15-20 years... only maybe in your hands. I would blow them in a year...
If you're blowing capacitors that fast, there is something wrong with your amplifier or speaker connections. Not to mention, caps don't fail at the 15 year point, they just don't perform like they did when they were new. Perhaps you're just abusing your equipment. You seem to talk about blasting at full volume and huge excursions. Again, I'm glad you think vintage sucks because it would be a real shame to see you abuse a functional piece of art and history.
You don't buy new coils for speakers, that's not a wearable item unless the foam surrounds are installed improperly which would cause the cone to move in a slightly diagonal direction and make it rub the coil enough to remove the coating then you would get a short and blow your amp. Your speaker would be the least of your concerns then. The only wearable items on drivers are the foam surrounds and the spider. I have heard of magnets losing their power but NEVER in speakers. How did you measure the magnetic field and determine that it lost some of it's power?
All of your points are laughable.
I found a thread on a respected forum and went through a few pages and it helped me think of what I've been trying to articulate this whole time...
http://www.audiokarma.org/forums/showthread.php?t=436514Quality vintage equipment is fantastic. I don't have high end equipment, merely middle of the road stuff but guess what, it's worth less than $700 for my whole setup. It's fantastic sound and it's the best I've come across with listening to many receivers, speakers and DAC's. I have only $300 invested in my current setup and I've reached a point where I'm 100% happy. I don't feel like there's anything lacking. There's no sibilance or bloating, everything is crisp and the soundstage is fantastic, the sounds feel like they're surrounding me.
Compared to the stuff that's made today, it would take thousands of dollars to get the same quality. Not to mention, now that I've refurbished these speakers and don't abuse them, I should get 20 years out of them before I have to put any money back into them. $300-$500 receivers made these days die quite often within 5 years. I have an Onkyo receiver (yet another company that produced halfway decent stuff in Japan) that turns on and dies in 30 seconds. Even under warranty, they're not worth repairing. There is so much more value and soul in vintage electronics and even after you pay to get them repaired, they beat modern equilivants that are worth several times what you paid.
Contrary to what you believe, CPU processing doesn't help audio. The best anything can do is transfer the audio without altering it. No amount of software can re-add detail that was lost with MP3 compression. There is only 1 exception to processing and that's reclocking chips for digital signals to reduce jitter and make sure the digital signal is passed bit-perfect. But, it does not modify the analog signal itself, it just cleans the digital signal. The less components (capacitors, resistors, etc.) the analog signal has to go through, the better. It's fact.
But, even with all of this information, you'll still think you're right and all the avid vintage collectors in the world are wrong. I guess all those small 1-man shops that repair Marantz and McIntosh equipment are just there to steal your money while stores like Best Buy sell the best equipment there is. :
If you won't listen to me, do some reading;
http://forums.creative.com/showthread.php?t=575067http://www.head-fi.org/t/593050/the-nameless-guide-to-pc-gaming-audio-with-binaural-headphone-surround-soundhttp://www.head-fi.org/t/552257/calling-all-vintage-speaker-owners
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