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I use a 170cfm with my 400w in a 2.5'x2'x5' box and I haven't had a problem. I also use a cool tube though so that could help. The temps in my box are around 7o above ambient, so no hot rooms but it's perfect for a basement or room with AC.
It would be best if you use an air-cooled hood and if possible 6" fan/ducting with a speed controller. If you use a bigger fan you will be able to dial it back with a speed controller to achieve the lowest sound output possible while still adequately cooling the cab.
I do plan to use an air cooled hood w/ 6" ducting. Does this HPS look like it is of good quality?
I'm worried about that fan though, Dr. Penguin. Can you give me more information on the quality of fan speed controlers? I can't justify buying an autotransformer or a VFD. The Capacitance control looks to be the best option for me, but how does this device work with the fan/wall outlet? and how well would you say?
-------------------- "We are here to awaken from the illusion of our separateness" - Thich Nhat Hanh
You won't want to dial your speed down very far if you use a 4" 170cfm so a speedster type controller would be perfect for you. All you have to do is plug one end into the fan and the other into the wall.
If you go with a 6" you'd be better off with the 3 speed type of controller because it will dial down farther without humming. With the three speed controller you will need to cut your ballast cord, strip the end, connect two sets of wires with wirenuts, and reassemble; very easy, there will be instructions in the box.
If you can save up some money (I got my for 50$ shipped) and find a variac that would be your best bet though.