brianw Posted January 26, 2019 Report Share Posted January 26, 2019 I know its been talked about on this forum before, and I have red a lot of discussions on tweeters and replacement tweeters. But I decided after acquiring another set of AR 9's that have some failed and aged or weak drivers it was time to resurrect this subject as the spare parts do get harder to find and when you do find originals you often have the problems associated with age and what you actually get when buying such an old component. I recently found my second pair of AR 9's had a very veiled sound, after swapping tweeters from a pair of AR 91 speakers I discovered it was a tweeter problem probably related to ferro fluid that has either hardened or gotten gummy after 40 years, i am told. I am no Mr. sound engineer although I have been playing with sound since about the age of 12, ( now let's just say above 50 now), Have built a few speakers from scratch back around 22 using kef drivers, EV drivers, isophone etc., and just tinkered with crossovers. Have a electronics degree, ( but getting rusty), alng with a few other papers, built and sold several Technology companies except the last two that I currently own. So my passion I have finally had the time to play with, sound. The last pair of AR 9's have now had new Mundorf Aluminum oil Capacitors, upgraded wiring and some minor refinishing. NOW the big question and hoping to get some solid suggestions from those with more experience in audio. I have read some old post, 2005, newer and older as to substitute drivers. So I have found two of the obvious tweeter replacements. ABtech, Simply speakers and Midwest Speakers. ABtech http://www.abtechservices.com/index.html These guys were helpful and at least spoke to me. Also explained it was the same speaker that Simply Speakers sold. Simply Speakers https://www.simplyspeakers.com/acoustic-research-replacement-tweeter-12000840.html The fellow I spoke to at simply was essentially rude and emailed they only have the info that was on the site. I phoned and got the remark "well it is an old speaker and that's what they have, so take it or leave it. They implied I would not notice any sound difference as the old speaker was probably so bad this would improve" Midwest Speakers https://www.midwestspeakerrepair.com/shop/home-audio/mw-audio-mt-4121-75-inch-dome-tweeter/ The guys at Mid West and actually sent out a full spec sheet on their tweeter, something else no one else could seem to offer. And then the question crossed my mind why not upgrade, Dayton Audio, Scanspeak, Seas, they all offer some amazing dome tweets that have extended range to 25k or 40k and UMR units that are cleaner and smoother, and why not tinker with improving if at all possible. So now the question of trying to figure out how we can improve on a couple or three drivers and get even a cleaner natural sound. So I am looking to the pro's, hobbyist and the experienced for ideas, discussions and suggestions. And why not it's a hobby that I totally enjoy and enjoy the results of.. Brian MT-4121-4 New.doc Quote Link to comment Share on other sites More sharing options...
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