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  Topic Review (Newest First)
09-10-17 12:11 PM
fusseli
iNuke Fan Swap and DIY 12v trigger

I replaced my upgraded fan the other day, it was an Arctic Cooling F8. The bearings were starting to wear out and a droning noise was getting louder. Not bad but I knew what the cause was. I used to leave my nu3000 on 24/7, before my 12v trigger mod, the fan life was pretty good considering it was about three years of being on 24/7 continuous. For a replacement I used a Noctua NF-R8 Redux. I think Noctua makes the nicest 12v fans around.

Here's a pic of my 12v trigger relay to turn the inuke on and off with the AVR, before taping it up to cover the connections and support the wires. My old Onkyo 818 didn't have 12v trigger but my new Denon X3300W does. The 20amp 12V relay was I think all of $8 on Amazon and the rest of it was spare cords and parts I had laying around. Works like a charm and my living room no longer has an orange night light from the inuke
01-12-17 10:44 AM
fixthedoor
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

Another successful fan swap on a NU3000DSP. I've had my iNuke for 2 years and finally got around to this mod. I couldn't be happier. A Noctua NF-R8 redux-1800 is what I used and for all intents and purposes it's silent. The connector on the NF-R8 was loose when I attached it to the board so I removed it and used the stock connector. Well worth the $10 and 1 hour of labor.
03-18-16 06:15 PM
funkingitup
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

I have racked up a little over a year of daily use with zero problems from the 140mm top-mount mod. Has anyone hit 2 or 3 years with their Noctua mods? It's great to hear how they hold up.
02-19-16 10:40 AM
Mirage_Man
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

Just received an NU3000DSP yesterday. Plugged it in and turned it on. Sounded like a vacuum cleaner LOL. I just got done swapping the stock fan out with a Noctua NF-A8 FLX. Wow, what a difference. Highly recommenced. I also added the aluminum heat sinks as shown in prior posts. Took me all of 30 mins to do the entire mod.
01-22-16 05:16 PM
daddieo
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

Just popped the top on my new 3000 and the fan was installed to blow in and this seemed a bit odd to me what with the shroud set-up. If doing a fan swap and removing the shroud, along with heat-sinks, would it not be better to have the fan exhaust the heat rather than just move the heat around???
01-09-16 08:54 PM
rselby
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

has anyone placed sound deadener( dynamat type stuff ) on the fan shroud....seems to me that this will add mass to the flimsy thin plastic fan shroud and combat the resonance ( and sound ) ....just a thought...but the fans do sound like a plane taking off when they are on full speedc
10-08-15 02:48 PM
cajun_duck
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

I was thinking of doing what funkingitup did with his 3000 to my 1000 non DSP once it came in. Just get rid of shroud and put a big fan on top blowing out.
03-01-15 12:20 PM
giskard
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

BTW I like funkingitup's solution up there.

Is the fan in the original location, a quieter upgraded one?
03-01-15 12:16 PM
giskard
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

BTW the SMPS in the NU-1000 is a very simple "open loop" (unregulated) half-bridge topology. Its output voltage changes with AC input voltage and load. Because (as all offline power supplies are), it is fed with a bridge and capacitors, which shows 120 Hz ripple under load, the power supply output rails show 120 Hz ripple under load and significant drooping. This will increase THD+N in the amp outputs, especially one with (presumably) low gain (and thus low "PSRR" (power supply rejection ratio)). I took a quick look at the output with a scope, while driving an 8 ohm resistor, didn't see anything untoward with the scope's FFT function. I was tempted to look at it with our Audio Precision 2 at work, but yesterday's hackfest had to come to an end.

I imagined building a regulated LLC (resonant) power supply for it (my area of expertise in my day job), that would not only not droop under load, providing greater peak power, but would also have greatly reduced 120 Hz ripple to reduce power supply induced THD+N. I built a prototype once for an audio customer and demonstrated said reduction.

However, when I cranked it up, I disabused myself of that notion because I probably won't hear the difference. It would also defeat the idea of buying a $200 PnP "1 kW" amp with DSP.

P.S. Does is there an other-than-fan hacking thread for these amps for me to copy the above?
03-01-15 12:04 PM
giskard
Re: Behringer iNuke NU1000 Amp Amplifier Fan Swap How To w/ PICS

Quote:
fschris wrote: View Post
that is impressive.... i wonder if this would be safe on a inuke 3000!
Measure the fan voltage when it's stone cold, and let me know. The circuit may need to be modified if the 3000 has a different minimum voltage.
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