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I was playing my Korg MS-20 the other day when smoke started pouring out of my vents on the DIY speakers. Whan I removed the back, it appears the the capacitors on the tweek part of the crossovers totally fried. It seems that the tweets themselves are ok. I doug thrrough all the old posts and found all the data for the crossovers, I just can't find the schemetics. Can Anyone help? Below is the data for the crossovers.
Well, I WOULD run as an MTM, in 1.6cf, but I'd go vented with a 3" long port w/a 2.5" id. They should reach down below 40Hz vented, and will be able to handle more power before excursion issues. Your woofers will be wired in series (for an 8 ohm bass section).
This should get you pretty close. I'm not sure on BSC, as I think PE has hosed up the sensitivity ratings. They state 96.5 dB at 1w, but on Vifa's spec sheet it's rated 96.5 dB at 2.83v (which is TWO watts for a 4 ohm driver). A couple years back, PE (and/or Dayton) screwed up by changing all their sensitivity specs FROM 2.83v (which is what we need) to 1w. It SEEMS like they're trying to switch back now, but it'll take a while until I can once again trust their specs. THEY ARE WRONG for this Vifa tweeter.
2nd order HP w/L-pad:
12uF series cap, then a #20 0.40mH shunt coil (to ground), then the "L" w/a 2n (ohm) series resistor, and a 4n parallel. NORMAL polarity on this tweeter.
2nd order LP w/Zobel:
a 1.5mH coil (lower DCR is better, probably an iron core here) WITH a tiny 0.68uF cap in parallel with it to act as a notch filter, then a 5uF shunt cap (to gnd), and lastly a Zobel using a 10n resistor and a 10uF cap.
This crosses near 1.9kHz, and runs about 88dB. Off you go.​
Well, I WOULD run as an MTM, in 1.6cf, but I'd go vented with a 3" long port w/a 2.5" id. They should reach down below 40Hz vented, and will be able to handle more power before excursion issues. Your woofers will be wired in series (for an 8 ohm bass section).
This should get you pretty close. I'm not sure on BSC, as I think PE has hosed up the sensitivity ratings. They state 96.5 dB at 1w, but on Vifa's spec sheet it's rated 96.5 dB at 2.83v (which is TWO watts for a 4 ohm driver). A couple years back, PE (and/or Dayton) screwed up by changing all their sensitivity specs FROM 2.83v (which is what we need) to 1w. It SEEMS like they're trying to switch back now, but it'll take a while until I can once again trust their specs. THEY ARE WRONG for this Vifa tweeter.
2nd order HP w/L-pad:
12uF series cap, then a #20 0.40mH shunt coil (to ground), then the "L" w/a 2n (ohm) series resistor, and a 4n parallel. NORMAL polarity on this tweeter.
2nd order LP w/Zobel:
a 1.5mH coil (lower DCR is better, probably an iron core here) WITH a tiny 0.68uF cap in parallel with it to act as a notch filter, then a 5uF shunt cap (to gnd), and lastly a Zobel using a 10n resistor and a 10uF cap.
This crosses near 1.9kHz, and runs about 88dB. Off you go.​
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