The Pultec EQP-500X is a 500 series adaptation of the classic EQP-1A Passive EQ, mixing the best attributes of the EQP-1A3-SS and EQP-1S3-SS.
The Pultec EQP-500X uses an op-amp based on the API 2520 replacing the valves found the original EQP-1A. The API inspired op-amp provides a cleaner and more transparent tone without sacrificing the depth and musicality Pultec EQs are known for.
A mixture of the EQP-1A3-SS and EQP-1S3-SS, the EQP-500X features a unique blend of frequencies with an increased amount of high peak boost frequencies (1kHz, 2kHz, 3kHz, 4kHz, 5kHz, 8kHz, 10kHz, 12kHz and 16kHz). It further includes two shelving boost frequencies of 5kHZ and 10kHz. High attenuation frequencies include the classic 5kHz, 10kHz and 20kHz.
The Low band offers the same frequency choice as on the EQP-1S3-SS (30Hz, 40Hz, 70Hz, 100Hz)
Pultec EQP-500X Main Features:
Single-channel, 2-band equalizer built to 500 Series specifications
The vintage character of original Pultecs, the reliability of modern design
Incredibly low noise floor for a pure sound
Bandwidth control lets you decide how wide a range you’re sculpting
Separate boost and cut controls provide additional creative potential
30, 40, 70, 100Hz shelf boost, 0-13.5dB
30, 40, 70, 100Hz shelf attenuate, 0-17.5dB
1, 2, 3, 4, 5, 8, 10, 12, 16 KCS peak boost, 0 – 18 dB
5, 10 KCS shelf boost, 0 – 14 dB
5, 10, 20 KCS shelf attenuate, 0 – 16 dB
Amplifier: 20Hz-20kHz; +0, -1dB (ref: 1kHz, including input/output transformers)
Input transformer: 600 ohms; output transformer: 600 ohms
Noise: below -80dBm; output level:+21dBm maximum
Distortion: 0.15% at 10dBm into 600 ohms