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Multi-Way Conventional loudspeakers with crossovers

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Old 26th September 2010, 07:48 PM   #7351
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Originally Posted by Lynn Olson View Post
Just spoke to Gary Dahl on the phone; he's making good progress on the system integration, and is pleased with what he's hearing so far. More to come.
To amplify a bit further, Gary is a classical musician who plays in orchestras around the Puget Sound area, and has perfect pitch. He's owned Altec A7-828, Exemplars, the Ariels, Von Schweikart, and currently has Audio Note speakers. He's been doing a bit of listening in mono, and reports that the sound has the Altec-like midrange qualities of effortless ease and immediacy, but with much smoother response than the old-school Altec. Bass and treble are also good, from what he tells me. Rather surprisingly, even in mono, it has depth.

Anyway, it sounds like a promising start.
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Old 26th September 2010, 07:51 PM   #7352
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Anyway, it sounds like a promising start.
Glad to see it all coming together.

Rob
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Old 26th September 2010, 09:45 PM   #7353
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Quote:
Originally Posted by Lynn Olson View Post
To amplify a bit further, Gary is a classical musician who plays in orchestras around the Puget Sound area, and has perfect pitch. He's owned Altec A7-828, Exemplars, the Ariels, Von Schweikart, and currently has Audio Note speakers. He's been doing a bit of listening in mono, and reports that the sound has the Altec-like midrange qualities of effortless ease and immediacy, but with much smoother response than the old-school Altec. Bass and treble are also good, from what he tells me. Rather surprisingly, even in mono, it has depth.

Anyway, it sounds like a promising start.
It would be a amazing to me if this system would sound the least bit coherent.

Carry on...
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Old 26th September 2010, 10:35 PM   #7354
jacq. is offline jacq.  Canada
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For your reading pleasure;

6moons audio reviews: Living Voice Vox Olympian
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Old 26th September 2010, 10:56 PM   #7355
Elias is offline Elias  Finland
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Hi,

I like the color scale I choose because it represents the most natural colors for human eye, the electromagnetic spectrum. Anything else is gimmickery.

Click the image to open in full size.


It's made in nature in rainbows, halos, glories etc.

Click the image to open in full size.

Click the image to open in full size.



- Elias
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Old 26th September 2010, 11:02 PM   #7356
Elias is offline Elias  Finland
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Originally Posted by Lynn Olson View Post
Rather surprisingly, even in mono, it has depth.
Hi,

I don't find mono depth surprising since I experience it conctantly with my dipole line array (in one speaker mono). Depth is perceived if there is enough 'ambiance' in the recording. High speaker directivity allows it to be heared and not be spoiled by the listening room.

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Old 26th September 2010, 11:36 PM   #7357
soongsc is offline soongsc  Taiwan
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Quote:
Originally Posted by Lynn Olson View Post
...Bass and treble are also good, from what he tells me. Rather surprisingly, even in mono, it has depth.

Anyway, it sounds like a promising start.
Normally this quality would be associated with good CSD and low distortion. Very good.
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Old 27th September 2010, 12:40 AM   #7358
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It would be a amazing to me if this system would sound the least bit coherent.

Carry on...
Well, the diameter of the AH425 is 16.5", and it is matched to a 15" widerange woofer. The measured acoustical crossover is around 700~750 Hz, and the drivers are about a wavelength apart. The AH425 presents a resistive air-load for the compression driver down to about 500 Hz.

The measured (not calculated) phase match between the drivers at crossover is 5 degrees or better; the null with the drivers reversed-phased is 25 dB deep, and the slopes of both sides of the null are symmetric. When put in-phase, response is flat through the crossover region, and off-axis response is smooth as well.

The data Gary has sent me looks looks good for a system using large-format woofers and compression drivers, and the subjective reports are matching the objective data. Definitely in a different class than an Altec A5, more like a JBL Everest system, but with a simpler crossover. The woofer only needed one modest notch filter, and the horn did not require shelf equalization or a notch filter, rather impressive for a 1.4" format driver. Response ripples predictably start above 8~10 kHz, although they are smaller in magnitude than I expected, probably thanks to the damping of the Mylar diaphragm surround of the Radian 745P.

It would be interesting if the TrueExtent beryllium diaphragms were available for the Altec 288 or Radian 745P drivers; this would offer response beyond 15 kHz without a supertweeter. Considering the not-insignificant cost of a beryllium diaphragm, a high-efficiency ribbon supertweeter offers more extended response (beyond 50 kHz for the RAAL) and better horizontal dispersion.

Last edited by Lynn Olson; 27th September 2010 at 01:08 AM.
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Old 27th September 2010, 01:18 AM   #7359
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The upper-mid horn is a little startling - surely the dispersion couldn't be more than 10 degrees? With a conical profile, it would drop like a rock outside the dispersion window, so there would be an on-off impression as you moved laterally (or vertically). The directivity indexes of the 4 drivers look wildly different; designing the crossover wouldn't have been any fun.

Cast bronze looks classy, I have to give it that, and the wood midrange horn is a work of art. Would have been nice if there were some measurements instead all the pictures taken from weird angles.

Last edited by Lynn Olson; 27th September 2010 at 01:28 AM.
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Old 27th September 2010, 01:35 AM   #7360
Pano is offline Pano  United States
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Good news on Gary's system, Lynn. Can't wait ot hear more progress reports. Too bad I'm no longer in the neighborhood, I'd pop over to hear it.

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What about yellow -> green -> blue -> purple -> Red ? What you want is a scheme like "Jet" which only varies one color at a time, then another one and so on. Otherwise its a complex mess.
I would leave out red altogether as a pure color - probably. But yes, I do like starting with yellow as the highest level because it looks the brightest. Then down into green, aqua, blue and maybe black at the lowest point. The idea is to have what looks brightest to the eye represent the high levels and the dark colors the low levels. Unfortunately that does not follow the visual spectrum - the eye does not work that way. I'll try some color gradients and present them for our amusement. =)
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