My 2 cents? I've owned Dartzeel (and really miss it). I currently own 40.1's, SF Strads, Conrad Johnson ART monos and ARTsa with a GAT.
You CJ preamp with the Dartzeel will be outstanding on the 40's. No doubt. Power with the Dartzeel should be enough to drive them to satisfactory levels. CJ ART or ARTsa will be also be amazing on the Harbeth.
Both the Lamm and Ayre will be a different kind of good. To my ear, Dartzeel and Conrad Johnson are amazing pieces. I have not tried the new current Ayre 20 series gear but like the non 20 gear enough to recommend you get an audition. A friend owned the mid level Ayre and it sounds really good.
Another amp I absolutely love on the Harbeth with my GAT preamp is a Hegel H30. The H30 is an outstanding performer.
You CJ preamp with the Dartzeel will be outstanding on the 40's. No doubt. Power with the Dartzeel should be enough to drive them to satisfactory levels. CJ ART or ARTsa will be also be amazing on the Harbeth.
Both the Lamm and Ayre will be a different kind of good. To my ear, Dartzeel and Conrad Johnson are amazing pieces. I have not tried the new current Ayre 20 series gear but like the non 20 gear enough to recommend you get an audition. A friend owned the mid level Ayre and it sounds really good.
Another amp I absolutely love on the Harbeth with my GAT preamp is a Hegel H30. The H30 is an outstanding performer.