I am looking for a new speaker project to replace my Zaph ZDT 3.5

I am soliciting suggestions for new design of stereo 3 way or even 4 way speakers. I am fairly adept in the wood shop and will build my own cabinets and crossovers. I have no delusions about designing my own - I do not have that skill so I want a proven design.
I have pair of ZDT 3.5s that I am actually very content with. But they are over 10 years old and I want to try something different. Amp is a McCormack DNA 125. I listen to Symphonic music, Jazz, and some Rock. Speakers will also be used for watching movies. My room is large and pretty live. Measures about 25 x 35 ft and has 14 foot ceiling.

If there was something I would like more of from my current speakers its a wider sweet spot. Prior experience with speakers was with Saphire IIti/Sub1s, and before that a pair of Altec Lansing 604Ds in Karlson cabinets. I have kept both pair by the way.

I have been reviewing the Anthologies, and the Kairos 3 ways. Also thought about using the Kairos woofer module with the Spirit Winds. I think the Anthologies are about the largest I would want in my living room. I have also seen the Morel Diadem, and PBN 741 and SBA Sasandu on the Madisound site but cannot find any experiences with these.

Thanks in advance for reccomendations

Dave

Links:
Kairos 3 way: https://meniscus.lightningbasehoste...he-Kairos-and-Continuum-Three-Way-Writeup.pdf
Anthology: https://meniscusaudio.com/product/anthology-speaker-kit/
Sasandu: https://www.madisoundspeakerstore.com/3-way-speaker-kits/sb-acoustics-sasandu-kit
Morel Diadem: https://www.madisoundspeakerstore.com/3-way-speaker-kits/morel-diadem-3-way-speaker-kit-parts-only/
PBN designs: https://www.madisoundspeakerstore.com/3-way-speaker-kits/b741-scan-speak-kit-pair-by-peter-noerbaek/
 
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I haven't heard any of these, but I would think they will all sound pretty good: did you get some ideas from their write-ups, eg the Anthologys are noted to have a wide sweet spot.

What about budget, cabinet size and crossover complexity, how do they compare? They're the sort of Qs I would be thinking about.

Geoff
 
If you want a speaker to sound good as you walk around the room, you are interested in the off-axis response curve.
How good is your hearing? If you can hear 14 khz (I can) then at least SBAacoustics provides a 30 deg off axis chart on the sasandu model. 8 db down at 15 khz is not very good. I didn't see any off axis response curves on the anthology website. Even the pdf download was a bunch of blather, no tests. For $1000 you would think mesniscus would test one. I didn't look up your other models.
Pispeakers.com 4pi off axis response is a little better at 30 degrees, 5 db down @ 15 khz. www.pispeakers.com/Measurements/fourPi.html
I've owned a built up 2 way with -3 db response at 30 deg horizontal from 500 hz to 16 khz, the Peavey SP2-XT. See the horizontal polar patterns, the DI chart is 6 db response. I paid $300 apiece for some used ones. They sounded the same anywhere in the room over 10 feet away. I mounted mine on poles near the ceiling to project highs over all the furniture, as they are designed to be installed. Modern Peavey SP2 are tuned for high power, 1000 w AES, which means the woofer may beam and wide response is not charted or bragged about. Used SP2(2004) don't have the chart, but are pretty good off axis, and I got my replacements fot the stolen SP2-XT for $400 the pair. SP2(2004) 6 db radiation is specified 90 deg hori, +10 -30 deg vertical. Again designed to be mounted on poles projecting highs down at people's heads. I listen to these 500 W capable speakers at 1 watt or less, since they are 98 db 1w1m. See the SP2(2004) distortion charts, 2nd & 3rd harmonic distortion 20 db down from 5 W response 54 hz to 8 khz. I've only seen HD charts on individual drivers, not on any other packaged speaker or kit. Low HD to me means a Steinway piano, a cymbal or a tinkly bell sound pretty accurate, IMHO. Which is why I bought them; I tested used ones with a piano CD before purchase.
The Peavey SP2 is a copy of some JBL products, but JBL despite their stellar reputation in the profesIsional line, don't provide off axis charts that I can tell. They don't bother to have a dealer in my city either, so no personal experience. The current EON-615 is +- 3 db 50-20 khz centered and pattern is "90 by 50 " whatever that means. In the PA market coverage is usually discussed at the 6 db down point, which may be okay but not as good as 3 db coverage IMHO. No HD chart.
Another poster looking at building wide dispersion speakers is this thread: https://www.diyaudio.com/community/threads/efficient-2-way.380822/
I'm looking at mating the Eminence 15" Deltapro-15A to the N314-X 1.4" CD driver for dispersion as wide as the SP2-XT. N314-X measured HD as low as 4% 2nd harmonic to 12 khz. www.audioxpress.com/article/test-bench-eminence-n314x-textreme-compression-driver/
Happy shopping and maybe later building.
 
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There is something or two you can do with your qlready good sealed loudspeaker imho:
1) lythics caps have great capacitance variation, it should sound way better when the exact values are chosen then made after tests with mkp to avoid drift... measurement tools help : voice coil and caps measured, mic....
2) eq it for your room in the digital domain and enhance readeness with appropriate curve and one or two distributeed sub for the 2 first octaves : mic, DRC, laptop with REW, etc.
It will beca far better improvement that changing flavors with a different loudspeaker as your is really good enough with the good taste to be sealed in the bass.
Just 2 cents.

Edit: could drive towards a great journey: multi channel dac, multi amps, etc
 
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If OP doesn't want to try dipoles like NaO Note or LX521, may I suggest investing on good bass?

Zaph 3.5 is verry good speaker, but it has only 2x 6.5" woofers with bass-reflex tuning. Belieeve me, sealed box large drivers (2x10-12") with some eq will make most impressive improvement. Easy choice is to make an active woofer box with some Hyper FA modules. At least two-way is needed because one needs to set delay for the mid-tweeter system. Making passive 3-4 way is more difficult to get reasonable balance between units.