Ok, this is what I see:


The chassis is a L184

The head is CLS1840 1000W

The power supply is for the CLS2000 2000W.

The fan is rigged up to suck.

So, maybe you are correct, in that you have a CLS1840 modified to 2000W with the second fan being external.

However, I'd be very scared to plug a CLS1840 head in to an EST2000N!