Thanks for documenting the fan swap. This thread has been stickied.

 

I heard somewhere that using silicone mounts on the fan helps to reduce alot of the noise. maybe it is worth a shot if you have some?

 

Silicone mounts may help but my opinion is that the main cause of the wind "noise" isn't so much the fan itself.....it is the sound of the air being vented by the black looking "cover" of sorts that has to be removed before the stock fan can be removed. The stock "shroud" seems to direct the flow of air from the fan in a downward manner and I think the rush of the air from the fan moving inside the shroud is the biggest noise culprit.

You can see in the last photo I posted a pic of the new fan installed without the shroud - when the amp was plugged in and tested this way it was very quiet even with the top off.....however when I then placed the black shroud back in place the noise returned and even with the amp cover back on the fan noise was worse than with the amp opened up being tested with NO shroud in place.

Perhaps the best solution is to ditch the shroud - my only concern would be overheating and diminished protection for the internal amp parts that may need it the most.

My amp will be sitting inside of a rather snug stereo stand and I think this may help mask some of the "wind noise" that I can currently hear with the NU1000 while I test it out on my kitchen table.

 

Could you just open of the shroud a bit by cutting the inlet back some ?

 

Good question - here is the answer - follow the YouTube link below - today I shot a quick HD video of how to replace the fan in the iNuke amps and just posted it to YouTube......in the video I actually took your suggestion and removed the stock fan shroud and "trimmed it" to size. The end result is a somewhat improved fan situation - compared to the aftermarket fan/stock fan shroud, the new combo of aftermarket fan/modified fan shroud is an improvement.

Ultimately ditching the fan shroud would basically reduce fan noise levels to nearly inaudible......or making this simple mod to the fan shroud will get you one step closer to having a quieter fan. Check out the video for a look inside the NU1000.

 

Is the fan a standard computer fan size? if so, what size is it?

Thanks,
Jim

 

I wounder if you could glue a thin bit of foam to the inside of the plastic shroud ? That should reduce some noise too.
So the fan is a 12v PC case fan ) good news as there are lots of silent mod fans out there.

Great video thank you. :clap:

 

If you really want to drop the noise level, I recommend this fan:

http://www.vantecusa.com/front/product/view_detail/113

 

Thanks - may give it a try. I have lived with the current inuke/aftermarket fan combo for a while now and I definitely want to take the fan noise down another notch or two.

I am quite impressed with the amp - the 1000w rating may be a meaningless "max output" but this iNuke1000 bridged to 4 ohm mono driving a 15" small sealed sub is quite powerful.

For $200 I would choose this over comparably priced subwoofer "plate amps" any day of the week.

 

Tried this mod on my 3000. The standard fan is actually pretty quiet with the lid off. Once the lid goes on its intolerable....and this is with the amp cool. Once it warms up, the fan sounds like a wind tunnel!

My solution was to fit a 120R 2w resistor in series with the original fan. The fan is totally off until the amp warms up (5mins) & is now tolerable fully ramped.

On the 3000, there are flat heat sinks which will take adhesive fin heat dissipators.

 

I replaced the very noisy original fan with a Nexus Basic 80mm, cant hear a whisper from this as they claim " worlds quitest fan"!

The funny thing is that the Nexus fan looks exactly as the Behringer fan, same shape on chassie and fan blades.

regards, Jonas

 

Cant figure this out.......

The original fan itself is not that noisy with the top cover off. Once the cover is on, there is a resonance coming from the air as it is pulled thru the vents. The only way to quieten the fan is to reduce the air flow, which is what the resistor does.

Are you saying the Nexus fan achieves the same thing by spinning more slowly?

Also, the noise varies as the fan ramps up. With the resistor, the fan is actually off when you switch on & starts to spin as it warms up.

 

Maybe I've got hold of a particular noisy iNuke, as I can't enjoy the music with the amp located in the same room..I think that the Behringer fan has very cheap bearings, and that this bearing noise is
spreading to the fan shroud and top cover. The Nexus fan typically also rotates at lower speed, which in conjugate with superior bearings almost totally kills fan noise.

 

Did this fan mod. It is certainly much quieter than the stock fan as the fan is lower power, so acceptable in home environment. The fan in the top cover is quieter still, but alot more work.

 

Ok...I will give Nexus a try. The ones I see on ebay have 3 wires. Do you just connect 2?

 

Yes, connect black to black and red to red. Carefully cut away the yellow cable as close as possible to the fan motor. Keep in mind that I, due to neighbors, haven't run the iNuke at full level for any longer timespan with the Nexus fan, but this far there has been no problems, just very cool air emerging from the backside. I will not take responsibility for damages that can arise due to this modification!

 

I will not take responsibility for damages that can arise due to this modification!

Of course :nono:

Will let you know how fan compares to my resistor mod..........

 

hey guys

the inuke and special the dsp version is really intrested.
but the fan is not to accept in home cinema

a slower/silent version is critical under max load. (some people write on thomann.de and parts-express.com the amp was still quiet the job )

so i thin to a new "really" mod.

can we discuss if its really possible what i like to do?
1. using equal zalmann ZM-NBF47 (pc northbridge colling heat sink) on top of the mosfet
2. if it thermal perfectly we can change the heat pad under the heat sink with thermal adhesive grease (arctic silver)
3. change the fan to a silent 12-16db one

what do you think about it?

(and sorry for the bad english )

 

Agree....fan noise not acceptable in home environment.

Must point out this mod relates to my NU3000DSP

Problem I found is you cannot tell how loud fan is going to be until unit warms up & is giving maximum voltage to fan. My solution was to try several resistors & eventually settle on 120R.

Fan showing resistor:

You can use stock fan which does not spin until unit warms up, & then the speed is kept to an acceptable noise level.
I have also found blowing the air using the fan at the rear creates turbulence noise as the air passes through the front louvres.
So far, the quietest solution I have found is mounting the fan on top. altho the original fan with resistor is acceptable compromise. I had a piece of perspex lying around which I cut for this purpose. I have positioned the fan directly on top of the heat sensitive components:

and eliminated cowling of favour of adhesive heat sinks mounted to all the transistors.

Heatsink here:
http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1773319

In this way the air is draw through the top of the unit & expelled from the front & back which is much quieter. I have used a fan I had lying around for this experiment & the stock fan is left in position but not used.

 

Must point out this mod relates to my NU3000DSP

Ahh, this might explain some things! Can it be that NU3000 has variable fanspeed, while the NU1000
goes at full fan speed from start? (as my NU1000 does)

The specifications state that all three models have variable fanspeed, but my specimen certainly has not...

 

hey great!

i think the industrial fans including adda have a rough ball bearing. (rattle)
so the noiseblocker pro fans a extremly smooth.. but only 12V..

even I'm torn here between the Inuke 6000 and Thomann t.amp TA2400 MK-X (2x1200W @4ohm ring core >23KG)
so the weight is not my problem its mounted in a homecinema subwoofer.
the inuke 3000 have only 6xxW @4ohm ....

...

 

I think the issue is the speed of the fan creating turbulence through the front louvres, not the fan itself. The lower powered fans are quieter because they spin more slowly & dont get ramped up as much as the Behringer fan. But Behringer is trying to cool this thing during PA applications which is what it was designed for, so noise wasnt their main priority. In any case, you will hear the rushing air which makes a droning sound before you hear the fan itself.

 

ok i think the inuke is not for professional usw..
without heatsinks???

the modded version i much cooler then the original one. (and healthier for the amp live )

 

I put the heatsinks on because I cut the fan speed rotation....I am hoping it will compensate.
For professional use I guess the high speed fan works. The 3000 differs from the 1000 in having metal stand-offs which act as heatsinks, although they are not finned.

 

front:


back:

 

I must say that my iNukes has blown me away! Even the treble is quite acceptable!
I use it on full dipole speakers with four Peerless 12" sls bass drivers in a folded dipole, a Dayton RS-180 mid and a Neo3 treble per channel. One iNuke 1000 for the bass and one for mid and treble. Using Holm measurement program and a Panasonic wm-61 mic, I have achieved a very nice sounding frequency curve, using the built in DSP. My plan is to rebuild those speakers so that the eye (wife) also likes them, will send pictures when ready...

 

What is the exact size (diameter and thickness) of the stock fan in the iNuke 3000DSP and is it 12V or 24V?

 

is a 80mm standart 24V DC Fan.
thickness 25mm

i have tested the inuke 3000dsp today..
i send it back to the dealer this amp is really terrible

1. the DSP version is hissing after power up more then 40%..
2. the 2 channels are not really symmetrical... for 2 identical subwoofer i need on the first channel 100% power and on the second channel only 70% for the same loudness...

the amp is good for paper weight but not for hifi!

sorry

 

is a 80mm standart 24V DC Fan.
thickness 25mm

i have tested the inuke 3000dsp today..
i send it back to the dealer this amp is really terrible

1. the DSP version is hissing after power up more then 40%..
2. the 2 channels are not really symmetrical... for 2 identical subwoofer i need on the first channel 100% power and on the second channel only 70% for the same loudness...

the amp is good for paper weight but not for hifi!

sorry

The fan is 12v not 24v ?

I have a inuke3000 for both of my Dual Opposed sub builds ie one for each build and I think they are great.

Two Fi Q15's in a 120 L cabinet sealed and those inuke3000 drives them hard.

 

So is the fan 12V or 24V?