps strictly to its matching output channel.
2. Electrical Power Output Configurations
The amplifier is 2-ohm stable in standard mode and 4-ohm stable when bridged, allowing for high application flexibility:
| Configuration / Load
|
Power Output Rating (at 14.4V)
|
|
Per Channel @ 4 Ohms
|
75 Watts RMS x 8
|
|
Per Channel @ 2 Ohms
|
125 Watts RMS x 8
|
|
Bridged Mode @ 4 Ohms
|
250 Watts RMS x 4
|
|
Total Continuous System Power
|
1,000 Watts RMS Total
|
3. Tuning & Protection Metrics
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Signal Filters: Independent, variable high-pass and low-pass crossovers (32Hz – 320Hz) featuring a 12 dB/octave roll-off slope.
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Input Sensitivity Range: Accepts low-level RCA signals from 200mV to 5V, and high-level speaker wire inputs from 1V to 25V (includes 8 bare-wire-to-RCA adapters).
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Onboard Safety Protection: Circuitry actively monitors and isolates thermal overloads, under-voltage (<8.5V), over-voltage (>16V), short circuits, and DC offset output.
- Fusing & Core Dimensions: Employs three 35A ATO blade fuses (105A total rating). Measures 14-3/16” Wide x 2-1/16” High x 7-1/8” Deep
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