The EQP-200B from Summit Audio consists of two independent passive equalizers, inspired by the original Pultec program equalizer design.

The equalizer functions using 3 different sections, a low frequency attenuate and boost section, a high frequency boost section that has an adjustable bandwidth, and a high frequency attenuate section.

The equalizer has approximately a 20dB gain loss due to the nature of its design. This gain loss is overcome by a vacuum tube amplifier stage, with the equalizer circuit feeding the first stage of the amplifier. A second stage of the amplifier has a cathode follower for low output impedance, which in turn drives the discrete 990 output stage.

The tubes are operated class A with negative feedback. The power supply is all solid state and regulated. The tube heaters are D.C. operated. The unit is a hybrid processor that uses solid state technology to provide the sweet, open high end of discrete solid state devices, while the vacuum tube amplifier delivers tube "warmth" and provides the gain to overcome the inherent loss when cutting frequencies.

Filter Type Passive
Number of Channels 2
Inputs 2 x XLR
Outputs 2 x XLR
Maximum Input Level +23dB
Frequency Bands Low Band:
20, 30, 60, 100 and 180Hz
Mid-High Band:
1.5, 3, 5, 8, 10, 12 and 16kHz
High Band:
5, 10, 12.5 and 20Hz
Bandwidth Mid-high frequency variable, dependent on boost setting
Range (Boost/Cut) Variable
Maximum Output Level +23dB
Frequency Response 12Hz to 45kHz, -0.5dB
Dynamic Range Not specified by manufacturer
THD + Noise 0.057%, 12Hz to 20kHz
Power Requirements 115 or 230VAC, 50/60Hz
Dimensions (WxDxH) 19 x 10.5 x 3.5" (483 x 267 x 89mm)
Weight 18 lbs (8.2kg) shipping
Specialties Three 12AX7A vacuum tubes

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