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Best Isobarik and Transmission line designs?

Looking at the blurb on teh Bose site (here) the Wave Radio looks to have 2 speakers and it says they have 26" 'waveguides'. The picture looks more like a Daline with a rear enclosure and a TL running off that. It is a TL derivative. A 26" line would be a 130Hz tuning which might be lowered a bit with tuning or tapering the line. Hard to tell that stuff from the little picture on their site (on purpose I would imagine).

Ray
 
After further research, I'd like to correct myself...I don't think the Rega Jura is a TL design (though the Ela is, as well as others). It does, however, have a great bass feel and response that I prefer to the Timeframes.
 
My daily drivers, Lentek Monitors:

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I'm getting confused. Did Kef make a transmission line, or are people describing lines useing Kef drivers? My strong impression was that Kef never made them, and I can't see any suggestion that they did one their website, but maybe I'm in error.
And I may be wrong, but I'm guessing that the Decware speakers do not have a passive radiator at the end of a transmission line, and that instead what they mean by passive is that there is no enclosed airused as a spring or to resonate. My understanding is that for a passive radiator to work well, it needs to be pretty tightly coupled to the bass driver -- running the back wave down a tapered pipe would delay the radiator response, and the tapering would both lower the pressure and spread out the frequencies, neither of which would be helpful.
 
Rega, both past and present (R7's and R9's) are very good with the transimission line design. Someone mentioned PMC...they are fantastic speakers.
 
Nat said:
I'm getting confused. Did Kef make a transmission line, or are people describing lines useing Kef drivers? My strong impression was that Kef never made them, and I can't see any suggestion that they did one their website, but maybe I'm in error.
And I may be wrong, but I'm guessing that the Decware speakers do not have a passive radiator at the end of a transmission line, and that instead what they mean by passive is that there is no enclosed airused as a spring or to resonate. My understanding is that for a passive radiator to work well, it needs to be pretty tightly coupled to the bass driver -- running the back wave down a tapered pipe would delay the radiator response, and the tapering would both lower the pressure and spread out the frequencies, neither of which would be helpful.
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I think you are right. I've never seen KEF make a TL speaker although the B139 seems to be the No.1 preference in TL designs of that era.

Absolon, interesting speakers. B139, B110, T27 and what's that dome mid(?) over there?
 
Nat said:
I'm getting confused. Did Kef make a transmission line, or are people describing lines useing Kef drivers? My strong impression was that Kef never made them, and I can't see any suggestion that they did one their website, but maybe I'm in error....
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Sorry for any confusion. Looking for speaker companies that made either-

1) A nice transmission line design, or

2) A nice isobarik design.

I'm not familiar either, with anyone building an isobarik/transmission line design or KEF ever building a transmission line speaker.

So, to re-iterate... just interested in transmission line speakers of high quality, or isobarik speakers of high quality, but not a combo hybrid of the two.

absolon said:
My daily drivers, Lentek Monitors:

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Nice- they look very much like IMFs. Are they built by IMF by chance?

Art K. said:
Rega, both past and present (R7's and R9's) are very good with the transimission line design. Someone mentioned PMC...they are fantastic speakers.
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I know nothing of the PMCs but would like to hear the Regas.:thmbsp:
 
Sasi, that's a Celestion HF2000 supertweeter.


tdh, they have a similar appearance to the IMFs but a different configuration and were designed by Bert Webb and built by Lentek in England in early seventies. Line is formed by vertical baffles in cross shaped orientation to give a nine foot line. So far, about 13 pairs have been confirmed still in existence and highest serial number so far was under 400. They ran about 600 English pounds and I understand sold in the US for about $3000.

They are pretty nice indeed, doubt they will be leaving anytime soon:D
 
Holst,
I'm fairly sure the Whispers wouldn't be considered an isobaric speaker because the air between the woofers is not coupled. It's a quasi-isobaric set up, but even more unusual is the use of such a system with a Dipole bass configuration. It's certainly an unusual combination. :)
 
jimfet said:
http://www.decware.com/zreview126.htm

I'm running a set of these and they have very good bass. It's T/L loading a down firing passive radiator. I have a set of Fritz FE167E full rangers on top. That ribbon adds just the sparkle the full rangers need.
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Interesting design, there, as well. Maybe not a traditional TL (transmission line) but definitely a variant of the theme. I have played around with 2 TQWTs that used PRs instead of ports and I was fairly happy with the results. Makes it harder to identify as a particular type of enclosure, if nothing else.
 
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