Kimber 12tc incompatibility with ayre my-r twenty

Cardas recommended clear reflection internal biwired configuration 30 ft as an ideal capacitance load for the amp and tonal balance match for the blade 2 speaker.... looking for more advice

Electrical parameters aren’t specified for Clear Reflection at the Cardas site, but what leads me to question that recommendation is that generally speaking I would expect a biwired cable to present approximately twice as much capacitance to the amplifier as a similar non-biwired cable. And possibly somewhat more than that in the case of an internal biwire, depending on its construction.

Although in looking at pricing for the cable at The Cable Company site it appears that while a 30 foot length of that cable will cost around $8K for a stereo pair, specifying "biwire" appears to add only $200 to the price, and that is regardless of length. Which leaves me puzzled as to what the difference is between the biwired and non-biwired versions of that cable. Or would the approximately $8K + $200 be multiplied by 2 for a stereo pair of biwired cables, bringing the total to around $16K? That doesn’t seem "clear," pun intended :-)

Regards,
-- Al

I would definitely recommend NOT choosing Cardas Cygnus. While electrical parameters don't appear to be provided for it at the Cardas website, its design is stated to be "based on our flagship Clear & Clear Beyond conductors." Those cables, in turn, have capacitances that are much higher than the 494 pf/meter capacitance of the Kimber 12TC which apparently caused your amp to have the problem.

In your post just above, btw, "high inductance" should have been "high capacitance." As in the case of Goertz cables that were mentioned by Jtcf earlier, high capacitance has been known to cause some solid state amps to oscillate at RF frequencies, even resulting in damage in some cases. And the 30 foot length of your Kimber 12TC brings its total capacitance to an amount that is comparable to the capacitances of Goertz cables at more typical lengths.

I have no experience with Ayre equipment, or with the Blade or other KEF speakers, so all I can suggest is that you research the Virtual Systems section here and see what others are using with those products. And given the 30 foot length I would suggest ruling out any cable having a capacitance of more than say 50 pf/foot, which is about 1/3 of the capacitance of the Kimber.

And if the capacitance of a cable you are considering is not specified, I would contact the manufacturer and ask.  And if the manufacturer can't or won't provide that information I would look elsewhere.

Good luck. Regards,

-- Al
 

It's possible that the amp was not happy with the rather high capacitance of Kimber 12tc (494 pf/meter), especially if the cable is particularly long.

Presumably the high capacitance of that cable is a consequence of its low inductance (0.09 uH/meter) having been given a higher priority in its design.  But IMO inductance that low is overkill in most applications, and with solid state amps I would avoid cables having such high capacitance per unit length, especially if the length is relatively long.

Regards,

-- Al