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148.2 db at 26hz Help?


BMS

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In sedans, for example, one may think that directing the ports into the cab would produce the greatest volume...but that isn't always the case.  Sometimes the ports facing into the trunk can result in the whole trunk acting as an enclosure of larger space and result in even louder volume.  Every car is different, and box design and speaker design.  Lots of variables in this.  This is where some of the art resides...finding out what works best in your car.

Orion XTR amplifiers

Skar subs

 

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Hi,

I am not a SPL master but think it all goes with physics at that level - subs need space to vibrate and available air to move. So having the hatch open may drive more free air in to the front of your woofers , 

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HU - Alpine - CDA-9887R

Changer - Alpine - CHA-S624

Amp - RF - R600x5

Front Speakers - RF - P165-SI + Alpine SPG-10C2

Rear Speakers - RF - P1650

Sub - RF - P2D4-10 on Vented Box 

 

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All cars are louder with a door open, with a window open or even 2 open. I think it's because when it's all sealed up with everything closed, the subwoofers are somewhat under pressure, limiting their movement. When you open a door, suddenly the subs are under less pressure and can move more, making them a little louder.

There's also that thing called "the hot seat", when the car is all sealed up on the passenger side with the door open on the driver's side. This way the passenger (victim) feels a lot higher dBs than the driver, making him jump out the car like the seat was hot. There are cars that do 160 dB all sealed up on the dash, but if you open a door and meter in the kick, the score goes up 3 dBs or more, the equivalent of double the RMS.

There's also this EXO video where JP's girlfriend broke Scott Bowman's golden rule, which is to never open the door at max volume, because the sudden change in pressure could make the subwoofers bottom out or unload, which would damage them.

 

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