johnfalc Posted May 31, 2019 Report Share Posted May 31, 2019 I recently bought a beautiful set of AR-9s (you may have seen the post from "Goose" last week about their availability - this post was moved to the "For Sale" section). Goose (Michael) was the original owner of these (bought them as a Teledyne employee) and he mentioned to me that, about ten years ago, he'd had the woofers and lower midrange worked on (he thought just new surrounds). All the drivers work properly but I was suspicious that the LMR had been changed given the different cone material from the proper LMR set in my AR-90s. The new AR-9s sounded impressive but with a bit more "wooly" feeling in the lower range of vocals than I expected. I measured the output of all drivers with the XO set to 0 by all three switches and took measurements of pink noise with a calibrated mic just 1" ahead of each driver just for reference. The tweeter and UMR were both about 3-5 dB lower in output than the suspect LMRs when looking at an FFT display in each drivers covered range. So ... I pulled the proper drivers from my AR-90s and installed them in the AR-9s (and while doing so found that whoever had worked on the AR-9s had failed to install gaskets for the LMRs). The result: Taking the same measurements as characterized in the preceding paragraph, all drivers are now within very close to the same output levels in their respective ranges and the speakers sound noticeably clearer, especially on vocals with content in the lower range, like Odetta, or even Bob Seger, or Kate Wolf. So ... I'm in the market for a pair of 8" LMR to restore my AR-90s to "stock" but am also interested in first-hand experience using other 8" AR drivers as substitutes, especially ones that have the original formed-paper cones rather than the plastic (polyethylene?) cones on the 1210045-08 (maybe 0B - hard to see) that my new-to-me AR-9s came with. Thanks, John (who is still convinced he got a fair deal on some beautiful speakers he's wanted for a long time). Quote Link to comment Share on other sites More sharing options...
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