| Subject: Re: Finals is set!!!!!!!!!! |
Author:
Sayar
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Date Posted: 04:25:22 10/16/05 Sun
In reply to:
Sayar
's message, "Re: Finals is set!!!!!!!!!!" on 00:34:25 10/14/05 Fri
Sorry I got a little carried away before :(. Sometimes cold weather can help. But, in all fact it depends on the vehicle and install. Sound Pressure is all about compression. The louder your system is the more you compress air. That’s how the Term-Lab meter reads SPL. It does not actually read the amplitude of the waveform produced the speakers. It meters the amount of acoustical pressure the subs make. That’s what I was trying to get at. Now there are advantages of cold air. The primary advantage is that when a voice coil is colder the windings on the coil reduce in impedance. It is because of the lower impedance in cold weather that you will get more power from your amplifier. Additionally, amplifiers generally produce slightly more power when cold versus hot. When things get cold they stiffen and cause the resonate frequency of your vehicle to change slightly. Sometimes the change can be to your advantage sometimes they are not. I was able to contact some of the people I listed above. I was not able to contact all of them so I asked some of my other audio friends.
Chris: Depends on several things... your sub/box sometimes cold will stiffen your subs and make them play closer to the tuning of your box... sometimes heat will loosen your subs and have the same effect... sometimes cold weather makes your car's body panels more rigid and shifts the car's res. freq. There are too many variable to simply say that cold or hot is always better... the only way you will know is to test it.
Friend: Well the thing with hot and cold air is it changing the speed of sound. colder air is more dense and the speed of sound will drop, while hotter air is less dense and it will increase.
Friend: In really, REALLY high-quality installs where they calculate wavelengths and all reflections and all that, changes in atmospheric conditions change the speed of sound which throws all of the calculated wavelengths off, and that has an effect...as well as affecting the compressibility of the air
Tommy: Just to let you know everybody I know on the east coast SPL increases drastically with heat and humidity the hotter and more humid it gets the higher our scores go. But like you said its all what we "THINK" and your right it does depend on the vehicle. Tell ya what I will look up the winners from last years finals and post who had more wins EAST COAST or west coast. :) in the end it all depends on the install. Every install is different.
Frank: This is my favorite misconception. Humid air is actually less dense than dry air, because water vapor is lighter than air. To us crazy humans it SEEMS like it is more dense but in point of fact it is actually less. Don't believe it? Look it up. Temp, and A/P will def affect your SPL. When it is hotter, the A/P pressure is higher so pressurizing the air more would read higher on a pressure sensitive mic. So if you were at 26.8 in/Hg your score would read differently and possibly lower than at 29.9 (Denver Vs Miami). Same holds true with temperature and density altitude. So, if the air were more dense it would be harder to move thus creating a lower number..make sense? Ah but there is a problem, if it is more dense it is heavier but if it is less dense then there is less pressure to pressurize so then wouldn’t we want a perfect median atmospheric pressure at a high temperature?? In all truth warm air generally has more of what you could call "pressure potential" but it all depends on the room or car in which the sound is being monitored.
So, as you see it all depends. I have noticed that almost every vehicle I have metered produces higher SPL levels in the summer. But, from cost to cost most high SPL (150 dB. +) competitors say they do better when its fairly cold out but, not around here for some reason. I was talking to the area's high SPL competitors about this topic and they all said they do better in the summer. Bruce Duffner, Crag Paul, Randy Fornier... they all expressed that they had more on an advantage in the summer. You seem to be the only high SPL competitor around here that does better in the winter :).
So in the end it all depends... :(
I don't think that I properly got my point across in my first post. I made it sound like warm air always helps. That’s not what I was trying to say. Just something to feed your brain. :)
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