The Horizon SL-2 Straightline-2 has every feature that Horizon's SL-1 Passive Direct Box offers plus a -20db pad switch so you can plug any instrument or most “hotter” line level sources into it. If the signal that the mixer console receives is overdriven, simply flip the -20db pad switch and it will filter the input signal down to a better level. Built in 18 gauge formed steel boxes. Connectors and switches are recessed to resist damage.