Just want to share a little bit about how happy I am with this mid sized 1x12/horn combo. For 160 watts, I've been very impressed with how it has treated me for both practice and my stand alone stage amp with PA support for playing at church. I've been running it on the tube channel with the gain at about 5:00, volume at 10:00, Master Volume to taste, EQ just about flat, and relying on my Sansamp Bassdriver Programmable for everything else in tone shaping and utilizing the Direct out for the sound guy to get a clean signal for the house mix during live sets. One question I have run into though is the manual says that there is a green and red indicator light labeled "Power Injection" that apparently is supposed to monitor the "power boosting effects of DSP" I've ran this amp at every setting and at every volume level including diming the master and have yet to see this light come on. What exactly is this power injection about and could I maybe just have a faulty LED?