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  1. But, what about the people that want that real...

    But, what about the people that want that real “Autotransformer” sound? :blink:

    Whatever that is?:dont-know:
    I am kidding of course…:lol_fit:

    No, I only did this research just to prove or...
  2. Since, the results of my first tests just did not...

    Since, the results of my first tests just did not seem to me as being very conclusive as to which secondary location came closest to fitting the mathematical model. I decided to create another tap...
  3. Admittedly, looking at the test results, it does...

    Admittedly, looking at the test results, it does have me scratching my head a lot. There are a few things that I kind of expected like the measured output voltage drives being lower than their...
  4. Now we come to some test results. I should point...

    Now we come to some test results. I should point out that in the 3110A network, when the HF Boost is set to its minimum setting that a 3.9 ohms resistor (R4) is bypassed. And so it would appear that...
  5. The first big surprise was measuring the tapped...

    The first big surprise was measuring the tapped coil’s inductance. It would appear that when it comes to inductance the total is much greater than the sum of its parts. So, any myth of stringing...
  6. Well, as you all know 4313B has already come up...

    Well, as you all know 4313B has already come up with a non-tapped autotransformer version of the 3110A network. But, I thought I would do some tests and see if I could come up with some suggestions...
  7. Hi GrooveControl Yes, the correct value is...

    Hi GrooveControl

    Yes, the correct value is 0.02mH. By using a 0.20mH coil instead, you can clearly see how the 0.2mH coil and the 0.3uf cap is resonating at about 6,499Hz. Call it one of those...
  8. Hi 4343 There is a simple explanation why the...

    Hi 4343
    There is a simple explanation why the different attenuation taps don’t affect the response curve at 20KHz on the MAX HF setting.
    The 3.0uf cap and the 0.02mH coil form a RLC series...
  9. Thanks, 4313B for taking the extra time in...

    Thanks, 4313B for taking the extra time in showing us why.
    Wow, do those curves look really messed up.
    I guess that really proves that you can’t treat a tapped autotransformer like an inductor....
  10. Thanks again 4313B :applaud: It looks like...

    Thanks again 4313B :applaud:

    It looks like N4671 network is nearly identical to the standard 3110A. But without the impedance dip at 400 Hz.
    From a practical point of view, low pass section of...
  11. Wow, 4313B !!! :applaud: You sure make it look...

    Wow, 4313B !!! :applaud:
    You sure make it look easy. I bet that Leap Crossover shop software didn’t come cheap.

    In researching this, I did turn up a 3310A variant. The high pass section is...
  12. For those of you following this thread, you can...

    For those of you following this thread, you can tell I have more questions than I have answers right now.

    Hi 4343, Are you getting 0.8283mH of inductance when you measure it between pins #2 and...
  13. Hi 4343 Yes, I did simply subtract the 25.1% to...

    Hi 4343
    Yes, I did simply subtract the 25.1% to get the 2.4717mH value for the -6 tap. I thought the idea would be worth trying. And in a way I am actually surprised how quickly you have been...
  14. I should say this now, just in case this all...

    I should say this now, just in case this all blows up in my face.

    The tap inductance values that I posted are based on calculations and are not based on actual measurements from a 3110A crossover...
  15. Hi 4343 Oops, Yes I did slip/flip a decimal! The...

    Hi 4343
    Oops, Yes I did slip/flip a decimal! The correct turn ratio for a -6 db tap is 0.5012. Actually, you are probably right about using a 16 gauge coil for the HF driver is over kill. An 18...
  16. Hi Robert Just to give you an idea of just...

    Hi Robert

    Just to give you an idea of just much additional wire that you might need on have on hand for this project. Taking into account the DC resistance of the Erse Super Q coil is 0.187 ohms....
  17. Crossover Network Rotary Switch

    Well, without having an actual JBL network on hand to do an exact comparison. This is my best guess as to the correct switch for the network. I am pretty sure that JBL is using an Electroswitch brand...
  18. Hi Robert Here is how I would attempt to make...

    Hi Robert

    Here is how I would attempt to make a tapped 3.3mH coil for the 3110a crossover. I would start with a 3.3mH Erse 16 gauge Super-Q coil and some additional 16 gauge magnet wire and an...
  19. Hi Robert You cannot use multiple standard...

    Hi Robert

    You cannot use multiple standard inductors simulate a tapped inductor. A tapped inductor acts like a transformer. And since, there are not separate primary and secondary winding, these...
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