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<blockquote data-quote="John Halliburton" data-source="post: 43048" data-attributes="member: 8">Re: Question about headroom with dj mixersI inferred something, but I&#039;ll be explicit:&nbsp; the amp is not rated for full range(and low freq. especially)use in bridge mode at 4ohms.&nbsp; The power you&#039;re getting from it is more than likely not near the 2000watts it says in the manual, as that is a spec given for a 1khz tone.&nbsp; The amp may be quite good with an appropriate subwoofer, say one that will handle 2000watts continous at an 8ohm load.&nbsp; Even then, the manual states that the amp is limiting hf to 15khz(I know, not precisely related to low freq. use, but more an indication that it doesn&#039;t even really like 8ohm bridge mode 100%).Narrow the bandwidth on the Driverack to 33hz and 80hz, if the subs are crossing over to your tops properly, the kick drum shouldn&#039;t be suffering.Raising the high pass some will tax the amp less, hopefully making for better performance in this situation.&nbsp; I&#039;d experiment and raise it 1-2hz at a time, and listen with some favorite track and stop just below the frequency that you can hear a difference.Many are using a Crown iTech 8000 on a pair of 728s subs, about 4000watts/ch/40hms in stereo.&nbsp; Besides more power, the amp is being used in stereo mode, so overall performance is typically better/safer.Best regards,John</blockquote>

[QUOTE="John Halliburton, post: 43048, member: 8"] Re: Question about headroom with dj mixers I inferred something, but I'll be explicit: the amp is not rated for full range(and low freq. especially)use in bridge mode at 4ohms. The power you're getting from it is more than likely not near the 2000watts it says in the manual, as that is a spec given for a 1khz tone. The amp may be quite good with an appropriate subwoofer, say one that will handle 2000watts continous at an 8ohm load. Even then, the manual states that the amp is limiting hf to 15khz(I know, not precisely related to low freq. use, but more an indication that it doesn't even really like 8ohm bridge mode 100%). Narrow the bandwidth on the Driverack to 33hz and 80hz, if the subs are crossing over to your tops properly, the kick drum shouldn't be suffering. Raising the high pass some will tax the amp less, hopefully making for better performance in this situation. I'd experiment and raise it 1-2hz at a time, and listen with some favorite track and stop just below the frequency that you can hear a difference. Many are using a Crown iTech 8000 on a pair of 728s subs, about 4000watts/ch/40hms in stereo. Besides more power, the amp is being used in stereo mode, so overall performance is typically better/safer. Best regards, John [/QUOTE]

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