agdrago
A capable amp's power specs should read something like:
- 100W @ 8 ohms, 0.1% distortion or less 20Hz - 20kHz, both channels driven
- 200W @ 4 ohms, 0.1% distortion or less 20Hz - 20kHz, both channels driven
- 400W @ 2 ohms, 0.1% distortion or less 20Hz - 20kHz, both channels driven
- Stable at 1 ohm
Amps whose specs diverge much from the above template may sound just fine, or even fantastic, paired with high-efficiency speakers.
But amps that will convincingly, authoritatively drive large, low-efficiency floorstanders with unforgiving impedance curves ought to be able to deliver 150A current peaks, not 15A.