Summit Audio EQF100
Tube EQ, Parametric


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List Price: $3,899.99
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Summit Audio's EQF100 is a Full Range Passive Tube Equalizer.

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 know 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 individually hand-tune 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 Summit's 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.


Size and Weight

  • Height: 3.5"
  • Width: 19"
  • Depth: 10"
  • Weight: 17lbs

Power Configuration

  • Internal AC Supply, 35W, 115V or 230V, 50Hz or 60Hz (switchable)
  • Fuse: 0.5A for 115VAC and 100VSC, 0.25A for 230VAC

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: 8.2kHz, 12kHz, 18kHz
  • Low Filter: 22Hz, 47Hz, 82Hz


  • Input: +4dB female XLR
  • Output: +4dB 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: 3 12AX7A


  • 3-year manufacturer's limited warranty 

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