posted
Same as a solid box with no leaks will hit better numbers. Colin
------------------ Spy Shots Warning SPL in my car exceeds government health guidelines, civilians are advised to proceed with caution. Failiure to comply may result in serious injury or death.
posted
What you are going for is Sound PRESSURE Level. If the cabin flexes less, less pressure is lost. If the cabin has no leaks, no pressure is lost through them.
------------------ rybaudio@freeze.com
The goal: Accurate musical reproduction in the mobile environment
Posts: 3957 | From: State College, PA | Registered: Sep 2000
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posted
Good point, SS, I kind of overlooked that. In my earlier comments I was talking about a vehicle where the subs are at the max, so any leaks could cause failure to them. Gummi, it sounds like you are in the category of underpowered. When you open the doors, the subs have less pressure on the front, and can therefor mover farther and increase displacement, increasing SPL.
Question for Shadow Star, would the doors being open also increase SPL because of more air movement by doors? Understand what I mean? Since the air could move in and out of the vehicle vs. being compressed and rarefied, would that increase SPL because of increased velocity? Am I leaving something out, or just don't make sense at all?
------------------ rybaudio@freeze.com
The goal: Accurate musical reproduction in the mobile environment
Posts: 3957 | From: State College, PA | Registered: Sep 2000
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Take a balloon, and blow it up 1 breath. How hard is it to blow up? Now, blow it up halfway. Now blow in 1 more breath. Which one was harder? The first breath, or the last?
When you open the doors, you change the compliance in front of the drivers.. Basically they can move easier, therefore displacing more air. I think if you actually look at the drivers, they'll be moving more.
This allows for greater displacement AND greater velocity.
ShadowStar
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Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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quote:Originally posted by Rybaudio: Gummi, it sounds like you are in the category of underpowered. When you open the doors, the subs have less pressure on the front, and can therefor mover farther and increase displacement, increasing SPL.
hmmm.... im only giving my subs 500W+ total..... im going to try with 1000W but my subs are designed to take 250w PEAK!....
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Posts: 274 | From: Göteborg, Sweden | Registered: May 2000
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Compliance of air in the cabin is one very important factor.
ShadowStar
yes its important, But I think it becomes less important when you have speakers that can more than do the extra work required to hit high SPL. My system is louder at the dash with the windows up, but it feels like it hits harder with them down. Funny thing is, It feels like it hits deeper with the windows down but according to my measurements it doesnt. I do have to add that Im still doing my experimenting with the good ole radio shack piece-o-$hit. so my measurements are only up to 120. thats as far as I trust it.
------------------ 2-DD 9512's 2-2000X's (for now) 8.0ft^3 box in a civic trunk One big ass port ?????dB's
It's not the size of your woofer, It's the size of the waves your woofer makes!
Posts: 1259 | From: Fullerton. CA ,USA | Registered: Oct 1999
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posted
Mr dank, I love your saying about the waves!!
On the topic, is opening a window or door cutting down on cancelation?
Reason I ask is because of my post also in this section. I'm all confused now....
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Clarion Pro audio DRZ715 JL 6.5 components crossfire 602 for components 2 12inch Audiomobile MASS subs 5 CU FT box 106 sq inches of port tuned to 51 HZ 2 Cadence A7HC's 2 optima red tops 160 amp Ohio Gen. Alt. 1/0 all the way around.
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