Not being familiar with the amps using line level input, I can't say for sure, but, if they do not compensate for bass roll-off, you will be disappointed. As you turn up the volume of your stock Shaker 500, the bass is defeated meaning that the line level you tapped is getting less bass signal the higher your volume setting. A lot of people, me included, use a LOC that compensates for this like the LCQ-1.
2015 Premium GT Vert/MT82/Ruby Red/401a/50 Yrs pkg/3:55s/Nav/Rev Sensors
Mods: MRT hood struts, MMR reservoir tank, Airaid Intake tube, K&N Filter, 50th shift ball, 50th floor mats, 50th trunk mat, Audison Tweets & Mids, all LEDs, Rockford Fosgate P3 Sub in trunk Future: Bama Tune