Romex to your amp?

Do people know that transformers in linear power supplies are pretty effective at filtering high frequencies?  Any idea the ratio of the inductance of 40 feet of house wire versus a transformer leakage inductance? 


How about likely the most critical aspect is ground continuity between equipment?


I am curious what, in all these theoretical ideas do people think they they are improving and what is critical? 


Solid wire is used because you don't get loose strands or broken strands, not because it conducts better.


With a small power transformer bandwidth, why do we care about 5 -9s copper or crystal grains when people who make 10ghz+ cables don't?

THHN = Thermoplastic High Heat NYLON.


THHN is not Teflon. Teflon is used for wires 99% of the time or more for temperature rating. A small amount of time for chemical resistance. It is also used for very high frequency cables (>several GHz) and even then not always.


Long 50/60Hz runs have long been multi stranded due to skin effect. There is no magic. Big difference between 100km and 2 meters though. I am sure Siemens is well aware of why in some instances stranded matters or does not. Guess what ... The transformer wire that the expensive cable hooks up in your equipment to is not stranded, is not 6 nines copper, is not directional, is not silver, is not single crystal, is not teflon coated.


Normally for AC cables we want to limit high frequencies somewhat not encourage them.

The 40-50 feet of Romex in your house can cause voltage modulation of the AC under high loading from an amplifier, even more than the wire from the transformer to your house.

It really does not matter if the sine-wave is perfect 60Hz or not, the current draw isn't. It has high frequency components from the conduction angle on linear supplies or switching sources.

I am not advocating one way or another for cables, just stating the reality.

Ground connection between equipment can be critical. That is not covered by in wall Romex.

The "light show" is the huge current draw charging up the capacitor bank of the power amps, which is not necessarily indicative of a significant continuous power draw. Those peak currents can easily be 50+ amps.

Are you running a common neutral for the two outlets or completely separate live/neutrals?  Are you using a tandem breaker with a common throw? .... if not, you should put a sticker on the outlet warning of dual supplies.

The Authority having Jurisdiction, ultimately the local government often passes laws/bylaws that accept in full the NEC. They have to to have legal authority to enforce compliance. Lack of compliance is a civil violation not criminal but you are still breaking the law. Negligence can become criminal of course.


UL ensures a level of safety compliance and UL standards also have relevance to NEC. That power cord may not need to comply to UL, but it would likely need to comply with NEC (and your insurance policy). Outside the US, many countries require only conforming products to local standards.  A UL is not good for "5 years". It is good till a new standard is released and while you maintain your listing.


I am curious about this internal distortion and dynamic loss of stranded conductors at audio frequencies science seems to have missed.