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Discussion Starter #1
I think I saw another post somewhere, about how a member had replaced the fan on his MMATS amp.
As I recall, he used a Noctua fan (which might be better than the one I used - time will tell).

At any rate, I figured I'd give a step-by-step on how to replace the fan in a MMATS amp.
I did both my MMATS amps, and the whole process took about 20 minutes (10 mins per amp).

First of all, here is the link to buying the fan:

Noctua Fan:
https://www.amazon.com/Noctua-Cooling-Blades-Bearing-NF-A4x10/dp/B009NQLT0M/ref=pd_ybh_a_2?_encoding=UTF8&psc=1&refRID=2KA3729BP34C3MXB5MPG

Here's what I ended-up using:
https://www.amazon.com/2-packs-0-10A-Brushless-Cooling-AV-F4010MB/dp/B01GPEQZ8A/ref=pd_ybh_a_2?_encoding=UTF8&psc=1&refRID=1EZVYQ7GVEDR15Y18498


First, you need to remove the top plate from the amp, by unscrewing the 4 allen bolts at each corner:


Here's a 'guts shot' of the MMATS HiFi-6150. It's a stout little beast.
They maximized real estate by mounting the PC boards upright (kinda like what Mosconi does).


MMATS uses Fujicon capacitors. Not the best, but far from the worst. Comparable to Nichicon.



Here's the offender... his days are over.


Remove the 2-pin connector for the fan. Remember which way the plug is positioned. (if you forget, then I've detailed it below)


Carefully cut the top edge of the fan. It is glued to the amp chassis with silicone.


After cutting it, I got in there with a very small flat screwdriver and pried it away from the chassis.
Then just pull it away, and clean the silicone from the amp chassis.


Then apply some glue (or silicone) to the four corners of the new fan.
I used Gorilla glue. Notice I got a drop on the fan blade... fffaaaa! I cleaned that off before installing it.


Then just press it back into place. I also added a drop of Krazy Glue, to quickly hold it there, while the Gorilla Glue dried.


Note: when putting the new fan in; the connector should have the white plastic facing the SCR chip (right beside the pins on the PC board).


The other side of the connector has two exposed metal pieces. This faces away from the SCR.
 

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Nice write-up....

That said, I would seriously recommend against using gorilla glue as the adhesive for the new fan!!!

Not only will the silicone add a bit of physical vibration damping between the fan and amp chassis, but also, in case the new fan ever goes belly up, it will be nearly impossible to remove and replace it if it is glued to the amp with gorilla glue!!!

Simply use a silicone caulk just like MMATS did.

Just my .02
 

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Discussion Starter #3
Nice write-up....

That said, I would seriously recommend against using gorilla glue as the adhesive for the new fan!!!

Not only will the silicone add a bit of physical vibration damping between the fan and amp chassis, but also, in case the new fan ever goes belly up, it will be nearly impossible to remove and replace it if it is glued to the amp with gorilla glue!!!

Simply use a silicone caulk just like MMATS did.

Just my .02
I get what you're saying, with regards to the damping potential of silicone... but this fan is so small, I doubt there's much vibration potential there.
With that said; if I ever do it again, I'll take your advice and use silicone.

Removing the Gorilla Glue isn't an issue.
Those couple drops I got on the fan blade was keepig me awake at night, so this morning I pulled the amp apart and ripped the fan out, and replaced it with a new one.
It came out just as easy as the silicone. OK... maybe the silicone was a bit easier, but it was a fairly easy razor knife process to remove the Gorilla Glue.
 

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Weird my post is gone?

I originally asked if there was an issue with the stock fan and if it would be heard inside a regular cab truck? I also said that mmats should include a better fan at their price point assuming the production costs are inline with that.

EDIT: never mind I’m an idiot. My question is on CAJ, lol.
 

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I think I saw another post somewhere, about how a member had replaced the fan on his MMATS amp.
As I recall, he used a Noctua fan (which might be better than the one I used - time will tell).

At any rate, I figured I'd give a step-by-step on how to replace the fan in a MMATS amp.
I did both my MMATS amps, and the whole process took about 20 minutes (10 mins per amp).

First of all, here is the link to buying the fan:

]
Very cool, man! Thanks for this! I don't think I'll have an issue with mine in the trunk of the Jeep, but it's a great guide if I do...
 

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Weird my post is gone?

I originally asked if there was an issue with the stock fan and if it would be heard inside a regular cab truck? I also said that mmats should include a better fan at their price point assuming the production costs are inline with that.

EDIT: never mind I’m an idiot. My question is on CAJ, lol.
Based on my reading, I’ve seen at least one complain about the fan noise in a truck and another one with a truck that said the fan wasn’t an issue.
 

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Discussion Starter #7
When the amp is new, the fan is dead silent (maybe a whisper).
But after about 6 months, they seem to get unbalanced or something, and they are loud as heck.

I also have my amps in the trunk, so I never heard it (until I opened the trunk).
However, just knowing it was making noise annoyed me... so I replaced them.
 

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When the amp is new, the fan is dead silent (maybe a whisper).
But after about 6 months, they seem to get unbalanced or something, and they are loud as heck.

I also have my amps in the trunk, so I never heard it (until I opened the trunk).
However, just knowing it was making noise annoyed me... so I replaced them.
White noise. It helps me sleep better. :p
 

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Let me guess, you spent so much money on your vehicles that the wife found out and now you have to sleep in that vehicle because now she is :mad:

:laugh: ;)
Lmao!

That's where "we" sleep after the 3way... ;)
 

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Excellent tutorial jimmydee! Much clearer than the post I did. The reason I recommended the Noctua fan is because of its specs. It is quieter, moves more air, and uses less current than other options.

Ambeyond fan:
Acoustic Noise: 27
Air Flow: 6.86CFM
Current: 0.10A

Noctua fan:
Acoustic Noise: 17.9
Air Flow: 8.2CFM
Current: 0.05A
 

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Nice. I thought about replacing the fan in mine but it's in the trunk and I can only hear it if no music is playing after I shut the car down for the 5 seconds or so before it turns off the amps. Maybe one day I'll do it anyway.
 

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Are the Noctua fans available in black, too, or just the brown?
 

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I’m wondering why MMats just doesn’t put a quieter fan in their $1000 amps.
I’ll be buying one or 2 down the road and mention it to David .
Nothing to loose .
 

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So it looks like they need to be 2 pin and 40x10mm, but the Noctua link is showing a 3 pin. Am I misunderstanding something?
 

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It comes with a 3 to 2 pin adapter.

Noctua Website:
3 to 2-pin Adaptor and Polarity Protection:
The NF-A4x10 comes with an adaptor from 3-pin Molex to the 2-pin connectors used on many graphics cards or network and storage devices. An integrated diode provides polarity protection on 2-pin connections.
 

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It comes with a 3 to 2 pin adapter.

Noctua Website:
I just saw thought in the Amz description too. Thanks!
-Low-Noise Adaptor (L.N.A.)
-3:2 Pin Adaptor
-OmniJoin Adaptor Set
-30cm Extension Cable
-4 Vibration-Compensators
-4 Fan Screws

Then there's that 70s brown color... :eek: Lol
 

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Discussion Starter #20
Then there's that 70s brown color... :eek: Lol
The brown color is hideous... but you'll likely never see it.
Just get the Noctua fans, and have that piece of mind knowing you'll never hear them.
 
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