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PostPosted: Fri Feb 23, 2018 12:37 pm 
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Bottle Rocket

Joined: Thu Mar 05, 2015 4:28 am
Posts: 15
I wonder if someone else noticed this, when engaging the built in reverb, the sound changes, become a little more compressed, it's like a mid cut, some of the frequencies in the middle feels like backing down, its noticed specially on the blue channel and a little on the red.


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PostPosted: Thu Mar 01, 2018 1:43 am 
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Bottle Rocket
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Location: Middle Tennessee
Before one of the knowledgeable folks chime in, I'll offer my half-baked theory. Engaging a tube-driven reverb engages an additional tube, adding compression (which enhances both lows and highs) giving the impression of less mids.


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PostPosted: Sun Mar 04, 2018 11:44 am 
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Triple Recto

Joined: Fri Feb 22, 2013 7:31 am
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Location: North Carolina
I will throw my 2cents in.... no comment..... ha, fooled you. :P

this may be true that the reverb will alter tone. It is after all an electro-mechanical effect using a transducer and springs with a pickup at one end, but it works.

So in other words, the reverb tank acts like a feedback circuit. the signal is takend off the front end of a series resistor on the signal path used to drive a separate tube circuit that controlls a transfomer to drive the transducer in the reverb tank. the mechanical vibrations in the springs are converted into a low voltage and current are used to drive an isolated triode gain stage and then fed back into the same signal path but at the other side of the series resistor. This will act like a form of negative feedback depending on the frequency of the return signal. Thus enhancing some frequencies or cancelling others depending on phase relationship. Also there will be considerable delay between the reverb return signal and the instantaneous guitar signal. The reverb is lagging behind the guitar so some change in tone should be expected. Unlike a digital processor using the send signal to process everything before it spits it back out to the return, the delay or phase relationsip may or may not be present. Some may sound realy good or some may sound sterile or less rewarding.

the Royal Atlantic as a comparison has only one return level control. If set to high has that compression effect and can literally swamp the tone and casue reduction in output levels. the TC seems to be an improvement but if you use too much reverb on your selected channel it will swamp the originating signal. this is probably true with all electro-mechanical reverb circuits.

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PostPosted: Sun Mar 11, 2018 10:46 am 
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Mark I

Joined: Thu Jun 09, 2016 6:54 pm
Posts: 23
Your deefinately not alone, the sound becomes quite noticably darker to me as well, so i just use my neunaber wet stereo reverb instead.

Once i set up the Boss ES8 im hoping i can add mids and bring bach the brightness by engaging the EQ pedal in the loopas i engage the mesa tc50 reverb, but i do feel this is something that should be done when building the amp... Maybe Mesa could have intergrated something into the circuit to boost mids when the reverb is selected so the feel remains in tact and all we notice is reverb...

Similar to what happens when we activate the fx loop... But even more apparent when you engage the reverb. Two small but annoying flaws IMHO


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PostPosted: Mon Mar 12, 2018 3:01 pm 
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Donating Member
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Location: Canada
Yep. I find the reverb to be a tone-wrecker on the RA. I can dial around it if Multi-Soak is off, but otherwise it's just too much trouble. I don't find the fx loop very useful for the same reason - basically I have to sit down and dial in the amp to use either reverb or the loop. I don't mind if the tone changes a little but like people mentioned, both seem to cut mids and lower the perceived level. This isn't a huge deal for me since I've been pretty much a guitar => (maybe)boost => amp guy for years and I don't mind running the delay in front on the rare occasions I use one, but it's just the "how much did I pay for features that are really hard to use" factor.

I'm guessing that the issue is that Mesa wants to offer the option of being able to cut them in and out of the signal path, which, um, in itself seems to create the reason why you'd wanna cut them out of the signal path...

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PostPosted: Tue Mar 13, 2018 5:43 am 
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Bottle Rocket

Joined: Thu Mar 05, 2015 4:28 am
Posts: 15
Mookakian wrote:
Similar to what happens when we activate the fx loop... But even more apparent when you engage the reverb. Two small but annoying flaws IMHO

Exactly! I was playing few days ago and as I’m currently without my FX unit, I was playing amp only and was trying reverb on/off to see which I like most and then tried the FX loop and again, there is a difference in the tonality,
I don’t like this, I don’t think an amp this level / quality company should have this kind of flaws, I want my sound to be consistent.
lucky for me I’m running Axe FX for all FX so no reverb etc but there are folks who love the built in reverb…


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