The steady and switched aux power outputs (on the left side of the control) are limited to 1.25 Amps and should be less than 1 Amp (in total) if you're following UL standards. I'm not sure what the current draw and limits are for Output 1 (where I have my inside speakers connected) .. anyone know? I was planning on connecting Out 2 (set to voltage out) to the Elk-120, but that output is current limited to 1 Amp. I'm assuming that the 1 Amp limit on Output 2 doesn't have anything to do with and don't impact the current limits on my power outputs on the left of the control (steady and switched aux) ... can anyone confirm that for me?

Even if that's true ... if I understand the current draw of these speakers (eg. http://www.ebtx.com/mech/ampvolt.htm), 50 watts and 8 Ohms ... I'll be pulling over 2 Amps when I connect all four speakers ... Watts (50 watts peak * 4) / Length (8 ohms) / Volts (12) = ~2.1 Amps ... am I doing that right????

The 4 strobes each pull 140mA ... or 0.56 Amps in total

I'm also about to hook up an Elk-M1XRF (wireless receiver), which apparently pulls 70mA as well.

Seems like I should be fine keeping my system the way it is now and connecting the M1XRF to the control without any power modifications.

However, to power the outside speakers and strobes it seems like I need to get an additional power supply. Until I started doing the calculations, I was planning on getting the 1 Amp power and battery enclosure, but I'm wondering if that's going to be enough ... seems like I need to get the 4 Amp supply ... but there is a little bit of a price difference so I don't want to go that route unless I need to.

Can someone put a second set of eyes on this and make sure I'm not missing anything?