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- blue934 12:26AM
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DIY Bluetooth Work Radio
Looks and weight department are not what I was hoping for but fingers crossed, sound quality will make up for those shortcomings.
Mids and tweet are the nd91+nd16fa. Originally wanted one good ~5'ish" sub but bought a pair of 10" grs-he for another project leaving a pair of sd215-8 woofers sitting unused. Might as well put one of them to use. The nd91/nd16fa are driven by a kabd-230 2x30w, which, fingers crossed, will feed a second kabd-230 with both channels driving both vc of the sd215. It will be excellent if both kabd boards play nice together as their voltage requirement works out well with 18v Milwaukee batteries. If they don't play nice together, the second board may get replaced with an aa-ab32361 Sure board currently sitting on the speaker hording shelf. The Sure board needs 15v-36v which leaves me thinking it may need a boost board before it supplies much wattage to the sub.
The kabd-230 have two channels at 30w w/dsp, and a pair of line outs which also have dsp. Makes it easy enough to add another sub board without the worry of a crossover.
Grills for the tweet and mid are chrome fan covers. Have a bar grate for the woofer, but it looks kind of meh. May go a different route.
Crossover for the nd91/nd16fa.
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Comments
XSim
Measured around 1 meter ... more or less. Wondering if the squiggles below ~1k are from interactions due to the short distance between drivers?
The nd91 are sealed in ~2L. They really want ported but to many holes in an already busy box and the sd215 easily plays high enough to meet them wherever needed.
The sd215 wound up with ~13L/.45ft³ tuned to 45hz with 2 1.25"x6.15" ports. F³ of 45hz. Not the flattest response, but I'm thinking that +3db hump will never be noticed in a noisy work environment, and maybe even needed. If it's too much, then we have dsp. @27m/s, vent velocity is fairly high @30w, but I'd wager it would have to get a magnitude more severe to be noticed at work. It's already way better sounding than all the other beat boxes I've heard at work.
F³ of 51hz if the ports are sealed.
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I wouldn't worry about the hump at all. in a smaller space it will be punchy. In a big space it will reinforce and keep it from seeming anemic.
SigmaStudio is kool.
Modified a basic Dayton 2 channel design. Think this is everything needed to crossover to the mid/tweet and correct anomalies. If woofer phase adjustment is needed, their looks to be a fairly complicated way of using Hilbert transforms to continuously adjust phase. Too bad you couldn't just add a block and go just like all the other stuff.
@Ed_Perkins. It looks like both kabd have the same bluetooth connection. Both connect or nothing. Looks like I'll have to go another route with the second amp.
Both boards connecting to bt really messed things up. Pulled the second board and put the sure ab32361 in its place. No eq on the mid/tweet and crossing the sd215 around 68hz @12db. Seems too low but sounds pretty good. I'll connect the pc and do some fiddling with settings and phase when time allows, but this driver combo sounds very promising.
Has anyone built a 3-way using the sd215/nd91/nd16fa? If not, I'm thinking that's going to be my next build.