The Single-Channel Vintage Edition Transformer-Coupled Passive Pultec Equalizer from Lindell Audio fits in all 500-series compatible racks. Like the classic EQs it was modeled after, the PEX-500VIN features all discrete circuitry, including transformer-coupled balanced inputs and outputs. A series of 3-step switches provide hassle-free control over your low- and high-frequency EQ bands plus the cut-off frequency for high-frequency attenuation.