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In Reply to: RE: The RIIIs, I have mentioned in print, were one of the most memorable auditions I ever had. nt posted by John Marks on May 24, 2015 at 17:40:26
Not sure but I think the RIII was avery different speaker from the R and RII. The 1st 2 version were basically a KEF Concerto kit(B139, B110, T27) in a line tunnel(basically the same loading as the Dynaco A25 stuffed port). The R used a modified Concerto crossover. The RII used a new crossover custom designed by KEF for Bud Fried with a lower woofer crossover(200 Hz rather than 375 Hz). The RII was a significant improvement over the original version.Interestingly the original version of the speaker that became the IMF Monitor was also a KEF Concerto kit but placed in a transmission line box and designed by John Wright.
Edits: 05/24/15Follow Ups:
yes hahax, you are correct, the RIIs and IIIs are different animals. the II had all KEF drivers, the IIIs had none i believe. the cabinet was also a bit larger. the demo i attended was poorly conducted apparently because i didn't like them at all. i never saw them on demo ever again.
the 'line tunnel' load never had the extended bass capability as a real transmission line. not that i don't love the sound of the RIIs, they just don't reach the lows, hence my use of the H sub that i got from my friend (who had the monitor IIIs improved, and the fried pro monitor IVs).
the model H sub/sat system was incredible. then fried changed the drivers and screwed it all up. admittedly, it wasn't his fault as KEF was no longer supplying the drive units.
...regards...tr
But I suspect the line tunnel bass was tighter. The line tunnel is a variation of the stuffed port in the Dynaco A25 and also of the Variovent loading. It gives the same single resonance of a closed box when done correctly. The nice thing it does is lower the Q of the speaker and it reduces the impedance peak at resonance. It makes the bass tighter with reduced overhang.
i owned a25s for a long time and the bass WAS tight as it is in the RIIs. coupled with the fine imaging and overall transient response, these are great speakers that makes me wonder WHY didn't they sell much better.
...regards...tr
If you are speaking about the sales of the A25, it was a massive success with over 600,000 sold making it among the 2 best selling speakers of all time(not sure if the Advent didn't sell more).
The only commercial versions of the IMF monitor that I know of all used a Celestion tweeter and a Coles supertweeter. Only the woofer and mid were KEF.
You are correct but the 1st Monitor at a show used the T27. The T27 was replaced with a Celestion HF1300 tweeter and Celestion HF2000 as a super tweeter on the Monitors imported to the US. The Coles was used for simpler versions sold in Europe and also in the smaller, cheaper Studio version. The European only Monitors were about 2 inches shorter and used veneer rather than Formica finish used on the top version of the Monitor which was the only version Bud imported. But the 1st Monitor used a T27. Bud told me the story directly.
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