Does and don't

You can but I wouldn't.   Most likely to just bottleneck the sound if not capable of delivering enough power and current.

@jea48 

Thank you for your explanation.   I fully agree with your analysis of TPP and its effects on current, circuits, and potential effect on dynamics of the reproduced sound. However, the specification cited was the Bryston specification for continuous maximum power, not transient peak power.  I calculate the specified CMP to draw 11.25Amps for a single unit.  This seems consistent with the Bryston manual that indicates a 15Amp mains supply is adequate; however, warns that on a shared circuit with other electronics or appliances, there is a potential to trip the breaker. I stated that under normal listening situations, maximum continuous power will probably not be reached, except in a high current demand situation (like a cold start up).  Again, I recommend contacting Furman for their recommendation.  Personally, I recommend a regenerator, regulator, or conditioner rated at 20Amps for this stated system and application.  I use a conditioner rated for 20Amps on a dedicated 20Amp line and my amplifier draws less current at MCP than the 4b. I hear no degradation in SQ, and benefit from lower noise and surge protection.  

Garth Powell (audioquest) designed some Furman units, I believe. Look for one that has words like transient power correction or similar. If it does, plug your power amp into it and it may sound better than wall, in addition to other protections it offers.

Guys who have expensive amps plugged straight into the wall might start crying when power anomalies degrade or kill their amps. You may wanna play it safe and not be crying with them too.