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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.?

Fifteen years ago, Dahlquist did not exist. Only Dahlquist Holdings up in Canada owned by Audiosphere Technologies, which was Dahlquist in name only, and Regnar were around then to use the name. Though the first did build a tribute model to the DQ-10, the DQ Ten, I'm not aware of them offering support for the older models. Nor am I aware of Regnar using the old polyester caps as the fellow behind that prefers Solens and, more recently, ClarityCap. Certainly an interesting mystery.

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As for those coming from the factory like that, if I'm remembering correctly, only the first batch of units from Dahlquist are said to have used actual circuit boards for their crossovers (under 200, certainly, maybe fewer) before switching to the waxed masonite backer. Though, I've not been able to confirm that and haven't added it to our wiki for that reason. Be interesting to see if yours are very early examples (orange dust cap on the Philips AD5060, two piece brackets, CTS woofer, different crossover setup) for that. Though, the crossover boards would definitely be looking their age and of the yellow phenolic variety.

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As for the tweeter, I can't make any suggestions to that other than the Mikrofonbau?HTL-1913 is one of the big weak points of the DQ-10 and could use upgrading if you can do it without messing up the crossover magic too much. Just don't remove ferrofluid from any driver that has it. That's a misguided hack by people who don't understand driver design and will never improve the driver. What it will do is diminish damping making it much harsher (some inaccurately find edgier treble to be "more detailed" despite it being more distorted and unbalanced) and flush the power handling down the sewer.

It is a bit of a mystery. The the mids don't have orange dust caps so I am assuming they are a later version. I'll check the woofers later, I don't think they are CTS, but I have to go in and replace the tweeter potentiometers so I'll see. Someone also "upgraded" the wiring to what looks like 12 gauge monster cable.?
Thanks for your helpful info on the tweeter. The original tweeter didn't have ferrofluid so I can understand why folks might think that removing it from the substitute would be worthwhile--but I get how that might be misguided assuming the replacement, while cosmetically very similar, might actually be pretty different. I'lll probably get a pair and play with them anyway just to get my own opinion. One of the existing tweeters is open even though I don't see where the issue is. The D2010 substitute sounded really nice in my previous pair--but maybe almost too nice if that is a thing??

It is a Dahlquist board for sure. But these are the advent masonite ring woofers so not a super early model. But also not originally mirrored. Seems like if the board was an upgrade that that would kind of weird but maybe whoever did the work had some of these around and could just swap them in? Oh well, might remain a mystery. All I know is that it sounds great though I'm going to continue to experiment with various tweeter replacements.