93.5dB efficiency- anyone done any builds around this?
https://audiotechnology.dk/c-quenze/23-i-52-17-06-sdka-03-8255/
Seems pretty uniquely placed.
https://audiotechnology.dk/c-quenze/23-i-52-17-06-sdka-03-8255/
Seems pretty uniquely placed.
Decent motor, light cone. Suiting suspension. You end up with f-3dB at 55Hz in a small box. Like about any 8” pro driver. And Per Skaaning doesn’t trust his measuring capabilities for sure 😛. His units sell just the same.
If I did build with this I’d look to cross over quite high, maybe 600-700Hz as I’d be using this as a wide-band midrange, with 2nd/1st order slopes.
Trying to find 3 way speakers, that are relatively compact, but offer 93-94dB sensibility - not many about without looking at horns, MTM/2.5 way, compression drivers etc…
I am presuming that Per Skaaning rates at 2.83v i.e. 1w into 8ohms. Therefore potential that only a 3 watt amplifier would be somewhat plausible, but 8watt (e.g 300b) should be plenty with headroom (subject to the amount of current / drive needed which I haven’t looked into yet).
There are loads of 8” BMS, FaitalPro, 18Sound and B&C drivers with 95dB and comparable specs. The only difference would be the PP cone. Which in itself could be an argument. But not the efficiency.
Why would you highpass an 8” at 700Hz?
Why would you highpass an 8” at 700Hz?
What does relatively compact mean in liters? What kind of F3 are you looking for? Which other drivers are you thinking to go with it?
There are several measurements of the AT23 around the web (dibirama,Troels Gravesen,archive.org AT site etc), but not this exact model, having a much lighter cone.
A lot of them (AT) exhibit the usual surround bump around 1k, and they're PP cones tend toi behave well, and a re very damped.
What range is it intended to cover, you wrote 3 way so?
6-700 hz high pass?
Midrange, high sensitivity, 1st order slope on high pass, your 'Homegrown* B&W probably makes the most well behaved midrange drivers with good sensitivity that exists to my knowledge 6-7". But the bottom end is very limited due to the xmax.
The B&C 8PE21 gets a lot of love for good reason.
Beyma, 18S, and Faital makes good midrange drivers too, worth looking at, with decent sensitivity.
Does anyone else have difficulty getting a reply from Audio Technology? I've contacted the business several times since 2015, and again last year with the same question about their T&S/magnet options with buying interest.
Yes, I did come across this, but think it was a lower efficiency model, 23 | 52 20 06 SD I think - I haven’t found anyone using this higher efficiency version(?).
Yes I’m looking around 600-700Hz high pass.
B&C 8PE21 is of interest, I’ll check it out. Any B&W drivers in specific you’d suggest, most obviously don’t come with T&S specs.
18 SOUND 8NMB420 was one of the best mid-ranges I’ve ever heard in Troels 3WC-15, but I need to look at directivity.
If you really want to high-pass that high (but why? anyway...) and still want to use a 8", then you don't need a woofer/mid-woofer, this dedicated midrange is hard to beat for the task IMO, but it's breakup needs to be tamed:
https://audioxpress.com/article/test-bench-b-c-speakers-8nsm64-closed-back-midrange
https://audioxpress.com/article/test-bench-b-c-speakers-8nsm64-closed-back-midrange
Last edited:
Thanks - yeah, I’m looking for smooth, SB Acoustics Satori style roll off, but with higher efficiency. Not sure it exists, but this AT driver is interesting.
Yeah, I'm starting to cotton on as to why most speakers only go up to around 90dB sensitivity - full range drivers need baffle step to stop them shouting and get rid of the rising frequency response (but they're usually very ragged in their response), and most of the regular drivers used in multi-way have similar issues requiring you to flatten them down... so seems as though you'd be better off simply accepting better measuring drivers and getting an efficiency boost via MMT or MTM.
Nice job by Tony Gee over here though: https://www.humblehomemadehifi.com/Nova-Andromeda.html
Nice job by Tony Gee over here though: https://www.humblehomemadehifi.com/Nova-Andromeda.html
Honest 91,5dB at 2,83V.
I think an 18sound 8NM610 would do the job for you. But a 6” would do better, given a range from 700Hz and up. Have you given directivity of your design a thought?
I think an 18sound 8NM610 would do the job for you. But a 6” would do better, given a range from 700Hz and up. Have you given directivity of your design a thought?
Directivity is important to me - on paper at least the Humble Made HiFi, or Elsinores seem to fit the bill best.
I had considered a 2 way in a TQWT as nice should be possible to get a nice even frequency response and dispersion, but I doubt I could get to my target of something close to 92dB sensitivity. 90dB with Scanspeak Ellipticor drivers in TQWT is achievable… but at significant cost.
I had considered a 2 way in a TQWT as nice should be possible to get a nice even frequency response and dispersion, but I doubt I could get to my target of something close to 92dB sensitivity. 90dB with Scanspeak Ellipticor drivers in TQWT is achievable… but at significant cost.