Quietest fan...regardless of CFPM

+1

I also have a couple of QSC 2502's and would also like to do a fan mod on them, the EP2500 was an enormous improvement modded, now its quieter then the QSC's. That would place the icing on the cake for me with my pro gear in my great room...

So any links would be great...

I used 2, 12v Enermax enlobal fans. Super quiet, but compound loading the fans (butting them up against each other) increased the CFM and noise.

You could run one of those AND a resistor if you want, though there wouldn't be much air flow.
http://www.svc.com/fan-uc-8eb.html

If you're running 12v fans check into Noctua.

They design their fans from top to bottom, inside and out. Their is nothing that they overlooked.

Their quiet model couldn't be heard in a library!

Silenx 14dB @ 32cfm
Noctua 17dB @ 32cfm
Enermax 14dB @ 24cfm
Enermax 17dB @ 36cfm

then we have the super low dB
Silenx 9dB @ 20cfm

Why not use resistors? Its almost free. You can get variety packs at RS and experiment until you get what you want. I think I ended up with 100 ohms in a crown.

Cant hear the fan and there is still positive airflow. The vent has the dust bunnies to prove it

If your amps have two fans wired in parallel, you could re-wire them to series and do the same thing.

We need third party tests.

Those ratings are actually too low. I think at that low of a level you'd have to be in an anechoic chamber.

Or do they mean that many dB above a certain ambient noise floor?

Thank you logic?

Read more on that SilentPC site I linked to.

Funny that this thread just started. I ordered a fan (P9739-ND) from Digikey today to mod my EP2500. I am not sure if it is the quietest but it was recommended by another forum member.

I just find funny that I had always read about how load the fan in the EP was and always thought folks were making it out to be a bigger deal than it was. It took one day with that fan to make me change my mind.

Everyone seems to do 1 or 2 fans per EP but has anyone does 1 fan for multiple EPs? Seems a squirrel cage fan could move a lot of air while spinning slowly. (read quietly)

Not that its a good idea or not but this is a DIY forum and there may be other datacenter management types. They seem to be going for more direct active cooling rather than encompassing ambient these days.

That's the way it's done in equipment racks in airplanes and such.

KGV,
what voltage is the fan in your QSC? I doubt it's a 12v unit.

i did the digi key fans . i did one in my ep2500 . worked great cant hear them from 2feet away . so i put the same fans in my qsc 2450 1450 and 2 - 850's.they are cheap and work good .

Its the newest thing in datacenters now too. I just attended a seminar put on by HP on the subject. Instead of cooling the ambient you direct cooled air into the racks or even specific machines and then funnel it away. Thanks to temp gauges on the in and out of each circuit you know which machines need more airflow or cooler temperatures. It gets very costly at anything besides small scale and HP just happens to be selling the installations.

One large squirrel cage fan can move a whole lot of air at a slow speed. It leaves you with a single point of failure but its only a musing at this point. I'm sure someone could add a little FT to it.

I have the Scythe S-FLEX SFF21D in my CE4000s

8.7dbA @ 800rpm producing 33.5cfm

about $15 online

Inaudible for all practical purposes unless your ear is inches away. The use some kind of Sony fluid bearing and claim 150,000 MTBF

Dr V

I have that same Scythe fan, and you can barely hear it when it's up to your ear. It doesn't move that much air, but is plenty to keep air circulating in an equipment cabinet. The power supply is 12v, but the one that was sent to power it has two power leads, so for the price, you could get two fans hooked to it. This is where I ordered mine:
http://www.coolerguys.com/sff21.html

Acoustifan Dustproof is another of the worlds most quiet 12v fan available at an almost immeasurable <10dB from a meter away.

http://www.acoustiproducts.com/en/ac..._dustproof.asp

From a couple of meters away they're completely silent fans but don't push a lot of air either.

Just a word of advice, take those manufacturer's claims of audibilty/dbs with a grain.

Many are skewed by marketing and do not translate into real world. When I was looking to do my mod I remember reading several indpendent tests that revealed much higher levels than those advertised.

they are 24 volt . i have tried doing the resistor . dont bother it is still very loud and does not work well . digi key has cheap fans. also do not believe any specs . my amps never get hot even when playing music for long periods at high volume . movies do not heat up pro amps action scenes are not long enough.

BTW the qsc take the same fan as the ep2500.

I just purchased the 24v fan from Newark for an EP2500 which is way louder than my computer. Hope it goes well, I'll let you know, oh yeah it was under $10 shipped!

I applied 200 ohms of resistance on top of a suggested quiet 24v fan to my EP2500 to get it down to a bearable point for me. Sorry I don't remember the fan, it was noticeably quieter than the stock fan, but still much too loud.

Out of the box it was much too loud to be in my room. The aftermarket fan cut it down a little and had more subtle note to it, but it was still to loud for me. After the new fan and the resistors it is now in line with everything else (Plasma fans, 40gb quieter version of the PS3 running, etc.). Aftermarket fans are a crap shoot.

My point here is you may need to do both, and 1-watt resistors are awfully cheap. May as well have them handy when you do the fan mod because you may find you need both.

Pana-flo "hydro-wave" bearing fans are traditionally some of the quietest fans out for the money. Yate-loon fans are also traditionally quiet. Make sure you buy the proper voltage rated fans as most cheap fans you will find will be 12v and if you are modding a pro-amp, you likely need a 24v fan.

Ok I received and installed the 24v fan from Newark. In my opinion it is NOT an adequate replacement for the EP2500 fan. The Newark fan is needlessly quiet, greatly sacrificing its ability to move air. Rated at .09a the OEM fan is .25a!!! Whoever posted this was the fan to use is mistaken. I feel very uneasy using it...

Just wait till the amp warms up and the fan speeds up some. For HT use it's not bad. But for full power continuous sine-waves, not so good. Actually for that type of use you need a whole different amp.

I'll take this post for a public service message:
Even with the fan installed blowing in the right direction, installed exactly as the original, I still had cooling issues, the red clip light would come on occasionally. This was with with the .09 amp fan. Put the original back, and it's all good. (but in a different room!)