Rogers LS3/5a question

I also have a question. I have these same speakers which are 15 ohm and use them on my theater. I am driving them with a Yamaha rxv367 surround AV system. I bought that to replace an old period Nakamichi which went south. Well, I've been using it for about a year and the sound quality is deteriorating markedly. It now requires I take them to really high output to get loud sound and even so, the speakers sound like there is less volume from one than the other. It almost sounds out of phase or something...

I have changed the wires around (rotating the tires as it were) and that is of no effect.

Anyone with insight on gradual diminution of sound output and quality with these? There is no damage to the speakers b/c I can get transient and fleeting great sound from either. I really feel the speakers are affecting the circuitry in some way I don't understand.

I also owned these speakers and had them in my office driven by NAD 3020, fun, and the midrange was excellent. Mostly played Jazz, small scale classical and folk. Fond memories.

Disregard my prior inquiry, I had wired the speakers wrong after moving stuff around and fixed the issue.

LS3/5a had greater continuous longevity in my systems than any other speaker so far. I ran a double LS3/5a system for over a decade (think a miniature version of TAS' double Advent system from the mid-70s) and later used them in in secondary systems of as alternate speakers in my main system, from 1976 to 2002. The 15 ohms load will make most solid state amplifiers sound smoother and more refined, albeit at roughly half their 8 ohms power (unless its a McIntosh autoformer output SS amp). And if the mismatch is with a tube amp with only 8 ohm taps, no harm will occur. The speaker is a great match for OTL tube amps, like Atmasphere or Transendent, today. I used my double LS3/5as for several years wired in series for 30 ohms driven by Futterman OTL monoblocks. Sensational.

The BBC monitor emulated the midrange beauty, tone and human voice realism of the original Quad electrostatic, in a dynamic speaker. It's inefficient and has limited power handline. You generally need 25w to wake them up, and getting much beyond 70w is risky unless you're careful to restrict volume below where you hear the B110 driver driven past its range on bass transients. The speaker was designed before the CD, so dynamic range in digital source bass can put the 4" driver past its limits. The speaker has a bass hump between roughly 80 - 100Hz, to give the listener an illusion of bass range that's greater than the speaker actually has, but it worked well as a tactic for making a very small speaker satisfying. Actual lower limit bass response trails off rapidly below 70 Hz. With the right amplication, LS3/5a can still produce beautiful sound, within its dynamic limits, 40 years after its original development for BBC field monitoring.

Phil

hi i am new and first time on the forum, reason was i just bought a roger ls 3/5a and want to research a bit whether i really got the real stuff or a copy as i have no intention of opening the box as i am in experience and might destroy them!