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Post by mrholmes on Aug 12, 2015 5:25:48 GMT -6
RGOs. Is this noise level normal for a console when the pick up amp of the two bus is at its limit?  Thanks. Holmes. |
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Post by EmRR on Aug 12, 2015 7:47:42 GMT -6
Not enough information. Inputs loaded or shorted? Or anything assigned to the mix bus? Anything inserted? etc.
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Post by mrholmes on Aug 12, 2015 8:02:11 GMT -6
Not enough information. Inputs loaded or shorted? Or anything assigned to the mix bus? Anything inserted? etc. All line inputs loaded from an audio interface outs, one compressor inserted one send/return active. I switched off the compressor which changes near to nothing.... When I switch off the return it lowers the level just a tat. Is that noise level normal??? Or too much?? |
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Post by EmRR on Aug 12, 2015 8:42:01 GMT -6
Also hard to tell what the analyzer settings 'really' are, it looks like it's peak/instantaneous, which is probably about 10dB more than an RMS or long settling reading. The envelope timing is a huge question mark when combined with peak/instantaneous. Assume dBFS? The number is meaningless without knowing that and what the 0dB reference to FS might be. Do you hear any problem? The hump below 300 does look strange, and could be indicative of a problem.
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Post by svart on Aug 12, 2015 8:59:32 GMT -6
Looks pretty normal for a live console to me. They aren't usually built to have lower noise, since they are just live consoles.
In any case, measuring noise is partly a crapshoot, especially when using consumer equipment like soundcards as the acquisition device. Computers rarely have good ground noise to begin with, and this greatly affects the measurements, especially when attaching to other equipment.
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Post by mrholmes on Aug 12, 2015 9:55:23 GMT -6
Also hard to tell what the analyzer settings 'really' are, it looks like it's peak/instantaneous, which is probably about 10dB more than an RMS or long settling reading. The envelope timing is a huge question mark when combined with peak/instantaneous. Assume dBFS? The number is meaningless without knowing that and what the 0dB reference to FS might be. Do you hear any problem? The hump below 300 does look strange, and could be indicative of a problem. Yeah in low passages it sounds like tape hiss, and the A+H sounds best when not pushed hard at the inputs. I ask myself if a tech could do something about it, which is affordable, to lower it? I like the sound of this cheap mini mixer I hate hiss... |
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Post by Deleted on Aug 12, 2015 9:58:24 GMT -6
From just what can see, there is some hum that is prominent.
This may come from the transformer. From my experience, this is mostly the case if the hum is prominent in the 50Hz area, while 100Hz peak (and 200/400hz overtones) mostly refer to grounding problems. Just happened to resolve such a grounding issue in my console's psu lately. But all in all, i'm not sure if this really indicates a problem of something beeing broken...
Hard to say if the noise figure is within the design's normal specs or not without additional information. See above comments.
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Post by mrholmes on Aug 12, 2015 10:05:50 GMT -6
From just what can see, there is some hum that is prominent. This may come from the transformer. From my experience, this is mostly the case if the hum is prominent in the 50Hz area, while 100Hz peak (and 200/400hz overtones) mostly refer to grounding problems. Just happened to resolve such a grounding issue in my console's psu lately. But all in all, i'm not sure if this really indicates a problem of something beeing broken... Hard to say if the noise figure is within the design's normal specs or not without additional information. See above comments. A+H gives no specs out for their cheap zed line, do not ask me why otherwise I would post them. Would an external PSU change anything about it? |
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Post by Deleted on Aug 12, 2015 10:16:59 GMT -6
Could well be, but does not anything about poor local decoupling and stuff like this.
Maybe it reduces low frequency noise/hum but not sure about the hiss you dislike...
Also not sure the results will be worth the cost of building or purchasing an external PSU....
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Post by mrholmes on Aug 12, 2015 12:13:30 GMT -6
Maybe I should not care too much about it as long the mastering geeks do not complain.
Some of them like the sound very much, so maybe its one of those things I should not worry too much about.
I guess some of the tape hiss of yesteryear was way more audible than this.
BTW whats the German word for decoupling?
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Post by Deleted on Aug 13, 2015 18:22:32 GMT -6
Entkoppeln. Bezieht sich auf Entkoppelkondensatoren...local decoupling: Entkoppelkondensatoren im direkten Umfeld von ICs/Opamps, die die voltage rails außerhalb der PSU stabilisieren....
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Post by gouge on Aug 13, 2015 18:51:34 GMT -6
something seems out of whack to me.
the noise measured is in the bass region. but hiss is high frequency noise. it could be the hiss is related to the monitor circuit driving the outputs which i don;t think you are measuring here.
I would guess some new caps and better opamps would make a difference??
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Post by mrholmes on Aug 15, 2015 9:51:34 GMT -6
something seems out of whack to me. the noise measured is in the bass region. but hiss is high frequency noise. it could be the hiss is related to the monitor circuit driving the outputs which i don;t think you are measuring here. I would guess some new caps and better opamps would make a difference?? Yes maybe, it was not that strong the day the "console" was new. I will show it to my tech and let him make suggestions. If he can mod it for under half a grand it still would be cheaper than buying it new. |
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