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The EQF-100 from Summit Audio is a single channel, 4-band fully parametric passive equalizer that is suitable for both tracking and mixing. The unit is a hybrid processor that uses solid state technology to provide reliability, while the vacuum tube amplifier delivers tube "warmth" and provides gain to overcome any loss when cutting frequencies.
The EQF-100 features individually, hand-tuned frequencies, a silent master bypass switch and individual bypass switches on each band. Additionally, 3-position high-pass and low-pass filters can be switched into the transformerless signal path. This passive EQ is incredibly accurate, sounds wonderful, and is hand built in the USA to the most exacting standards.
4 bands of 7 switch-selectable center frequencies
Switchable high- and low-filters, with 3 selectable frequencies each
Continuously variable boost or cut
Individual in/out switch for each of the 4 bands
Silent global bypass switch
105dB of dynamic range
Transformerless signal path
990 output stage (balanced or unbalanced)
Universal internal power supply
Hand crafted in the USA
In the Box
Summit Audio EQF-100 - Tube/Solid State Hybrid Equalizer
AC Power Cable
Three (3) Year Warranty
Table of Contents
Fully parametric High- and low-pass filters
Number of Channels
1 x XLR
1 x XLR
Maximum Input Level
Band 1: 33, 56, 100, 180, 220, 270 and 390Hz Band 2: 250, 330, 470, 560, 680, 820Hz and 1.2kHz Band 3: 1, 1.5, 1.8, 2.2, 2.7, 3.9 and 5.6kHz Band 4: 3.3, 4.7, 6.8, 8.2, 10, 12.5 and 15Hz
Variable, dependent on adjacent bands
Maximum Output Level
12Hz to 50kHz, flat 12Hz to 100kHz, -1.5dB
THD + Noise
0.026% @ 1kHz, 0dBu
115 or 230VAC, 50/60Hz
19 x 10.5 x 3.5" (483 x 267 x 89mm)
21 lbs (9.45kg) shipping
Three 12AX7A vacuum tubes
Summit Audio EQF-100 - Tube/Solid State Hybrid Equalizer Review