I'm not familiar with the DQ-10, but the DQ-LP1 is specifically and solely for adding a subwoofer to any loudspeaker. Any x/o included as part of the loudspeaker itself is to provide filtering for it's integral drivers, not for adding a sub as is the DQ-LP1.
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If the caps of your DQ-10s are the originals and yellow, they are metalized Mylar and will still work well. There are numerous, more modern, film caps, that(if matched for values), will improve your sound quality, over these older Mylars. If the blue ones mentioned are original, they are aluminum electrolytics, now over thirty years old, and will need replacement, though the system will still(in all probability) function . Something that may(arguably) be the weakest point of the system’s design, is the Motorola piezo supertweeter, that Dahlquist used. I always replaced these with the ribbon, that JVC was manufacturing, back in the day. If you upgrade to a new ribbon, it will need it’s own high-pass filter/attenuator, as the old one was designed for the piezo, which(electrically) looks like a .15uF capacitor, in series with a 15 Ohm resistor. Ragnar, which is comprised of some of the old Dahlquist crew, offers upgrade kits, for the DQ-10: http://www.regnar.com/dahlquist-dq-10-upgrade-kits.html As mentioned: the DQ-LP1 was designed to integrate a powered subwoofer, in an actively bi-amped system, and has no other function. Some(currently available) ribbons: https://www.madisoundspeakerstore.com/ribbon-tweeters/