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Post subject: Rumble v3 - Aux in and Effect Loop volume
Posted: Mon Apr 27, 2015 5:20 am
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Hello .. I have a brand new Rumble 100 v3, and discovered that the Auxiliary Input is directly "plugged" to the speakers ... the Master volume has absolutely no effect on it (!)
It means you have to be very careful about your source (mp3 player or PC) .. since a max volume on source will be directly heard as max on amp speaker (and your hears will remind you not to do it again !)
=>Does anybody know why Fender did that on that amp ?.. Is non-sense ..

Same story with the effect loop "Return". I'm using a looper (RC 30) .. the loops recorded are played by amp without any effect of Master Volume ...

On the other hand, I have a guitar amp (Fender Mustang III v2), and they did it smarter .. Master volume has last word on ANY input (Guitar, effect loop, aux in).
I'm quite disappointed with this technical choice on Rumble..


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Post subject: Re: Rumble v3 - Aux in and Effect Loop volume
Posted: Mon Apr 27, 2015 9:46 am
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They probably did it that way so the gain structure someone's got all nice and dialed in for the BG input will be preserved. I mean, say your tone depends on a certain gain/drive setting, and then you plug something into the aux in that would require the master be moved from where it is (say, lower). That would mean you'd have to mess with the early gain stages to compensate, and in the process possibly bugger the tone you already had. I can see the logic. Really, with portable mixers so cheap these days, I'd rather send the FX out to mixer channel 1, MP3 player to mixer channel 2, and mixer out to FX return. Now you've got some serious control, and you preserve the notion of zero interaction. Just remember to turn the mixer on first, and off last.

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Post subject: Re: Rumble v3 - Aux in and Effect Loop volume
Posted: Mon Apr 27, 2015 9:52 am
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Correction to last: For the MP3 player you'd use whatever channel supported a stereo (L/R) input. Or, split the MP3 channels between 2 mono inputs. Whatever suits the mixer you have.

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Post subject: Re: Rumble v3 - Aux in and Effect Loop volume
Posted: Wed Apr 29, 2015 2:37 pm
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Thanks for this first reply. I understand your point .. but continue to think this is a bad technical option.
-About setting the right volume for your sound, you can mainly play with the gain. On a transistor amp, master volume may not affect sound that much (as a tube amp would do). And usually your environment gives you the volume at which you can play.
-And even if the master is set at a volume you like and you don't want to change, you can still adjust the source to be at the right level for aux in. This doesn't prevent controlling the overall output of amp through a single Master volume.
-About intermediate "mixer" .. well, this is another component ... I'm not willing to buy more equipment because amp can't make it. And as said you have also the problem of stereo vs mono to manage properly.

At the end .. it would have been so easy to design as the guitar amp .. and let master volume control everything (to avoid killing your hears if you forgot to lower source..). I maintain my complain !
Any other comments ?

By the way, I'm very happy with the rest of controls, sound, design, and light weight of this amp ! The master volume controlling all inputs would have made it perfect to me !


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Post subject: Re: Rumble v3 - Aux in and Effect Loop volume
Posted: Tue May 05, 2015 3:38 pm
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Just would like to point out that other brand combos are also setup that way. My Ampeg combos were the same way for example. I think the littlest Ampeg now doesn't do it that way but my large Ampeg BA series combos did. It has to do with impedance loading concerns in the preamp probably. Auxiliary inputs are not fed directly to the speaker. Instead a direct input is a patch directly into to the power amp input bypassing the preamp completely because the signal is already line level and doesn't need boosting. Another possible reason it is done that way is so you can use the amp as a slave for another amp bypassing the preamp and EQ in the slave so that the master amp EQ settings control both amps.


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Post subject: Re: Rumble v3 - Aux in and Effect Loop volume
Posted: Mon May 11, 2015 4:28 am
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Hi.. Thanks for sharing information from other brands .. always interesting to benchmark.
Anyway, I don't expect Aux In to go through pre-amp at all (for sure impedance level can be an issue) ... but just to have a volume button between Aux In and Speakers, so that I can control on amp what gets out of amp (simple to do, I guess..).
Even for using amp as slave (by entering in Return of effects loop for example), I would still expect the slave amp to have a button for controlling the speaker level, so that I can potentially well balance the levels between the two.
The more I think about it, the less benefit I see to bypass the Master volume for both Aux In and Return ...
Any feedback from a Fender employee/expert to explain that technical decision on this amp ?!..
(I do hope Fender guys read the posts on forums :wink: )... Thanks !


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