Red wine audio makes battery power packs for audio equipment.
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I have read 'computer battery backups' are not ideal for audio although I have never tried it. BUT take into consideration that for computers there are 2 types of battery backups. First is just that - a backup meaning you run off of wall power until power fails and then it switches to battery. The other is an on-line UPS meaning you always run off of the battery.
That being said there are 're-generators' made just for audio. 2 that come to mind are PS Audio and PurePower. I just got a PurePower 1050 and run my source - integrated and sub off of it. It lowered the noise floor for me and does not restrict dynamics or power. At a fairly loud level of listening I tripped the circuit breaker and listened for 25 min and the battery level dropped to 50%. I do not know at what point the PurePower shuts down (depleting the batteries to 0V will be the end of the batteries) so there should be a point where the unit shuts itself off to protect the batteries from totally discharging.
most computer battery backups apparently sound atrocious...putting lots of noise out.
I've used the Red Wine Audio battery supplies (they are not for back up, they replace the AC). My Nagra PLL and VPS (pre and phono) have off board AC supplies and the main units take 12volt dc in..so the Red Wine Black Lightning was fantastic improvement. You have to spend a lot in AC conditioning to maybe equal the red wine battery's...
Does your DAC have a DC input? If so, I bet this route makes it sound better...
Computer UPS systems are not good for audio components because most of them produce square wave AC when on battery backup, as opposed to low distortion sine waves normally present on the AC powerlines.
The square waves are highly distorted and have a lot of high frequency grabage you do not want being fed into your analog power amps and preamps. While your input transformers will filter some of this crap out, it may also cause them to run hot or make noise.
Also, because the equivalent RMS value of a square wave has a lower peak voltage, the voltage level of the rectified waveforms will be lower, resulting in a lower filtered voltage in your power amp or pre-amp. A true square wave will have only 70% of the peak voltage of a sine wave. Which means a power supply of 50V (on AC sinewave) will only be 35V with a square wave. This will create obvious operating problems in your amplifiers.
There are some products that produce true low distortion AC (like the afore mentioned PS Audio products), but brands like APC do not. Edit: APC may make true AC sinwave generators but they are for larger industrial applications and are very expensive and not suited for in home use.