mmmmmtmmmmm question

[PrimaLuna]

Building a mmmmmtmmmmm array, of sorts. The sensitivity of the 10 woofers will work out to about 97. If I have a tweeter with a sens. of 90, is it better to bring down the sens. of the woofer line or find a tweeter with a sens. around 97? Can I do it either way, does it matter?

[grrr]

it is most of the time not a good idea to bring down the sensitivity of a woofer with resistors. A amplifier loses a lot of control over the woofer there will be a lot of boomy bass and it is nice to have a high sensitivity. So i think a nice horn tweeter will be nice. On the other hand nelson pass makes amplifiers that are current-sources because it reduces distortion in speakers so maybe bring down the sensetivety of the woofers will have some beneficial effect ? But you need to calulate it with your encloseure or go for a open baffle or something.

[grrr]

Or you can use less woofers in the middle freq and use all of them in the bass to compensate for bafflestep.

[edjosh23]

You can try a horn for the highs. Or try a bezel array for the tweeters, using something like these.

Good Luck,

Josh

[owdi]

With that many woofers you have some choices in how you wire them, giving you control in 6db intervals of the array of woofers. Instead of wiring the 8 woofers for a 4 ohm load, wire them for 16 ohms. You loose 6db, then pad the tweeter down. Also, don't forget the effects of baffle step when calculating efficiencies.

Dan

[johninCR]

You need a tweeter with at least a 103db sensitivity to keep up with the array of woofers. The reason for this is that the spl will decrease for the tweeter by 6db when you go from 1m distance to 2m, then another 6db from 2m to 4meters. The array of woofers on the other hand will decrease by only 3db going from 1 to 2m and 3db more from 2 to 4m.

A Bessel array of 5 tweets will be of little assistance because their sensitivity increase of multiple drivers is small because one of the double amplitude drivers is wired out of phase.