I've done the fan swap on one of my DSP 6000 units with the Enermax fans.
A few notes:
1) the two stock fans on the DSP 6000 weren't as loud as I was expecting at idle. I suspect they were quieter than the single DSP 3000 fan was at idle if memory serves correctly. I imagine in some rooms the stock fans would be acceptable. I sit very close to my rack and they are borderline acceptable in my room with the rack door closed. The single iNuke DSP 3000 fan in my 2011 purchased iNuke was a Bi-Sonic Model BP802512HL-03, DC 12volt, .40A fan. It was pretty loud at idle - like no way it would work without a fan mod in a home theater environment where you sit close to the rack. By comparision , the new iNuke DSP 6000 model has the NMB-MAT7 fan, Model 3110KL-04W-B70, DC 12 volt, .38A.
a) The DSP 6000 model has two fans and the leads are probably very nearly a foot long on these stock fans. The fan connectors on the amp mainboard are a long ways away from the fans themselves - like on the other side of the case. By contrast the iNuke DSP 3000 has a very short fan lead, and the fan connector is nearly immediately next to the fan mount.
b) Luckily the Enermax fans have a very long fan lead as well and they were easy drop in replacements.
2) The entire white connector easily pulls off on the iNuke DSP 6000 mainboard - just like it did on the DSP 3000 and you are left with two bare metal prongs. You can easily slide the new connectors onto the prongs and make them flush with the motherboard and the connection is secure enough that they aren't going to come off. I secured the fan wires to other power wires in the case with a plastic zip tie to ensure they didn't touch anything hot and melt.
3) The stock iNuke DSP 6000 fans are sufficiently powerful, they push a lot of air, even at idle. When I held the iNuke amp down next to my knees at full arm's length holding onto the two handles I could feel air on my face from the fans blowing out the front of the unit at idle. The Enermax fans are pathetic at air movement at idle. By contrast at idle I have to put my face immediately next to the front of the iNuke amp to feel any air movement. I don't know if this is sufficient air movement or not. I read that someone else said they had 27cfm fans and were successful and that's about what these Enermax fans are rated out so perhaps they'll work out alright. Hopefully someone with a successful fan mod can comment on how much air movement they feel out the front of their units. I know the fans will ramp up and move more air as the amp bears a load - but the delta in air movement at idle between the stock NMB-MAT7 fans and the Enermax 80mm fans is astounding. The Enermax fans are pretty much completely silent from more than a couple inches away, but given my experience I can't recommend buying them until I have some time to test them. Unfortunately I won't be testing them until April timeframe at earliest because of the delay with the Dayton Audio Ultimax 18" drivers. I think at this point I would recommend a proven fan like the Noctua 80mm, or the Vantec Stealth over the Enermax to ensure there is enough air movement. (I know the Vantec stealth is significantly louder than even two Enermax's but it does push more air and is still quieter than a stock iNuke fan). If I find out the Enermax don't cut it - then I can probably actually go back to the stock fans, because I didn't find the NMB profile too terribly loud. Louder than ideal --- yes....but not screamers, and not as loud as a stock EP4000 or iNuke DSP 3000 IIRC. Ultimately I can reuse these 80mm Enermax fans on a PC or something if they don't cut it for the iNuke's. It's probably what I get for trying to save a few bucks over the tried and proven fans.
Here are a couple pictures of the fan mod job on one of the DSP 6000 amps.Edited by Archaea - 2/18/14 at 10:16pm