Make your 500 Series rack ready for serious tone with the Lindell Audio PeQ-501a, a single-channel Retro 500 Series 2-band equalizer based upon the legendary Pultec EQP-1A. Thanks to the vintage-style 1731 op-amp, a handwound inductor, and the transformer-balanced output, you can impart smooth highs and substantial lows on anything from bass and drums to vocals and synths. With all rotary controls stepped for easy recall, the PeQ-501a is well suited for mastering as well as recording and mixing. The high- and low-frequency bands feature extended frequency ranges and support simultaneous boost and cut via independent controls. A dedicated toggle switch is provided for true hardware bypass. The gold-plated PCB enhances conductivity and resists corrosion. The PeQ-501a occupies two slots in any 500 Series power supply (required and available separately).