So I was trying to calculate the current more acurate, but something didn't add up. Long story short, it's not +-18v that was used, it was +-9v.
Ok. I'm building an active noise cancelling circuit. The circuit get noise from Mic J1 left and right ear, J2 is music in, and J3 is output. I did not create the circuit, and I'm simulating everything and creating the PCB layout in NI multisim. The circuit is simulated and is working fine, I just don't like to use 9v batteries, and rather try to replace them with something else.
I went through the data sheet for the NE5532, and if I go under +-9v I will get clipping. I can use max 4 AA batteries, but anything more then that is just going to be a bother, and it would be easier to use two 9v batteries. So I can get 6v, that I could turn, 6v to 12v, 12v to 24v, and get +-12v. I was afraid that the loss in step up converter would be to high to gain anything, as audioguru pointed out.
I'm an student for analogue electronics, and this is a side project that I'm doing mostly for fun.