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First, thanks to everyone who contributed to this thread. I love the internet. I found out about these amps on another forum and one of the members on that forum did a lot of bench testing comparing about 10 amps. He benched the amps at 2/4/8 ohms and regular and bridged. This amp is a FANTASTIC bargain compared to the Crown K2, Velodyne SC-1250 and a couple of others. The amps more than held its own and for under $300 it is a no brainer as a sub amp.

But, the fan is annoying. So thank you for sharing your experiences about replacing yours!

I do have a question regarding fans. I researched Papst fans and found the following 24volt 80x80x25 fans.

[Part] [V] [m³/h] [dB(A)] [Bel] [mm]
8414 NGL 24 DC 33 12 80 x 80 x 25
8414 NL 24 DC 33 17 80 x 80 x 25
8414 NGML 24 DC 45 19 80 x 80 x 25
8414 NML 24 DC 45 21 80 x 80 x 25
8414 NGM 24 DC 58 26 4,3 80 x 80 x 25
8414 NM 24 DC 58 27 4,4 80 x 80 x 25
8414 N 24 DC 69 32 4,7 80 x 80 x 25
8414 NG 24 DC 69 32 4,7 80 x 80 x 25
8414 NH 24 DC 79 37 5 80 x 80 x 25
8414 NH-221 24 DC 79 37 5 80 x 80 x 25

So, is the 8414 NGL ok, or does it not have a high enough CFM? I'd like to use it if it does. Otherwise, I think the 8414 NGML would work.

What do you think? Newark carries Papst fans! So, I just need to know if the 8414 NGL/NGML will work. They are a little more expensive, but with a higher flow and lower noise level the extra $10 wouldn't bother me over the next few years. :T

If neither Papst will work, I will go ahead and buy the NMB - FBA08A24L1A from Newark as suggested.

Thanks,
Mark
 

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I am only familiar with the fan from Digi-Key NMB - FBA08A24L1A... Digi-Key part number P9739-ND.

If the manufacturers part number is the same, then certainly the fan should be the same.

I do not know the requirements needed... but I do know the fans I have ordered from Digi-Key are plenty quite for the four EP2500's I run that are located on an open shelf just ten feet in front of me. I have not had any over-heating issues thus far.
 

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If my calculations are correct, the NMB does 40 m3/h at 21dBA. This is a proven solution so I would try to at least meet this.

The 8414 NGL is good for 33 m3/h at 12 dBA. Very quiet, but falls a little short of the NMB. It might work, but it would be a gamble.

The 8414 NGML is good for 45 m3/h at 19 dBA. More flow and less noise than the NMB...but more the twice the cost ($20 vs $8.68)...and I couldn't find a pic on Newark to confirm it is the correct shape.
 

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If my calculations are correct, the NMB does 40 m3/h at 21dBA. This is a proven solution so I would try to at least meet this.

The 8414 NGL is good for 33 m3/h at 12 dBA. Very quiet, but falls a little short of the NMB. It might work, but it would be a gamble.

The 8414 NGML is good for 45 m3/h at 19 dBA. More flow and less noise than the NMB...but more the twice the cost ($20 vs $8.68)...and I couldn't find a pic on Newark to confirm it is the correct shape.
I agree with your analysis. However, I'm a little confused when you wrote, "confirm it is the correct shape."

I have communicate with the folks at Papst, so I can get a pic a post it on here if you'd like, but don't fans come in one shape? Why would Papst manufacture a completely different fan shape in the same line? Again, I'l write them an email and let you guys know if it is a different shape.

That being said, I may pick up the 12 dBA b/c I don't want to hear the fan at all and I'm concerned that I'l hear it if it is at 19 dBA. Unless you guys think I have nothing to worry about a 19 dBA. The amp sits about 10' away from me.

I highly doubt I'm going to run amp that hard because it is used to drive very effiicient speakers on my Zu Definition Pro speakers. In fact, the amp only drives the woofer array and I can't use too much wattage for the woofers b/c my front array (MTM) is being driven by a Yamamoto A-08S that puts out a whopping 2 watts per channel.

Regards,
Mark
 

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Dont worry about 19db. its inside the amp, in the back, in a rack away from you. 19db will not really be heard at all. I would be very surprised if you could hear it from 10 feet away. But you also have to think that the 12db one will be just about as good at cooling as in reality these amps dont get even warm even with spirited output. Mine does not get hot unless i am watching some reference material where i turn the sub up to its limits to show it off a bit. Either way youll be just fine.
 

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I wrote to Papst asking for pics or a URL that contains pics so I can post them here. Then hopefully we can confirm the shape.

I don't mind spending $20 vs. $10 on a fan if it is going to *nearly* eliminate the fan noise. Nothing worse than hearing the fan as the volume in a song or piece of music diminishes.

Other than the fan noise, this amp has really impressed me. I hope this doesn't sound like boasting because I don't intend it to be. Rather it is a compliment. This amp is a part of my $35k stereo system and I seriously couldn't be more satisfied.

I'll post the pics or the URL as soon as I hear back from Papst.

Regards,
Mark
 

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Here's another idea (from someone who is just about to order their own EP4000), what about a 12cm externally mounted 24v fan ?

I'm pretty sure you can get shroud that brings it back to 8cm, which you mount up against the back of the case where the internal fan is.

You gut an old 8cm fan or make your own extended shroud to ensure that you're sucking the air all the way through the 'tunnel'.

Larger fans tend to be always a bit quieter than a smaller fan, and also move more air than a smaller fan can.

You can also choose how you supply power to the externally mounted fan, either by through the existing fan slot then through a small hole in the shroud, or by a plugpack/wallwart, in which case you go for a 12v fan with a 9v or 12v plugpack.

Since all of this is out of reach of prying kid fingers, being at the back of your cabinet or rack, then I can't really see any safety issues.

With this idea of externally powered, you have the options of many different 12v fans, both 8cm and 12cm with a shroud, which should be a whole lot cheaper than 24v fans.

:)
 

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I finally got my PAPST fan and did the mod. I simply cut the wires and soldered them and wrapped the soldering with "shrinking" plastic.

The new fan is dead quiet. I mean it's not even audible. I had to doublecheck it was running as it was so quiet. I can feel the air move out front though so there is circulation. Watching Queen live at montreal on blu ray at MV-8 the amp doesn't even get warm enough that I care about it. I should add I also have installed a fan inside my rack.

Button line is, the fan mod is, in my opinion, a must if the amp is placed in a living space. It's well worth it and if I get a second EP2500 I'm so confident in this solution that I will place right on top of the one I have now, inside the rack and fire away at MV-5 all day long :)
 

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Hi Chaps,

I have seen a few 12dB fans on RS, do I need to worry about the Watt or Amp ratings on these or will it be fine as long as they are 24v?

the one I am looking at ordering is 24DC, .7W and .43mA.

Thanks,

Ad
 

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Ive just bought an EP4000 to power a DIY sub I'm going to build. I'm gonna try this unless someone advises otherwise.
 

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A quick update that may help, especially those looking for UK fan suppliers.

I purchased my 12dB fan here: http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=2991403

It works fine and is completely silent in your hand but obviously vibrates slightly as it does buzz a little when installed. This is still a lot quieter than the stock fan and still provides adequate airflow IMO.

I decided to keep the fan facing forward as I have always had better results 'pushing' air through heatsinks than I have 'pulling'.

As a final mod to reduce the buzzing I was getting, I used 4 rubber washers left over from some old PC fans to isolate the fan from the chassis. You can still hear it with your ear close but it is much better.

The photo shows the type of washers I used, they actually work better if you don't tighten the screws too much, I actually loosened them off a fair bit after taking that photo.



Cheers,

Adam :shh:
 

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Discussion Starter #139
As a final mod to reduce the buzzing I was getting, I used 4 rubber washers left over from some old PC fans to isolate the fan from the chassis. You can still hear it with your ear close but it is much better.

The photo shows the type of washers I used, they actually work better if you don't tighten the screws too much, I actually loosened them off a fair bit after taking that photo.

Adam :shh:
Hi Adam

The rubber washers sound like a good idea. :T

I get an irritating metallic buzz from my Papst fan despite the low airflow noise level.

Thanks

Chris
 
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