ONLY 84% efficient??!!??!! As measured by who? As measured by what equipment? As measured by what standards?

First of all that's REALLY efficient in the world of car audio amplifiers, REALLY efficient. Especially when you compare it to a Class AB amplifier which anything over 50% is great. Second of all it's impossible to know with any certainty how accurate that efficiency rating is. There are many painstaking steps to ensure accurate measurements of anything and I can guarantee with a fair amount of certainty that the efficiency rating that is published is not 100% accurate. The few I've seen that were done properly were that high with a 4 ohm load and went down each time the load did. I saw a test by a reputable engineering firm on an Audison Class D (high end amp) that was 85% efficient at 4 ohms. It dropped to 81% at 2 ohms and went to a dismal in comparison 69% at 1 ohm.

If you want to get another Q1200 go for it. It would be a fine amp on that sub. The one nice thing about the PPI or similar is having the overhead and another is it's a little cheaper. In the end it's all up to you but I don't see how 84% efficiency, or anything better than a Class AB would affect a purchasing decision.


What coil configuration did you get on the LI?

1 it says its 84% on soundqubeds website. 2 I got it in D2 so I can run it at 1ohm