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Multi-Way Conventional loudspeakers with crossovers

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Old 22nd October 2007, 09:03 AM   #2441
Pano is offline Pano  United States
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Default Re: Take a Peek

Quote:
Originally posted by Lynn Olson
This is the point I've been trying to make all along - dipoles don't have to be a "wuss" when it comes to impact, dynamics, and confident power-handling.

Well Lynn I'm sorry I didn't drag you down to the 5th floor in Denver to hear the big OBs. 4x12" per side. 3 of them powerful Eminence auto subs, 1 Beta 12LTA for the mids + a tweeter.

These things would flap your pant leg and you could feel the floor shake out in the hall. Not bad for OB. And bass drum and tympani were sweet - you could really hear the decay of the bass drum note, no box resonances to get in the way.

I've not heard bass that big and clean since the Onken-W cabs.

I'm sure the current Magantar project is as good or better. It can be done, and it's not that hard. (Just heavy)
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Old 22nd October 2007, 02:12 PM   #2442
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SunRa post #2447:

Quote:
…what do you think about the horizontal placement of the midrange drivers in magnetar's sistem…
FYI:
I made a couple of simple dipole point source simulations which of course isn’t the whole true but reveals a lot, at least within +- 15 degree azimuth.

Serious horizontal dispersion problems (+ summed localisation smear = wide central phantom at 10’, atan (8”/10’) = 3.8 degree horizontally) can be seen when using the horizontal placed 8” drivers + crossing over high at 2500 Hz if stereo, picture5 (5), but looks good at lambda x 0.75 or lower and if placed centrally, picture 4(5) as a mono speaker, even better.

The 5 x bass speakers works ok below lambda/4 and the stereo combing (observe at t=0 and no baffle or wall reflexes) at XO looks as expected (normal 200Hz combing with this speaker separation) and should perform well.

b

1(5)
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Old 22nd October 2007, 02:14 PM   #2443
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2(5)
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Old 22nd October 2007, 02:15 PM   #2444
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3(5)
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Old 22nd October 2007, 02:16 PM   #2445
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4(5)
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Old 22nd October 2007, 02:18 PM   #2446
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5(5)
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Old 22nd October 2007, 02:27 PM   #2447
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Thanks Bjorno! It will take me a wile to chew on those graphs
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Old 22nd October 2007, 03:52 PM   #2448
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Misstakes found, Sorry for the wrong lambda labels in just posted pictures!
This concerns 2(5) to 5(5)

b

new 2(5)
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Old 22nd October 2007, 03:53 PM   #2449
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new 3(5)
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Old 22nd October 2007, 03:55 PM   #2450
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new 4(5)
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