SpeakerTalk

[rackit]

I recently purchased a pair of KEF Concerto speakers SP1006. I have refinished the exterior and have installed a new pair of Falcom Acoustics cross-overs (33MC MK2).

Oddly enough, I noticed in disassembling the old SP1004 crossover the HF T27 tweeters were wired differently. On the right T27 the blue (I believe from schematics is the positive) was wired/soldered to the hf- while on the left speaker the blue wire was soldered to hf+. The T27's are not marked either positive or negative, at least as far as I can see. Which is correct? My gut tells to follow the schematic - blue to positive and somehow the original wiring was incorrect...but this seems unlikely.

Also, the T27 on the left speaker it is mounted so the connections to tweeter are at 3 o'clock and 9 o'clock while on the right speaker the tweeter is mounted at 11 and 4 o'clock. Would this make any difference?

Any feedback would be appreciated. Thanks.
John

[audiolabtower]

Kef custom on the T27 was blue is positive. From what I can remember the midrange was deliberately out of phase (black to positive) but the tweeter and bass in phase to suit the crossover design. Thus blue should go positive through a couple of (5uF??) caps. The rotation of the tweeter should not matter for sound quality but I would say that Kef will have built them horizontal (3 and 9 o'clock) so maybe one has been played around with and the wires crossed?

[rackit]

Thanks for your input. Your intuition is correct. The "cocked" tweeter and the blue being wired to negative are the same tweeter.

I will rotate and switch the tweeter polarity.

John