I can't really place the amp out of my room unfortunately, and I don't know how you could make a hush box that's really hushed for an amp and still get airflow - at least not with this stock loud fan. I wish I could do what you guys suggest and put it out of the room, but I don't see a way unless I run a 40 foot RCA signal cable which would likely pick up noise and end up being a frustration...
I did the dirty deed last night and cut the steel chasis grill out
- so much for warranty. I'm committed now. I've got a nice big clean cutout circle in the back of the chasis....
I thought this mod alone might make the stock fan tolerable.
It didn't. The main problem wasn't apparently the steel chasis grill, but rather the heatsink on the other side - or perhaps both, but cutting out the grill made very little if any difference because the noise is now very much from the heatsink budded up to the intake side of the fan.
I got an RMA on the previous Sunon fan and am now stepping down to this Sunon fan. It is only 25mm wide instead of 38mm wide. I know I faulted that guy on CHT for ordering a 25mm fan in the JTR thread, but after a lot more comparisons this 25mm fan has better stats than the equivalently db level 38mm wide fans. I sure hope the stats are somewhat accurate, but my last bout with the 37dB fan that measured 79dB has shaken my confidence a bit. I've still had a pretty positive experience with Sunon fans overall -so I'm just going to ignore my last fan experience. Anyway I think 25mm may be okay after really analysing the internals of this amp. the 38mm is RIGHT up against that big heat sink and the same OEM fan that moves a lot of air outside the case, just makes a lot of noise inside the case and moves very little air. (Even less with the big steel chasis grill in place that I cut out). I'm not sure why it was engineered the way it was. I can still leave the little white plastic chasis piece in place and use a 25mm fan which won't bud up right next to the heatsink. That little bit of room and the cut out circle on the back just might allow the 25mm fan to move more air than the stock 38mm and it will SURELY (crosses fingers) be quieter. I also am consoling myself with the reading I've been doing in the manual about all the protect from thermal damage engineering that is supposedly in place on this amp. If it gets too hot (>90c) it just shuts down. Supposedly it won't grenade like my EP4000 did with too little of a fan.
Anyway here's the fan I just ordered. 34dB - autorestart, 70*C operating temp, .16 static inches H20, 75cfmhttp://search.digikey.com/scripts/Dk...777&DPU=submit
Edit - After I ordered that fan I just saw page 25 of the manual says a fan is required with 80CFM rating - so this is right on the bleeding edge.