New Bliesma 142mm mid dome

[jzl]

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.

Not many at this cone size. Only i know is supravox 165 gmf

 

[momomo67890]

This mid is pretty out there In design was kinda shocked at its size unpacking it. Next to It is bliesma,kartesian 6.5 lom pa ,purifi 8 for scale.

 

[kouiky]

It look interesting.

Thing is, I don’t see the point in their shift from 8 to 6-Ohm nominal voice coils, other than it makes the driver appear more sensitive - they tested it at 2.83V, not 1W. The irregularity in the response between 1-2kHz leaves me questioning what is taking place in that region. I hope the distortion is better than it was with the M74 midrange. At this price, I would expect a full measurement set, not just the impedance and response as seen in the data sheet.

 

[tktran303]

@momomo67890

Do you have ability take distortion measurements for H2-H9; - at SPL level of 86dB@1m, 96dB, 106dB… and perhaps a stretch goal of 109dB of the 7” dome?

 

[studiotech]

Oh wow! That open ring magnet assembly is incredible. Reminds me of a woofer that used to be sold on Madisound probably 10+ years ago. Was very low profile, had a honeycomb diaphragm and a completely open magnet structure just like that. I think it was about 10" diameter, but I can't find it anywhere online after searching for about a half hour and have no recolection of the brand name.

 

[momomo67890]

I'll try to make a box tomorrow for it maybe measurements by end of week maybe mid next week.

 

[tktran303]

Oh wow! That open ring magnet assembly is incredible. Reminds me of a woofer that used to be sold on Madisound probably 10+ years ago. Was very low profile, had a honeycomb diaphragm and a completely open magnet structure just like that. I think it was about 10" diameter, but I can't find it anywhere online after searching for about a half hour and have no recolection of the brand name.

Prescient Audio Thindriver

https://audioxpress.com/article/prescient-audio-td-12-a-new-12-thindriver


disappeared into thin air (no pun intended)
I wonder what the founder is doing now…

 

[Boden]

How is the 142 mm dome suspended at the dome rim?

It looks as if there is a classic corrugated spider -to hold the VC in place I presume- , but I cannot detect the outside suspension because of the mesh.

 

[duvixan]

Isn't this just the Bliesma version of Accuton Cell ?

 

[momomo67890]

Looks like same basket and magnet but that's about it

How is the 142 mm dome suspended at the dome rim?

It looks as if there is a classic corrugated spider -to hold the VC in place I presume- , but I cannot detect the outside suspension because of the mesh.

the surround is a concave

 

[studiotech]

Prescient Audio Thindriver

https://audioxpress.com/article/prescient-audio-td-12-a-new-12-thindriver


disappeared into thin air (no pun intended)
I wonder what the founder is doing now…

Looks like this:

https://trulliaudio.com/

When your try the old Prescient website, it redirects to here. And they have a subwoofer listed with the suspiciously similar model number.

 

[momomo67890]

Yep look at their insta in a pic they got the sub sitting on a desk

 

[studiotech]

And there's this page too:

https://trulliaudio.com/pages/perimeter-driven-technology

 

[tktran303]

These perimeter driven drivers are not new. Yes Accuton has a few models in the CELL range with it, but not all.

eg.
C168-6-990-CELL
C90-6-724-CELL

Like all neo drivers, they are lighter than ferrite motors. But apart from being novel, I'd like to see some data of the purported benefits.

 

[kouiky]

I'd like to see what is going on in the 1.5kHz region by means of waterfall response and the distortion performance, at the very least. I don't know why these companies charge $1000/driver yet can't include measurements of their own products.

 

[momomo67890]

Audio is all about that wink wink cross fingers kinda energy 😉 . My box went incredibly badly went to cut hole router bit came loose cut a 1 inch hole when I needed 16mm so I switched sides of box cut hole 1/8th too small.

 

[ErnieM]

Isn't this just the Bliesma version of Accuton Cell ?

Pretty sure he designed for them before starting Bliesma.

 

[Boden]

Does anyone here know where to source the magnets used in the Bliesma, Accuton Cell ,Trillaudio type circular open motors?

 

[momomo67890]

Distortion at 104db at 3 ft distortion does rise a bit below 250hz 1 percent at 96db so I would say this driver is good between 250 and 2k. My box is not good at all I've already had to go to get weather stripping. Here's 104 94 89 I would say they are okay drivers.

 

[studiotech]

Thanks for those. Next time, try the CAPTURE button in REW instead of taking a photo of your screen.