House Amperage vs Stereo Amperage

If you stand on a wet concrete floor and place a finger over the positive and negative poles of capacitor of a recently turned off amplifier you will find (via your hair being on fire) that energy is, indeed, stored in capacitors, not transformers (except as the transformer acts like a capacitor as a by-product).

I am not aware of any home audio transformer that requires 30 amps steady state(roughly 3700 watts at 115v).

If you are curious about your audio current draw buy a "Kill a Watt" digital meter through Ebay which will give you a real-time amperage/wattage reading.

I am not connected to "Kill a Watt" in any way or have one for sale.

Sean has a point, but... If an load device has the ability to draw more than 15 amps (steady state) it will not be certified by UL to be furnished with a standard Nema 5-15 (straight two prong one ground)power plug. If your product is designed to draws more than 15 amps on anything more than a transient basis and you equip the product with a 5-15 plug you are violating UL and NEC rules and leave yourself open to both civil and criminal liability if injury or property damage results.

There is no doubt that a load higher than 15 amps may be drawn for very brief periods(such as motor start or musical peaks)but, as noted earlier, these loads are transient. HD motors and audio-amplifiers usually have capacitors specifically to cover this temporary situation.

If you think your Sunfire can draw more than 15 amps steady state (no matter how inefficient the load) just hook it up to a Kill a Watt and use a test record for whatever frequency you want for as long as you want. I would be amazed if you show a 15 amp + draw and/or you pop a 15 amp breaker.

The point is this is why G-d and/or the EE wizards have created power inlet/output plugs rated for more than 15 amps. My air compressor and air conditioner have a NEMA 5-20 plug and require a twenty amp 5-20 outlet and circuit breaker.

This question sometimes goes into la-la land where there is a "mine (dedicated circuit) if bigger than yours". So, put in a 100 amp 4ga circuit if you must for your 100/100 watt amp. It might make you feel good but the electrons won't care.