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Old 6th November 2008, 07:21 AM   #4701
Kolbrek is offline Kolbrek  Norway
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Default Re: Re: OSWG BEM simulation

Quote:
Originally posted by gedlee
Thank you very much for this. From your data I am assuming that the mouth of this waveguide would be 10", my smallest. I have data for this device and I will post it as a comparison, but I should also say that this waveguide is the worst of the bunch being just too small. The 12" and 15" devices are much better.
It was actually supposed to be the 15" version, but I may have misunderstood something. I took it that the radiused mouth ended at 15", but if it is the diameter of the waveguide before the radiused mouth that set the quoted size, then this would be a 11" WG.

Quote:
Originally posted by gedlee
But at any rate I'd have to say that you have achieved all of the pertinent features that I find. First the constant directivity, and the -6 dB / oct HF loss is typical. The lowest resonance peak is "tamed" by the HP filter and the next one, which I don't typically see this strong (but I use foam remember) needs a second tank circuit to control. The hole on axis is now quit accurate.

I'll dig up my data and post it.

Good to see that the simulation came so close. As you say, some of the differences between measurements and simulation is likely to be because the driver parameters are off.

Bjørn
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Old 6th November 2008, 12:39 PM   #4702
gedlee is offline gedlee  United States
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Default Re: Re: Re: OSWG BEM simulation

Quote:
Originally posted by Kolbrek


It was actually supposed to be the 15" version, but I may have misunderstood something. I took it that the radiused mouth ended at 15", but if it is the diameter of the waveguide before the radiused mouth that set the quoted size, then this would be a 11" WG.

Bjørn
Bjorn

Yes, my "specs" refer to the waveguide mouth diameter before the radius. The 15" is actually 18" across, etc. So what you did was closest to a 10" whose data I showed.
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Old 8th November 2008, 12:40 PM   #4703
chasmo is offline chasmo  United States
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Hello Lynn.

I built a pair of the original Ariels years ago, and one of the the D2900's (sticky dome) finally quit on me.

Any recommendations for a more up-to-date replacement?
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Old 8th November 2008, 02:23 PM   #4704
datesx is offline datesx  Hungary
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Default Possible Ariel dom d2905 replacement?

http://shop.ebay.de/items/?_nkw=scan...+dom&_osacat=0

Regards, datesx
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Old 8th November 2008, 03:59 PM   #4705
gedlee is offline gedlee  United States
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Bjorn

Sorry for the delay, here is the impedance curve for a DE250 on a waveguide.

Click the image to open in full size.
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Old 10th November 2008, 06:07 AM   #4706
Kolbrek is offline Kolbrek  Norway
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Where?
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Old 10th November 2008, 12:37 PM   #4707
gedlee is offline gedlee  United States
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Bjorn - it is in the post. Can't you see it? It can be copied and printed from there if you want.
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Old 10th November 2008, 01:01 PM   #4708
Kolbrek is offline Kolbrek  Norway
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No, strangely enough I can't see the image in your post. I can see the frequency response plots in post #4706, and images in earlier posts too, but not this last one.

Checking... I can see it with Internet Explorer, but not with Firefox. Odd.

Saving the file from IE, it has a *.wmf extension. That may be the reason Firefox doesn't display it.

So now I got it, thanks!

Bjørn
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Old 20th November 2008, 09:15 PM   #4709
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Default New Dipole Drivers on their way


John J of AESpeakers sent an e-mail telling me that the Dipole15 variants are on their way. Here are the measured parameters of the new drivers:

Fs: 33hz
Qms: 31.28
Vas: 325L
Cms: 0.31
Mms: 75g
Rms: 0.49
Xmax: 9mm
Xsus: 10mm
Sd: 855 sq. cm.
Qes: 0.98
Re: 3.1ohm (parallel)
Le: 0.058mH
Bl: 7Tm
Qts: 0.95
1W SPL: 92.75dB

Since the drivers were fresh off the line when measured, after break-in the compliance should increase a bit, which will lower Qts and and Fs in turn. (Not much, but some.) Sonically, they should be similar to the TD15M's, with the TD15M extended pole piece, cone, spider, suspension, and underhung voice coil.

Although I plan to use a quartet of these drivers for the OB bass modules (covering the range between deep bass and the dipole peak of the 12" driver), the smooth response (extending out to 5 kHz) should make them suitable for a simpler OB system that uses one or two of these Dipole15 variants and a HF driver above.
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Old 20th November 2008, 09:50 PM   #4710
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Sorry for the long delay in posting. I've been steering the good ship SS Retirement in heavy seas, and it has taken my full attention. Here are some items I've come across that shine a little light on what's been happening:

The End of Wall Street
A real eye-opener - I didn't know, for example, that the securities-ratings firms were engaged in massive fraud, routinely re-rating junk-grade mortgages from BBB up to AAA, re-packaging and re-selling them to unwary institutional investors, and clouding the paper trail back to their real origins. This article, although dense, is a must-read for background on what's happened in deregulated financial markets over the last twenty years.

The chart below is from Calculated Risk, one of my daily-reads. I don't personally think we're headed for a Great Depression, but the economic data isn't pretty. If one or more of the Detroit automakers fails, the descent (in the real economy) will steepen.

The real question is where the market bottom is - right now, in January, or some time later in 2009. One ray of light from the recently concluded G20 conference is the agreement on the need for worldwide economic-stimulus programs, preferably in large-scale infrastructure improvements. With any luck at all, the turnaround could be very rapid - there's 12 trillion dollars sitting on the sidelines (parked in T-bills) waiting for conditions to improve. This money will move very fast once the credit markets clear and real economy shows signs of turning around.

My tiny little contribution to the audio-infrastructure goes forward - fortunately, the recent purchase of the quartet of AESpeaker drivers completes the big-investment part of the project. The rest comes down to baffle-boards and measurements.
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