I was considering the forthcoming Audiolabs MDAC. It will have an exrternal power supply connectd by Mini DIN (9W + Shield so 10 Conductors). The Pin arrangement is 3,4,2 (+ Outer Shield). MDAC:- +15V Analogue 500mA, -15V Analogue -150mA, +15V Digital +150mA. This is John Westlake's latest ESS Sabre32 design. DAC/Pre-amp like the Audiolab 8200CD/CDQ without the CD player.
I currently have a Wyred4Sound ST-500. Class D, therefore supposedly efficient.
Any concern about voltage fluctuation with these 100AH lead acid batteries?
The problem with getting battery power to a unit like the MDAC is the output section running a differential power supply with +/- voltages. Makes it kind of hard to do so.
I have a couple of 41Hz T-amps here that take 22VDC which can be done with either a 24V or 2-12V batteries in series. You can determine what the Wyred amp needs and see if it is worthwhile.
With a Ctek auto sensing charger attached to my batteries in maintenance mode (a 3300 on the 26AH and a 7002 on my 100AH) there is hardly any voltage swing. I read the 26AH every day, perhaps several several times a day and it is always at 13.41-13.42VDC as measured with my trusty (crusty?) Fluke 87. A good mid sized battery are the 32 and 45AH sizes, BTW. My 100AH is rock solid with the 7002 charger and that Ctek charger is virtually silent in use. I leave it attached constantly as I do the 3300 with the 26AH. The 3300 is maybe, MAYBE a little noisier. It is hard to tell when using it to power a Mach2 Music Server.
Sorry I wasn't quick on the draw with a reply. I was out in the shop finishing up the enclosures for a RevB and some Ubers.
Been hectic around here with a parade of house guests over the last couple of weeks.