Ian Coughlin wrote on Fri, 20 August 2010 13:45 |
I know I can get an IT4000 and limit the RMS but that wouldn't be a rational decision
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Why not?
HF drivers need very low power from amplifiers with very high voltage rails. The logical solution is to limit for long term power so you don't burn up the voice coil, and provide a big enough amp to meet the excursion capabilities of the driver. An XTI 1000 is really pretty baseline in this regard, at least for good pro drivers.
Sorry if someone already covered this, I just skimmed the rest of this post.
P.S. Look at the impedance curve of your HF driver and think about just how much of that voltage is being turned into actual heating power, especially at the top end of the HF response. Not much!
P.P.S. For instance, here is a screenshot of the impedance curve for a 1" exit, 1.7" voice coil HF driver rated for 60W AES that I work with a lot. That driver is powered by an amplifier capable of delivering 330w to it. Up at the top of its response that amplifier would be clipping its rails pretty hard trying to deliver even half that.