Tone TwEQer7

"Seven band equalizer plus volume for guitar or bass"



The Tone TwEQer7 graphic equalizer rack effect module compares to the Boss GE-7 Equalizer, one of a couple of classic equalizers in pedal format.  Provides fine-grained tone control, with little additional coloring of your signal.  As you increase the gain in the bands, you might eventually notice a little grit.  Can also be used as a clean boost or mild overdrive at higher Volume (gain) settings.  A bass version that compares to the Boss GE-7B is also available.  Plus you score a couple of extra "cool points" for having the lighted sliders in your rack.



The Tone TwEQer7 is a simple 7-band graphic equalizer that can be configured for guitar or bass.  The Volume control provides a significant active boost as you adjust it above midpoint.  It starts adding a bit of drive to your tone as you increase the boost level.



  • Tone TwEQer7 - compares to Boss GE-7 Equalizer

Band centers:  100Hz, 200Hz, 400Hz, 800Hz, 1.6KHz, 3.2KHz, 6.4KHz

  • Tone TwEQer7 Bass - compares to Boss GE-7B Bass Equalizer

Band centers:  62Hz, 125Hz, 250Hz, 500Hz, 1KHz, 2KHz, 4KHz



Output buffer



  • Custom Op Amps - There are 5 op amps in the circuit.  By default we use TL072 for all of them.  They are a quiet op amp with a little JFET warmth, but reasonably clean.  If you want a hi-fi op amp, the OPA2134 may be a good choice.  They are expensive.  Instead of changing them all, you might want to prioritize replacing the two op amps at the input and output of the circuit.  Changing them will probably have more impact than changing the other three.
  • Components - We use metal film resistors and a selection of capacitors that provide clean tone and low noise. 


Front Panel

  • (7) lighted sliders for frequency adjustment
  • (1) lighted slider for volume adjustment


Rear Panel

  • Audio In
  • Audio Out
  • On/Off Footswitch
  • On/Off Override
  • DC Power
  • DC Power LED


Module Width

  • 3.5" standard
  • left wing and right wing are not presently available


Power Consumption (aprox)

50 - 80mA


Base Configurations

Part # Description List Price
MOD-TWEQ7 Tone TwEQer7 module $249
MOD-TWEQ7B Tone TwEQer7 Bass module $249



Part # Description List Price
MOPT-TWEQ7-OPA Custom Op Amps $0 - TBD
MOPT-TWEQ7-CC Component Changes $0 - TBD



Part # Description List Price
MPT-TWEQ7-CA Replacement switch, jack, LED cable assembly $19
MPT-TWEQ7-SLDR Replacement slider $19
MPT-TWEQ7-PB Replacement power board $29
MPT-TWEQ7-SB Replacement switching board $29