sansui

All the highs and mids in both my sansui sp-x7's stopped working instantly while listening to them at high volume. All the while there was no distortion from either of them. I have seen no fuses inside or out. Any suggestions?

recently acquired a pair of sansui sp x7 speakers in excellent condition. I'm driving them with a nad 3140 preamp and nad 2140 amp in bridged mode with a denon avr-95 receiver's preouts. Geuss my question is can these take this kind of power without destroying the speakers? Seem to sound good...