API 525A 500 Series Compressor/Limiter Processor 500 Series Compressor/Limiter With Adjustable Attack Time, Switchable Release Modes, Variable

API 500-6B 6-Slot 500 Series Lunchbox Processor 6-Slot Empty Chassis For API 500 Series Modules With Built-In Power Supply

Pultec MEQ-500 500 Series Parametric Equalizer - Jack Douglas Edition Processor 1-Channel, 3-Band Solid-State 500 Series Midrange Equalizer With

Golden Age Project Comp-554 MK2 500 Series Compressor Processor 1-Channel 500 Series Compressor With Stepped Controls, Sidechain Filter,

BAE 500C 500 Series FET Compressor Processor 500 Series FET Compressor With Input, Output, Attack, And Release Controls Six Compression Ratios, And

Fender Rumble 500 2 X 10-Inch 500-Watt Bass Combo Amp 2 X 10" 500-Watt Bass Combo With 4-Band EQ, Three Voicing Options, XLR Direct Out, And

API 527A 500 Series Compressor/Limiter Processor 500 Series 1-Channel Compressor/Limiter Module

API 500-8 8-Slot 500 Series Lunchbox Processor 8-Slot 500 Series Rack With DB-25 Connectivity, Phantom Power, And Linkable Channels

Lindell Audio 6X-500 500 Series Microphone Preamp & EQ Processor 500 Series Mic Preamp/Equalizer With Single-Channel Transformer-Coupled Mic Preamp