KEF 107.2 with KUBE?

Hi I owned these speakers a few years ago. They sound fine without the Kube but are definitely more accurate with the KUBE. Unfortunately each Kube is adjusted for the particular drivers and individual speaker - left and right. In other words each Kube is specific to each actual box. Variations in the actual drivers installed are adjusted for in the Kube. Therefore you cannot mix Kubes and speakers or buy another Kube. So in summary without Kube is ok but you should discount the value or price heavily as the speakers are not complete and the Kube cannot be replaced.

I've read that the design of the KUBEs is specific to models of speakers. The installation instructions for the KEF 107.2 warns that a 107.2 KUBE should be used with 107.2 speakers, but does not mention that KUBEs are adjusted for individual speakers. If that were true, a KUBE would need to be readjusted any time a driver is replaced, reconed, or received new surrounds. The 107.2s I'm buying are said to have had the cones and surrounds replaced recently -- before the seller became enamored with ultra-low wattage amps that require even more efficient speakers.

db

Hi db

Contacting members is no longer an option since the Audiogon upgrade took place. I saw 2 active listings for KEF 107.2 speakers. You can ask those sellers questions about the 107/2 and the Kube equalizer.

I never saw KEF say their KUBE Equalizers were adjusted for individual speakers I only saw different KUBE EQs for various speaker models. 105/3, 104/2, 103/3 etc etc. Have you tried contacting KEF about the 107/2 and the Kube EQ for it? I've spoken to Corey Medley over at KEF customer service (GP Acoustics (US) Ltd) a couple of times regarding various KEF speakers I've owned or had questions about and they were responsive.

Also I don't see how the KEF Kube EQs would need to be re-calibrated if a re-foam or surround repair was done. Wouldn't that kind of repair return the speakers to original form so no change to the eq is warranted? I would think if you changed the original drivers to an entirely different speaker you would have to modify the Kube.

Well good luck in your search.

J24,

Recalibrating KUBEs when a driver is altered would be necessary only if KUBEs were calibrated for individual speakers, something neither of us thinks is likely.

db

KUBE -
I AM ABSOLUTELY CORRECT WHEN I SAY THAT EACH KUBE IS CALIBRATED TO THE INDIVIDUAL SPEAKER.
If you can find Dick Olshers review in Stereophile vol 9 no 7, November 1986, he discusses the 107 Kube. He actually had DC offset problems with his 107's Kube.
When contacting the factory Dick was advised that the factory had all the Kube parameters recorded for his specific speakers, which were serial number SN1407, and the factory would be able to build a new Kube for those specific speakers. Each speaker is also marked L for Left and R for Right. This is all documented in the review.
I can only suggest if you still dont believe me, or Dick Olsher, then contact the factory direct and hope that someone there has been there long enough to remember.