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Old 29th May 2005, 11:30 PM   #1
amt is offline amt  United States
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Default Gilmore - hows it done?

I just got off the phone with a friend that heard a pair of Gilmores and hes in love. I did some research and it appears that they have gotten great reviews and aside from the cost, seem to be very straightforward.

Four woofers, one ribbon and a passive xo, all mounted on a piece of Corian. How can they perform so well without all the normal electronic equalizing and biamping etc and also be 90db efficient?? And shouldnt these be clonable?

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Old 29th May 2005, 11:34 PM   #2
Mark Kravchenko --- www.kravchenko-audio.com
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Default No EQ????

It's a little hard to believe that they get the low end response that they claim without dipole EQ on the low end.

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Old 30th May 2005, 12:16 AM   #3
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I saw their ad in a magazine. Some geeky looking old guy and a young, shapely female with silicone balloons and some text about getting lucky.

It sure made me want to go out and get some!

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Old 30th May 2005, 12:48 AM   #4
amt is offline amt  United States
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Yes, I believe that ad campaign wasnt the best way to sell $20K speakers, but Im interested in how he gets -3db @ 17hz with 91.5db using just a 4th order L-R passive xo. Passive eq?

http://www.glacieraudio.com/new%20Gl...081_eprint.pdf

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Old 30th May 2005, 07:15 PM   #5
azrix is offline azrix  United States
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It's also VERY hard to believe that they can keep that low end response very loud. The woofer is going to be excursion limited very early that low, compared to the 120+ dbs they say it can do.

They use very high q woofers which allows you to sort of get away with not having an eq. There's and old Carver dipole that does the same thing. Talking about a Qts of around 2.0 or greater. No idea how well it works.

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Old 31st May 2005, 06:18 AM   #6
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Default How do they do it?

Just for the record, they are very nice balloons! Regards moray James.
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Old 31st May 2005, 02:47 PM   #7
amt is offline amt  United States
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I dont believe Ive ever seen a bass driver with that high of a qts. Ive heard the Amazing Loudspeaker years ago at the CES and very pretty impressed at the time. I would assume that high qts drivers are a custom build and arent readily available. And it looks like a B-G planar, similar to the Carver concept, is what is used. So it looks like those 12" woofers are key to the operation of the thing. If it truely sounds that good, it sure is a KISS design.

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Old 31st May 2005, 03:42 PM   #8
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At 17Hz (and well higher in frequency too) with no enclosure to trap the back wave, those cones will be really pumping at extreme excursions! I doubt that really loud levels can be achieved down low with so much dipole cancellation, no matter how high the Qts is, and there's bound to be large harmonic production and compression going on. You can't fool Mother Nature.

These speakers may sound great despite these limitations - I don't know since I haven't heard them. And, yes, the balloons are very nice.
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Old 1st June 2005, 12:26 PM   #9
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Default How it's done...

by giving the marketing guy one to many martinis at lunch time.

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Old 1st June 2005, 05:21 PM   #10
Gregm is offline Gregm  Europe
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Default Re: How it's done...

Quote:
Originally posted by I_Forgot
by giving the marketing guy one to many martinis at lunch time.
And /or by generating some inefficency with a low pass really low. Say 1st order @~20-30 Hz?

How sensitive is the B&G anyways (~88?)
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