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Multi-Way Conventional loudspeakers with crossovers

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Old 1st October 2008, 09:34 AM   #4491
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Old 1st October 2008, 10:13 AM   #4492
Salas is online now Salas  Greece
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Nice postage cost arrangement then. Really economic, Lynn. They are magnificent looking pieces and heavy guns in your arsenal.
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Old 1st October 2008, 10:27 AM   #4493
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Hi Lynn,

Been following along silently. When you have the compression drivers mounted to the horns would you be so kind as to post the resulting impedance measurement? I'm curious to see what it looks like.
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Old 1st October 2008, 03:02 PM   #4494
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Quote:
Originally posted by Lynn Olson
I'm looking closely at 2 or 3 of the AESpeakers Dipole 15's per side in a close-fitting array, with the Selenium 15PW3's as an alternative. If anyone from AESpeakers is reading this, what are the Xmax, Qts, Fs, normalized efficiency, and pricing of the Dipole15's again? Can't find it on the AESpeakers website right now.
Hi Lynn,

The info on the Dipole15's can be found on the archive page here:
http://web.archive.org/web/200302141.../DIPOLE15.html

Fs: 21.7hz
Qms: 15.2
Qes: 1.0
Qts: .94
Vas: 623L
Cms: /7mm/N
Mms: 90g
sd: 855cm2
Rms: .81Kg/S
Bl: 12.2Tm
Re: 12.3ohm
Z: 16ohm
Le: .15mH
Pe: 200w
no: .61%
1wSPL: 90.1dB
Xmax: 12mm

This drivers uses a 14mm long coil in a 38mm tall underhung gap. If you look at a BL curve, you have very good linearity all the way out to 12mm each direction and about 2mm more before you hit 70% of the rest BL value.

I'll be doing some experimenting soon with a pair of Dipole15 per side and our new 6.5" midrange. I'll be adding in the B&G Neo3 planar as the top end as it can also be used as a dipole when removing the cup.

We had a small price increase of $30 to all Lambda drivers in mid august. The 15's are now all $309. There is still a $50 per pair discount as caninus80 mentions.

John
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Old 1st October 2008, 03:39 PM   #4495
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Excuse my ignorance but what is the Magic about these Selenium15PW3s ? As I see it they will have extremly difficult to produce real low bass ?

/Erling
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Old 1st October 2008, 08:59 PM   #4496
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Default Results of Bjorn Kolbreks' BEM simulations


Here are Bjorn Kolbrek's first BEM simulations for the AH-160 (T=0.8) Azurahorn, which took 14 hours of run time. Bjorn is currently working on more simulations of the other models, and has given me permission to re-post his data here at DIYAudio.

The first graph is the polar response of the AH-160 from 100 Hz to 3 kHz.
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File Type: gif ah160_polar.gif (40.7 KB, 1249 views)
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Old 1st October 2008, 09:03 PM   #4497
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Default AH-160 Power Factor


The black line is the power factor (power going into the horn and then radiated into the room), and the red line is the percentage of power reflected back to the diaphragm.
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File Type: gif ah160_powerfactor.gif (19.7 KB, 1193 views)
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Old 1st October 2008, 09:48 PM   #4498
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Default Re: Results of Bjorn Kolbreks' BEM simulations

Quote:
Originally posted by Lynn Olson

Here are Bjorn Kolbrek's first BEM simulations for the AH-160 (T=0.8) Azurahorn,
Do you know how much of the driver that model includes?
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Old 1st October 2008, 09:53 PM   #4499
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No, I don't. Bjorn Kolbrek is now working on the AH-425 with and without a model for the 288 throat profile, so I would guess the graphs AH-160 shown thus far are probably showing the response of the horn by itself.

Here's the model for the AH-160 throat impedance, showing the resistive and reactive terms.
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File Type: gif ah160_throatz.gif (21.3 KB, 1103 views)
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Old 1st October 2008, 10:03 PM   #4500
Salas is online now Salas  Greece
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So its a 40deg symmetrical dispersion horn at 3kHz? How high are you planning to go with it?
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