Posted by Wayne Parham [ 151.193.213.23 ] on March 17, 2006 at 10:24:48:
In Reply to: l-acoustics power ratings mtd115a posted by steve on March 16, 2006 at 06:48:00:
Looks like great stuff. I have no experience with that particular brand, but I do have experience with sound systems in general. I'd suggest that since the HF driver doesn't require nearly as much power (nor can it handle as much power) that 600W isn't necessary for the compression driver. The woofer could probably use that much power though.
There is one more thing to consider, and it is probably more important to you. This is why you might want to run 600W or 700W amps on both high and low frequency sections. The impedance of the HF unit rises above 1kHz, and so power dissipated by the driver is less than you would expect for a consistent 8Ω load. So you could use an amp rated at 600W, even pushing it to its voltage limit and not really be dissipating 600W into that driver. Therefore, while the driver's thermal limits would probably be far exceeded by a 600WRMS signal at 10kHz, you wouldn't be pushing it at 70VRMS. If the driver were a purely resistive 8Ω load, these two figures would be the same thing. But since the tweeter is about 50Ω at 10kHz, 70VRMS is actually only dissipating 100WRMS, which is probably safe for the tweeter. For that reason, you might want to use a 600W amp, just to make sure it has the voltage drive you need.
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