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Siemens U273b Boosts by 12db. Is that normal?
Old 1 week ago
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Siemens U273b Boosts by 12db. Is that normal?

Hi-

I just bought a pair of U273b. Regardless of it sounding amazing, it boosts the signal by about 12db at max..

Perhaps im not understanding the (only) 2 controls, but it looks like input(or threshold?) and release... any idea? thought?
Old 1 week ago
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IIRC it should be 10dB by factory default. The boost is intended as a fixed gain makeup.
Old 1 week ago
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Originally Posted by jensenmann View Post
IIRC it should be 10dB by factory default. The boost is intended as a fixed gain makeup.
Well it affects the reduction to my ears so it does not sound like a post compression make up to me…is it really post process?
Old 1 week ago
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It´s a feedback compressor. It´s sidechainsignal is taken from the output of the compressor. That way the amplifiers gain will affect the sidechain signal level.
Old 1 week ago
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Originally Posted by jensenmann View Post
It´s a feedback compressor. It´s sidechainsignal is taken from the output of the compressor. That way the amplifiers gain will affect the sidechain signal level.
Got ya. Well, many feedback compressors, including the API's don't just add gain at the end of the process. Is there an attenuator missing? it don't make sense considering it was mostly used as the final stage at broadcast...was it adding 10db to the program material? im not sure where an attenuator is supposed to come...
Old 1 week ago
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I think it makes most sense in (vintage) broadcast as it is. Back then (60s) there were strict inhouse rules about levels. Tweaking to taste was not yet invented, at least in Germany. Engineers had to follow these rules. That meant that the limiters were set to a certain threshold and engineers fed them with a certain input level, so the result would be a certain amount of compression/limiting, hence a certain loudness and output level.
We don´t work this way anymore, don´t we....

Btw, I have a part of a Siemens white paper in english about these, not sure if U273 or a or b version. Let me know if you want to have it.
Old 1 week ago
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Quote:
Originally Posted by jensenmann View Post
I think it makes most sense in (vintage) broadcast as it is. Back then (60s) there were strict inhouse rules about levels. Tweaking to taste was not yet invented, at least in Germany. Engineers had to follow these rules. That meant that the limiters were set to a certain threshold and engineers fed them with a certain input level, so the result would be a certain amount of compression/limiting, hence a certain loudness and output level.
We don´t work this way anymore, don´t we....

Btw, I have a part of a Siemens white paper in english about these, not sure if U273 or a or b version. Let me know if you want to have it.
Hey Thanks. Sure, would love to see it if ou have a photocopy!
Old 1 week ago
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