Morgan Jones "Arpeggio" Loudspeaker - Page 6

chrisb · 24th February 2010, 09:43 PM

Quote:

Originally Posted by Colin

Hi Chris - Here's a video showing the original research paper and Alan Shaw, of Harbeth, guiding the reader through it.

Harbeth thin wall cabinets - BBC research

The paper is available on the web (without the director's commentary). there's also a thread about it on Harbeth's own site - BBC-style thin-wall cabinets. Why so special?

thanks, Colin

Quote:

Originally Posted by planet10

You are getting sleeepppyyy....

dave

with my propensity for math any more complicated than the square root of 1, this could be more efficacious than a pill or couple of shots of bourbon

certainly that was the case with the recent Toole text - I was lucky to keep my eyes open for more than 1/2 hr per session.

JimT · 24th February 2010, 11:08 PM

I spent years trying to figure out how to DIY speakers. Your article explained a lot very clearly. I just wish you had written this a few years ago, it would have saved me a lot of mistakes along the way. I had most of it down, but it was fuzzy, now it's not. One thing I had not figured out was how much delay a closed box roll off caused. You had that too.

I have some FE166E's in "storage". I'll make some of these.

PS: Is the felt a "wool felt", and how thick is it?

Thanks
Jim

EC8010 · 27th February 2010, 08:12 AM

Hello Jim,

it's about 1mm thick and according to the label from the John Lewis department store:

"70% viscose
30% wool
Do not wash, sponge or dry clean"

planet10 · 27th February 2010, 08:48 AM

Quote:

viscose

Becoming synonymous for rayon.

dave

HJ · 21st March 2010, 07:38 PM

A very good article Mr. Jones! Everything as very well explained as in your book on valve amplifiers.

I have a pair of Fostex Fe208 Sigma's and will make a pair of loudspeakers according to the same procedure as you described. Originally I used these in Jericho horns.

Besides that, I'm also working on an amplifier of Mr. Pass' design. (I'm stuck now at the chassis and the heat sinks) As mentioned in on of the earlier comments on the article, on the ESP-site adjusting the output impedance of an amplifier is explained. If I understand well, an Aleph type amplifier is easily adjusted to a certain output impedance by changing the feedback loop?

HJ

27th February 2010, 08:12 AM	#53
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Hello Jim, it's about 1mm thick and according to the label from the John Lewis department store: "70% viscose 30% wool Do not wash, sponge or dry clean" __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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24th February 2010, 11:08 PM	#52
JimT diyAudio Member Join Date: Oct 2004 Location: Waterloo	I spent years trying to figure out how to DIY speakers. Your article explained a lot very clearly. I just wish you had written this a few years ago, it would have saved me a lot of mistakes along the way. I had most of it down, but it was fuzzy, now it's not. One thing I had not figured out was how much delay a closed box roll off caused. You had that too. I have some FE166E's in "storage". I'll make some of these. PS: Is the felt a "wool felt", and how thick is it? Thanks Jim

21st March 2010, 07:38 PM	#55
HJ diyAudio Member Join Date: Mar 2006 Location: Alkmaar	A very good article Mr. Jones! Everything as very well explained as in your book on valve amplifiers. I have a pair of Fostex Fe208 Sigma's and will make a pair of loudspeakers according to the same procedure as you described. Originally I used these in Jericho horns. Besides that, I'm also working on an amplifier of Mr. Pass' design. (I'm stuck now at the chassis and the heat sinks) As mentioned in on of the earlier comments on the article, on the ESP-site adjusting the output impedance of an amplifier is explained. If I understand well, an Aleph type amplifier is easily adjusted to a certain output impedance by changing the feedback loop? HJ

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