Based on Pultec EQP1a

Extended high frequency range. 1K, 1,5K, 2K, 3K, 4K, 5K, 8K, 10K, 12K, 14K, 16K

Extended low frequency range. 20Hz, 30Hz, 60Hz, 100Hz, 150Hz

Transformer balanced output

Designed around vintage 1731 opamp

Handwound inductor

All switched rotary controls

Goldplated PCB internals

Real hardware bypass

Compatible with 500 series racks