Speaker design

[James Tanner - Bryston]

MEMO: To All Bryston Customers
SUBJECT: Bryston Loudspeaker Designs

Floyd Toole on Speakers.

Hi folks,

Please see the link below. It is a talk by Floyd Toole regarding loudspeaker design – it is lengthy - about 1 hour and 13 minutes but has a wealth of information about how real speakers behave in real rooms.

I am dating myself here but I was involved back in the late 70’s and early 80’s when Floyd was working at the National Research Center in Ottawa and went thorough many of these listening tests myself.

The Bryston loudspeaker designs are heavily based on the design principles presented in this seminar.


Please pay special attention to these highlights:

1. You do not hear the ‘on axis’ frequency response when listening to a speaker in a room – you are listening to the ‘SOUND POWER’

2. Published specifications matter – see our brochure

3. Comb Filtering misunderstandings.

4. Importance of ‘Double Blind Testing’

5. Equalization is just ‘WRONG’

6. Importance of manufacturing consistency

7. Closing the loop between the recording side and the reproduction side

8. Importance of the testing and measuring facilities available

Click on link:

[ame]https://www.youtube.com/watch?v=zrpUDuUtxPM[/ame]

[James Tanner - Bryston]

Hi James,

THANK YOU for the Toole lecture. I loved it. I even clapped with the audience at the end of the talk.

It makes me wish I could sit down with him for an hour or so. Every audiophile should listen to it although I suspect many of them would then waste tons of time rationalizing where Floyd is all off base.

Allen Edelstein

[BuffaloBill]

The most important takeaways for me were the importance of neutrality, flat frequency response on-axis, lack of cabinet resonances, and bass quality, all strong attributes of PMC transmission line speakers.

[James Tanner - Bryston]

Originally Posted by BuffaloBill

The most important takeaways for me were the importance of neutrality, flat frequency response on-axis, lack of cabinet resonances, and bass quality, all strong attributes of PMC transmission line speakers.

Hi Bill

The on axis is very important but the main point was that the 'OFF AXiS' response 'Listening Window' and total 'SOUND POWER' is more important that an 'on axis' flat response.

Many speakers look good directly on axis but have serious issues with smooth off axis response and not many companies supply these measurements for you to see.

I have not figured out how to post pictures but I have sent some example graphs from the Model T's to Ivan and will let him post them if he thinks it will help.

james

[SHV]

"I have not figured out how to post pictures"
*****
That's odd that a "Sponsor" doesn't have "Go Advanced, Manage Attachments" functionality.

Steve

[James Tanner - Bryston]

Originally Posted by SHV

"I have not figured out how to post pictures"
*****
That's odd that a "Sponsor" doesn't have "Go Advanced, Manage Attachments" functionality.

Steve

Hi Steve

I probably do its just I am to dense to figure it out.

james

[piolaxo]

This was a brilliant talk. Thanks for sharing!