I have a rather interesting idea for shutting up the loud fan in my Harman Kardon AVR-525 receiver. I want to use one or two ultra-quiet PC case cooling fans to constantly suck air out of the top of the receiver's case. PC cooling fans are designed to run on 12V DC, but it's popular to run them on 7V DC to slow them down a bit. I have a universal AC/DC adapter that can supply either of these voltages. If I use one fan, it seems that I could just set the adapter to 7.5 volts and connect it. But how would I configure two fans? The only things I know about wiring and electronics I've learned in the realm of DIY audio. So I know that wiring two 8 ohm speakers in parallel will give you a 4 ohm load, etc. But now I'm talking about cooling fans. I have no idea about the resistance properties of these things, and I have no idea how my little wall brick would handle fans wired in series vs. fans wired in parallel. I also have no idea if either scenario affects the voltage delivered to each fan. Will fans wired in series from a 12V source each receive 6V? Anyone have any advice for me on this? THANKS!