Boon Posted January 10, 2009 Report Share Posted January 10, 2009 Looking at another thread there was a bit of debate on how temperature can change your scores. For the sake of the argument, let's say that we're comparing a winter's day with temperatures around freezing versus a hot summer day. Considerations I have thought of: Air mass - cold air is more dense than hot air. Does this make much difference? Perhaps hot air is easier to 'flow' due to it's lower density. Electrical efficiency - lower temperatures mean lower resistance in your cables, amps and voice coils, making them more efficient. Chemical reactions - In particular the battery. Batteries make FAR less current when they're cold. This is probably the biggest and most measurable difference caused by temperatures. A battery with a CCA (CCA is measured at 15 degrees F I believe?) of 700A will probably do more like 1000A when it's warmer. This leads to a pretty big difference in the power the amp makes. So, what's everyone's thoughts on this? I'm guessing a lot of people will say it makes very little difference but look at the difference in horsepower from the engine of a top fuel drag car due to temperature changes - When you're pushing the limits of your equipment I bet it can make a reasonable difference. Quote 10.x volts fo' life! Link to comment Share on other sites More sharing options...
reinke Posted January 10, 2009 Report Share Posted January 10, 2009 it makes a huge difference. a few other db drag people will agree with me. my system is louder on a 70 degree day than on a 90 degree. but, i have noticed that my voltage is alot better after my truck sits over night right now. last night is was 19 degrees where i am. when i started my truck up i let it warm up. my voltage gauge read 14.7 volts. in the summer i am lucky if i see any higher than 14.3 when my truck warms up. Quote ----reference's---- meade916 Link to comment Share on other sites More sharing options...
bigbodylexus Posted January 10, 2009 Report Share Posted January 10, 2009 I've noticed that the cooler it is outside the better mine sounds, but then again I have always heard that heat is the enemy Quote 1990 Chevy Suburban (Big Booty Judy) (4) Sundown Audio Zv5 18's (1) Sundown Audio Salt 12K (1) Sundown Audio SAX-100.4 (1) Sundown Audio SAE-50.4 (2) Crossfire ST-1 Tweeters (2) Obsidian Audio ST-1 tweeters (4) Sundown Audio Neo Pro v3 6.5's Saving 2nd Bass Link to comment Share on other sites More sharing options...
Andrew2944r Posted January 10, 2009 Report Share Posted January 10, 2009 Heat plays a crucial role in alot of diffrent aspects of a vehicle or in SPL, to the Alts the subs, the amps and so on. As heat increases score decreases from what I have experienced in SPL Applications, for a Daily Pounder you will probally never hear or tell the diffrence. Quote Team Ampere Audio Link to comment Share on other sites More sharing options...
banginAltima Posted January 10, 2009 Report Share Posted January 10, 2009 My numbers are always down when its cold and hot. I get my best numbers around 65 to 70. I have heard that cold weather lowers your freq. but going down in freq. has never worked for me. The air can be too cold/dense and become harder to move with the same power. Atleast that is how a science professor explained it to me. Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
banginAltima Posted January 10, 2009 Report Share Posted January 10, 2009 it makes a huge difference. a few other db drag people will agree with me. my system is louder on a 70 degree day than on a 90 degree. but, i have noticed that my voltage is alot better after my truck sits over night right now. last night is was 19 degrees where i am. when i started my truck up i let it warm up. my voltage gauge read 14.7 volts. in the summer i am lucky if i see any higher than 14.3 when my truck warms up. An alternator performs better when cold. Quote If you build it, db's will come... NSPL World Record Holder Trunk 0-1800 watts---147.9 with 1722 clamped watts @ 40Hz(9-20-09). Competition Only Record Holder Trunk 0-500 watts---148.1 2006 Nissan Altima 3.5 SE Currently Rebuilding.... My 150db Plus Trunk Build I do box designs. [benH] 6:24 pm: clipping doesn't really hurt subs [benH] 6:24 pm: being an idiot is what blows subs Link to comment Share on other sites More sharing options...
E a r t h Posted January 10, 2009 Report Share Posted January 10, 2009 Temperature and altitude difference are probably worth a tenth or two on the meter And yes, you will have a higher voltage reading during cold start vs warm running. Quote Link to comment Share on other sites More sharing options...
uhoh_45 Posted January 10, 2009 Report Share Posted January 10, 2009 i know team riprock use a thermometer in there trooper because its loudest at a certain temperature other buddy brought a portable air conditioner to keep the inside of his vehicle cold for a show that was hot as hell Quote R.I.P! (Nov-29-2009) 92 explorer - 4 Atomic Apxx 15s duel .7s - 4rth order bandpass wall -4 powerbass XA-3000D's - 16 8volt batts wired to 16 volts - (9+/9-) runs 0gauge - 152.3 Db @ 29hz BUILD LOG current build 97 chevy lumina4 - 1 Atomic Apx 18 - 6 cube slot port trunk sealed off - 1 powerbass XA-3000D - 2 optima G31s in spare tire18 1 run 1/0 lumina build log Link to comment Share on other sites More sharing options...
HHR Ed Posted January 10, 2009 Report Share Posted January 10, 2009 extreme cars like team Riprock are a whole different animal. The tolerances are so tight that any change in humidity or barometric pressure can effect frequency and score. But in daily type cars its negligeable. You are more likely to see a decrease in score due to the effect of temperature on electrical system and equipment than any acoustical change, Just have to keep in mind to change your burp frequency to compensate. my testing chart here says. 80 deg F cabin temp, 73 deg F enclosure temp. = 38hz, 153.4 dB 65 deg F cabin temp. 62 deg F enclosure temp. = 40hz, 153.4 dB 50 deg F cabin temp, 48 deg F enclosure temp. = 42hz. 153.4 dB 40 deg F cabin temp, 40 deg F enclosure temp. - 43hz. 153.4 dB Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
BigPimpin91 Posted January 10, 2009 Report Share Posted January 10, 2009 I seem to experience massive cabin gain when it is hot inside... Quote BigPimpin91's Banging Music Link to comment Share on other sites More sharing options...
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