Amplifie gain and limiter calculation |
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malina
Registered User Joined: 30 October 2008 Location: Croatia Status: Offline Points: 190 |
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Posted: 05 June 2011 at 7:05pm |
I have 2x Mt122 and 4xCSD 1200/15B I power my MT's with EV Q66 for highs and Q1212 for mids. I would like to know how to set gain and limiter on DSP to protect my drivers and get proper performance out of them. DSP is Dynacord DSP260 (or EV DC-ONE it's the same). MT's are loaded with B&C DE85 and 12NDL76. I know I'm asking alot but every help is welcome. Thanks in advance. |
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AndyWave
Registered User Joined: 30 March 2008 Location: Finland Status: Offline Points: 380 |
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Hi
You can calculate output voltage beforehand when you know amplifier voltage gain and input voltage. This doesn't take account the voltage drop when load (loudspeaker) is connected. This way you have some starting point for setting limiters. Decibel calculations are bit tricky because of the logarithm involved. I usually measure amp output voltage with pink noise and calculate rms power at 'speakers impedance minimum (driver mounted in enclosure, not in free air), then same all over for peak power with some percussive test track and measure amp output voltage with multimeter peak hold on. P=u^2/Zmin I use both pink noise and signal with high peak content to see/hear how the limiters are actually limiting. Always start with lower limiter treshold than needed and measure few times, gradually working towards higher power levels. edit:Amp gains set to maximum if hiss or noise isn't problem. (so any curious person can't turn them up after your limiters are set) Andy Edited by AndyWave - 13 June 2011 at 4:02pm |
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torturing electrons since ......
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Reckit
Registered User Joined: 15 June 2011 Location: UK Status: Offline Points: 10 |
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Hi Malina
I have all the calculations you need in an XL document. All you need to do is type in the values and it spits out the answers. Not sure how to upload files on this forum so if you let me know your email address I can forward it on |
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TechnoChef
Registered User Joined: 23 April 2009 Location: Oxfordshire Status: Offline Points: 1109 |
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Reckit, welcome!
I would be very keen to make use of this spreadsheet! You won't be able to upload an xls file direct to the forum, but filesharing sites are freely available and simple to use. I'd personally recommend http://www.mediafire.com Signing up takes but a moment then, once uploaded, a link to your file(s) can be copied to the forum... |
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I think I'm in love with your mum.
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FlipC
Young Croc Joined: 25 October 2007 Status: Offline Points: 654 |
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Frak email it to me and I will share it on my server.
flipc AT wcsquad.com That would be nice to have! Edited by FlipC - 15 June 2011 at 7:00pm |
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Happy Jack
Registered User Joined: 16 February 2009 Location: London Status: Offline Points: 95 |
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I'd put money on that .xls being the first link below! Points to Google Docs where they can be downloaded. Limiter Calculator - Edited by Happy Jack - 15 June 2011 at 7:25pm |
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Reckit
Registered User Joined: 15 June 2011 Location: UK Status: Offline Points: 10 |
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not the same as yours happy jack but thanks for the link. however if anyone wants the one I have, click on the link below
http://www.mediafire.com//1gq1k4osul7v4w2/Audio%20Calc.xls - http://www.mediafire.com/file/1gq1k4osul7v4w2/Audio%20Calc.xls
Edited by Reckit - 16 June 2011 at 11:29am |
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Reckit
Registered User Joined: 15 June 2011 Location: UK Status: Offline Points: 10 |
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http://www.mediafire.com/?1gq1k4osul7v4w2 - http://www.mediafire.com/?1gq1k4osul7v4w2 sorry I will get the hang of this
Edited by Reckit - 16 June 2011 at 11:23am |
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FlipC
Young Croc Joined: 25 October 2007 Status: Offline Points: 654 |
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I also put it online
http://www.worldconspiracy.org/speakers/Audio-Calc.xls Will check out the other 2 also. |
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malina
Registered User Joined: 30 October 2008 Location: Croatia Status: Offline Points: 190 |
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Thanks. I will look into it. Has anyone tried one of the above? |
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Malina Audio
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