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Old 11-07-2012, 04:52 PM   #1
Endth
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Question Is it possible to convert a solid-state guitar amplifier into a bass amplifier? How?

I'm sure a proper bass amp is the solution here. But I was once told by some old man that I just needed to switch out the speakers for bass speakers.

So I thought I might try something here. I could take my Behringer GMX 212, and switch one of the guitar speakers for a bass speaker.
Somehow have a Y switch in between the speakers. (BASS/GUITAR) kind of thing.

But a friend of mine in recent conversation made me realize how it may not be THAT simple, with "ohms" and everything.

I know nothing, i'm basically like a plumber, trying to figure out a wiring solution for multiple things in one.

Help
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Old 11-07-2012, 04:59 PM   #2
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Yes, you need bass speakers. Guitar speaker will self destruct if you play bass through them. The low frequencies make the cones move too much.

But typically, guitar amplifiers don't have enough power or clean headroom for bass. And for best results, bass speakers need an appropriately sized closed or ported cabinet

So the solution is, as you assumed, a proper bass amp
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Old 11-07-2012, 05:06 PM   #3
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Quote:
Originally Posted by seljer
Yes, you need bass speakers. Guitar speaker will self destruct if you play bass through them. The low frequencies make the cones move too much.

But typically, guitar amplifiers don't have enough power or clean headroom for bass. And for best results, bass speakers need an appropriately sized closed or ported cabinet

So the solution is, as you assumed, a proper bass amp

I think what he's saying is, if it's possible to install a switch or similar onto the amplifier to switch between a 'guitar' speaker and a 'bass' speaker.
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Old 11-07-2012, 05:16 PM   #4
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Just use it.

Yes, depending on the speakers, playing Bass through them MAY eventually destroy them, but it's not going to happen in an instant.

The amp in question is a low end practice amp, and I'd be willing to speculate that well before you do any noticeable damage to your speakers you'll have either upgraded your gear or quit playing...
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Old 11-07-2012, 06:06 PM   #5
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I thought it was the other way, that playing a guitar through a bass amp would mess it up? I suppose theres no reason both can't be true, it just seems like playing a bass through a guitar amp would just sound really weak, because it isn't designed for those low frequencies.
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Old 11-07-2012, 06:07 PM   #6
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Quote:
Originally Posted by Endth

So I thought I might try something here. I could take my Behringer GMX 212, and switch one of the guitar speakers for a bass speaker.
Somehow have a Y switch in between the speakers. (BASS/GUITAR) kind of thing.

But a friend of mine in recent conversation made me realize how it may not be THAT simple, with "ohms" and everything.



You could use a SPDT switch to choose between different speakers. As for ohms make sure the rating of the speakers match your amps output.

I'd just get a bass amp though.

This pretty much sums it up -
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Originally Posted by Arby911
The amp in question is a low end practice amp, and I'd be willing to speculate that well before you do any noticeable damage to your speakers you'll have either upgraded your gear or quit playing...
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Old 11-07-2012, 08:01 PM   #7
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But typically, guitar amplifiers don't have enough power or clean headroom for bass. And for best results, bass speakers need an appropriately sized closed or ported cabinet

Alright so...
Is it possible to have variable power & or headroom? I guess what I mean is, would it be possible to make a multi-purpous amplifier with a switch?

I think my Bugera already has this kind of thing... but probably not common on solid-state amps like the Behringer GMX 212. I'm not touching my Bugera though.

Otherwise there's nothing to stop me modifying the cab... It's made of wood. Making the speaker hole bigger? Building a new one entirely? Rigging it with some kind of power switch with different outputs on each side?



Can anyone elaborate here? Besides telling me I should just get rid of the amp and buy a bass amp, that's ******ed. I'll get one eventually, this is about the ****ing concept here, which could prove very useful.

I'm looking for answers from people who are interested in how electronics work.

Last edited by Endth : 11-07-2012 at 08:07 PM.
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Old 11-07-2012, 08:41 PM   #8
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Yes you can use a guitar amp, but you need a bass speaker or like said, you run the risk of destroying it.
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Old 11-07-2012, 09:03 PM   #9
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Quote:
Originally Posted by Endth
Alright so...
Is it possible to have variable power & or headroom? I guess what I mean is, would it be possible to make a multi-purpous amplifier with a switch?


Both of those things are very possible. A lot of builders are experimenting with and implementing variable voltage supplies in their builds these days....

But are you wanting to build an amp, or stick a speaker in your behringer???

Quote:
Originally Posted by Endth
Can anyone elaborate here? Besides telling me I should just get rid of the amp and buy a bass amp, that's ******ed.


Its not ******ed, its perfectly good advice. You have no idea how the amp will sound with the bass. The money you spend on a good bass sub could be spent on a used bass combo.

If you really want to do it then go find a cheap used bass speaker, stick it in there and see how it sounds. I wouldn't spend much money on it at first though.

Last edited by Culler Amps : 11-07-2012 at 09:05 PM.
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Old 11-08-2012, 12:14 AM   #10
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Quote:
Originally Posted by Endth
I guess what I mean is, would it be possible to make a multi-purpous amplifier with a switch?


Yeah. If done properly, you're looking at a few thousand dollars though.

Also, something that noone has mentioned directly thus far, guitar amps and bass amps have different frequency responses - meaning, different mid cuts, different definitions of what a "treble" knob should do, etc. It's entirely possible (probable I'd say) that it ends up sounding like crap.

Just my $.02
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Old 11-08-2012, 12:40 AM   #11
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I did this exact thing with a crappy MG100dfx I had... slapped a 150W bass speaker in there (slightly overkill, but whatev), and now it's the multipurpose bass/guitar amp. Nice thing with the MGs is that they actually have a variable ohm/power rating... it's rated at 100W at 4 ohms, 80W at 8 ohms, which is what the speaker I bought is. It's still plenty loud, and it's pushing enough power to get a decent bass response.
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Old 11-08-2012, 02:49 AM   #12
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Interesting bits of information. Thanks! Idk, might get lucky and find the right kind of speaker, if my amp turns out to be any kind of versatile. SPDT in between speakers if possible, or disconnectible wires whatever. Idea being not to use the wrong speaker w/ wrong instrument. Even though i don't believe the effects are as bad as everyone seems to think. Keeping safe. Hey if the speaker is $40... cheap and just might be good enough.
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Old 11-08-2012, 02:13 PM   #13
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For $40 you can find a good used bass amp.

But if you happen to have a bass speaker lying there not being used, its an almost OK solution. I did it with a super cheap little 10W amp, after trying it with a bass for about 15 minutes and blowing the speaker! The bass speaker I used was from an old computer subwoofer. The final result is unimpressively quiet. 10W is not really enough to push a bass speaker. It's OK for practicing alone, slightly better than unplugged.
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Old 11-09-2012, 02:21 PM   #14
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A $40 bass second hand bass amp?? Can't be good. But if it was, nice ****in deal. I'm looking for something a bit bigger.

As for your experiment, not what i'm looking for, but that's alright, thanks for sharing.
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