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In Reply to: what is the best pro amplifier for horn subwoofer? posted by adkins on July 18, 2005 at 22:13:18:
nt
"Polarities are seldom aware of their polarness." Prospero
Follow Ups:
The standard for rating how efficient a loudspeaker plays is to send a tone into the driver with 1 watt, and measure the response at 1 meter. This measurement give you the Sound Pressure Level (SPL) at 1 watt/1 meter.
Once this is known, every time you double the power, you can add 3db SPL. Up until the speaker frys from power.Efficiency ratings are inportant since, if you know how loud the speaker can play with adequate power, you can figure out how loud it is going to sound in the room. This calculation is called the iverse square rule, where every time you double the distance away from the speaker, you lose 6db.
For instance:
Speaker plays 99db @ 1w/1m
Speaker can deal with 700w peak
You give the speaker 512w
So the speaker is playing @ 129db at 1m with 512w.
That means 100' back in the room, the speaker is producing 99db
That should get you through your rock show.
But people next to the speakers will suffer ...
Tom
....to give me some idea of the driver's efficiency. Thanks Ray
"Polarities are seldom aware of their polarness." Prospero
.
Tom
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