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With an acoustic guitar, is it appropriate (i.e is the sound quality retained) to run the guitar through a high end electric guitar amp? I'm considering buying an Orange Crush 120C amplifier for my electric to play gigs with, but I also play my acoustic live a lot. I don't want to sell my amp that I use with my acoustic (Marshall 50DFX) if the sound quality through the Orange for an acoustic isn't as good, however the money would be useful towards the new amp.

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Are you really asking if the new amplifier would be any better or worse for acoustic guitar than your current one, which is also designed for electric guitar? –  jonrsharpe Jul 11 at 16:06

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Electric guitar amps are not intended to faithfully reproduce the sound of the electric guitar, but to shape it and give it a new sound entirely. Alot of people will buy their electric guitar amp on the basis that they feel it gives them the sound they're looking for.

As for amplifying acoustic guitar, that's not quite the case because the whole thing about acoustic instruments is that they have their own acoustical properties and we're trying to take that sound and make it bigger for a larger group of people. But we don't want to wreck it. There may be a bit of artificial reverb, or some subtle EQ and tone-shaping.

So, yes, you can buy a dedicated acoustic guitar amp, but have you tried playing your acoustic guitar through a PA, either miked, direct, or some combination of those two? If you want good sound, you should apply some signal processing and then reproduce the sound faithfully through either an acoustic amp or PA. And the transducer source (pickup) may be one of the most important things in this signal chain. In my experience the best results are from blending a good pickup with a mic.

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That makes sense, I like the idea of combining a mic'ed and a direct sound. Is the direct sound generally where DI boxes are used? –  alexheslop1 Jul 11 at 13:57
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Yes, that's the idea. Either way, if you're playing at venues that have a PA (or you have one already), that's a good place to start! –  Grey Jul 11 at 14:01

There are in fact acoustic guitar amps out there that you can buy for this purpose. If you have the money to spend on it, I would definitely recommend that. Other than that, regular amps are okay for acoustic guitar, although you'll find that the sound is not ideal this way. Additionally, acoustic guitar amps use notch filters to prevent feedback, which is also something your regular amp would be lacking.

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Yeah, I'd love an acoustic amp, but unfortunately I don't have either the money or the amount of solely acoustic gigs to validate having one! –  alexheslop1 Jul 11 at 13:42

Yes, it's okay, no big difference.

Actually, you only need pre-amp, equalizer, and a reverb. But, if you're playing in a big gig show, soundhole cover is needed to avoid the feedback, but in some case that your acoustic guitar already have notch filter or feedback reducer, it's fine not to attach soundhole cover. I always play my acoustic through electric guitar amp (Marshall MG30CFX), with crunch mode, sounds good, and it's okay.

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I can certainly sound good (depending on what sound you want), but at any rate it is a big difference. For one thing, e-amps don't have any dedicated treble drivers: a clean electric guitar has a cut-off at no more than 6 kHz anyway and distortion introduces rather too much in the range above; but for a clear acoustic sound a faithful projection of the range 10-15 kHz is really desirable and you won't get that from an electric-guitar amp. Also, the uneven frequency response tends to make any feedback problems rather worse. –  leftaroundabout Jul 11 at 15:57

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