G.A. briggs-loudspeakers book

mikee12345 · 30th March 2003, 08:47 AM

does anyone have a copy of this?

it mentions something about drivers having different resonances causes the response to be boosted or somthing like that...
i think particurly for open back speakers.

its an old book we have the newer one on ported boxes.

Pjotr · 30th March 2003, 09:29 AM

Hi,

What I have here is G.A. Briggs “Luidsprekers”

It is a book from the early ’50-ties indeed. Bought second hand mainly because it is loaded with speaker ads from those days. Who remembers “Geloso” and ”Grampian Reproducers Ltd.” or the “Stentorian” concentric duplex speaker?

Unfortunately for you it is a Dutch translation. It is a good introduction to loudspeakers but no in depth information in it.

Cheers

Brett · 30th March 2003, 11:08 AM

I have a copy, but I'm not sure exactly what you're looking for in it.

mikee12345 · 30th March 2003, 09:08 PM

im just interested in the mutual loading part
(its actualy my dad who wants to know)

>>it mentions something about drivers having different resonance Drivers.. causes the response to be boosted or somthing like that...
i think particurly for open back speakers.
he said he heard some open back speakers ages ago that had different resonance drivesr and was surprised by the bass.
perhaps i should search for some IBs in yahoo.

anything like that?
if not no matter

Circlotron · 31st March 2003, 03:01 AM

Things Gilbert Briggs wrote about loudspeakers should be read with one eye on the modern understanding of speakers too. He was a very smart man in his day, but on the foundation he laid much has been learned since. My favourite statement of his is goes something like "Loudspeakers are like cabbages- the bigger the better, but too big and they go to seed".

Nowadays we have precise mathematical formulas for such things.

Brett · 31st March 2003, 04:20 AM

Quote:

Originally posted by mikee12345
im just interested in the mutual loading part
(its actualy my dad who wants to know)

>>it mentions something about drivers having different resonance Drivers.. causes the response to be boosted or somthing like that...
i think particurly for open back speakers.
he said he heard some open back speakers ages ago that had different resonance drivesr and was surprised by the bass.
perhaps i should search for some IBs in yahoo.

anything like that?
if not no matter

I'll have a read later tonight, but I don't recall anything like that.

However, this might give you some ideas.
http://www.fortunecity.com/rivendell...d/dddllqd.html

johngale · 2nd February 2004, 12:44 AM

Hi Mikee 12345,
I have Briggs' 'Loudspeakers' in its 5th edition. As you might know, he favoured open baffles and bass units in parallel in close proximity, and had this to say on p182 (the end of the Chapter on baffles):
"... two speakers with identical resonance frequency could be used, provided the frequency is low. The parallel working and close coupling bring down the impedance peak both electrically and acoustically."
On p179 (talking about two closely mounted units) he had noted:
"...the effective radiation resistance of the combination is greater than the sum of the individual radiation resistance by virtue of the mutual coupling..." ie. improved bass response.
I hope this helps with your enquiry.

30th March 2003, 08:47 AM	#1
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	G.A. briggs-loudspeakers book does anyone have a copy of this? it mentions something about drivers having different resonances causes the response to be boosted or somthing like that... i think particurly for open back speakers. its an old book we have the newer one on ported boxes.

31st March 2003, 03:01 AM	#5
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Quotable quote. Things Gilbert Briggs wrote about loudspeakers should be read with one eye on the modern understanding of speakers too. He was a very smart man in his day, but on the foundation he laid much has been learned since. My favourite statement of his is goes something like "Loudspeakers are like cabbages- the bigger the better, but too big and they go to seed". Nowadays we have precise mathematical formulas for such things. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

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30th March 2003, 09:29 AM	#2
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi, What I have here is G.A. Briggs “Luidsprekers” It is a book from the early ’50-ties indeed. Bought second hand mainly because it is loaded with speaker ads from those days. Who remembers “Geloso” and ”Grampian Reproducers Ltd.” or the “Stentorian” concentric duplex speaker? Unfortunately for you it is a Dutch translation. It is a good introduction to loudspeakers but no in depth information in it. Cheers

30th March 2003, 11:08 AM	#3
Brett diyAudio Member Join Date: Jan 2002	I have a copy, but I'm not sure exactly what you're looking for in it.

30th March 2003, 09:08 PM	#4
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	im just interested in the mutual loading part (its actualy my dad who wants to know) >>it mentions something about drivers having different resonance Drivers.. causes the response to be boosted or somthing like that... i think particurly for open back speakers. he said he heard some open back speakers ages ago that had different resonance drivesr and was surprised by the bass. perhaps i should search for some IBs in yahoo. anything like that? if not no matter

2nd February 2004, 12:44 AM	#7
johngale diyAudio Member Join Date: Feb 2004 Location: Sydney, Australia	Hi Mikee 12345, I have Briggs' 'Loudspeakers' in its 5th edition. As you might know, he favoured open baffles and bass units in parallel in close proximity, and had this to say on p182 (the end of the Chapter on baffles): "... two speakers with identical resonance frequency could be used, provided the frequency is low. The parallel working and close coupling bring down the impedance peak both electrically and acoustically." On p179 (talking about two closely mounted units) he had noted: "...the effective radiation resistance of the combination is greater than the sum of the individual radiation resistance by virtue of the mutual coupling..." ie. improved bass response. I hope this helps with your enquiry.

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