I assume it is 80-85 dB, but could be less. I did not measure.
I know it flies in the face of speaker-building orthodoxy. I listen to only classical music, mostly vocal and piano, at low to moderate level. Tube amplifier with 3 W output.
Funny, the neo-8s plays piano music - very realistically - without any help at the low end. Two of them, in a small baffle, leave little to be desired.
Accuton bd51
Quite expensive, but you can cross it even under 1khz.
Monacor dt-352
Manufacturer says you can cross it 1.5khz
Quite expensive, but you can cross it even under 1khz.
Monacor dt-352
Manufacturer says you can cross it 1.5khz
While the 50mm Accuton mid-tweeters look like they should be capable of a 1kHz crossover frequency, it is not possible to buy any of the Accuton diamond diaphragm drivers unless you are affiliated with a loudspeaker manufacturer.
A more practical solution could be to use Accuton's C51-6-286 (50mm ceramic diaphragm mid-tweeter) crossed over at 800~1kHz, with an additional small-diameter tweeter (such as Accuton's C30-6-358, or ScanSpeak's D3004/604000) dedicated to the region above 5kHz.
A more practical solution could be to use Accuton's C51-6-286 (50mm ceramic diaphragm mid-tweeter) crossed over at 800~1kHz, with an additional small-diameter tweeter (such as Accuton's C30-6-358, or ScanSpeak's D3004/604000) dedicated to the region above 5kHz.
If going the dome mid and tweeter route, the Morel TM4055-8 seems like an easier approach. But I think it's larger than the OP wants.
https://www.parts-express.com/Morel-TM4055-8-2-Midrange-and-1-1-8-Tweeter-Speaker-Plate-287-038
https://www.parts-express.com/Morel-TM4055-8-2-Midrange-and-1-1-8-Tweeter-Speaker-Plate-287-038
It is larger than place for installation I had, but tweeter parameters of it are promising: frequency response: 640-20,000 Hz • Fs: 640 Hz.
Only I not find any Morels tweeter what had similar Fs and response range.
Only I not find any Morels tweeter what had similar Fs and response range.
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They may have modified the tweeter specifically to match the sensitivity of the mid, or it may be an older tweeter design they've held over for that particular application.
Dome : Bliesma T34 A/B have the highest xmax and very good distortion down low, a Waveguide to naturally boost the low end would be a decided advantage, good powerhandling, no better candidates that I'm aware of. FS is not very low, impedance correction will be wanted this low with passive xo.
Steeeep filters and some attenuation will get you there if your not too greedy on volume.
AMT/planars: Beyma tpl 150 with a custom waveguide, deep backchamber, and different mods might take you there.
Stage accompany SA8535 with horn/wg.
Mundorf PRO AMT with horn/wg.
Compression Drivers: a bunch from 1" and up, as long as the horn is suitable.
Steeeep filters and some attenuation will get you there if your not too greedy on volume.
AMT/planars: Beyma tpl 150 with a custom waveguide, deep backchamber, and different mods might take you there.
Stage accompany SA8535 with horn/wg.
Mundorf PRO AMT with horn/wg.
Compression Drivers: a bunch from 1" and up, as long as the horn is suitable.
Bliesma T34 should be fine for your use. Here are some measurements I did some time ago in a protoype for a friend (T34A) - pretty rough measurements with some room influence and a not perfect baffle but give a hint what's going on with THD <1kHz - the driver behaves very well!
Btw - wavegudies for the Bliesma T34B:
https://www.somasonus.net/bliesma-t34b
But to be effective at 1kHz it would need to be pretty big.
https://www.somasonus.net/bliesma-t34b
But to be effective at 1kHz it would need to be pretty big.
I am looking really small size tweeter, faceplate diameter can be no more than 80 mm.
Probably no any waveguide fit to this.
Probably no any waveguide fit to this.
Don't see how you're going to get this small @ 95 dB without a horn except with at least a (4) driver vertical array as Bozak proved way back when.
What about SB26STCN-C000-4 filtering on 1 kHz?
It has Linear coil travel (p-p) 1.2 mm, but Fs 960 Hz.
Or is possible to change SB29RDAC-C000-4 or similar SB 29 mm tweeters face plate to smaller 3D printed plate?
It has Linear coil travel (p-p) 1.2 mm, but Fs 960 Hz.
Or is possible to change SB29RDAC-C000-4 or similar SB 29 mm tweeters face plate to smaller 3D printed plate?
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You could take a look at the SB Acoustics SB29RDCN-C000-4 small flange neo tweeter. Years ago John Krutke (Zaph) had a design contest using this tweeter. One of the winners used a 1.1 KHz crossover. You can find the crossover, multiple distortion measurements and John's comments HERE. Worth a look considering your requirements.
SB29RDCN-C000-4 is good candidate only it seems like currently it is available as other type SB29RDNC-C000-4 and its distortion is higher near 1 kHz: https://hificompass.com/en/speakers/measurements/sbacoustics/sb-acoustics-sb29rdnc-c000-4
The N and the C just stand for neo motor and chamber being used. I would expect these to actually be the same tweeter except with new/different nomenclature. The hifi compass measurements still show a tweeter capable of going down to 1kHz if you don't want it loud. Yeah you get some extra 2nd order distortion but this is what ring domes do it's intrinsic to their design. The horrible sounding HD are the high orders and these are decently low.
My dyslexic mistake, it is the SB29RDNC-C000-4 . I agree with 5th element and remember that with a LR crossover the tweeter level is 6 dB down at the crossover point. You have a very restrictive set of requirements (size, depth, response, level) and I believe you're going to need to compromise somewhere.
It is not your mistake, on Zaph page it is also SB29RDCN-C000-4. From internet can be find also SB29RDCN-C000-4 datasheet, what is exactly same as SB29RDNC-C000-4 datasheet only impedance curve, Fs and Q-s are different, SPL lines are exactly same.
These SB Acoustic Tweeters are not made to be used from 1kHz - you will not get clear and lound sound.
THD goes up a lot at 1kHz - have a look at K3 (K2 is high anyways with these), when it goes up significant the use range of the speaker is done.
With your size restrictions I would search for a good 2" broadband speaker. They don't have great sensitivity and will not play to loud but 1kHz is no problem and you will find some which go fine to 20kHz.
THD goes up a lot at 1kHz - have a look at K3 (K2 is high anyways with these), when it goes up significant the use range of the speaker is done.
With your size restrictions I would search for a good 2" broadband speaker. They don't have great sensitivity and will not play to loud but 1kHz is no problem and you will find some which go fine to 20kHz.