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Summit Audio EQF-100

Single Channel Passive 4-Band Parametric Tube Equalizer with HP and LP Filter Section
The Summit Audio EQF-100 is a full range passive parametric equalizer that utilizes vacuum tube technology to overcome any gain loss.
This passive tube EQ is an incredibly warm sounding and accurate equalizer, hand built in the USA to the most exacting standards.

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The Summit Audio EQF-100 uses both solid state and tube technologies to produce the warm sounds associated with tubes, while providing the reliability of solid state devices.
Providing 4 bands of fully parametric equalization, the EQF-100 Passive EQ is a tube/solid state hybrid equalizer for the most discerning listener. The EQF-100 features individually, hand-tuned frequencies, silent master bypass switch and individual bypass per band, both high-pass and low-pass filters which can be bypassed from the signal path, and a transformerless signal path. Add the EQF-100 to your signal path to give you that sizzle, air, grind, warmth, sheen and heat to make your sound really stand out. Add another channel and you have the perfect flavor for mastering and final mixing to take out any digital harshness and add a signature slice of originality and tone.


Summit Audio EQF-100 Features :
  • 4 Band Parametric equalizer
  • HP and LP filter section
  • Silent bypass switch
  • Individual bypass for each band
  • Individually hand-tuned frequencies
  • Transformerless signal path
  • Hand crafted in the USA
  • Backed by Summit Audio's 3 Year Warranty


The penultimate of classy, rich tone, the Summit Audio EQF-100 is a full range passive parametric equalizer unequaled in the market today. Utilizing vacuum tube technology to overcome any gain loss, the EQF-100 provides 4 bands of fully parametric equalization, the EQF-100 also has both high and low pass filters which can be bypassed from the signal path. The EQF-100 uses both solid state and tube technologies to produce the warm sounds associated with tubes, while providing the sweet open air of discrete solid state devices. This passive tube EQ is an incredibly warm sounding and accurate equalizer, hand built in the USA to the most exacting standards.

Whether mixing or tracking, one channel of the highest quality passive equalization on the planet will give you that sizzle, air, grind, warmth, sheen and heat to make your sound really stand out. Add another channel and you have the perfect flavor for mastering and final mixing to take out any digital harshness and add a signature slice of originality and tone.




EQF-100 Basic Operating Instructions :

Basic setup:
Plug the EQF-100 directly into the insert jack or after the main outputs on the mixing console. Put the insert send into the XLR input, and the XLR output back into the insert return of the desired channel. If outboard preamps are being used, try sending the output of the preamp into the EQF-100. This EQ is also perfect before or after a compressor, and for side chain effects such as de-essing.



Boosting a frequency:
Select which frequency you want to boost, put the Boost/Cut/Bypass switch to plus and increase the gain. Use the bandwidth control to affect more or less of the surrounding frequencies. A lower number on the bandwidth knob means a narrower bandwidth. If the frequency you want to boost is on the high or low band, set the Shelving/Resonant switch to resonant.

Setting up a low or high filter:
Set all four Boost/Cut/Bypass switches to Out. Adjust the two filter settings to the desired frequencies.



Notch filtering:
Find the approximate frequency to be attenuated (low, mid-low, mid-high, high). Set the bandwidth to wide (ten), the Boost/Cut/Bypass switch to Cut (minus), and the filter type to resonant (high and low bands only). Turn the gain all the way up (for the highest amount of cut) and start narrowing the bandwidth. Use the frequency select and bandwidth to narrow in on the frequency to be attenuated. Decrease the gain knob (decreasing the amount of cut) until the frequency is cut with the least effect on the surrounding frequencies.



Low or high shelving:
Set the low or high EQ sections to shelving filter. Select the frequency where roll-off or boosting is to begin. Select plus or minus on the Boost/Cut/Bypass switch and turn up the gain knob to cut or boost above the high frequency selected or below the selected low frequency.



The History of Summit Audio :
Summit Audio began their foray into the professional audio world in 1979. A few years later, Summit Audio released the original TLA-100 tube leveler that would later evolve into the highly sought after TLA-100A, still manufactured today unchanged after twenty years, and whose signature sound has graced countless songs and albums to date.

Now a real force in the audio world, Summit Audio's foundation of high value, no compromise products with intense testing and unparalleled commitment to its customers needs is the perfect launching pad for a bright future of innovative and interesting products, all with a commitment to excellence and a passion for creating inspirational audio products.
As Summit evolves with the dynamic world of professional audio, they still stick to their basic traditions of solid reliability, precise manufacturing and integrity in everything they do.

Each Summit Audio product is crafted, manufactured and tested exclusively in the United States to the most exacting standards, utilizing human ears in addition to the best available test equipment along with years of combined experience and customer input.
Having built a reputation upon superb and reliable products, professionals worldwide trust Summit Audio for their critical studio applications.