There are several threads here about matching tweeters for the Visaton WG148R waveguide which is a powerful addition to the speaker designers' toolbox.
I am looking for a 1" dome, w/ flat faceplate, with the highest top-octave efficiency as possible. I want to match it to a woofer that's 94-95dB 2.83v/1m. The max efficiency of the system ends up being constrained by the tweeter.
Most 1" domes don't go past 91-92dB. In the top octave, mass prevails over horn coupling, so the waveguide won't increase the SPL much if at all in that range. Therefore we need a tweeter with high BL, low impedance, and low mass.
Also for this waveguide you need a flat faceplate, otherwise you have to mess around with gaskets and mods.
Are 28-29mm domes too big to match the WG148R?
Other threads have discussed SEAS and Peerless 25" domes, ie https://www.diyaudio.com/community/threads/xt25-visaton-wg-148-r-with-pictures.285240/ and https://heissmann-acoustics.de/en/test-wg148r-noferro-900/ but none of them reach into 94dB sensitivity territory.
Any suggestions?
I am looking for a 1" dome, w/ flat faceplate, with the highest top-octave efficiency as possible. I want to match it to a woofer that's 94-95dB 2.83v/1m. The max efficiency of the system ends up being constrained by the tweeter.
Most 1" domes don't go past 91-92dB. In the top octave, mass prevails over horn coupling, so the waveguide won't increase the SPL much if at all in that range. Therefore we need a tweeter with high BL, low impedance, and low mass.
Also for this waveguide you need a flat faceplate, otherwise you have to mess around with gaskets and mods.
Are 28-29mm domes too big to match the WG148R?
Other threads have discussed SEAS and Peerless 25" domes, ie https://www.diyaudio.com/community/threads/xt25-visaton-wg-148-r-with-pictures.285240/ and https://heissmann-acoustics.de/en/test-wg148r-noferro-900/ but none of them reach into 94dB sensitivity territory.
Any suggestions?
Have you looked at the Satori TW29BNWG-4. It's speced at 97dB (altoug i would more consider 95dB) sensitive and has a waveguide as part of it.
https://hificompass.com/en/reviews/satori-tw29bnwg-4
https://hificompass.com/en/reviews/satori-tw29bnwg-4
@waxx yes, have used it and LOVE it. See my dipole / Open Baffle project with a 15" LaVoce woofer - https://psma-website-assets.s3.amazonaws.com/live_edge_beryllium_dipoles.pdf
Best tweeter I've ever used. It's just super expensive.
Best tweeter I've ever used. It's just super expensive.
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I changed my design paradigm. Multichannel amplification and digital crossovers. Speaker displacement and sufficient power handling to get to Xmax is what I look at now. This eliminates obsessing over efficiency numbers. I found that high efficiency speakers often achieve their high numbers by reducing Xmax to a near zero number and reducing cone mass and stiffness so you get early breakup. What's the point of having highly efficient speakers that are running out of the linear range almost immediately. I want a driver that operates as a piston and has sufficient Xmax to move some air. Hypex makes some nice multi-channel plate amps with built in digital crossovers that are plug and play. The Visaton ceramic coated aluminum dome Tweeter that fits the Visaton waveguide is really excellent, and has decent Xmax. Make sure it is shipped wrapped in lots of padding, as the US vendor tends to just drop them in an empty box to rattle around and it is destroyed when you get it. When dropped by UPS on its side the face plate shifts relative to the magnet as it has no indexing pegs.
I’d ditch the idea for a few reason:
1. getting very good coupling - tough.
2. waveguide at 4.5” will only load above 2.5k (and mostly 3kHz-6kHz)
3. if waveguide is pretty constant than treble output will be depressed unless the tweeter has a rising-response.
4. there are better waveguides to (3d) print.
What I’ve found when I tried to exceed 110dB was that thermal power handling was an issue.
I tested/pushed theScanSpeak D2604/833000 in standard form. This is a 4 ohm nominal tweeter, with a rated sensitivity of 93dB/2.83V. But it only achieves this around 1.5-2 Khz; at 10Khz it's drooped off to 91dB, but the breakup causes it to go to 95-96dB @ 20Khz.
Reference:
https://www.scan-speak.dk/datasheet/pdf/d2604-833000.pdf
I tested it up to 110dB, which is both the theoretical excursion and thermal power handling (93dB + 17 dB gain and 0.3mm x-max)
As you know, a waveguide will give you boost at the lower end and perhaps droop off the top end.
Edit:
Alexander tested it on a waveguide which shapes the response like this-
Reference:
https://heissmann-acoustics.de/en/test-scan-speak-discovery-d2604-833000-p-audio-pct-300/
With an extra 17dB gain with the rated 100W power handling, you may reach/exceed 115 dB at 2KHz, but at 10Khz/20Khz you will be at 111/110dB
I’m not sure you will achieve 115 at 8-16Khz on a 1” tweeter without more excursion or high power handling.
If you do decide to try this tweeter as a guinea pig, make sure you do some sweeps at short durations eg. ~1 secs with a good rest interval eg. 30 secs, otherwise you may let out the magic smoke. I've done this using long (10s) sine sweeps.
(https://www.diyaudio.com/community/threads/high-dynamic-range-104mm-dome-tweeter.386061/post-7020212)
I tested/pushed theScanSpeak D2604/833000 in standard form. This is a 4 ohm nominal tweeter, with a rated sensitivity of 93dB/2.83V. But it only achieves this around 1.5-2 Khz; at 10Khz it's drooped off to 91dB, but the breakup causes it to go to 95-96dB @ 20Khz.
Reference:
https://www.scan-speak.dk/datasheet/pdf/d2604-833000.pdf
I tested it up to 110dB, which is both the theoretical excursion and thermal power handling (93dB + 17 dB gain and 0.3mm x-max)
As you know, a waveguide will give you boost at the lower end and perhaps droop off the top end.
Edit:
Alexander tested it on a waveguide which shapes the response like this-
Reference:
https://heissmann-acoustics.de/en/test-scan-speak-discovery-d2604-833000-p-audio-pct-300/
With an extra 17dB gain with the rated 100W power handling, you may reach/exceed 115 dB at 2KHz, but at 10Khz/20Khz you will be at 111/110dB
I’m not sure you will achieve 115 at 8-16Khz on a 1” tweeter without more excursion or high power handling.
If you do decide to try this tweeter as a guinea pig, make sure you do some sweeps at short durations eg. ~1 secs with a good rest interval eg. 30 secs, otherwise you may let out the magic smoke. I've done this using long (10s) sine sweeps.
(https://www.diyaudio.com/community/threads/high-dynamic-range-104mm-dome-tweeter.386061/post-7020212)
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https://josephcrowe.com/blogs/news/horn-no-2007-with-peerless-oc25sc65-04
-with a much superior waveguide.
-tweeter doesn’t have a face-plate, but I’m sure you can make or print your own shim (and I think this will give you the best shot at a good coupling/interface):
https://www.parts-express.com/pedocs/specs/264-1018--tymphany-oc25sc65-04-spec-sheet.pdf
https://www.parts-express.com/Peerless-OC25SC65-04-1-Textile-Dome-Tweeter-264-1018?quantity=1
-with a much superior waveguide.
-tweeter doesn’t have a face-plate, but I’m sure you can make or print your own shim (and I think this will give you the best shot at a good coupling/interface):
https://www.parts-express.com/pedocs/specs/264-1018--tymphany-oc25sc65-04-spec-sheet.pdf
https://www.parts-express.com/Peerless-OC25SC65-04-1-Textile-Dome-Tweeter-264-1018?quantity=1
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Have you determined the required cone displacement to achieve 115 dB for each driver at its lower frequency limit? You might want to do that first.