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Old 8th April 2008, 01:13 PM   #11
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I can imagine how you feel Martin. However, in fairness to PMC, they are a relatively big & well-known company as far as specialist hifi speaker manufacturers go, & have been around a while. IIRC, they were started by ex BBC employees in the early 1990s & they've tended to stick with TL type cabinets throughout. Think a sort of TL version of Harbeth & you'd be about there -their speakers have generally been well recieved by the hifi press & studios alike, & they should have sufficient funding / profits to do a decent amount of their own research. I've certainly no evidence that they are directly using your sheets for commercial designs, but I have heard that they know of your (& George Augspurger's) work on the subject. It'd be surprising if they hadn't, so I suspect at the least, it'll have had some influence on them in recent years. Whether it's direct or indirect though is something I suspect we'll never know. FWIW, I reckon the latter is the more likely option in this case.
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Old 8th April 2008, 02:41 PM   #12
Colin is offline Colin  United Kingdom
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PMC also make great play of consistency between units (they don't pair match they 'all' match) so I would imagine they trial and error a new design by building it to get the balance right. As they sell into the broadcast and professional market, they can probably afford to do that. As Scott says, they have been around a while.
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Old 8th April 2008, 06:56 PM   #13
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Quote:
Originally posted by Scottmoose
Olney's 'Electronics' article appeared in April 1937
http://p10hifi.net/planet10/TLS/down...inth-Olney.pdf

Karma was on my side... i have run across only 1 early copy of Electronics and it was this one...

dave
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Old 8th April 2008, 08:13 PM   #14
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How lucky was that?

It makes an interesting read. Something that gives me a wry smile every time I see Olney's old AL write-up: whole lot more measurements in that than in Bailey's TL article some 28 years later.
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Old 9th April 2008, 02:49 AM   #15
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Quote:
Originally posted by MJK


That is now three commercial ventures that have come to light in the past couple of weeks using the worksheets under questionable circumstances. This is getting harder and harder to take. I must be a complete idiot to continue trusting people to do the right thing.
May I make a suggestion, as a software person? There is no shortcut -- you have to appoint someone to act as your representative, who will contact the intellectual property people at various speaker companies and offer them licensing.

This is a normal, everyday thing. It's just compliance vs. non-compliance. It's almost certainly not outright dishonesty so much as laziness and sloppiness. Legal departments (or lawyers on retainer) love to clean up those things -- that's how they justify their existence.

If they reject licensing, leave your options open without stating them. Just one programmer's opinion -- IANAL.

Edit -- by the way, I'm not saying you shouldn't be steamed! An organization stole my software while lying right to my face, and I literally could not sleep until I had shut them down. So I relate.
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Old 9th April 2008, 10:23 PM   #16
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PMC use a combination of Akabak and their own proprietary software for design. There was a tech background article on them in one of the UK trade comics a year or so ago.
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Old 9th April 2008, 11:05 PM   #17
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Nice thread to read guys.
Had a look at the link about the ATL system but they did not show a picture of the ALM1's incorporation...

We had it on loan and it truly is a great sounding monitor. Some people didn't like it because of the group delay on the bass but I thought it was really nice and full compared to some other units.
Any thoughts?
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Old 9th April 2008, 11:11 PM   #18
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Hi,

And special thanks for posting the original Olney article! I really like the way it's written. Considering it's age and being a scientific publication.

Regards Roland
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Old 10th April 2008, 09:23 AM   #19
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Hmmm.

Just looked up Arthur Bailey's acoustic transmission line Wireless World text.

No reference to B Olney, nor to Mr D Barlow's prior measurements given in a lecture at the then Brit.I.R.E on 24-01-62.

Appararently H J Leak and J Bolinbroke also examined 'line' characteristics but not known if published

Cheers .......... Graham.
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