Here’s a picture of the MTM’s with the same coated paper woofers you are using:
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The cast basket ones were truncated too, but had a more chiseled appearance and thicker mounting ring. The one with SB26STNC does look like a cast basket one.
I loaned those MTM’s and a Fosi 50 wpc amp to a friend for a special family party. He couldn’t believe how much sound those little speakers and tiny amp made, and they did it all evening long without missing a beat. DIY for the win!
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Have you ever posted about those? I don’t remember seeing them at all. They are with a peerless/vifa tweet obviously, but the single or dual magnet version?
Sorry Drew, I screwed up. You are right. The poly 4” woofers do have cast baskets.
I don’t know if I ever posted any details about that design (probably not). I do know I demo’d them in either Iowa or Indy or maybe both. Wolf would for sure recall whether they were demo’d in Indy or not.
That is definately the dual magnet “Beastmode” tweeter.
I seem to recall buying those 4” woofers from PE on sale for something like $9 each in qty 4. They are a great woofer for sure.
How did I miss out on that sale? I would have jumped on a quad or more at that price.
I think you took those to Iowa, as I don’t recall hearing those.
I’m finding getting close to the perfection of a mirror french polish are not easy. Going to land somewhere short of that. But this is my first try.
Shoved in some 1" acoustic foam agianst the ceiling. And a single large piece for the sides and back. It is such a small cab that it all wedges in and friction fits fine without adhesive. I left the bottom bare as that may get covered with crossover parts. Unless the circuit winds up small enough that I can attach it all to the terminal cup.
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nm. I think I found something that might work.
I prototyped the crossover on a single speaker to narrow down the circuit. Don’t know if I’m quite satisfied yet. But I’m to a point of ordering some parts to assemble both for more critical testing.
I’m thinking these may end up as my desktop speakers after they get swapped out in the living room. So I suspect the bass will be augmented by all the surface and wall proximity.
(~0-50deg, roughly 10deg ea)
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The circuit seems weird to me. Probably didn’t do a great job. They are 2nd order electrical, but they act more like 3rd order electrical.. The impedance looks like a 3rd order peak, the tweeter summed best at normal polarity, and reverse null was meh. I think the sim showed that impedance peak was the electrical crossover point. They cross around 2.4khz acoustically.
Though they sound pretty decent to me. I’ve been having an ear out for midrange distortion from the tweeter. Any time I think I might hear some I replay it, focusing more, but it isn’t there. Crank the volume more and still nada. However I do get a sense of “too loud” at times. That might be underlying distortion showing through. Need more time with em to decide if I want to glue the circuit down or make a change. They are setting on the TV stand on either side of the TV, only a few inches away from the Faux Pas. I suspect they might do a better “disappearing act” if I dig my stands out of the basement to get em seperated more and away from stuff.
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Those are adorable. I noticed that your polars are bunching up together between 3-6 K. Could be creating a bump in your power response. Not sure. Only kinda sure.
Yep, probably does. Guessing the woofer narrows in dispersion a bit earlier than a typical 4"er.