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Summit Audio EQF-100 Tube Parametric Equilizer  From Summit

4-band fully parametric EQ, plus 3-position high and low pass filters allow you to sculpt tones like no other.

Summit Audio


Retail:  $3,899.99

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Call us now to set up a free trial in your home or studio: 888-528-9703. Our specialists will help you select the best fit for your needs and hook up your free trial for the ultimate peace of mind. Experience the Sound Pure difference!
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Manufacturer's Description from Summit

Smooth and precise

Rich, smooth tone and an openness are just the beginning. Experience how an EQ of this caliber will breathe life into your sound. The EQF-100 is a no compromise solution for precision tone shaping.

Four bands plus

The EQF-100 provides 4 bands of fully parametric equalization and an additional 3 position high and low pass filter for added flexibility. Each band features a seven position fixed frequency selector that works in conjunction with the bandwidth knob to allow you to tune the slope of the EQ curve.

Under the hood

The EQF-100 represents the pinnacle of quality passive EQ design. Finer details include individualy hand-tuned frequencies and a transformerless tube/solid-state hybrid signal path. Only custom wound inductors and hand-tuned capacitors are used to filter the signal because active elements can create phase anomalies.

Hand-crafted in the USA

Each piece of Summit gear is meticulously crafted by hand in our shop using only the best quality components and attention to detail. Quality components and engineering know-how are the critical element to the sound and longevity of audio gear.

Summit Audio

About Manufacturer

Hello and thank you for choosing Summit Audio! We have a long history of manufacturing the highest quality audio processing equipment on the planet. From microphone preamps and compressors, to digitally controlled equalizers with software control, depend on Summit Audio for the highest quality and best sounding audio equipment for your professional recording studio, post production facility, broadcast studio, or performance audio venue. All Summit Audio products are manufactured in the United States at our Northern California based headquarters and undergo strict and vigorous testing. Every piece is individually hand crafted to the highest standards using Audio Precision testing equipment.


Selectable Frequencies

  • BAND 1 FREQUENCIES:  33 Hz, 56 Hz, 100 Hz, 180 Hz, 220 Hz,270 Hz, 390 Hz
  • BAND 2 FREQUENCIES:  250 Hz, 330 Hz, 470 Hz, 560 Hz, 680 Hz,820 Hz, 1.2 kHz
  • BAND 3 FREQUENCIES:  1 kHz, 1.5 kHz, 1.8 kHz, 2.2 kHz, 2.7 kHz,3.9 kHz, 5.6 kHz
  • BAND 4 FREQUENCIES:  3.3 kHz, 4.7 kHz, 6.8 kHz, 8.2 kHz, 10 kHz,12.5 kHz,15 kHz


  • HIGH FILTER: 8.2 kHz, 12 kHz,18 kHz
  • LOW FILTER: 22 Hz, 47 Hz, 82 Hz
  • Input: +4 dB female XLR
  • Output: +4 dB male XLR

Max level

  • Max input level (XLR): +25dB
  • Max output level (XLR): +25dB
  • Max gain: 18dB 1 frequency, 25dB two overlapping frequencies

Operating Measurements

  • Frequency response: 12Hz-50kHz flat, 12Hz-100kHz -1.5dB
  • Signal to noise ratio:
  • Tube: 127dB average 20Hz-20kHz
  • THD + Noise:
  • Tube: 0.026% @ 1kHz, 0dBu
  • Vacuum tubes: three 12AX7A

Power Configuration

  • Internal AC Supply
  • 35 watts, 115 or 230 volts, 50 or 60 Hz ( Switchable)
  • Fuse: 0.5 Amp for 115VAC and 100VSC, 0.25 AMP for 230 VAC.

Size and Weight

  • Height:  3.5 inches (8.89 cm)
  • Width:  19 inches (48.26 cm)
  • Depth:  10 inches (25.40 cm)
  • Weight:  17 pounds (9.45 kg)


3 year limited warranty.






EQF-100 User Manual

User Manual

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