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Post by bluenoise on Aug 12, 2016 11:01:38 GMT -6
Hi guys, I'm making my own 500 series rack. I was going to calibrate its voltages and I'm not sure whether to compensate or not for the 0,7v drop. Should it be 16v and operate at 15,3v or should I set it to 16,7v? It might not matter practically, I just wanna get smarter  Thanks! |
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Post by svart on Aug 12, 2016 12:53:30 GMT -6
I don't think it matters much. I run mine at +/-17-ish because that's the supply voltages I had. They measure maybe within 0.5V of each other. 0.7V would be a fraction of a dB difference.
Honestly I wouldn't worry too much.
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Post by bluenoise on Aug 12, 2016 22:13:56 GMT -6
Thanks svart! I thought it could not make that big a difference.. I got curious as to what was the proper way to do it... |
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Post by unit7 on Aug 18, 2016 10:42:58 GMT -6
From CAPI's assembly guide for their PSUs: I go 0.5V high for the 48V rail and 0.7V high for the remaining rails. This will help compensate for the forward voltage drop over the protection diodes that are commonly used on the individual modulesPerhaps jsteiger could chime in.. |
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Post by rocinante on Aug 18, 2016 11:59:42 GMT -6
Just do + -15v and it will work fine and you'll feel safe. A few people power their 500 racks with + - 17v soundcraft power supplies so im sure your good.
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Post by dandeurloo on Aug 18, 2016 16:02:13 GMT -6
It all depends on the modules that go in it. If you know for fact that they can handle over +-16v's then the extra headroom is not a bad thing. Otherwise, do what rocinante said and play it safe. |
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Post by bluenoise on Aug 21, 2016 19:11:44 GMT -6
It will be mostly capi and api stuff. I'll leave them at 16 v then. Thank guys!
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Post by guitfiddler on Aug 31, 2016 8:59:45 GMT -6
Is there a lot of difference between 500 series rack supplies vs. DIY? Neve, Api,and many other brands now... I have a newer Api lunchbox with the Db25 connectors, it took me a longtime to go 500 series from 19" because I just thought that a unit having its own supply is just better than many different brands sharing the same supply. Then again this gets into another debate whether 500 series is better than 19" rack equivalents. Is it possible if I build my own PS, using good parts would it be better or just the same? Do better supplies equal better sounding units?
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Post by tasteliketape on Aug 31, 2016 12:27:58 GMT -6
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Post by EmRR on Aug 31, 2016 20:39:07 GMT -6
Can't give more headroom, voltage is responsible for that, but possibly lower noise. |
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Post by tasteliketape on Aug 31, 2016 20:49:22 GMT -6
I know better than to get in these threads lol sorry guys it was noise ,but here is Dan's quote
"I currently have one of mine them hooked up and filtering my radial rack and it's PSU. It made a difference. I even measured about a 10db difference in noise reduction by using it. That across all your modules makes a difference. It is a pretty easy improvement. If you have a radial rack or a API rack, these could be a nice simple improvement. It is not sex but it does make a difference."
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Post by rocinante on Sept 1, 2016 6:55:02 GMT -6
We underestimate how much a psu effects a piece of equipment becsuse its not in the audio path, but ask any Neve guru and they'll say its one of the more important parts. Ive read several times now that a clone just didn't sound right until they 'fixed' the powerr supply. I believe its PRR who said: "it all matters". Now dont ask me what neefs to be done cause I haven't a clue, I'm just repesting what I've read.
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Post by dandeurloo on Sept 1, 2016 7:37:41 GMT -6
I mentioned noise because that can be measured. Many people only care about specs. But I heard a improvement in depth, freq response and transient response as well.
I use mine with my Raidal rack, and a few of Jeff's CAPI racks and my PSU with my DC filtering pcb's. Which, I will have kits for and external PSU boxes very soon.
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Post by guitfiddler on Sept 1, 2016 11:33:54 GMT -6
I mentioned noise because that can be measured. Many people only care about specs. But I heard a improvement in depth, freq response and transient response as well. I use mine with my Raidal rack, and a few of Jeff's CAPI racks and my PSU with my DC filtering pcb's. Which, I will have kits for and external PSU boxes very soon. Over the years I have noticed that everything matters within the chain. It seems to apply to everything. When I build a computer, I start my BOM with a solid powersupply that is stable. Many people buy expensive parts, but slack on the powersupply. It's what keeps all the components healthy and working effortlessly. I figured the same is true for other powersupplies in other areas. Yes, I do believe this is true and wish I could test a few different ones to analyze with a conclusion, but don't have the time right now. Time constraints always seem to get in the way. |
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Post by bluenoise on Sept 13, 2016 8:57:57 GMT -6
Amazing how a silly question turned into something bigger. That's the beauty of this place. Thanks a lot for everyone's input
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