THE MAKING OF A BRYSTON MODEL T SPEAKER

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James Tanner

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Re: THE MAKING OF A BRYSTON MODEL T SPEAKER
« Reply #20 on: 1 Jul 2015, 12:53 pm »
James ... Fill in the screw pockets flush with the tweeter flange.
http://www.audiocircle.com/image.php?id=123629

The large mounting bolts may be acoustical far enough away, but those screw pockets are way too close for comfort.
Simple test, use some blue tack as filler to completely smooth tweeter flange.
I'll bet you a days pay that this will make a measurable and audible improvement.

It's the little things that makes it extra special.
Shawn

Hi Shawn

Yes we have looked at that closely and at the wavelengths involved it is not an issue and would show up as a small glitch in the measured curve. Also remember you are listening to the total radiated 'sound power' when you listen to a speaker in a room not a specific direct frequency.

James

MarvinTheMartian

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Re: THE MAKING OF A BRYSTON MODEL T SPEAKER
« Reply #21 on: 1 Jul 2015, 01:27 pm »
James ... I guess I owe you a days pay! You seem to have all your bases covered.
Thank God today's a Canada Day holiday and I am enjoying the day off : )
Just my 2 cents then ... Shawn Gid'Day

James Tanner

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Re: THE MAKING OF A BRYSTON MODEL T SPEAKER
« Reply #22 on: 1 Jul 2015, 01:34 pm »
James ... I guess I owe you a days pay! You seem to have all your bases covered.
Thank God today's a Canada Day holiday and I am enjoying the day off : )
Just my 2 cents then ... Shawn Gid'Day

Yes we really have looked at as many of the issues we feel are relevant to listening to speakers in real rooms.  If you have not had a chance to watch the Floyd Toole seminar I posted have a look as it really does have a lot of great information - under Speaker Design.

You have a day off so there's no excuse not to watch it. :lol:.

james

MarvinTheMartian

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Re: THE MAKING OF A BRYSTON MODEL T SPEAKER
« Reply #23 on: 18 Jul 2015, 11:18 pm »
James:
I watched the F. Toole lecture , too bad it only lasted an hour, he was just getting warmed up. : )
I also follow these other characters, in no particular order , S. Olive, E. Geddes, A. jones, P. Barton etc.

It was the "Home Theater Geeks 263" interview with Andrew Jones that prompted my tweeter query.
Andrew found a problem in his prototype tweeter and corrected it his latest production ELAC speakers.
He noticed his prototype had a 3db dip in the measured response at 15KHz.
 
Very similar to the latest NRC measurements of your  Mini A's.
http://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1406:nrc-measurements-bryston-mini-a-loudspeakers&catid=77:loudspeaker-measurements&Itemid=153

Andrews fix was to remove all irregularities around the dome ... Shawn

James Tanner

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Re: THE MAKING OF A BRYSTON MODEL T SPEAKER
« Reply #24 on: 19 Jul 2015, 12:01 am »
James:
I watched the F. Toole lecture , too bad it only lasted an hour, he was just getting warmed up. : )
I also follow these other characters, in no particular order , S. Olive, E. Geddes, A. jones, P. Barton etc.

It was the "Home Theater Geeks 263" interview with Andrew Jones that prompted my tweeter query.
Andrew found a problem in his prototype tweeter and corrected it his latest production ELAC speakers.
He noticed his prototype had a 3db dip in the measured response at 15KHz.
 
Very similar to the latest NRC measurements of your  Mini A's.
http://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1406:nrc-measurements-bryston-mini-a-loudspeakers&catid=77:loudspeaker-measurements&Itemid=153

Andrews fix was to remove all irregularities around the dome ... Shawn

Hi Shawn

Yes I was aware of that but as I have said before you are not listening to that measurement as it is one point in space with a microphone. You are listening to the Sound Power and that small deviation is irrelevant. Thats not to say you do not try to improve things.  We have been using a new tweeter now for a while in the T Series and it does reduce some of the effects that were measured in the older tweeter




james


« Last Edit: 19 Jul 2015, 10:56 am by James Tanner »