Wondering if a Classic 2.5 clone can be made with a series crossover on the woofers

[Chris Roemer]

1. No. the 0.68n(ohm) is NOT a resistor, it's the DCR (resistive component) of the coil (inductor) winding.
The 16n IS a resistor that's inline w/the tiny notch cap (to prevent a "short" of high or very high frequencies from reaching the amp).
There are only 3 physical components there: series coil, a tiny cap, and a resistor inline w/the cap.

2. The 75uF cap passes highs around the woofer (meaning it won't play as high up as the woofer w/OUT the parallel cap).

3. Funny thing is that both woofers are wired in series. It won't matter which one you put the cap "across" (in the schematic). The only thing that matters is that the cap is in parallel w/whichever woofer gets mounted lower (farther from the tweeter) in the box.

3.(again) - I mentioned in a post UP^THERE how you could just run the woofer pair (w/one bypassed by a large cap) just to check the feasibility of this topology (since at least someone here, at sometime in the past, claimed that this won't work "properly" - for some reason).

[Kootskid]

Chris,

Thanks for the info. Just to test the concept, could I wire the woofers in series w/large cap on the bench, rather than building a cabinet at the present.

Myles

[Chris Roemer]

Sure, but woofers don't sound like much in "free air". If you had measuring equip., you could maybe tell something by close mic'ing them. Will you able able to judge "by ear"? I'm not sure.

[Kootskid]

Yeah, I see your point. Will slap some cheap cabs together, hopefully in the near future to give a test. Should I also wire up the tank circuit and the zobel, or is the large cap good enough for the test.

Myles

[Wolf]

You'll need the upstream voltage divider for it to even remotely work, so the xover is important.

It may have had something to do with the path of least resistance as to why this does not work. The bass frequencies will be lower impedance through the woofers than the cap and pass through both. I can't guarantee the upper mid frequencies will bypass the capped-off woofer.

Later,
Wolf

[Kootskid]

Wolf,

Thanks for the comments. Since this is a dark horse, I would like to build the LP circuit in an enclosure. While I am doing that, I will finish my speaker building course and hopefully acquire measuring tools to see what is happening. Then I can report back with something useful (hopefully).

Myles

[Kootskid]

Also, while cruising some audio websites I came across a series crossover used by CJD in his Asonica 2.5TMM build. A few more parts and complexity, but maybe some insight also. Here is the link:

[Wolf]

That's a basic SXO, 3rd order electrical on both driver with a notch for impedance and a notch for breakup, and the x.5 coil (parallel style) to the second woofer. This really is not the best solution with 4 ohm woofers.

Later,
Wolf

[Kootskid]

Thanks Wolf, also found out that Exodus anarchy woofers were 8 ohm rather than 4 ohm. I think I have used everyone's time enough on this subject, so I will try the Lout/Roemer x-over. If that does not work, then maybe a MTM in series. Next time I will buy the components needed for the build, rather than trying to re-invent the wheel.

Thanks to all that have contributed.

Myles