I have not heard the DQ-12's, only the DQ-20i's and the mirror-imaged DQ-10's, both of which I owned. And I wish I still had them! I have not heard any speaker at $1000 per pair (new) or even $1500 per pair (new) that I would prefer. I of course have not listened to all speakers available new between $1000 and $1500 per pair. Has anyone?!
However, Almarg's comment about "purchasing a restoration project" are an important consideration for anyone considering Dahlquist speakers. The good news is, there are companies (e.g., Regnar) that can take care of most needed Dahlquist restorations.
One other thing I would mention is that in my experience, the DQ-20i's and especially the mirror-imaged DQ-10's sounded better at moderate to louder levels and required significant quality amplification to sound their best (to my ears, anyway). They both sounded great with my Levinson 27.5 that I had at the time.
However, Almarg's comment about "purchasing a restoration project" are an important consideration for anyone considering Dahlquist speakers. The good news is, there are companies (e.g., Regnar) that can take care of most needed Dahlquist restorations.
One other thing I would mention is that in my experience, the DQ-20i's and especially the mirror-imaged DQ-10's sounded better at moderate to louder levels and required significant quality amplification to sound their best (to my ears, anyway). They both sounded great with my Levinson 27.5 that I had at the time.