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Multi-Way Conventional loudspeakers with crossovers

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Old 18th July 2008, 05:00 AM   #11
amo is offline amo  United States
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By loosing the eq i suppose you mean to rely on the sealed box attenuation of the low end, which you estimate to be at 80Hz, right? I guess thats what I am doing. The midbass on these is great, and will be even better when I finish lining the enclosures with solid oak on the inside and adding studio foam to really make it dead.

This realy is a fun project, and I am taking the easy route, using B&W 803 as a starting point and using chip amps with readily available PCBs, the only hard part will be replacing the passive XOs with actives from Rod Elliot, and that is not so hard after all. This is a large scale "test" and if it sonds good, I will have no choice but go with all DIY high end design, maybe 12 class-A "heaters" driving some enormous TAD subs and bass, with ATC mid thrown in for good measure Picking a tweeter will be fun too. Now THAT will be fun!!!!!!!!!!

One interesting thing I am finding is that first order slopes, as implemented in the 803 passive, require VERY SERIOUS matching of drivers, and often times, 4th order sounds way better, even when the drivers are wide-ranged. That is one thing I am trying to prove with this design as I take it from 1st and 2nd order to 4th.. Using 4th order and wide range, the XO points can be placed at strategic positions to not impact the phase at critical points. I am understanding that majority of drivers are just not beefy enough to overlay one another and still sound transparent.

Is first order XO over-rated
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Old 21st July 2008, 05:41 PM   #12
roger_lew is offline roger_lew  United States
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Location: Moscow, ID
The Adire AV8 in a sealed box with Q = .707 rolls off at about 80 Hz. Hard to say exactly where your woofer will roll off. It will depend on the box and the woofer specs. Best to measure.

Look forward to seeing it when it's done.
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