I am using the SX-500 mono amps with Von Schweikert VR-4 JRs. The average impedance is 6 Ohms with 4 Ohms on the bass unit and 8 Ohms on the upper unit. The sensitivity is 89 dB. Your speakers are similar. These amps drive the VS very well. Plenty of volume. Clean articulate bass and very life like mid range and upper frequencies. As to the sound you like and the overall synergy, I can't say. But these amps will have no trouble driving your speakers.
