AlexSauter wrote:Hello Nicco,
I have a few questions, and hopefully I can give you answers!
1) Do you have pets?
2) is the foam on the front of the ribbon starting to crumble?
3) Has anyone other than yourself owned / tinkered with your AL3+'s?
1) if you have pets, dander & fur can get down into the bottom of the ribbon and as the ribbon is driven and heats up, it can cause a "burning". For this, take out the SQUARE HEAD wood screws and remove the ribbon driver, pull on the wires gently to pull a little extra wire out of the box & lay it down on a pair of chairs. Take a can of air & blow a very light jet of air down into the last pair of slots in the ribbon driver, this should remove any dander, dust & fur.
2) same steps as one
3) if someone else has owned or tinkered with your AL3+'s there is a chance that the circuit boards are crossing the traces and making a short in the speakers. Also, unless you cut the wires from the ribbon to the crossover, you will not get an accurate reading from the ribbon, you will still be measuring the ribbon and the crossover.
Hope all this helps,
CarverAUDIO Ribbon Repair
I'm sorry for the late reply and thanks for chiming in. I've just had the III's for two weeks now but I noticed the burnt smell on day one. I didn't notice this at the seller's living room and I don't know if he or the first owner was a smoker. The foams don't lay flat to the ribbon frame(they are bulging), look, and feel their age. Could it be possible that ribbons somehow produce enough heat over the years and cause the foams to produce this burnt smell which then gets radiated back to the ribbons because of close proximity? But then, why don't other owners notice and report this phenomenon? In the meantime, I sprayed the foams with Febreze and it really helped mask the smell. I haven't checked if this has in turn neutralized the smell on the ribbons themselves. It doesn't look like anyone has tinkered with the ribbons as the felt backing and screws look undisturbed.
As I mentioned earlier, I can't get any reading form the ribbon binding post on one speaker but could get a reading of 4.7 ohms on the woofer binding post. I tried the ribbon/wiring solder points on the bottom of the ribbon at the back panel and measured 2.3 ohms. I repeated this with the other speaker and got 2.3 ohms and 4.7 ohms on the ribbon and woofer posts, respectively.
As you mentioned, these readings are not accurate, with the drivers connected to the crossovers but shouldn't there be at least measurable impedance from the ribbon binding post? The speakers sound normal to me although I noticed once that my Sunfire 200x5 felt warmer than usual after about an hour of normal listening(not concert levels!) and stayed warm to the touch an hour after being turned off. Is it being over-driven by the III's? If there is a short somewhere in the ribbon, wouldn't it show from the sound? If I didn't notice the smell and didn't do any impedance testing, I wouldn't think anything wrong with them from the way they sound. But please bear in mind that this is my first experience with ribbons so I don't know exactly how they
are supposed to sound normally. I listen with a wait and see attitude and it's very uncomfortable.
That's about everything I can relate about my experience with my III Pluses and hopefully, nothing's seriously wrong with them.
My deepest gratitude to every one trying to help.