The Bass & Treble Controls in Xotic's Effects

[bobbyk]

Looking for help in determining how the bass and treble controls/circuits in  Xotic Effects  RC and AC Boosters and BB preamp work. They seem to be active in that centered is "normal" tone, counterclockwise rolls off the treble/bass and clockwise adds treble/bass. Xotic covers their circuit boards so I can't see the circuit.

Does anybody know how they do the treble/bass or what the tone circuits look like?

Thanks in advance!

[aron]

Look for baxandall circuits. Check out the schematics forum in the EQ section:

http://www.diystompboxes.com/smfforum/index.php?board=21.0

Also, look at the Duncan Tone stack calculator which linked in the above thread.

[theman]

Looking for help in determining how the bass and treble controls/circuits in  Xotic Effects  RC and AC Boosters and BB preamp work. They seem to be active in that centered is "normal" tone, counterclockwise rolls off the treble/bass and clockwise adds treble/bass. Xotic covers their circuit boards so I can't see the circuit.

Does anybody know how they do the treble/bass or what the tone circuits look like?

Thanks in advance!

i've heard that the bass and treble controls are active baxandall in the xotic lineup. the duncan stuff in the tonestack calculator is passive, and you've got to be careful about output loading. there's also loss in the passive version, and you can't get a boost.

look at the tone control and output section of the sansamp gt-2 from tonepad.com. that uses an active baxandall that is pretty flexible.

[JHS]

Kusi posted the schem for his "LA-B-drive" some time ago in the German forum.
The LA-B-drive uses the original Xotic Baxandall t-stack.

JHS

[kusi]

Kusi posted the schem for his "LA-B-drive" some time ago in the German forum.
The LA-B-drive uses the original Xotic Baxandall t-stack.

JHS

or the BOSS FA-1 (add some clipping-diodes in the FB_loop and you have a Xotic-pedal.

mfg kusi

[Rob Strand]

> the BOSS FA-1

Is the xotic EQ the sames as your LA Boutique Drive or like the Boss FA-1?   

[kusi]

adjust some values in the FA-1-tonestack, and you have the XOTIC-tonestack. (look at the LA-Boutique-screamer...  )
(the Xotics have a bit more Bass)

regards,
kusi

[Rob Strand]

Thanks kusi!