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-   -   New DMA90-8 3.5in Al cone dual magnet (https://www.diyaudio.com/forums/full-range/338154-dma90-8-3-5in-al-cone-dual-magnet.html)

xrk971 20th May 2019 02:06 PM

New DMA90-8 3.5in Al cone dual magnet
 
I just saw this new Dayton driver and it looks like it has an interesting set of specs. Looks useful in MLTL, Karlsonators, and WAW/FAST use in general. At $18 not a bad price. There are also 2.5in and 4in variants.

https://www.parts-express.com/pedocs...tion-sheet.pdf

http://www.loudspeakerdatabase.com/D..._(Photo_1).jpg

http://www.loudspeakerdatabase.com/D..._response).png

Quote:

Resonant frequency Fs 88.2 Hz
Surface of the diaphragm Sd 38.5 cm
Effective diaphragm diameter 7 cm
DC resistance Re 3.8 Ω
Mechanical Q Qms 2.50
Electrical Q Qes 0.56
Total Q factor Qts 0.45
Efficiency bandwidth product EBP 157
Suspension equivalent air volume Vas 2.265 litres
Suspension mechanical compliance Cms 1030 m/N
Moving mass Mmd 3.1 g
Moving mass (including airload) Mms 3.2 g
Mechanical resistance Rms 0.7 Ns/m
Force factor BL 3.5 Tm
Voice coil inductance Le 0.3 mH
Maximum linear excursion Xmax 2.5 mm
Displacement volume at Xmax Vd 9.6 cm
Efficiency η₀ 0.27 %
Does anyone have any experience or listening impressions?

Godzilla 20th May 2019 02:49 PM

Yes, the driver caught my attention too. Unfortunately, I’ve packed up all my drivers and baffles after moving to another apartment. A cute little HomePod provides music for me now - and I wish I could alter its bassy character but enjoy it just the same.

If my H-frame was still setup I’d build a baffle for this new Dayton and give a listen. Instead, I hope to hear positive reviews for this relatively inexpensive driver. Will it be a giant killer or simply provide another good option to the other budget full rangers from TB, Fostex, Dayton, Vifa, etc...

perceval 21st May 2019 01:44 AM

Quote:

Will it be a giant killer or simply provide another good option to the other budget full rangers from TB, Fostex, Dayton, Vifa, etc...
I saw them too arriving in my email box.

My bet is on the latter.

That fall of -6dBs from 2.5k to 8k doesn't inspire confidence. It might take the life out of them. Probably best used with a small tweeter.

But specs look good for a MLTL indeed.

perceval 21st May 2019 03:58 AM

And it would be interesting to see how it fares against the new SBA 3" wideband driver... obviously not in the same enclosures though.

SB Acoustics :: 3” SB10PGC21-4<br><font color="#C70039">SHIPPING</font>

mayhem13 21st May 2019 04:38 AM

Quote:

Originally Posted by perceval (https://www.diyaudio.com/forums/full-range/338154-dma90-8-3-5in-al-cone-dual-magnet-post5797689.html#post5797689)
And it would be interesting to see how it fares against the new SBA 3" wideband driver... obviously not in the same enclosures though.

SB Acoustics :: 3 SB10PGC21-4<br><font color="#C70039">SHIPPING</font>

The new SB 3has my attention as well. The upper midrange slump of the Daytons is less than encouraging.

perceval 21st May 2019 05:34 AM

Plugged that new Dayton in a TL sim... run of the mill, nothing better than anything out there.

So, no magic down below, and the slump in the middle.
Not sure about this one.....

xrk971 21st May 2019 01:16 PM

I would buy it just for the cool looking basket with two Nd magnets :)

It’s so cheap I will get a pair to evaluate. Been a while since I bought a new fullrange driver anyway.

xrk971 22nd May 2019 01:57 AM

Ok, I ordered a pair (along with 4 more 3FE25-16 for another Karlsonator).

perceval 22nd May 2019 11:15 AM

Cool, and I'll order the little SBA WR then.

xrk971 22nd May 2019 12:47 PM

I'm thinking maybe even a flower petal OB like what Jeshi and Mattes did in this thread might be fun to try - have a removable center plate that allows swapping and testing various 2.5in to 3.5in drivers.

EVA foam for performance speaker enclosures

https://www.diyaudio.com/forums/atta...s-dsc02830-jpg

The reduction in baffle diffraction effects might be interesting to hear.


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