I have been using the first generation 450s for over a decade and they're great. I ordered 2 of these - one showed up D.O.A. and the other has a decent hiss any time it was powered up (tried on several power sources to eliminate that possibility). Crutchfield immediately shipped a new one to replace the dead one. It showed up and had an even louder hissing noise! All three are going back and I'm ordering JBLs. So disappointed in Mackie now that they're under new ownership. The saving grace was the PERFECT customer service from the folks at Crutchfield. 100% no-hassle returns. They have earned my business forever.
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