I've read a lot of doubling the voltage from the forums, it seems it might do good for me too. I'm just worried if it burns the entire preamp, so does anyone know if EDB's can take the 18V? Also if someone has done it, had it any effect on anything and what kind? Is my thinking correct that it can be done by plugging the other battery's + into the connector's - and the other battery's - into connector's + and then combining the two free what-the-heck-were-they-called? (that's a clear sentence... interesting to see if anyone can make anything out of that.. ) This way the batteries would at least be in series and connected to the circuit..