Thanks, I have no problems with bi-amping, to be Honest I much prefer active crossovers/biamping to passive.
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If I was going to do a custom rig like yours, I’d do it like they do with home speakers, not like they typically do with bass cabinets. With bass systems, they typically have the big driver running full range and handing off the upper frequencies to the smaller drivers. What I’d do is run the small drivers as low as they’d play, then hand off the lower frequencies to the large driver. Naturally, this will require bi-amping with a good electronic crossover.
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That sounds like a good idea, I could set out the amp to have a selectable crossover so a 15" cab can be added at a future date. Only problem with that is I didn't really want to build three poweramps for the one head, just two. I suppose I could have a pre out that is low passed, then just add a third amp when using the 15.
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I believe large full range drivers are available aren't they? I'm thinking those who do the Open Baffle type systems.... they use full range 15" drivers. Could you use those okay?
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I could use those, but even the best built 15" drivers will suffer cone breakup after 1-2Khz. In some cases they barely make it to 1Khz before breakup can be measured/heard.