As mentioned in another post, I recently acquired another pair of DQ10. The serial numbers are missing, they are not factory mirrored and weirdly the crossover boards are actual, nicely built circuit boards but with the usual yellow caps and 80uf electrolytic. The previous owner claims to have sent the speakers back to Dahlquist maybe 15 years ago for service but is this part of an upgrade or were there some that came from the factory like this? I haven't seen it before and have seen no images of this online.
Also--just curious about other people's experience with tweeter replacement-upgrades, etc. I am currently experimenting with Dayton AMT drivers. Kind of beautiful in their own way, spacious, but not really quite right even when padded down where they need to be. I have previously used the scan speak D2010 and thought those were awesome but a little pricey. Is it true that the Visaton that looks like the original actually sounds better than the original once ferrofluid is removed? Just curious, I will probably order them and try them but just wonder if others have any opinions about them.?