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mboxler

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Everything posted by mboxler

  1. Okay...now I'm confused again. In my last picture the words OUT are on the left side, but there are three wires on the right side that I assumed were to connect to the three woofers. Which is it????
  2. @senzlez2, does the new layout make sense? As @wingletpointed out, the inductor was the biggest problem. The capacitor issue would have just made it sound different. If my alphabet system works, I'll tag the tweeter circuit as I (we) see it should be just to be sure it's okay. We all started out where you are. Don't be discouraged, it's a learning experience. Mike
  3. Dean's right. The larger the inductance between the output taps to more the filter behaves like a first order vs a second order. Unfortunately, I can't remember if that test was with a new T2A or the way-out-of-spec one I removed from my Heresy. I'll rerun that voltage test with the Heresy one just to be sure.
  4. I agree, but I think there are other issues. Looks like the amplifier is directly connected to the 30uf capacitor. I'll try another approach. Hopefully clearer??? Connect Woofer IN- to Woofer OUT- (new black wire). Connect Woofer IN+ to A (new red wire). Connect B to Woofer OUT +. Connect B to C. Connect C to E. Connect D to GROUND. Connect F to G. Connect H to I. Connect J to GROUND.
  5. I'm very sorry. Once I rotated the picture things got clearer. I've drawn how one way to wire the circuit. It follows the schematic in component order, although it could be wired other ways. I'll try to write out what needs to be done. Red is the positive path, Blue is the negative path. The red circles mean no connection. Woofer in + to 1.3mh in. 1.3mh out to Woofer out + AND 30uh in AND 8.2 ohm resistor in. 30uh out to ground. 8.2 ohm resistor out to 75uf in. 75uf out to 3.6mh in. 3.6mh out to ground. Does that look right @winglet? Still on my now cold first cup of coffee. EDIT: I rotated the picture 90 degrees. Left is input right is output.
  6. Rats! In my first post of this thread I said "I assume the bottom of the picture is input?". Is that not true? I'll rotate it and look again. On my first cup of coffee, but I'll gradually wake up.
  7. I see problems on the tweeter side. I have a feeling you don't measure an open circuit across the tweeter terminals with no straps? I'll try to draw how it should be. It may take a while. In the mean time, if you read around 4 ohms on the woofer terminals without the straps you should be able to hook your amp to just the woofer terminals and see how that circuit performs.
  8. My pair are set up for bi-wire, so I have the straps removed. I measure around 4 ohms on the woofer terminals and an open circuit on the tweeter terminals. Sorry, but can you measure again with the straps removed?
  9. 8 ohms is a nominal figure measured with 20 to 20000hz sweeps. Your multimeter is sending and measuring DC, which won't work. That's why you need to measure drivers disconnected from the crossover to measure the DCR of the voice coil. Once you apply AC everything changes. I happen to have a pair of RF-83's. I'll check resistance at the terminals and get back to you. I'd still give it a try now that the resistor can do it's job.
  10. With the 8.2 ohm resistor "bypassed", the impedance of the woofer circuit drops to a dead short around 300hz. That's the resonance frequency of the 3.6mh in series with the 75uf capacitor.
  11. Sorry, I meant a wire from the bottom - to the top - with no other added connections. That resistor is already connected to the bottom -. You've shorted out the resistor with that joint. Try desoldering that spot and bend the wire over that "intersection" to see if that fixes the issue. Later I'd clean that up.
  12. You don't want a connection there. Can I assume that wire then goes to the - terminal at the top of the picture?
  13. What ohm reading do you get on the drivers in the speaker with the new crossover?
  14. I agree, kinda. When I run the simulation with the 3636, the slope is 12db/octave up to about 100hz, at which point the slope starts to flatten out. The steeper slope is there, it's just useless. With a T2A, that slope will extend much further into the audible range.
  15. On the speaker with the new crossover, disconnect the speakers from the crossover and measure the DCR from the + wire through the tweeter to the - wire. Do the same with the woofer(s). Hopefully there isn't a short of some kind.
  16. As already stated, the two biggest differences between the T2A and the others is the inductance and the -3.35db tap. Of the two, I believe the inductance has the biggest effect. Of course, the combination of a "brighter" polypropylene capacitor combined with .35db less attenuation might be noticeable as well. Even though all of the autoformers will result in a 2nd order high pass to the squawker, the inductance between taps 0 - 4 dictates how high in frequency the 12db slope extends. The lower the inductance, the higher in frequency the 12db slope extends. I can't find any published specs on the 3636, but one of them I have measures around 90mh between taps 0 - 5. The published inductance of the T2A is 45.6mh +/- 15%. A T2A I removed from an old Heresy measures 32mh. Since the inductance between taps 0 - 4 forms the second order, the values are... 3636 45mh T2A (spec) 21.2mh T2A from my Heresy 15mh Although my T2A may be an extreme case, you can imagine the difference the shunt inductance would make. Mike
  17. Hmmm. Can you post another picture of the new crossover? Also, it might be a good idea to measure the DCR of the voice coils on all your drivers. Perhaps whatever damaged your crossovers also damaged a driver.
  18. When I simulate the circuit the way I think it is now, the impedance drops below 2 ohms around 1khz. Then it sharply increases to 50 ohms at 2khz. That's a tough load on an amplifier.
  19. Looks to me you are missing a common ground wire on each circuit. I assume the bottom of the picture is input? If you run another black wire from the bottom right screw to the top right inductor (where the other black wire is connected) the woofer circuit should work. Likewise on the tweeter circuit. Unless you connected them underneath the board??? Mike
  20. What DC reading did you get? Sounds like you need a larger capacitor.
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