Juggernaut (audio) -

(available as the 500 series module or the Juggernaut Twin rack unit) is a Class A discrete preamp known for its extreme versatility, often called a "desert island preamp" .

: The +THD button pads the output by -10 dB, allowing you to drive the input harder for more harmonic saturation. The Boost function provides up to 25 dB of additional gain. JUGGERNAUT (Audio)

APA Juggernaut 500 Fe Mic Pre/DI with Iron Output - Atlas Pro Audio (available as the 500 series module or the

: It features a continuously variable rotary control for input impedance (ranging from 300 to 10,000 ohms), which acts like a "tone control" for different microphones. APA Juggernaut 500 Fe Mic Pre/DI with Iron

: Found on newer models like the Solo, this uses passive inductors to mellow high-mids and lift the low end.

: Its standout feature is the ability to switch between Iron and Nickel input transformers with a push-button. Iron provides more "color" and saturation, while Nickel offers greater bass extension and lower distortion.