There are a lot of queries in HFVfourm regarding the UPS, today I came across this wonderful site. They charted the output waveforms of the most commonly used UPS. Hope this will help FM to pick the right one for their HT set-up.
www.hardwareinsights.com
Database of UPS inverter output waveforms (updated)
Contents1Introduction1.1Revision history2APC (Schneider Electric) Smart-UPS (stand-alone)2.1Smart-UPS SC3APC (Schneider Electric) Smart-UPS (rackmount)3.1Smart-UPS SC4APC (Schneider Electric) other5Others (A-F)5.1Ablerex5.2AEC (Armen Electric Corporation)5.3Belkin5.4Best Power...