4 gold plated RCA's (2 RCA input & 2 RCA output). Can adjust the amplifier gain while driving. Two ways of regulation Tone-up regulation. Frequency regulation. Perfect for balancing the system to change music styles.
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6x9 Inch Car Audio RMS150w Car Subwoofer with Amplifier Subwoofer Under The Seat Car Subwoofer Body Module Amplified Woofer
Aliexpress UK
TheEQX7PRO pushes your system past its limits by strengthening its signal and clearing distortion! Order the EQX7PRO to fine-adjust your amplifier's DB ranges with precision, bringing out the exact loudness level exactly where you want it!
eBay
10 Inch Tunnel Car Audio Subwoofer Car Speaker Sound System Car Subwoofer with Amplifier Subwoofer Drive The Rhythm of The Music
Aliexpress UK
PRV Audio's EX4.6 PRO electronic crossover gives you tons of flexibility to make it easy to tune your car audio system for optimum sound. To get maximum power and impact from your system the EX4.6 PRO also includes an 0-12 dB bass boost at 45 Hz on the subwoofer output.
eBay
8 Inch Car Audio System 450W Audio Amplification DC12V Powered Subwoofer Car Speaker & Subwoofer Car Amplifier Subwoofer
Aliexpress UK
RCA Front/Full Range Stereo or Optional Mixed Mono InputOptional 1800 Phase Inversion Switch for Front/Full Range InputOptional 2Ch. RCA or Front/Full Range Input for Low/Subwoofer Input2Ch. RCA Full Range Output w/ Mute Switch & Variable 9V Line Driver2Ch.
eBay
15inch Car Active Subwoofer 12V 300W Car Spare Tire Subwoofer 9" Woofer Speaker With Heat Disspassion Port
Aliexpress UK
Change the frequency to apply more speakers. The old crossovers are rigid. If they are not suitable for users, they cannot be changed after they are installed. And the cost is higher. Capping power: 200W.
eBay
DSP Bluetooth module 5.0 power amplifier board module electronic crossover hifi sound quality TWS paired subwoofer 2.0/1.1
Aliexpress UK
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eBay
AINAVI 800W 10 Inch Subwoofer Car Audio Slim Under Seat Active Subwoofer Bass Speaker Car Aluminum Alloy Subwoofers Woofer 12V
Aliexpress UK
Car Amplifier Equalizers Audio Gian Level Bass Boost Subwoofer. It is manufactured with premium material for and lasting use. - Strict quality inspectation system insures you premium product and safe usage.
eBay
1pc Subwoofer Speaker 12 Inch MAX1800w High Power Car Audio System Amplified Car Subwoofer Pure Subwoofer Body DC12v Speaker
Aliexpress UK
High-Pass Crossover Frequency Multiplier. 3-way Elec Crossover. 6/4/2 Channel RCA Inputs.
eBay
600W 8 Inch Wood Texture Subwoofer Car Audio With treble Slim Under Seat Active Subwoofer Bass Speaker Car Subwoofers Woofer 12V
Aliexpress UK