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Multi-Way Conventional loudspeakers with crossovers

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Old 25th July 2007, 11:41 PM   #1591
mige0 is offline mige0  Austria
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Default VVLOB / Virtual Very Large Open Baffle

Hi



Following the idea of Virtual-Very-Large-Open-Baffles, even better optimisation can be found when placing the speaker on edge somwhere in the middle of the baffle.



Click the image to open in full size.



The simulation ( sorry, still EDGE with slightly imprecise values until receiving A,B,C Dipole ) again shows a FR comparison for a 360 mm x 400 mm OB ( violet ) respectively a baffle of a closed box ( green ) and a OB 100 times this size ( red )



Click the image to open in full size.


All that is needed would be two planks from floor to ceiling and some sealing to the wall.
Much less ugly looking than the TANGRAM before, eh ?

NO dipole operation though.


Greetings
Michael
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Old 26th July 2007, 01:24 AM   #1592
herm is offline herm  United States
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The number of posts per page can be set in user preferences. If you delete your cookie, your preferences will revert to default.

1600 posts over 32 pages is 50 per page. While I haven't looked through the whole thread, my guess is that no posts have been removed...

Maybe the default changed?

Herm
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Old 26th July 2007, 01:29 AM   #1593
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And not a single piece of wood has been cut.....
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Old 26th July 2007, 04:20 AM   #1594
Pano is offline Pano  United States
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Quote:
Originally posted by Ray Collins
And not a single piece of wood has been cut.....
Discuss 1600 times. Cut once.
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Old 26th July 2007, 04:36 AM   #1595
Salas is offline Salas  Greece
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Quote:
Originally posted by Variac
The Silver Iris Augie looks like a lot of fun:

Wold work with a lot of the ideas here and for those people that don't require the huge output Lynn wants..

http://www.blackdahlia.com/html/tip_59.html

Also the link reminds us to be careful when comparing driver efficiencies

Olsher says in that link: ''Some of you may have noticed by now the discrepancy in sensitivity between the Augie woofer and the D5nf (89dB versus about 97dB) and must be wondering how is it possible to match these drivers without padding down the Feastrex full range? The answer lies partly in the subtlety inherent in the definition of sensitivity, which is not referenced to an actual watt at 1 meter, but rather to 2.83 V across the terminals of the loudspeaker. For an 8-Ohm load, that translates into 1 watt of power sunk into the load. However, in the OB2's driver transition region, the Augie's impedance is about 6 Ohms while that of the D5nf is 16 Ohms. For 2.83 V across the OB2's input terminals, the Augie is dissipating 1.33 watts to the D5nf's 0.5 watts. The power ratio amounts to about 8.5dB and means that the Augie is working that much harder to keep up with the D5nf. Add 8.5dB to the Augie's nominal sensitivity and you end up with 97.5dB. The proof is in the measured frequency response, which is shown below.''

But speakers are voltage controlled and not power controlled devices He probably drives from a 16 ohm tap also?
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Old 26th July 2007, 04:56 AM   #1596
BudP is offline BudP  United States
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Here is a pic of what I am brewing up with people who can cut more inches of wood than fingers, repeatedly. This is the "Does it all fit?" solid model. Next I try and strangle some flat panel measurements from it, one's that someone else can read.

Then, sawdust.

Bud
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Old 26th July 2007, 05:00 AM   #1597
Salas is offline Salas  Greece
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I like!
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Old 26th July 2007, 05:04 AM   #1598
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Quote:
Originally posted by salas

But speakers are voltage controlled and not power controlled devices He probably drives from a 16 ohm tap also?
I don't understand this comment - could you elaborate, please?
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Old 26th July 2007, 03:30 PM   #1599
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Good Pano....Cut Bait or Fish?!

Interesting BudP....

Ray
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Old 26th July 2007, 10:47 PM   #1600
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Default Re: VVLOB / Virtual Very Large Open Baffle

Quote:
Originally posted by mige0
All that is needed would be two planks from floor to ceiling and some sealing to the wall.
Much less ugly looking than the TANGRAM before, eh ?

NO dipole operation though.
Michael... I think that up against the wall speakers will be more in demand than dipoles.

Flat Panel Displays mounted onto the wall are becoming the main architectural feature in most homes. Getting great sound from up against the wall speakers could make one rich and famous.
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