Preamps, Preamplifier, Equalizer, switchbox, phono switchbox, record equalization
LM1036 Sports HiFi Power Amplifier Preamplifier Volume Tone Equalizer Control Board DIY KIT Home Bass Preamplifier Audio Module : Amazon.ca: Industrial & Scientific
High Low Level Impedance Adaptor - Car Audio System RCA Line Output Converter Adapter w/ Adjustable Level Control - Works on Vehicle Amplifier, Equalizer, Home Theater Setup - Legacy LN60 | Walmart Canada