So whom here in speakerdudeland has experience with the Dayton KAB boards. I bought two KABD4100’s for my Tripod speaker project. I suck at digital crap. And I’m always gonna suck, because of my attitude about it. I am a raw materials kind of guy. So I am looking for a coconspirator. Someone to do the smart stuff and I will do the other stuff. I am phrasing it this way so that I am not inundated with offers. I had to ask my wife how to spell inundated. Because she let me. — MAC/DIY
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I used the KABD-430 for the 2-ways I brought to Iowa this fall. I’m working on a post about using the KABD board and programing it with SigmaStudio. I started on the post in October and maybe this will jump start me to finish it.
I’ve used SigmaStudio in several different projects using the Sure/Wondom/Dayton boards. You may want to consider a hybrid approach. After you take your measurements (the most important part!) you can use VituixCad (VCad) with its active filter blocks. If this design turns out to be a group collaboration, you’ll get more participation using VCad than SigmaStudio. And it’s easier to tweak values and see their results in VCad than SigmaStudio. Once you have the design in VCad it’s easy to duplicate in SigmaStudio. I could certainly help you with that.
Concerning measurements: I would like to hear how others would measure the dual, side opposing woofers.
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Thanks Ed. I previously noticed a big dip around 170 and attributed it to the dual opposed configuration, so I was thinking of actively crossing at 120 and adjusting the subwoofer level by ear with a pot. on the side, down low. This would greatly simplify things for me. But apparently not simple enough. One channel would power the MTM with a passive XO around 3500. Another channel would power an added 4 Ohm mid just below doing baffle step compensation. The last two channels would drive the subs.
Have you tried measuring the woofers at different distances? I’m wondering if it’s floor bounce which is distance dependent.
Just for grins I modeled the two parallel TC9’s using the Peerless specs. In 5 liters, sealed along with a 2nd order, 100 Hz Butterworth high-pass they can reach 100 dB without exceeding their Xmax. And it results with a -3dB frequency between 125 – 130 Hz. So maybe an additional mid isn’t required.
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Thanks Ed. I am certain that you are correct, but the German in me wanted to use all channels. Also these speakers will probably be used singly in bluetooth mode. So I wanted max spl when powered with a 12V bat. I will take some new measurements on the baffle and load them into VCAD which I am somewhat familiar with.
As for the floor bounce, it is possible. Bill 4thtry also suggested that. So I thought to myself, instead of spending time trying to figure it out I would just go around it with an active XO. I am slightly better at recognizing my limitations than I used to be.