On Sep 29, 2011, at 11:13 , steve harley wrote: > on 2011-09-22 19:07 Joseph McAllister wrote >> The sub-woofer driver has destroyed it's surround. Only place that will fix >> it is in Florida, $100 in shipping away. > > there are several outfits that will sell you an inexpensive re-foaming kit, > as well as Youtube videos to teach you the process; for example (not a > recommendation of this specific service): > > <http://www.simplyspeakers.com/speaker-foam-repair-new-edge-it-kits.html> > > i haven't done it, but i have resold high-end speakers with deteriorating > surrounds on the basis that the buyer will do the re-foaming
Though that site has an 18" foam replacement kit, it won't fit a Velodyne driver. Velodyne told me the last time I called that they no longer carried nor sold 18" repair kits, or complete drivers, for that matter. The drivers are specific to my sub-woofers, in that they have an extra winding in the coil that is used to feed back to the 400 W amp to prevent run-away or over-driving from really hot and really low frequency signals. If I replace the driver with another, I can't use that amplifier without the circuit for feedback. The closest I can come is an 18" driver designed for stage sound. They cannot reproduce a true, clean 20 Hz sound like the Velodyne does. I can't hear it, but I could sure feel it sitting in my easy chair 10 years ago. Velodyne suggests I replace my 18" unit with two of their 15" units at a grand apiece to provide the same response down to 28 Hz. >> Oh tinnitus? Nothing can be done for it that would not further diminish my >> hearing capability. Just have to get used to it or die, whichever comes >> first. > > i've had tinnitus plus hearing loss in right ear since i woke up one morning > in 1974, hyperaudism (no damping) in left ear since 1990, and tinnitus in the > left for the last year or so; getting tinnitus so early perhaps made it > easier for me to tune it out; i really don't worry about it; music sounds > great > Music, or any sound louder than the tinnitus will drown it out. It's sitting here at the computer, or trying to enjoy a quiet day in the park that drives me to distraction. Reading a book as well. >> Just tested (online hearing test, always a bell-weather of accuracy) and see >> that my tinnitus is a harmonic centered around 6kHz. Has to be up to -27dB >> to hear it above my own din. Going up from there I can hear 8kHz down to >> -66dB, 12kHz down to (ha) -33dB, and 14-20kHz not at all. 1kHz is good down >> -81dB. > > [...] > > http://www.phys.unsw.edu.au/jw/hearing.html and blame the Aussies! > > interesting test; sounds like you used it as a threshold test, rather than an > equal loudness test at moderate levels (and by not using headphones you > introduced major aberrations); at moderate levels and with good headphones i > found my curve is pretty normal except my low frequency response is a bit > flatter (better) and above 6kHz my response curve just keeps going up > (couldn't hear 16kHz at all); individual ears would have very different > curves for me 75% of what I moved into this apartment with three years ago is still packed in boxes and totes stacked ceiling high in my family room. Somewhere in that pile reside my two pair of good head hugging headphones. I know not where. Two darkrooms worth of gear is there too. Any interested buyers willing to come by Everett Washington and help me dig it all out can have both, and a dozen enlarging lenses, for free! Seriously, I'm hoping members of two local camera clubs will want to collect this stuff, or at least help me dig it out. Problems with my shoulders and knees prevent me from doing the job. Joseph McAllister [email protected] -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
