Yours are a very early set, the second or third oldest pair in the group that I'm aware of, so that's very cool. Your pair will have been built the summer of 1973. For the timeline, we've a group wiki on the left that has what information could be sourced and verified.
Timeline:?/g/DahlquistSpeakers/wiki/23985
Your revision:?/g/DahlquistSpeakers/wiki/23605
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As for the woofers, yours would have had the early 10" CTS stock, but they may have gone back to the dealership for upgrading to the new Advent style woofer when that came out. You'll need to check your woofers to see which they are. The surrounds for the Advent style are the most commonly recommended for DQ-10s, but most likely won't fit the CTS woofer. In which case, the woofers will have to be measured to get the right set ordered for them. (Not difficult when working with an outfit like Simply Speakers, but it is one more step to be aware of.) If yours are the CTS, any pictures you can get of the back would be much appreciated. The wiki is lacking in that as only photos of the front of the drivers have been available thus far. I've been trying to figure out what the specific driver model (numbers printed on the magnet) may have been.
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- John
