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Post subject: matching fender twin eq
Posted: Mon Feb 14, 2011 7:03 am
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i want to match the eq (using a danelectro fish and chips) of the normal channel to the vibrato channel because I like the way the clean sounds on the normal channel but my dirt boxes sound better on the vibrato channel. so i can kick on a loop with my dirt boxes and eq pedal to simulate the dirt boxes going into the vibrato channel. I do have a aby box but i dont wanna constantly have to match up the volumes. any ideas on the frequency differences? I think it says in the manual more highs and mids but I'm not sure exactly what bands?


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Post subject: Re: matching fender twin eq
Posted: Mon Feb 14, 2011 10:19 am
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Hi anth202,

I'm not sure what you are asking. And which Twin do you have? I think that you have a separate EQ for each channel on your amp, you can set the EQ controls on each channel the same way. As far as how to set the bands on your fish & chips EQ, your ears will tell you that, move the sliders around til you like the sound.

The lower numbers like 100 and 200 on the EQ pedal are for low end (bass), and the higher numbers like 2K and 4K are the high end (treble), obviously then the sliders in the middle are the mid frequencies. The channels on the amp only have two or three bands (bass, mid and treble) which each handle a wide band of frequencies, whereas the Fish & Chips has seven bands, each one for more precise adjustment of a narrower band of frequencies. If you want more highs and mids from the pedal, then increase the middle three sliders and the last two sliders (not counting the level slider). Maybe think of the sliders on the pedal as; First two are for bass, middle three are for mids, and the last two are for the treble. Adjusting the "level" out of the pedal will affect the sound also, helping to balance it more. The level is more like a volume for the pedal, and is not one of the frequency sliders. :idea:

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Post subject: Re: matching fender twin eq
Posted: Tue Feb 15, 2011 2:26 am
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thank you for response. i have the 65 fender twin reverb reissue. i want to match the normal channel to the vibrato channel if all the eq knobs are at 5.


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Post subject: Re: matching fender twin eq
Posted: Tue Feb 15, 2011 3:05 am
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The operative issue here is that of some attenuation of the vibrato channel gain caused by the inherent insertion loss of the tremolo circuit, regardless of whether it's engaged or not. This condition is common to all dual-channel tube Fender amps with tremolo, both vintage and re-issue, and is periodically more pronounced in some amps than others. In the case of the TR and TRRI, the tone stacks of both channels are identical -- but if the vibrato channel gain is diminished to one degree or another, the human ear often perceives that as a roll-off of selected frequencies (generally the mids and the highs). It's one of the reasons that SRV's Cesar Diaz-modded Fenders often had a switch added to the rear panel to take the tremolo completely out of the pre-amp circuit. For otherwise all-stock amps, jacking the vibrato channel's volume control up a notch is usually all that's needed to match the levels (and the tone) of the normal channel. Likewise, when jumpering channels to use them simultaneously (or using an A/B/Y box to accomplish the same), the TRRI's channels are "out of phase" with one another. This will also reduce the frequency response and (to a lesser extent) the gain of both channels.

HTH

Arjay

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