Features Output Tubes: 2 x 6414W NOS USA dual triodes Input Tubes: 2 x 12AT7A NOS GE specially selected by Manley Labs for lo-noise and stable bias I/O: MANLEY transformer coupled Balanced Inputs and Outputs Micpre: Selectable 48V phantom power and PHASE REVERSE Gain: 60dB max Micpre, 43dB max DI, 20dB max Limiter Gain Description Product Description SLAM! stands for "Stereo Limiter And Micpre" and it pretty much describes what it will do to most VU meters. We had to put a switch on this limiter to drop its internal VU meters down 3 & 6dB to keep the poor little needles from bending- it'll get LOUD fast (hence the exclamation mark). And on top of being an amazing pair of (actually four) Limiters, and Class A tube mic preamps, it also has masters degrees in DI, AtoD and DtoA, VU and PPM but that was too much for an acronym.