Passive tone control

[seantkezm]

Hello all,
I am curious as to your expert opinions on the use of a passive tone control board. Something akin to this fleabay example:
Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay

I realize that this is a "subtractive" option as far as gain is concerned. However, I am more concerned whether fidelity could be an issue as total volume shouldn't be.

Thank you all for your time and your knowledge!

 

[JonSnell Electronic]

Without a schematic ... How long is a bit of string? It is, if gain before and after is not a problem, a well used way of producing a desired result.

 

[dreadnoughtstrength]

Hello all,
I am curious as to your expert opinions on the use of a passive tone control board. Something akin to this fleabay example:
Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay

I realize that this is a "subtractive" option as far as gain is concerned. However, I am more concerned whether fidelity could be an issue as total volume shouldn't be.

Thank you all for your time and your knowledge!

I've used a few of the China-spec boards now for various things and they've all worked as expected. You can always use decent quality pots/etc if they're noisy, but aside from that I've never had an issue.

 

[rayma]

I am more concerned whether fidelity could be an issue as total volume shouldn't be.

You should know the input and output impedance of the board, to see if it's compatible with your other components.

 

[Mooly]

^ Yes. That is very important.

A passive stage could have a typical insertion loss of around 20db. In other words, with the controls centred you would only get 0.1 volt out for 1 volt input.