The SpeakerPower amps are efficient, quality, high power amps made in the USA.
20 amp circuits can pass quite a bit of power for a short duration, like those peaks in movies.
From FOH's post
"A 20 amp circuit can pass 7-8 times the rated 20amp trip amount, .. for up to a second or more. It will allow up to 3x the rated amount for up to 10sec or so. And most importantly, the same 20amp circuit, can allow up to 1.5-2times the rated amount for a period extending as long as 30 seconds.
* That's over 100amps for around 1-2 seconds, about 60amps for around 10 seconds, and the circuit will allow 30-40amps for as long as 30 seconds! From a 20a breaker."
FI is a well known build house, they are doing the triax drivers for PSA
"The driver is produced to JTR specs by the Fi build house, as are most heavy duty subs that are made in the US. Ascendant, Fi, SSA, PowerSound uses some, JTR uses some, SMD, etc..."
Multiple drivers increase system efficiency.
They had to change driver build house to FI after some issues and are getting a better driver than anticipated, and the price will be going up soon. They use good parts, the cabs seem well built, and they seem to have some great finish options. What's not to like about the Triax, especially at that introductory price?