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Aucharm UR330B8-11F full range 12" cabinet ideas?
Aucharm UR330B8-11F full range 12" cabinet ideas?
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Old 7th October 2018, 08:17 PM   #1
Lingwendil is offline Lingwendil  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
Default Aucharm UR330B8-11F full range 12" cabinet ideas?

So, I managed to grab a pair of these during the raffle at Burning Amp 2018. They are large, and a simple test session shows that they sound very, very nice open air. I would like to actually build them up an use them, and was wanting to find a nice design that can easily be built with decent plywood. I have sporadic and limited access to advanced woodworking tools at my work, but can manage on many things. I can't do curved walls or anything too complicated. I really, really want to use these in something!

Very little info is available for these online, but I did find this, where Papa Pass mentions them-
A poor man Feastrex !

Here is a product listing for the drivers, mine is the white cone, not that it matters much
声韵12寸全频钴磁喇叭hifi发烧钢磁铝镍钴扬声器超古董全频非同轴

Here are the relevant specs, straight from the datasheet, I've also attached the full PDF-


Aucharm UR330B8-11F full range 12"

Impedance : 8 Ohm
Minimum Frequency Response: 34 Hz
Reproduction Frequency Response: Fo~18K
S.P.L. : 92.806 dB/W(m)
Rated Input : 30W
Music Power : 45W
Equivalent Diaghram Radius: 132mm
Equivalent Mass : 26.419 g
Magnet Weight : 1100g
Net Weight : 11900 g
Fs : 34.942 Hz
Re : 7.2 Ohm
Mms : 32.964 g
BL : 8.135 TM
Qts : 0.691
Qms : 5.647
Qes : 0.787
Vas : 228.816 Ltr

That high Qts seems to be pretty damning is my first impression.

I initially asked Xrk971 to try a sim for a karlsonator, here in the Karlsonator thread, and unfortunately the driver is ill suited to such an application, and would need to be prohibitively large, with wonky performance for the effort. Something along the lines of a 1.5x~2x scaling! He suggested a Rondo style cab, but I'm not sure I could do the teardrop shape, other than maybe an angular approximation? His initial suggestion was maybe 16in W x 24in deep x 60 in tall... 4in gap on floor, which is a little taller than I would like to do...

Click the image to open in full size.


What would be a decent cabinet design that would not be excessively large for this driver? Ideally I would like to do some sort that would have the driver approximately ear level to seated listeners. Maybe some sort of back-loaded horn? I'm not interested in large open baffle types, as I just plain don't have the space for it, and don't really care for them all that much personally. She who must be appeased must also be taken into account


There are a few goofy suggested(?) designs on the product page as well, and other than the "Canterbury" style, they all look pretty much to be oddly sized. I'll attach a few for reference, just in case the product listing disappears later. Something of a similar form factor would be nice, and I can go maybe 18" deep, maybe 20~24" wide, by 32~36" tall I suppose, but depending on what works I can be a bit flexible on things. I really wish I had a PC that I could set up some simulation software on, I don't have access to a windows machine for more than an hour or two a night at home, and what I do have is old and tired. Everything I can use at work is Chrome OS, so unless I find some sort of web-based solution I don't really know of much, other than basic vented/sealed box calculators.

So, what do you guys think? Any ideas? Maybe just a basic version of the "Canterbury" with some nice stain? Could double as a stand for a small aquarium to take up less space
Attached Images
File Type: png impedanceplot_UR330B8-11F.png (515.3 KB, 275 views)
File Type: png freqrespons_UR330B8-11F.png (493.5 KB, 268 views)
File Type: png dedQ15h1KGz.png (737.1 KB, 262 views)
File Type: png inXtq1tG9JE.png (815.7 KB, 259 views)
File Type: png zX2y5QyCtJG.png (690.6 KB, 45 views)
File Type: png 1Knxbimp7Tu.png (148.7 KB, 54 views)
Attached Files
File Type: pdf UR330B8-11Fw.pdf (179.9 KB, 16 views)
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Old 7th October 2018, 08:36 PM   #2
KaffiMann is offline KaffiMann  Norway
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Just looking at the specs, I'd say as large a sealed box as you can tolerate/without running into trouble with the boss. Any sort of ported design would probably be large.
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Old 7th October 2018, 09:20 PM   #3
xrk971 is offline xrk971  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
Maybe a large Nautaloss sealed spiral TL?

Click the image to open in full size.

The Nautaloss Ref Monitor
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Old 7th October 2018, 09:36 PM   #4
Lingwendil is offline Lingwendil  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
Hmmmm. Foamcore for the spiral, with 1/2" plywood sides? If people can get away with building 48" cornus with foamcore channels, I bet that might work here with some added bracing, you think? I can double layer the initial sections as needed. This is actually a very interesting idea!


How big? Looking at sealed box ideas I may be able to build something with a 28" wide, 44" high, 17" deep sort of form factor, with maybe .88 system Q, which may be too high I'm thinking? That's already a 350L box, not counting the driver displacement, and that's already getting pretty big. Any smaller box and I'm thinking it would make the bass too warm and boomy.



I think I should have been looking more at 8" class drivers at the raffle, but I had poor reception so couldn't pull up driver info easily before the time to grab was happening I'll make these work somehow lol.
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Old 7th October 2018, 09:38 PM   #5
GM is offline GM  United States
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Karlsonator

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Old 7th October 2018, 09:47 PM   #6
Lingwendil is offline Lingwendil  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
Quote:
Originally Posted by GM View Post
Is there a way to move the posts over here?

Quote:
Originally Posted by GM View Post
Call me old fashioned, but vintage type drivers seem to work well in vintage spec cabs with best overall power handling short of a BLH, especially if tube driven, so thinking a Vb = Vas/1.44 tuned with a vent area [Av] = [Sd] and damped to 'taste'. Worst case is one winds up stuffing it enough to be a 'Pensil' type alignment.

Assuming a ~38" seated ear height minus 1.5" thick base = ~63.37" x ~153.14"^2 WxD, ~547.39"2 vent x 0.75" baffle thickness with driver, vent offset = ~26.87", ~53.74" from top. All dims inside [i.d.].

GM
Are those dimensions in inches accurate? 153 inches?

I'm having a hard time visualising this...
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Old 7th October 2018, 10:15 PM   #7
Lingwendil is offline Lingwendil  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
Quote:
Originally Posted by freddi View Post
you could poke one in a sealed box - for the cap to work, amp output Z needs to be low

a semi open back box (one patent showed a "K" slot)- maybe aperiodic

I think it would work in a sealed - aperiodic vent back chamber K - my Fane 12FR didn't have any noticeable peaking (nor bass) in a K12 with slit vents damped

GM's idea sounds good - lots of wood - What would G.A. Briggs done for this speaker?

Click the image to open in full size.
What's the cap for?

I'm a tube guy, so keep in mind I will have transformer coupling to most of my builds. I can do flea power just as easily as I can do 20-25 watts with what I have on hand. I generally run push-pull with global negative feedback. I can do pretty respectable damping factor , especially with my preference to low-impedance tubes for moderate power applications, such as the EL86 and an upcoming horizontal sweep build using the 12AV5GA.



Hmmm. Aperiodic sounds interesting. I vaguely remember trying this out with plastic mesh sandwiching bits of wool stuffing a while bag, with somewhat favorable results.
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Old 7th October 2018, 10:29 PM   #8
freddi is offline freddi  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
maybe someone here can guess how this arrangement of an open top pipe might work in practice - - one variant for the rear slot is "K-ish"



US3138220.pdf

Last edited by freddi; 7th October 2018 at 10:33 PM.
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Old 7th October 2018, 11:03 PM   #9
Lingwendil is offline Lingwendil  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
You mean this one?

Aucharm UR330B8-11F full range 12" cabinet ideas?-bcwbgfcttgj-png


I like it. Kind of an almost-open baffle. Wonder how far from the wall it would need to be to perform well, and if closing the top would adversely effect it? I bet it would sound pretty neutral about 18~20" away from the wall, and with some felt or carpet padding type of lining on the inside of the box/wings.
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Old 7th October 2018, 11:28 PM   #10
freddi is offline freddi  United States
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Aucharm UR330B8-11F full range 12" cabinet ideas?
yeah - I wonder how such a top open pipe would do if the 2-sides and back were made out of perforated Masonite? - subjectively that might sound more open
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