Low and High pass filter LA-10. Adjustable from 50 Hz to 50 kHz in 10 steps
Nobsound G2 Subwoofer / Full-Frequency Mono Channel Digital Power Amplifier 100W - Walmart.com
Nobsound G2 Subwoofer / Full-Frequency Mono Channel Digital Power Amplifier 100W - Walmart.com
Nobsound E6 Direct Heated Vacuum Tube Class A Stereo Audio Pre-Amplifier Gift | eBay
Amazon.com: Low Pass Subwoofer Filter DC 12V Single Power Supply Heavy Preamp HiFi Pre-Circuit Non-Amplifier Sound Box : Electronics
Amazon.com: Low Pass Subwoofer Filter DC 12V Single Power Supply Heavy Preamp HiFi Pre-Circuit Non-Amplifier Sound Box : Electronics
Amazon.com: Preamp Board 2.1 Channel Low Pass Filter Subwoofer Independent Interfaces for Full Frequency and Bass Output Tone Board HI FI Circuit Board DC 12-30V / AC 9-20V : Electronics