Patrick - no, dont connect line-out from any DAC to a preamp. You may accidently damage your speakers.
If you must use your current DAC, then get a transformer-based linestage to replace your preamp. Here are some choices at different pricepoints:
http://www.audiocircle.com/index.php?topic=89744.0
Steve N.
Empirical Audio
If you must use your current DAC, then get a transformer-based linestage to replace your preamp. Here are some choices at different pricepoints:
http://www.audiocircle.com/index.php?topic=89744.0
Steve N.
Empirical Audio