A Linn Isobarik PMS clone for the 21st century?

[Inductor]

Originally Posted by SOUND_Rays

...and the orchestra has to play 5 times the same scores to achieve this.

Bama, bama!
Andrew, I like your savoir faire.

[SOUND_Rays]

@ Inuctor

"Bama, bama!"

Can't help If You don't know . . . . the past top technology . .

Yes, they manage in 3 days and each LP disk was cost from 250 to 300 German Marks in that time, only very small production run and only limited time, cost object perhaps?
just the best what money can buy. . . .

Regards

Andrew

[choralstuart]

Hello, I have just purchased a lovely black pair of Isobariks. I would love to be able to build my own and wondered if anyone had a drawing for them. Yes I have seen the "exploded" images, but need full dimensions. I should have tore apart the cheap pair I bought many years ago. I do have 4 pairs of B139s, 2 pair of B110s, and 2 pair of T27s (the replacement option for these speakers). I also have purchased a lovely :LK1 & LK2 (which was the origional pairing for the isobarik....by the way, I am happy to sell at least 1 pair of B139s
Thanks...Stuart

[Brett]

Originally Posted by choralstuart

I also have purchased a lovely :LK1 & LK2 (which was the origional pairing for the isobarik....

Hardly, back when I thought the earth was still flat, 1800's, mine had NAC42, NAP160's and I forget what the xover was called (NAXO?).

I'd also enlarge and extrapolate from the exploded drawings as none of the dimensions will be all that critical.

[choralstuart]

HI have you any drawings of these as I would like to build my own. I do own a lovely pair thanks Stuart

[Brett]

Originally Posted by choralstuart

HI have you any drawings of these as I would like to build my own. I do own a lovely pair thanks Stuart

As you already have a pair, 20 mins with a screw driver and tape measure will get enough dimensions to be able to work out the rest.

[choralstuart]

love to believe that, nut thanks. I have built many a transmission line speaker. As I look at the exploded images I have the mids are very isolated and looks like bass and tweeters seem to share the same free space....thanks

[Brett]

Originally Posted by choralstuart

love to believe that, nut thanks.

So you would blindly accept something posted on the net over your own measurements? I doubt you're going to get factory drawings.

Originally Posted by choralstuart

I have built many a transmission line speaker.

So what? It's not a TL. It's sealed in the rear which is very tolerant of slight differences. Something you'd know if you'd ever built a few.

A smaller front LF chamber, such as clam shelling the drivers would reduce distortion: hint, make it as small as you can.

Originally Posted by choralstuart

As I look at the exploded images I have the mids are very isolated

So find the T/S and model them in a good estimate of the sub enclosure volume, as well as 2x and 0.4x and I bet you'll find 2/10ths of F'all difference in the raw response, let alone the net with a xover in place.

Originally Posted by choralstuart

and looks like bass and tweeters seem to share the same free space....thanks

And the tweets are sealed in the back so it doesn't matter as they are effectively in their own enclosure.

There is nothing magic in what Linn did decades ago, and thinking that by to the mm slavishly copying it is going to produce identical sound is foolish. It's simply not that critical. Individual driver tolerances will readily swamp that.

[sreten]

Originally Posted by ingenieus

What I want to establish is .....

The main thing is the isobaric woofers.

That's the bit I'm really keen to try out.

Hi,

I wish people understood isobaric properly. Its nothing flash in the way
Linn did it in the Isobarik and the Sara, and is no better than properly
specified driver parameters for the sealed box volumes involved.

Subwoofers with heavy cones are the equivalent of two drivers
with lighter cones mounted in the same direction. Presumably
you should go for a 10" 4 ohm subwoofer with Qbox the same
as the Isobarik and Fbox the same or even lower if you can.

Its just sealed loading, done with two drivers at half impedance
to get box parameters for the box size you can't get with one
of the drivers. But for the box size you can go directly to
half impedance (4ohm) and your wanted parameters with
an intelligent single driver choice in the first place.

Going isobarik is equivalent to choosing a driver 3dB less efficient.

rgds, sreten.

[Turbon]

Nice slapping sreten...

So give your best shot instead and give the forum the chance of scrutinizing your choice.

Brgds