Keep in mind that the preamp you choose should have low output impedance, and the cabling you choose should have low capacitance (such as the Blue Jeans cables Bob suggested).
Balanced connections do not negate the possibility that high output impedance in combination with high cable capacitance (which is proportional to length) will roll off the upper treble. At least some of the BAT preamps, and some of the Pass Labs preamps, have worrisomely high output impedances in that respect (e.g. 750 to 1000 ohms). The Ayre should be fine, as should the Benchmark for at least some of its output attenuator settings.
Regards,
-- Al
Balanced connections do not negate the possibility that high output impedance in combination with high cable capacitance (which is proportional to length) will roll off the upper treble. At least some of the BAT preamps, and some of the Pass Labs preamps, have worrisomely high output impedances in that respect (e.g. 750 to 1000 ohms). The Ayre should be fine, as should the Benchmark for at least some of its output attenuator settings.
Regards,
-- Al