Ok, I have a Blueprint 1803 subwoofer driver. It has a 3" voice coil and is supposed to handle 1kW constant.
What I would like to know, is the power compression of the driver? At what point do I start loosing the 3dB per doubling due not to BL/excursion, but heat buildup?
First, I need to understand exactly what power compression is. I do know it is heat related. But, say the driver has been sitting for 2hrs not used, and then I apply a 2kW sine to it for a fraction of a second, high enough frequency so that the BL nonlinearities are not as much an issue. Lets say that the power compression at 1kW is 3dB. So while the driver is 92dB at 1w/1m efficent it should produce 122dB. BUT, with power compression, it will only produce 119dB. If I want 122dB, I will need 2kW, correct?
Is power compression related to the long term heating of the VC and motor, or does it apply to even a short fraction of a second burst?
RC, when you put 20kW into some of those woofers to test them, what kind of power compression do you typically get?
Thanks! [img]smile.gif[/img]
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