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mboxler

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Everything posted by mboxler

  1. Did you ever try to connect the transformer outputs to the audio interface board, bypassing the input op amps? I sold my EVM before trying this out. Mike
  2. Without knowing the crossover schematic, let's assume a 1 mh inductor in series with a 4 ohm load. At 637 hz (the -3db point), the impedance would be 5.66 ohms. 8.95 at 1274 hz. All I'm saying is that I wouldn't classify this as a 4 ohm load on the transformer.
  3. On top of that, splitting the crossover does not create separate 4 ohm and an 8 ohm circuits, if I understand what is being implied.
  4. I assume the 20 volt preamp output would be for a current amplifier instead of a voltage amplifier.
  5. The miniDSP 2 X 4 input max is .9 volts or 2 volts, depending on a jumper setting. The output voltage, however, is set at .9 volts. If the input setting is 2 volts, the output has a 7 db insertion loss. Mike
  6. Interesting! Someday I'll re-install my ALK Universals into my K-horns and experiment. I have a pair of 1.0 mh inductors that I can put in series with the 1.3 mh in the crossover. I assume the yellow graph is the woofer, with the woofer current lagging the mid driver current by 90 degrees? Thanks for the info! Mike
  7. Not to create more work, but I'm curious what the voltage drop across the 1.3 mh inductor is at 430 hz. Maybe 1.3Vpp??? Mike
  8. Selling my pair of BMS 4592ND-Mid (16 ohm) drivers. Purchased new from Greg Roberts in 2011. Never abused. Incredible drivers. SOLD includes PayPal fees and shipping to ConUS. Mike
  9. When you say "measured", are you passing a 430 hz signal to the speaker, checking the voltage across the crossover input, then checking the voltage across the woofer output? The woofer out should be the input times .707. Mike
  10. I actually have three of these. One for my RF-83's and two for my LXmini's. I think they are great sounding amps, and the variable gain feature comes in handy. Just make sure the power supply is adequate for your needs. Mike
  11. Deleted 'cause I don't know what I'm talking about 😶
  12. It's five o'clock somewhere! This will be fun. Bringing as much stuff as I can, not knowing what the issue(s) are. Even found the old diaphragms from my Heresy's K-52-H mids, just in case his contains the Heppner K-52-H as well and one or both are bad. Also a pair of K-77-M's. Hopefully it's something simple, but we'll see. Mike
  13. Looks to be in the Denver area. If you are reasonably close to the Golden area, I'd also be happy to help. Mike
  14. Thanks, Chris! Still learning, and I could never figure out what .zma files were. Opened it up in notepad and it became clearer. At first I thought the phase column represented the electrical phase shift across the driver. But it now appears that it is acoustical phase shift. Correct??? Again, thanks for the info. Mike
  15. Chris Am I reading the Crites .zma file correctly? Looks like the driver, at 800 hz, is 8.5 ohms and 38 degree phase (inductive). Seems as though a 1.7 mh inductor would be needed, or am I missing something. Mike
  16. You could try these https://www.parts-express.com/speaker-l-pad-attenuator-50w-mono-3-8-shaft-16-ohm--260-254 between the squawker output of the crossover and the BMS driver. You are going to need around 12-14 db attenuation, and they don't specify the maximum attenuation of the l-pad. Are you using the K-77 tweeter? Gorgeous speakers! Mike
  17. And which BMS mid driver...8 ohm or 16 ohm?
  18. That is old! If you want to stay at 500hz, 5mh should work. 6.4mh for 400hz. If you get a 5mh, you could wire it in series with the 1.3mh, giving you 6.3mh, and see if you like it.
  19. I was hoping you had the stock 1.3mh inductor, as that would be way too low, and would account for your measurements. But the 5mh should have been better. Any way to measure the 5mh to verify it's value?
  20. What value inductor are you using for the woofer? Looks like you would need a 6.4mh to cross a 16 ohm woofer at 400hz.
  21. The more I look at the picture, this may be easiest (and what you were suggesting). Is there enough of pin 5 exposed to allow a quick disconnect to push onto? If so, remove the wires you marked red from the input. Maybe wrap the spade with electrical tape to make sure it doesn't make contact with anything. Crimp a spade connect to one end of the wire and a quick disconnect to the other end. Connect to spade end of the wire to the input red. Push the quick disconnect onto pin 5. I think that should work. Mike
  22. Sorry for the late reply @Gints. Yes, that sounds correct, but if you want to modify the current crossover, I think this would be easier... Leave the 2.5mh inductor. Since the woofer will not be connected, no current will pass through it anyway. You can leave the 6.8uf cap in place IF you can run a wire from INPUT to pin 5 of the autoformer. This wire would be in parallel with the 6.8uF capacitor, causing very little current to pass thru the capacitor, like it's not even there. With this setup, the 3db attenuation would not be needed in the miniDSP. If you don't like the results, remove the wire, and you're right back to where you started. There shouldn't be any load issues. If you want a greater and more consistent load on the high pass amp, you could solder a 10 ohm resistor from pin 0 to pin 5. But I'd take it one step at a time. I always place an 8 ohm resistor across the tweeter output, a 13 ohm resistor across the mid output, and use a cheap amplifier to pass varying frequencies to the crossover input. Using a true RMS multimeter, I measure the voltages across everything just to be sure I didn't screw something up, then connect to the drivers. If you lived in the Denver area I'd be happy to help you with this. Hope all this makes sense! Mike
  23. Not sure how your DIY skills are, but the resulting circuit is quite simple... Autoformer 500uH inductor 4uF capacitor Here's an unfinished AB-4500 (type A, bi-amp, 4500hz) crossover just to give you an idea. I believe for your CS you would attenuate the hi-pass output of the miniDSP by 3db. The nice thing about this setup is you can attenuate the PD-5VH to match your CT-125, then attenuate the high pass output from the miniDSP to match the low pass to the woofer. Mike
  24. mboxler

    Death & Eternity

    Reminded me of this video... https://www.youtube.com/watch?v=MBRqu0YOH14 I realize this is 6 minutes of your life that you will never get back.
  25. Radio Paradise just released their lossless web player. And for any of you using MIchael Herger's Squeezebox server and Radio Paradise plugin, he just updated the plugin to allow access to the four FLAC mixes. Mike
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