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LS-50 Speakers (Passive)

No matter where I and a friend reads, most people are raving about the Kef LS-50’s (passive version).   However, sadly, neither one of us have heard them with no local dealer.  The best would be to evaluate them in our respective rooms as the room accounts for about 1/3 of the sound.

Moreover, I recently heard that the new LS-50’s ((passive) are not the same as the originals as Kef tried to save some money.  Is there any truth to this rumor?  I certainly hope not so I thought I throw it out there and see the response I get.

Thanks for your input....
linnie01

Showing 1 response by ieales

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ieales
1,201 posts
 
I have a pair of UB5s, as well as a pair of ~1978 Chartwell LS3/5As. I should compare them some time.
40 year old caps are probably suspect

crossover to my sub naturally at the point where the mains can't no longer output, and keep the use of the sub to a minimum.
crossing over an octave above the main 'lower' frequency @ 6db / octave with a passive XOver and setting sub[s] to 18db / octave and 180° with the sub[s] in the main plane yields better results than trying to get bottom out of a small driver / box. The phase is correct, the mains are not stressed and less power is required for the mains. Main and sub should be same type, i.e. sealed or vented.

C = 1 / ( 2 * π * f * R ) where f is desired frequency, R is amplifier input in Ω.
C is in farads, so multiply by 10^12 FOR pF
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