How do you find the Decibels (sound pressure) of a stereo system's speakers? here are the specs.?

Question:
How do you find the Decibels (sound pressure) of a stereo system's speakers? here are the specs. i don't know if you will need all of the specs, but here they are anyways...

I'm wiring one 12inch 4ohm dvc sub to a 2 channel amp sub is 2000watts/1000watts rms/amp is 1400watts/700rms?

Volts 120V at 60Hz
80 watts per speaker, (2 speakers) =160 watts
speaker size each- (Height x width x depth) 13 X 9 X 7.8 inches

How to install FM Modulator for iPod in 2003 Xterra?

thanks for those who help! :) have a great day

Answers:

How can I install a new style radio into an old 79 F-150?

You go to Radio Shack and buy a sound pressure meter and find out. But a tool that's much harder to find is called "The Educated Ear". It's a device that knows when "Too" loud is, and how much bass is enough. Most car systems are used as Hey look at me! attention grabbers, and that includes the police. You may laugh at this, but hearing loss is real, and doesn't always happen twenty years down the road.

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Channels bridged to a subwoofer?

You have to measure it with a microphone at 1meter. Its the only way. The specs are useless.

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What would be the best amp for Rockford Fosgate P3D4?

hey whats goin on i am slmost sure that autozone or oreillys or anyparts store may have one or even beable to order you a decibel meter

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