JHS Little Black Amp Box Signal Converter Tames a screaming-loud tube amp by running through the effects loop and controlling the amount of signal sent to the power section Lets you really push the front end of your amp for the natural feel and tone that you cant get any other way Retain the response and tone of your amps sweet spot at lower levels High-grade components keep your tone clear and pure Passive design doesnt require any power Designed to be compact, sturdy, and simple to integrate into your rig Can easily be mounted underneath your pedalboard