Sub recommendations for electrostatic speakers


Does anyone have some advice or recommendations for a sub that would blend well with soundlab m2 electrostatic speakers?
rleff
My dad is buying the new Aesthetix Atlas amp which has been submitted to the makor rags for review, he owns Vandersteen speakers and I mention this amp because with input from Richard V the filters are built into this amp. Its a bit pricey but man this amp sounds awesome, easily besting much more expensive amps I have heard and respect.