Looking for Linear Power Supply for my Mytek Brooklyn DAC. Suggestions?

wsrrsw-
Was there an improvement in SQ?

The Mytek literature says, "Mytek Brooklyn DAC is equippped with external 12VDC power supply input. There is some sound quality improvement (particualrly deeper base and better soundstage) when a large external power supply is used. To have an effect the power supply has to be substantailly (5-10 times) larger than the 30W internal power supply. Here are some option which have been used by our customers. Mytek has not yet conducted testing of either of these." 

Erik-
The specs of the Astron are more in line with Mytek recommends.
Did you make any voltage adjustments? Are you using with a Mytek?

Anyone ran the Mytek Brooklyn on just batteries. Maybe buying 2.. keeping one charging in the Garage? Are there batteries that are recommended for just this purpose? Anyone guess how long a charge would last?

George - thanks
I really hadn't considered a battery of that size. When I initially thought of battery power, I thought of motorcycle size batteries and recharging them in the garage. With your idea, if the battery would last 5-6 hours and I could recharge them on the Kitchen circuit, which is 5 feet away from my music room, this would be, inexpensive and great sound quality.
One of the best preamps I've heard is the Dodd Audio (battery). I have a Musical Surroundings Nova Phonomena phono preamp (battery/wall wart option), and all of these have preformed very well. I'm trying to remove all wall warts from the same electrical circuit from my music room. After changing the power supply, to the Mytek, I have the Google fiber and the MacBook Air power supplies to evaluate.