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-   -   Using pro audio mixer as pre-amp (http://www.avsforum.com/forum/90-receivers-amps-processors/1527229-using-pro-audio-mixer-pre-amp.html)

kbeam418 04-13-2014 06:40 PM

My Sony TA-E731 pre-amp is good but it has one big problem, whenever I have the bass boost and bass knob up (about +13 dB of bass) there is horrible digital distortion regardless of where the volume control is. So I'm thinking about buying a mixer because I can control the gain and see what's clipping and I like the feel of mixers more than basic pre-amps tongue.gif but how do these sound compared to a home audio pre-amp. I'll be buying cheap 12 channel Behringer (spelling?), I know Behringer is a crap brand but I've never had any problems with the ones I've used, I may consider Carvin mixers, if they're cheap.

FMW 04-14-2014 02:23 AM

Consider buying a subwoofer instead.

fatbottom 04-14-2014 02:29 AM

yup. +12dB bass boost would sound bad. Buy a sub if you want more bass, and extend below your speakers response.

kbeam418 04-14-2014 06:06 PM

Quote:
Originally Posted by fatbottom View Post

yup. +12dB bass boost would sound bad. Buy a sub if you want more bass, and extend below your speakers response.

I can add 15 dB of bass on a mixer at church and there is 0 distortion, no sub woofer is being used. I thought my speakers were the problem because they're "white van" speakers but once I turned "DBFB" (Sony's name for bass boost) the distortion went away, so a mixer would solve that problem.

Yubbie 04-14-2014 10:10 PM

I'll answer your question first: Yes, the Behringer mixer will probably give you a cleaner low end boost than your Sony pre-amp. You are correct, Behringer gear is bottom-of-the-barrel gear for live PA and you will get what you pay for in terms of sound quality and reliability. But, that may get you a slight improvement with your bass boost.

Now on to your real problem: You shouldn't have to boost any portion of an EQ by that much. This tells me that your amplification and speaker system is inadequate for the levels that you're wanting to achieve. EQ should just be used to slightly flavor the sound. As others have suggested, it sounds like you need a subwoofer, not a mixer.
Quote:
I can add 15 dB of bass on a mixer at church and there is 0 distortion, no sub woofer is being used.
You're comparing apples to oranges here. Also, just because you don't push a system into distortion doesn't mean it still sounds good. The thought of adding +15 boost on an EQ just makes me cringe.

Yubbie

kbeam418 04-17-2014 12:53 AM

Quote:
Originally Posted by Yubbie View Post

I'll answer your question first: Yes, the Behringer mixer will probably give you a cleaner low end boost than your Sony pre-amp. You are correct, Behringer gear is bottom-of-the-barrel gear for live PA and you will get what you pay for in terms of sound quality and reliability. But, that may get you a slight improvement with your bass boost.

Now on to your real problem: You shouldn't have to boost any portion of an EQ by that much. This tells me that your amplification and speaker system is inadequate for the levels that you're wanting to achieve. EQ should just be used to slightly flavor the sound. As others have suggested, it sounds like you need a subwoofer, not a mixer.
You're comparing apples to oranges here. Also, just because you don't push a system into distortion doesn't mean it still sounds good. The thought of adding +15 boost on an EQ just makes me cringe.

Yubbie

My speakers are junk, they can push out bass but it takes about 20 watts to do so. The reason why I'm asking about a mixer is because I like using mixers over pre-amps, the volume controls are free of channel imbalance, you can tell if something distorting by looking for clip lights, and just more control over the signal chain. Problem is I don't know if a cheap Behringer board would have a noticeable amount of noise and distortion.

Well adding +15 dB to a system that lacks bass does, our little 12 inch full range speakers don't have much oomph to them and when you throw 100 people and acoustics in the mix, it's not really an option.


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