Fostex R82B Attenuator for Guitar amp

promitheus · 9th September 2007, 05:08 PM

HI,

has anbody used a Fostex R80B or R82B attenuator as a guitar amp output attenuator?
Or do you have a another good solution?

Nigel Goodwin · 9th September 2007, 09:28 PM

Perhaps you should mention exactly what you're wanting to do?, if it's feed the output of a guitar amp to a mixer?, I would suggest a suitable DI box - I use Behringer dual ones, which are excellent, and have switchable attenuators for feeding from speaker levels.

Zung · 22nd September 2007, 10:04 PM

I use a Monacor AT-60, which is basically the same thing: an L-pad attenuator.

Be wary of the power rating: it's grossly over stated. To stay on the safe side, I use a simple 2 resistors divider between the amp out and the L-pad: 2,2 ohms in serie, and 22 ohms in parallel, both 20 watts or more.

I have this setup for a number of years without any problem. The tone is a bit different because the amp sees an almost purely resistive load instead of a speaker.

There are a number of "compensated" attenuators like the Hotplate that simulate a speaker load, but you'll have to pay $200 & up.

9th September 2007, 05:08 PM	#1
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Fostex R82B Attenuator for Guitar amp HI, has anbody used a Fostex R80B or R82B attenuator as a guitar amp output attenuator? Or do you have a another good solution?

9th September 2007, 09:28 PM	#2
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	Perhaps you should mention exactly what you're wanting to do?, if it's feed the output of a guitar amp to a mixer?, I would suggest a suitable DI box - I use Behringer dual ones, which are excellent, and have switchable attenuators for feeding from speaker levels. __________________ Nigel Goodwin

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22nd September 2007, 10:04 PM	#3
Zung diyAudio Member Join Date: Apr 2005 Location: Geneva	I use a Monacor AT-60, which is basically the same thing: an L-pad attenuator. Be wary of the power rating: it's grossly over stated. To stay on the safe side, I use a simple 2 resistors divider between the amp out and the L-pad: 2,2 ohms in serie, and 22 ohms in parallel, both 20 watts or more. I have this setup for a number of years without any problem. The tone is a bit different because the amp sees an almost purely resistive load instead of a speaker. There are a number of "compensated" attenuators like the Hotplate that simulate a speaker load, but you'll have to pay $200 & up.

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