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Symetrix 425 Dynamics Plugins
Old 3rd February 2008
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layez's Avatar

Thread Starter
Symetrix 425

Does anyone else have one of these? I've had mine for a while and have used it for kick, bass, snare, and acoustic gutiar. I was curious as to the specific applications that others use it for. I think it's a decent compressor.. i dont know how it stands next to the 501 as ive never used it.
Old 6th February 2008
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layez's Avatar

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maybe this should be in low end
Old 6th February 2008
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James Lehmann's Avatar

I had a pair of 425's for ages.

They were perfectly nice compressors for certain jobs (I found keyboards well-suited) but in the end their lack of character (partly due to the absence of an attack control) meant they were seeing limited use in the studio and I sold them.

I could see them finding a good home in a live rack - the expander section can really help mask noisy gear.
Old 4th July 2009
Gear Addict
echoclerk's Avatar

Symetrix 425?

I just got an offer on a couple of these for cheap. I am short of compressors so thought it might be handy.

but its really quite hard to find any info on them on the internets.

Anyone know anything about these?

should i pick one up for 50 quid or just let it go?
Old 6th July 2009
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echoclerk's Avatar

Old 6th February 2010
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Big_Bang's Avatar

Bumping this for reference...

I was digging around since I have 3 pairs. I haven't used them much in studio, actually never I think, but what I can tell you is that every single time I used them live, I was blown away with the efficiency of both compression and expander/hysteresis. It is a total feedback eliminator without cutting a hole in the freq range. Very effective.

It can be made to pump extremely easy, maybe too easy on some material, but in a very musical un-mudded way. Plus, you can do anything via sidechain.

VCA's are said to be the same as the revered DBX160, which makes it a favourite with bassists and low end tightening. A very very complete unit, although no attack, you can compensate with release on expander. Plus you can really push thing into the limiter.

Come to think about it, this could very well be a dirty cheap harware mix buss

I actually have them in the studio, I think I'll patch them up and play around a bit
Old 18th March 2010
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Big_Bang's Avatar

Been playing around with these in studio... amazing what good clean AC current does for your gear...

These pups are WAY better than I recalled!! Clean, to the point, highly effective! (like WOW better than I expected really!!)
I really go to patch them up and do some serious further testing!

Its almost as I had just bought 6 great slutty new outboards, this is how excited I am about these!

(well, only tested one so far, but as there are no tubes... I expect some level of consistency)
Old 18th March 2010
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camus's Avatar

I haven't used mine in years, but the expanders on these as far as I can recall, were the best things about them. Hmm.. maybe I should go digging and fire it up again...
Old 19th March 2010
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James Lehmann's Avatar

Originally Posted by Big_Bang View Post
It can be made to pump extremely easy...
I agree with you on most everything else about the 425 (see my earlier post) but man, I could never make these things pump satisfactorily! How do you do it with no attack control?
Old 19th March 2010
Lives for gear
Big_Bang's Avatar

Easy, just drive it hard into the limiter and pulll back completely on hysteresis!

But the real trick is the "ADSR" you feed into it too. I was messing about with some heavy beats and distortion. It can pump even without sidechaining (obviously misses the point, but make a new one).

Its not a gate, so it pushes back on threshold and violently pushes it up forward coming back up again.

Old 14th May 2010
Lives for gear
Big_Bang's Avatar

Low end, shlow end !

Is a sm57 low end because of price? heh

I've found out some relevant info!


Pro Audio Design Forum • View topic - Symetrix 425 Manual

a guy repairing one of these units says

" It uses a CA3046 transistor array as a detector with both log peak and log average outputs. It's very similar to the Blackmer RMS topology (without squaring) and uses a 2150 VCA "


... now off to translate this into plain English...
Old 8th February 2018
Here for the gear

Just to add to this great info... I've started using a 425 for voiceover. Commercial and animation. Super clean and it helps me keep my levels in check when actors go from whispers to screams. Rarely hear it working, again just super clean. Great for utilitarian compression and limiting without coloration of the signal.
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