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Multi-Way Conventional loudspeakers with crossovers

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Old 8th October 2012, 04:18 PM   #8221
DougL is offline DougL  United States
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Lynn,
From your answer, I see I phrased the question badly.
Did you consider a .5" Compression driver / horn as a super tweeter?
As far as I know, only B&C makes one.
It sounds like it would work, but you never know.
If you use an approprate horn profile, it should retain much of the character of the mid-range horn..

Doug
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Old 8th October 2012, 05:34 PM   #8222
badman is offline badman  United States
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How much you can push a horn depends a lot on the listener tastes and room- JBL for example specs the 1" exit 2426 to 500Hz in a level-limited app- I've run it just a smidge below 1k on a large 90 degree conical OSWG, and never felt I was asking too much from the phragm.

I agree with the decade rule, however, and never did try to get much above 10k out of it (the response dies there anyway and I needed to preserve sensitivity).

A fella can achieve high sensitivity from the Heil AMT1s by waveguiding it, which actually will do 1k-20k at around 96dB quite nicely, but it's not by any stretch a traditional horn, just a waveguide determining coverage pattern and terminating the device properly instead of with the hard edges. It buys a few dB in the low end of its response, letting you suppress that with the XO and get more SPL per watt and diaphragm displacement.
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Old 12th October 2012, 10:32 PM   #8223
Pano is offline Pano  United States
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Just a brief update:
Thanks for the advice on the Stanton 681, Lynn. I have it running now with a new conical stylus and it seems rather nice. Seems a good fit for the mass of the Grado maple arm. Surface noise is much reduced from the Shure MM cart I had before.

Balance between channels is near perfect - just a small fraction of a decibel difference Left to Right. I checked it on two mono pressings, a Decca from 1949 and an RCA from 1968. Tracking force is now at 2.7g. Might need to adjust that for best tracking - but it's not bad now. Will check with the Shure tracking LP which came with the record collection.
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Old 13th October 2012, 01:39 AM   #8224
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Hi ... ports are a pain. Lynn says he is using a distributed port which could be close to Onken style if I guess correctly. I see nothing about using larger conventional ports with the exception of box depth limits and frontal area fit considerations. All programs just use a "no-noise" approach for minimum size. Where is some data on larger vent area ports? I would like to use many 2" or 3" dia ports on a 16 cu ft 2x15 box.
Onken, though not conventional, uses up to 85% of Sd and does pretty will as my 1954 Jensen Ultraflex's attest to.
Thanks, Zene

Last edited by Zene Gillette; 13th October 2012 at 01:41 AM.
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Old 13th October 2012, 02:39 AM   #8225
Pano is offline Pano  United States
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Cool. Got pix of the Ultraflex? What's the driver?
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Old 13th October 2012, 05:00 AM   #8226
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Pano ... pics would be banned by moderator. I never finished, just modified for a 15", braced the hell out of it and threw in a Paudio 150 I had extra so is not a good match. Front full of white filler and no grill. Not something I would want to show. Lacks bass as you might expect but otherwise not bad. As soon as I get a decent bass up and running I will finish and then can display.
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Old 13th October 2012, 03:49 PM   #8227
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For your inspiration:
Click the image to open in full size.
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Old 13th October 2012, 03:54 PM   #8228
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Beautiful. What are the drivers and do you have a build thread?
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Old 13th October 2012, 04:20 PM   #8229
hum4god is offline hum4god  United States
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Quote:
Originally Posted by buzzforb View Post
Beautiful. What are the drivers and do you have a build thread?

this is a bd-design reference compact bass w/ their own bd15 driver .
more information and plans somewhere on the webpage or forum .

BD-Design - Orphean MkII
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Old 13th October 2012, 07:05 PM   #8230
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Originally Posted by Nelson Bass View Post
For your inspiration:
Click the image to open in full size.

Timely...I am inspired
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