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Post by dust770 on Mar 10, 2014 16:41:26 GMT -5
In another thread I saw someone who had calculated the headroom another member would get by switching to a different amp. I can't find the thread anymore but was curious how he calculated this. I'm currently using an Xpa-2 to 90db sensitive floor standing speakers from 9 feet away. This seemed to be the info he used to determine the headroom. I'm curious what upgrading to an XPR-1 would do to the same speakers in terms of headroom. Any help is greatly appreciated
Dustin
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jlafrenz
Global Moderator 
I don't want to jump in, unless this music's thumping
Posts: 7,722
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Post by jlafrenz on Mar 10, 2014 16:49:03 GMT -5
Here is a calculator that I have used to determine how much power is necessary for your listening level and distance. Not sure if it is exactly what you are looking for. www.crownaudio.com/elect-pwr-req.htm |
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geebo
Emo VIPs 
"Too bad that all the people who know how to run the country are driving taxicabs and cutting hair"
Posts: 24,203
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Post by geebo on Mar 10, 2014 16:50:54 GMT -5
In another thread I saw someone who had calculated the headroom another member would get by switching to a different amp. I can't find the thread anymore but was curious how he calculated this. I'm currently using an Xpa-2 to 90db sensitive floor standing speakers from 9 feet away. This seemed to be the info he used to determine the headroom. I'm curious what upgrading to an XPR-1 would do to the same speakers in terms of headroom. Any help is greatly appreciated Dustin You'd be going from 300 watts to 1000 watts assuming 8 ohm speakers. The difference is just under 6db more headroom from the XPR-1. Going from 300 to 600 yields 3 db. To get another 3db you have to go to 600x2 or 1200 watts. So I'd say around 5db more headroom. |
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Post by dust770 on Mar 10, 2014 17:23:50 GMT -5
Thanks guys that's exactly what I was after, much appreciated!
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Post by Gary Cook on Mar 10, 2014 17:54:16 GMT -5
Thanks guys that's exactly what I was after, much appreciated! I'm curious, now that you know you will have 5 db more headroom from a new amp how has that helped your decision making process? It seems to me that what's of first importance is how much headroom you have now with your current amp? If you listen at say 96 db (that's pretty loud, louder than a jackhammer at 50') you would be using around 15 watts. So currently you may well have 16 db of headroom. The question appears to me to be is 16 db enough headroom or do I need another 5 db? Cheers Gary |
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Post by dust770 on Mar 10, 2014 18:35:22 GMT -5
I guess I should add if I have the stereo cranked up to high volumes, say reference ,level will it always have 5db of headroom? Or does that decrease the louder you have your listening level?
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Post by dust770 on Mar 10, 2014 18:37:44 GMT -5
Thanks guys that's exactly what I was after, much appreciated! I'm curious, now that you know you will have 5 db more headroom from a new amp how has that helped your decision making process? It seems to me that what's of first importance is how much headroom you have now with your current amp? If you listen at say 96 db (that's pretty loud, louder than a jackhammer at 50') you would be using around 15 watts. So currently you may well have 16 db of headroom. The question appears to me to be is 16 db enough headroom or do I need another 5 db? Cheers Gary I think that ties into my next question above. I usually listen to movies fairly loud. Explosions and such would reach into the 105-110db. How would the headroom be affected at these volumes? How would I figure out my current headroom? |
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Post by Gary Cook on Mar 10, 2014 19:23:51 GMT -5
There are a huge number of spl/wattage calculators available on line, this is a common one www.hometheatrebasics.com/home-theatre-tools/spl-calculator/If you input your speaker sensitivity, number of speakers, their location in the room and amplifier wattage you end up at around 60 watts for 105 db, leaving say 10 db of headroom. The problem with explosions etc is that they are frequently handled by the sub woofer, so the headroom calculation for those effects would need to include the sub amplifier. Which frequently has many times the watts of the main speakers' amplifier. Cheers Gary |
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Post by Boomzilla on Mar 10, 2014 19:28:06 GMT -5
Here's my results:
30 dB Gain from amplifier
-11.3 dB Loss due to dispersion (distance)
3 dB Gain from sonic reinforcement (multi speakers)
3 db Gain from placement (reinforcement from reflected sound)
121.7 dB SPL at listening position
YEE HAW!!! LOL
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