I think those PC backup power supply units sound pretty bad. Why not try it with and without the UPS?
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A component's power supply should ideally be indifferent to the source of the power within certain margins. If things between the back of the box and the power plant make a difference, that's a basic failing of the power supply. I'd pour my money into making the power supply more resistant to minor variations in the power source before trying to doctor the problem with expensive Band-aids.
The APC UPS puts out terrible, square wave power that’s full of noise that even the best linear power supply can’t clean up. The APC also doesn’t cutover cleanly from utility power to battery power. You could go with an on-line pure sine wave output UPS like the Eaton 9130. The only downside of the Eaton 9130 and other high quality output UPSs is they have noisy cooling fans, so they need to be located outside of the listening room.
@kosst_amojan your message is contradictory. Re-engineering a power supply will be nearly impossible for most people who don’t have the knowledge or means. Even for people who have the knowhow, the cost of upgrading power supply upgrade parts and real estate limits inside the components is another limiting factor. It is infinitely better to solve the problem at the source by adding a good UPS or at least a good power conditioner.
Noisy expensive UPS located in another room does not seem like a reasonable solution. I’m pretty sure I had a dedicated circuit installed in my media room last time I had an electrician over. I think the variability in electricity in my house comes from the source. My whole neighborhood has issues. I realize that is a limitation. I didn’t want to put that stress on my equipment so I got the UPS to help minimize the impact of these occasional brown outs.
Would going to a wiremold powerstrip and then to a UPS help?
Is there a reasonable priced UPS option that is not noisy that would be a significant upgrade?
Should I not be concerned about the variability and just use a wiremold?
Would one of those Blue Circle or other power conditioner products in between the equipment and the UPS help?
Is there a reasonable solution that I could hire an electrician to help with?
Kost is also contradictory because he is stating "an ideal power supply", which doesn't exist even in the most expensive equipment. The problem is that the audio electronics run half from the internal power supply and half from the incoming A/C current. So anything external will definitely affect the sound (such as power cords, outlets, fuses, UPS).
sleepwalker had a suggestion with the Eaton UPS. That will provide 100% coverage (within battery limits). The only other thing I can think of are the Furman power conditioners with the "current reservoir". This is a capacitor inside the power conditioner that provides a smoother A/C voltage when there are dips in the incoming A/C current. It may help fight the "hiccups" you are experiencing, but it will not do anything for the outages. Two examples are Furman Elite-15 PFi ($750) and Furman Elite-20 PFi ($1299).
A good UPS will cost somewhere in the neighbourhood of $1000 to $1500, depending on inverter output quality, battery capacity and inverter capacity. I was able to score a few surplus 1500VA Eaton 9130’s with one string of batteries (all you really need for hifi) for $250 each. It’s all time and place. The 9130 has 9-factor power quality correction (surges, brownouts, phase, blackout, transient noise and others), and produces the vitally important perfect sine wave output, free of harmonics. Just keep your ear to the ground on fleabay and Kijiji for similar deals.