Dear Sirs, I would like to purchase/assemble a high quality portable electrostatic set. What is the STAX SRS-002 like ? Saw this is portable but do not really fancy in-ear. I would really like to use the STAX SR-L700 ...or at least the L300...but with what STAX portable amplifier could I use it ? Is the STAX SRM-353x Driver Unit portable ? I have even looked into the KingSound KS-04 and M-03 - Any good ? Could this combo work; STAX SR-L700 and KS M-03 ? Or better in that case stick to the KingSound assembly ? Could the music source in these cases be TIDAL coming from an IPHONE -7 ? Can the IPHONE-7 be connected to these amplifiers ? Thank you very much for your help !