The Thiel 3.6 bass goes pretty deep, but it is very well-controlled, such that you may feel it comes across somewhat lean, especially after the Vandy 2CEs. The mids and highs are good given that used speakers have been broken in. The highs are not as sharp/harsh as some of Thiel's subsequent designs.
Remember also, the 3.6 has earned a reputation as a difficult load, with impedance dipping to below 3 ohms at certain frequencies. Your Moscode 600 is known to be capable with difficult loads (one powered a vacuum cleaner at a CES?), so this should not be a problem.
Remember also, the 3.6 has earned a reputation as a difficult load, with impedance dipping to below 3 ohms at certain frequencies. Your Moscode 600 is known to be capable with difficult loads (one powered a vacuum cleaner at a CES?), so this should not be a problem.