I was looking into those once as I have a noise from an AC and a guy from the partexpress technical forum suggest me to contact a guy that use to work for a respectable company in change of power conditioners for medical devices, and he told me that unless you get an interactive Power Supply conditioner, that means that protect you from over and under voltages and over this had a filtration for the line, and a rectification, etc... you won't get a good job "done", he even suggest me some UK made ones (don't remember the name now) very expensive that BTW had nothing to do with the company he worked for, at that time.
Sorry but the HTS2000 is a just surge portector with some filters, period, but nothing else, that means that protect your equipment for over, but if the voltage goes lower, it has nothing to fix in that case, and sometimes the lower voltages are more frequent and cause more problems to the sound quality than the high voltages, I have an old APC Smart UPS1250 (900VA) with 2-12v batteries inside of about 17Ah each, that rectifies, protect you for under and over and is 24/7 interacting with the line checking voltage freq etc, etc, that gives you 120volts and 60Hz steady, and I have never complain about it, not noises or anything like that from the line at all, the power is steady and dead silent......