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Re: Question about headroom with dj mixers

First, my apologies, the spec where filtering bandwidth >15khz is on the MPA1100.

Ah, 1700watts average power into a subwoofer cabinet that can literally suck that amplifier dry, especially with the use you're giving it. As an experiment, perhaps you could take each of your 750 amps in bridge mode, and run one 728S(one amp per driver). The amp will do 1500watts/8ohm/20-20khz at that setting. Leave your DSP settings for the high pass at 31hz, but I'd still lower the crossover point from 100hz down closer to 80hz. Also, have you time aligned the subs to the tops, and double checked polarities?

There are other options besides an iTech 8000. Just adding two more MPA750's and dedicating one in bridge mode to each driver of the pair of 728S cabinets would probably do the trick.

Best regards,

John

<blockquote data-quote="John Halliburton" data-source="post: 43054" data-attributes="member: 8">Re: Question about headroom with dj mixersFirst, my apologies, the spec where filtering bandwidth &gt;15khz is on the MPA1100.Ah, 1700watts average power into a subwoofer cabinet that can literally suck that amplifier dry, especially with the use you&#039;re giving it.&nbsp; As an experiment, perhaps you could take each of&nbsp; your 750 amps in bridge mode, and run one 728S(one amp per driver).&nbsp; The amp will do 1500watts/8ohm/20-20khz at that setting.&nbsp; Leave your DSP settings for the high pass at 31hz, but I&#039;d still lower the crossover point from 100hz down closer to 80hz.&nbsp; Also, have you time aligned the subs to the tops, and double checked polarities?There are other options besides an iTech 8000.&nbsp; Just adding two more MPA750&#039;s and dedicating one in bridge mode to each driver of the pair of 728S cabinets would probably do the trick.Best regards,John</blockquote>

[QUOTE="John Halliburton, post: 43054, member: 8"] Re: Question about headroom with dj mixers First, my apologies, the spec where filtering bandwidth >15khz is on the MPA1100. Ah, 1700watts average power into a subwoofer cabinet that can literally suck that amplifier dry, especially with the use you're giving it. As an experiment, perhaps you could take each of your 750 amps in bridge mode, and run one 728S(one amp per driver). The amp will do 1500watts/8ohm/20-20khz at that setting. Leave your DSP settings for the high pass at 31hz, but I'd still lower the crossover point from 100hz down closer to 80hz. Also, have you time aligned the subs to the tops, and double checked polarities? There are other options besides an iTech 8000. Just adding two more MPA750's and dedicating one in bridge mode to each driver of the pair of 728S cabinets would probably do the trick. Best regards, John [/QUOTE]

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