Used massive audio N4 bass mono block amplifier. It was working when removed from the car. Please google search specs. I believe this is 4000watts max. Please check other viewings.
eBay
New Digital Single-channel Class D Power Amplifier Mono RMS650w Strong Power 1~4Ω Car Audio Upgrade Subwoofer Amplifier
Aliexpress UK
PIONEER GM-D9701 1 CHANNEL CAR AMPLIFIER. An amplifier shouldn’t take up too much space, especially in your car. It combines a 1-Ohm stable circuit, installation flexibility and a superior high-power output.
eBay
Woopker 600W Amplifier Board 12V Car Audio Power Amplifier Board Lossless Subwoofer Bass Module High Power 4 Ohm Mono Channel
Aliexpress UK
PIONEER GM-A3702 2-CHANNEL CAR AMPLIFIER - BRIDGEABLE MONO. Maximum power input 500W (Bridged) or 2 x 170W (4 Ω) or 2 x 250 W (2 Ω). 2-8 ohm allowable (Stereo) Load impedance capability. CEA 2006 Power 2 x 60W (4 Ω).
eBay
1000W IRS2092 Mono Channel HiFi Sound Power Amplifier Board Audio Amp ±50V-±80V for 4-8ohm Car Karaoke Home Theater Subwoofer
Aliexpress UK
330 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms). Mono subwoofer car amplifier. Class D Stereo Amplifier XM-GS100. Class-D amplifier design. Than a Decade. XM-GS1 Amplifier. variable low-pass filter (50-300 Hz, 12 dB/octave).
eBay
Car DIY audio modification high-power DC12v power amplifier board lossless subwoofer bass module audio amplifier mono
Aliexpress UK
Pioneer GM-D9701 Class D Monoblock Car Audio Bass 2400W Amplifier. An amplifier shouldn’t take up too much space, especially in your car. It combines a 1-Ohm stable circuit, installation flexibility and a superior high-power output.
eBay
AIYIMA A3001 TPA3255 Subwoofer Power Speaker Amplifier 300W Mono Hifi Home Audio Amplifier NE5532 OP AMP Bass Treble Adjust
Aliexpress UK
Power Output 1x500W RMS @ 1 Ohm Load. Bassface - In the end all it is about the performance. Power Output 1x280W RMS @ 2 Ohm Load. Power Output 1x210W RMS @ 4 Ohm Load. Class D Technology - Maximum Power Mono Subwoofer Amplifier.
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AIYIMA 1000W Power Amplifier HIFI Sound Amplifier Speaker Amplify Mono Digital Sound Amplifier Audio Amp Home Theater
Aliexpress UK
VIBE POWERBOX1200.1D-V3 Vibe 1200w mono amplifier. POWERBOX MONO AMPLIFIERS. COMPACT DESIGN - The high efficiency class D technology allows us to keep a com-pact design and follow our signature Black and red signature.
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4*100W High Power Output Car Power Amplifier 4 Channel Class AB Car Amplifier Car Audio Stereo Sound Amplifier Car Modification
Aliexpress UK
2000 Watts Monoblock Amplifier - EDGE EDB1000.1-E9 Car Audio Amplifier 1000W RMS. The new updated EDGE EDB1000.1D-E4 Car Audio Amplifier 1000W RMS - 2000 Watts Monoblock Amplifier. RMS @ 1 Ohms: 1 x 1000w.
eBay
HiFi Car Power Amplifier 2*100W 2 Channel Car Audio Amplifier 12V Car Audio Stereo Digital Audio Adjustable Car Sound Amplifier
Aliexpress UK