I bought this amp to run 2 achat 115 Subs.
It most definitely had the power to run them which is perfect, and it had enough headroom too.
The original setup was a sub on each channel. However, because I planned on doubling my subs in the future, I decided to 4 ohm test the amp on one channel. I felt like it struggled here, I wasn't getting the same punch as I got with running 1 per channel, I have reason to believe the 4 ohm rating of 1200w does not apply to <100hz.
Another downfall of this amp, unfortunately but expectedly, is the noticeable high THD output when being used with subs (same deal with the E800, and likely the others in the series too). You can easily hear the harmonic distortion through the unfiltered input of a sub, alongside this, there is a lack of detail in the low frequency range and the amp behaves sluggish with fast transients.
I would have preferred the same functionality of its smaller brother, the E800, in terms of Sensitivity switching and ground lift.
This amp has now replaced an E800 i used for tops in the same rack and the E1200 was replaced by a Powersoft M30D, I won't compare those two amps as it would obviously be unfair.
Overall, The E1200 seems to live up to its spec at 8 ohm and it certainly works with subs very well for the price.
