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Post subject: Preamp bypass on Super Champ XD
Posted: Wed Mar 31, 2010 11:32 am
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Hi everyone, greetings from a newbie!

I have a question that I'm sure someone on this forum can answer.

I have an SCXD that I bought just a few weeks ago. Although the some of the built-in preamp sounds are really good, I'd also like to be able to bypass the preamp and feed the output of an external preamp straight into the tube power amp. I know that there is a simple wiring mod that can be done to create a 'line in', and I'm sure I can/will make the mod sometime. But I'm reluctant to invalidate the warranty while the amp is still so new. So I'm trying to find a nother way to get an unmodified signal into the power amp.

Does anyone know if there's any way to put the preamp DSP into 'bypass' mode so it feeds an unmodified signal out to the power amp?

If not, can anyone suggest which of the voices/settings gets closest to a pure clean bypass? I know the 'clean' channel signal passes through the DSP and gets modified, so I'm assuming that won't work. Ideally I want the bypass not to break up even at high signal levels, so that I can 'push' the power amp without putting the DSP preamp into distortion.

Any thoughts very, very much appreciated...hope the question is clear enough!


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Posted: Fri Apr 09, 2010 2:34 pm
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OK, before I give up and ask this question on other forums, I'll just try 'bumping' it once.

Come on, SCXD owners! I know there are trillions of you and you love your amps! Someone must know the answer! :D

Cheers

Booleanmattock


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Posted: Fri Apr 09, 2010 7:30 pm
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Would have been excellent if Fender had made the Ch1 be a straightforward tube amp, and Ch2 be the DSP. But that is not what is in the box. It appears that the tone stack is in the DSP also. So bypassing renders the amp kind of useless, I guess. Here is a web page maintained by a very respected poster in here:

http://billmaudio.com/wp/?page_id=243

Scroll down to see his response to your actual question.


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Posted: Sat Apr 10, 2010 8:29 am
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WhatsThatSmell wrote:
Would have been excellent if Fender had made the Ch1 be a straightforward tube amp, and Ch2 be the DSP. But that is not what is in the box. It appears that the tone stack is in the DSP also. So bypassing renders the amp kind of useless, I guess. Here is a web page maintained by a very respected poster in here:

http://billmaudio.com/wp/?page_id=243

Scroll down to see his response to your actual question.


Many thanks for your help Mr WhatsThatSmell!


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Posted: Sun Apr 11, 2010 5:37 am
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PS I tried an experiment last night - fed a white noise signal into the preamp and put the Line Out into a spectrum analyzer. Conclusions:

Preset 4 and the Clean channel are closest to flat frequency response (I think several people have said that they are basically the same DSP preset). You need to put the Bass control on 5 and back the Treble all the way down to about 3 on Clean.

I spent some time last night with the Clean volume set to 10, Treble on 3, Bass on 5, left the controls on the amp like that and controlled the sound from my preamp. Sounded good...


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