Lightest cones in 8", 10", 12"

[Bill F.]

I'm hoping to tap into the hive mind here for some suggestions of drivers in the 8"-12" range with the lightest moving mass. (I see lightweight 15" is being covered in another thread right now.)

I'm looking at acoustic bandpass alignments in Hornresp, and achievable bandwidth seems to be limited mostly by Mmd.

I'm not limiting my search with other parameters like motor strength, Fs, etc. right now, just looking for a selection of the lightest moving masses in drivers between 8" and 12".

Thanks in advance for any and all suggestions!

Bill

PS. Is there a large driver database somewhere that's sortable by parameter? That'd be slick.

[StigErik]

The Lowther 8-inchers are all 8.75 grams. Pretty light!

(thats just 1/3 of the Seas Excel W22EX001 !)

[Glowbug]

Seas Exotic F8...http://madisound.com/catalog/product...oducts_id=8320

Only 10g.

http://www.madisound.com/catalog/pro...oducts_id=1474

23.1g for a 12" cone.

[Ron E]

Originally Posted by Bill F.

PS. Is there a large driver database somewhere that's sortable by parameter? That'd be slick.

If you search on Thiele small, one of the sites that comes up has a database. You may have to calculate Mms...

[Bill F.]

Thanks for the suggestions.

I'll share some I'm looking at:

RCF MR8N301 8" -- 10.1g
Eighteen Sound 8M400 8" -- 14.1g

Electro Voice EVM-10M II 10" -- 20.7g
Electro Voice EVM-DL10X 10" -- 25g

Fane Studio 12B 12" -- 29g
JBL 2152H 12" -- 30g

Any more candidates in the neighborhood?

[tinitus]

Do you want bass, or just midbass/midrange

[Bill F.]

I'm looking at how production cone midbass/midrange drivers behave with acoustic lowpass filters, anywhere in a range from about 80Hz up to about 1kHz. In-box resonance usually sets the midpoint of the passband. 2 octaves isn't too hard to get without rear-chamber porting, but I'm aiming at three or better, and that seems to demand very low Mmd.

[tinitus]

Strange driver
10gr mms and very high sensitivity
But seems to have very limited BW
http://www.rcf.it/it_IT/c/document_l...=DLFE-2228.pdf

Its no doubt intended, and other similar drivers seem to be the same
EMINENCE Beta-8A would seem like a better choise, and much cheaper, if 95db will do

I still have no idea what it is you talk about ?

[Bill F.]

Sorry for the unclear description.

If you imagine a 4th-order bandpass alignment for a subwoofer, that's the type of alignment I'm exploring in midbass and mid frequencies. Drivers are loaded by a sealed chamber in the rear and a ported "throat chamber" in the front. This front chamber of course creates a second-order acoustic lowpass filter function.

I simulated with the Beta 8A, and its useful bandwidth is pretty small in this application (Mmd/Sd is too high). But it gets much better when I arbitrarily lower the number in the Mmd field. \

That RCF MR8N301 simulates quite well in this alignment, with two octaves of useful bandwidth between 220 and 900Hz. Basically, it's intended as a mid horn driver, and I'm looking at it with the horn throat chamber but no horn flare. Call it a half-space horn.

[CLS]

RCF MR8N301 comes with its own 'backchamber', just like a seal-back midrange, just slightly larger volume.