Can you also remove, clean, and respray the protective perforated domes discolored by the old glue? Or it looks like too delicate an operation?
I have a suspicion that those perforated covers might be contributors to the raised last octave feature of the LS3/5A design. Only if measured while running on naked T-27s we would know if that's true.
What non corrosive glue do you suggest for their re-application? Falcon also sells replacements in case of need. LS3/5a T27 Grilles Pairs
Maybe, the ZIG dries if left in air, if anaerobic it is like the glue on a post-it.
Verysparse amount of some rubbery glur might work.
dave
Verysparse amount of some rubbery glur might work.
dave
Dave did you ever hear the Tangent RS-2 back in the day? That was another British model also with T-27 that I remember for midrange rightness and clarity. Although bigger in size it was managing this well. It had an eight inch bextrene cone Audax woofer.
Oh yes. We were one of, if not the largest, Tangent dealer in Canada. John Greenbank came visit us a number of times. I have a story about RS-4, Bryston 4B, a room full of acrid smoke from the square vent, quick repair, 15 min late rwe were in business
I had RS4 and RS8. The latter was near the end when they were stretching and was never fully baked.
A friend still has RS6. I redid his grills, the Rogers got the grills redone with Tygan with his old torn cloth.
I expect that if you find a set used, the value eof the parts far exceed what i have seen them sell for.
dave
I had RS4 and RS8. The latter was near the end when they were stretching and was never fully baked.
A friend still has RS6. I redid his grills, the Rogers got the grills redone with Tygan with his old torn cloth.
I expect that if you find a set used, the value eof the parts far exceed what i have seen them sell for.
dave
Some British speakers of that era had undersized resistors on crossover boards installed in touch with foam pads insulation. When abused they could even set the insulation on fire. The LS3/5a itself also had a hot resistor in some dodgy place. Belongs to an RC branch parallel to the tweeter.
That was what caused the smoke. We lost a woofer too. XO still worked after it cooled down.
dave
The BBC replaced their LS3/5 with Dynaudio Acoustics BM5 ported speakers.
Just sayin'...
Each type was optimized differently. They possibly avoided over excursion chances in the mini. The LS5/1 LS5/5 LS5/8 LS5/9 were ported.
Does anyone know the Q of the original sealed alignment? For such a famous speaker in which it factors highly it's surprisingly hard to find.
Indeed. Therein technically lies a story, because the original cabinets had screwed on front & back panels. The almost worshipped (ye gods) early prototype pair that's occasionally wheeled out for adulation and regarded by fans as perhaps the 'best' pair in existence was one of those. Er -two of those. You get the idea. It's interesting that the reproduction boxes when available, or complete speakers that have generally been liked the most, have also usually been of that construction. Slightly different structural resonance perhaps, but my money is that they had slightly higher losses, dropping Q a touch. IIRC fully sealed & damped, it's 1.1, but that will drop as Dave says to 1 or just below if there's a bit of unintended additional pressure-bleed going on.
I had two count ‘em! original 1970s Rogers LS3/5as, with and without Janis subwoofers, and yes they do sound better without grills on.
Thx! Wasn't thrilled with a test system running that Q, might be worth playing with bracing and thickness. If it works for the LS3/5A...