If i am not mistaken It seems Most High Power UPS in the market like APC or ABB are not good for high dynamic loads (high crest factor like Music signal) and the load transient response of these UPS is not very good at rated power. APC , ABB and ... are designed for IT/Server/Computer rooms not for music systems.Yes i know the subject is complex but I can guess the first step is going for fast load transient response of UPS.
deadbeat control for UPS
The deadbeat controller is an attractive control solution for many applications where the fast transient response is required.
The control strategy is the most important part of all UPS systems. Parameters like THD of the output voltage, dynamic response to the transients and spikes; power factor correction, voltage and current regulation etc. are all dependent on the con- trol strategy applied in the UPS system. Nowadays many modern control techniques have been proposed to provide regulated out- put voltage in all the circumstances. Broadly the control techni- ques can be classified as single control and multi loop control schemes
Pure power 3000 is a successful model for under 800w load and i think If Richard (purepower) improve purepower in both "power" and "transient response" then I can use it for my high power class ab system.