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Noise... - Audio Enthusiast

About Noise...

Previous Entry Noise... Feb. 26th, 2009 @ 05:39 pm Next Entry
Having recently acquired a Behringer GEQ3102 for my system, I once again became familiar with the downside of EQs - white noise.
Given that this is a piece of professional equipment, it only has balanced I/O... So I opted to tap straight into the unbalanced internal wiring in order to pull out a signal and ground reference that I can actually use in a normal Hi-Fi setup (in the tape loop!). Okay, I need to add a buffer stage really, but for now this works.

And I've noticed something rather odd.
The noise is gone!

It seems that the balanced input and line driver stages were responsible for the majoroty of the noise the EQ produced. When you consider how many op-amps are inside it, that's pretty impressive. So why design such a quiet EQ circuit and then ruin it with such noisy I/O stages?

Sometimes, I think I'll never understand modern manufacturing practices.
Current Mood: curiouscurious
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From:coliningus
Date:February 26th, 2009 08:18 pm (UTC)
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Behringer ... is a piece of professional equipment

I think I found your problem.
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From:aydin_e
Date:February 26th, 2009 08:49 pm (UTC)
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Hah! XD

I know they've got a bit of a bad reputation for reliability, and I can see why, It does "feel" cheap... But along with that, the circuits and components they use are excellent (and respectably simple).

I'm sure anyone who was particularly paranoid about "only" using TL074s could find a way to "upgrade" them, but they are near-silent, very fast and very reliable. Same goes for the regulators in the power supply, and so on. Simple, tweakable, cheap.

Not to mention that there simply *isn't* anything better in "Hi-Fi" since graphic EQs arn't seen as "audiophile". The EQs that are sold as such are prohibitively expensive. This set me back £85 including postage...
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