Posted on the DIY Loudspeaker pad on Facebook.
Solen have listed the new Bliesma 142mm "mid domes" in Paper and Aluminium form.
https://www.solen.ca/en/brands/bliesma/products
These look a curious beast maybe to bridge between a woofer/subwoofer and their M74 upper mid domes or with the aluminium possibly their T34 tweeters in a wave guide.
Any bets on the price of a Beryllium version 😱
Solen have listed the new Bliesma 142mm "mid domes" in Paper and Aluminium form.
https://www.solen.ca/en/brands/bliesma/products
These look a curious beast maybe to bridge between a woofer/subwoofer and their M74 upper mid domes or with the aluminium possibly their T34 tweeters in a wave guide.
Any bets on the price of a Beryllium version 😱
No, it i a special midrange unit!
Features :
• 142 mm aluminium/paper dome developed together with Dr. Kurt Müller GmbH & Co.
• Extremely low moving mass for better transient response and higher efficiency
• Fully saturated neodymium motor with copper sleeve for low non linear and modulation distortion
• Single-layer ribbon CCAW voice coil for lower inductance • Underhung voice coil wound on titanium former
• 137 mm voice coil for low thermal compression
• Ring magnet system with large rear opening reduces backside reflections and improves dipole operation
• Natural silk surround and cotton spider from Dr. Kurt Müller GmbH & Co. for higher midrange resolution
• Surround hidden in basket rim allows significant reduction of mounting diameter
• Thick aluminium powder coated basket
• Gold plated wire terminals
• Recommended frequency range 180 Hz - 2,8 kHz for A and 180-2,2kHz for P
Manufacturer highlights them as open back unit, and even publishes rearside response!
Price is also Bliesma, 1300 CAD
https://solen.ca//storage/media/JpBysFM7QjgTPs9Xl6iJPNJqOkcaquiMjycnNKjL.pdf
Features :
• 142 mm aluminium/paper dome developed together with Dr. Kurt Müller GmbH & Co.
• Extremely low moving mass for better transient response and higher efficiency
• Fully saturated neodymium motor with copper sleeve for low non linear and modulation distortion
• Single-layer ribbon CCAW voice coil for lower inductance • Underhung voice coil wound on titanium former
• 137 mm voice coil for low thermal compression
• Ring magnet system with large rear opening reduces backside reflections and improves dipole operation
• Natural silk surround and cotton spider from Dr. Kurt Müller GmbH & Co. for higher midrange resolution
• Surround hidden in basket rim allows significant reduction of mounting diameter
• Thick aluminium powder coated basket
• Gold plated wire terminals
• Recommended frequency range 180 Hz - 2,8 kHz for A and 180-2,2kHz for P
Manufacturer highlights them as open back unit, and even publishes rearside response!
Price is also Bliesma, 1300 CAD
https://solen.ca//storage/media/JpBysFM7QjgTPs9Xl6iJPNJqOkcaquiMjycnNKjL.pdf
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Maybe it's better as there is less variation in temperature?is it not terrible to have such large voice coils for linearity ?
Why not smaller voice coils and flat "cones" ? A la Sony in the 80s'
This is an unusual driver, but it has some serious lower midrange / upper bass capability.
Sd = 180 cm^2, that is more surface area than a 7" woofer, and almost as much as an 8" woofer.
Fs = 65 Hz, when most typical dome midranges are 300 Hz +
Qts = 0.3, Vas = 25 liter... more like a midwoofer than a dome.
The sensitivity of 95 dB/2.83V makes this driver pretty unique. I know of no cone driver with this high sensitivity AND an Fs below 70 Hz.
Sd = 180 cm^2, that is more surface area than a 7" woofer, and almost as much as an 8" woofer.
Fs = 65 Hz, when most typical dome midranges are 300 Hz +
Qts = 0.3, Vas = 25 liter... more like a midwoofer than a dome.
The sensitivity of 95 dB/2.83V makes this driver pretty unique. I know of no cone driver with this high sensitivity AND an Fs below 70 Hz.
That Dayton PM220-8 neo is an interesting driver which I was not aware of. Indeed it does have a sensitivity of 95 dB and an Fs below 70 Hz... 49 Hz in fact.
However, it starts breaking up at 2k, and the response is ragged from that frequency on up. I would not use the driver above 1.2k. Nonetheless, it does fill a niche, and if used from 100 - 1000 Hz it seems like a very nice driver.
The Bliesma M142A on the other hand, starts breaking up at 5.5k. I would use that driver up to 3k.
j.
However, it starts breaking up at 2k, and the response is ragged from that frequency on up. I would not use the driver above 1.2k. Nonetheless, it does fill a niche, and if used from 100 - 1000 Hz it seems like a very nice driver.
The Bliesma M142A on the other hand, starts breaking up at 5.5k. I would use that driver up to 3k.
j.
it was reviewed some time ago
https://audioxpress.com/article/test-bench-dayton-audio-pm220-8-wideband-neodymium-8-woofer
If breakup above say 5 Khz and low Fs are the design target, any properly designed 4-5" paper or alu coned driver will do the job. All that is required is that manufactureres would use a somewhat more beefed up motor in order to increase sensitivity. A very suitable candidate would be the Vifa NE149: a virtually blameless driver.
But hey, this echoes the recent discussion about the applicability of 3" domes versus 3-4" cone drivers..
But hey, this echoes the recent discussion about the applicability of 3" domes versus 3-4" cone drivers..
I see very little point in such a large diameter dome driver having a relatively limited operating range and not utilizing a double suspension as found in cone drivers.
A decent 6" pro sound driver would be a better choice performance wise, as it can be used down to Fs (xmax permitting) and wouldn't potentially suffer from diaphragm rocking modes. The upper cutoff isn't anything special to achieve. The SB Audience 6MW150D gets close performance wise and costs less than $100.
A decent 6" pro sound driver would be a better choice performance wise, as it can be used down to Fs (xmax permitting) and wouldn't potentially suffer from diaphragm rocking modes. The upper cutoff isn't anything special to achieve. The SB Audience 6MW150D gets close performance wise and costs less than $100.
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It’s evidently very hard to get
1) High sensitivity (approaching 100dB/2.83V)
2) Flat and smooth amplitude response (200Hz to 2KHz) (hint: look at zoomed impedance plot)
3) Low non-linear distortion (HD&IMD)
PA drivers generally do 1) & 3)
Hifi drivers seem to do 2) & 3)
I’d like to see if Bliesma can address the blip in the impedance/amplifiude response about 1KHz.
1) High sensitivity (approaching 100dB/2.83V)
2) Flat and smooth amplitude response (200Hz to 2KHz) (hint: look at zoomed impedance plot)
3) Low non-linear distortion (HD&IMD)
PA drivers generally do 1) & 3)
Hifi drivers seem to do 2) & 3)
I’d like to see if Bliesma can address the blip in the impedance/amplifiude response about 1KHz.