Boss Audio Bx55 2/3 Way Pre-amp Car Electronic Crossover with Remote Subwoofer Control Maximum Input Voltage 4.5 Volts Maximum Output Voltage 9 Volts, S/N Ratio 110 Db, THD 0.010 Variable Bass Boost

BOSS Audio MC470B All-Terrain Bluetooth Speaker and Amplifier System - 1000 Watt, Chrome

BOSS Audio MCBK470B All-Terrain Bluetooth Speaker and Amplifier System - 1000 Watt, Black

BOSS Audio Systems R1100M Riot Series Car Audio Subwoofer Amplifier - 1100 High Output, Monoblock, Class A/B, 2/4 Ohm Stable, Low/High Level Inputs, Low Pass Crossover, Mosfet Power Supply, Stereo

Boss Audio Bx45 2/3 Way Pre-amp Car Electronic Crossover Remote Subwoofer Control Variable High Pass Filter 40 Hz – 8 Khz Selectable Crossover Slopes, Selectable Phase Maximum Input Voltage 4.5 Volts

Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control

BOSS Audio Systems R3400D Class D Car Amplifier - 3400 High Output, 1 Ohm Stable, Digital, Monoblock, Mosfet Power Supply, Great for Subwoofers

BOSS AUDIO AR4000D Armor 4000-Watt Monoblock, Class D 1-8 Ohm Stable Monoblock Amplifier with Remote Subwoofer Level Control

BOSS Audio EQ1208 4 Band Pre-Amp Equalizer with Remote Subwoofer Level Control