Some speaker driver measurements...

Yamaha JA-0801 vs M74B

The yammy traces are from the spec sheet and Troels.

Looks on-par?

JA_0801_VS_M74B.jpg
 
What? No M74D? 🙂

The M74A and S look very appealing to me. I wonder what the chance is that they will be available before the end of this year. I wonder if there's any chance I'll be able to afford them (I'm assuming the M74B will be out of the question).


As far as I see it M74B and M74S looks crazy good. Hope that distortion will be on par with parameters.
 
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What? No M74D? 🙂

The M74A and S look very appealing to me. I wonder what the chance is that they will be available before the end of this year. I wonder if there's any chance I'll be able to afford them (I'm assuming the M74B will be out of the question).

Fortunately, there is no D version. This fact keeps me from selling a kidney🙂
I was told that the new midranges will go on sale only next year. Don't know the exact date.
 
Yevgeniy how do you like the Puriwave?

I've finished my Purifi 2 way and very satisfied with it. I'm moving onto Purifi 3 way with the new 8" woofer. Cabinets are being made... I'll probably go twin 8" woofers and active. Passive is also a possibility, but will need larger cabinets of course. I'm not sure whether it will be Bliesma or Purifi...

Jon Marsh over at HTGuide is building a passive 3 way with Bliesma tweeters, Purifi 6.5" midrange and twin 12" Dayton RSS subwoofers; it's a back breaking, no holds barred assault on the state of art...

2021 Isirs Update
 
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all in all, the SB Md60n is not that bad! ;-)

Md60n just needs a regular chamber instead of the resonant tube and it would be a great driver in my eyes. It's just not revolutionary, it doesn't appear to provide much more than you get from a 20 year old Morel.

At least Beliesma has used a normal chamber so they're already off to a good start 😉
 
Who is making the cabinets for Your Purifi 3 way project ? Sounds like it will be a killer setup

Like the Isirs, I’ve been using separate bass bins for a decade now. I think there a so many benefits; both from a designers and consumers point of view.

In the design below there is another W (not pictured) as part of the speaker design.
So a stereo setup consists of 2 x WMTM + W + W.

All woofers are the same; and crossover at 120Hz; as per LFE standard.

Place the extra 2 woofers about the room; for smoother in room bass response.

Crossover and dipole design by the great John Kreskovsky
 

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"Crossover and dipole design by the great John Kreskovsky"
They look awesome -were the cabinets done by you or the guy who does Osborne loudspeakers Aranmar Acoustics ? The sad fact is I have never heard a John Kreskovsky speaker design - he certainly used top drivers.