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I always have stated I didn't hear it but since a few days I hear it harder as before ... is that possible or is there a reason for it?

Just somewhat related to this topic:

I ended up putting a 80mm fan in my kronos...blows like crazy so I assume it is cooling sufficiently.
However, the casing just to the right of the power plug still grows very warm within half and hour.
I don't have equipment to take measurements, but does this sound normal?

Maybe I've stated this before, but just for the record:

I replaced the Korg stock metal screws that hold the fan with rubber ones, and it's a world of difference! I haven't measured the noise, but it feels as if it's 80% less noise. (My K73 sounded like a tractor until I replaced the screws..)

My suggestion is to try this cheap and easy fix before replacing the fan with other brands and thereby avoiding the risk of insufficient airflow.

I have no problem with the noise the fan is making now, it's inaudible even at moderate playing levels.

Okay,

The factory fan seems to be a

Quick Flow DC Series - RDM6025S
----------------------------------------
Bearing System = Sleeve
VDC = 12V (6V startup)
Rated Current = 0.10A
Speed = 3000rpm
Air Flow = 14.10CFM (0.399CMM)
Static Pressure = 2.42
Noise Level = 22.71 dBA
Weight = 62g

Okay, if you look at

NoiseBlocker BlackSilentFan XR2
--------------------------------------
Bearing System = Sleeve
VDC = 12V (4,5V~6.0V startup)
Rated Current = 0.075A
Speed = 2200rpm
Air Flow = 14.13CFM (0.400CMM)
Static Pressure = ?
Noise Level = 15 dBA
Weight = 60g

So, this fan IS THE PERFECT SUBSTITUTE !!!

phenaste wrote:Okay,So, this fan IS THE PERFECT SUBSTITUTE !!!

If you read the whole thread, you will learn that the specs of any given fan (as stated by the respective manufacturer) don't always tell the truth..

Be careful not to replace th stock fan with one that doesn't provide the necessary air flow.

But (as has been noted previously on this and other fan threads) the Noiseblocker does meet its specs, and is definitely the replacement to use...

df

If you read the whole thread, you will learn that the specs of any given fan (as stated by the respective manufacturer) don't always tell the truth..

Be careful not to replace th stock fan with one that doesn't provide the necessary air flow.

Ok. If you have to choose between to brands :
On one hand Quick Flow with its specs & NoiseBlocker on the other with it specs. Which brand will YOU choose ?!!
=> Probably the well-known and proven german quality build of NoiseBlocker.

Now, if you're the manufacturer of the Kronos and you have to choose between the two brands ?
=> The cheapest !!! => Quick Flow

That's it.

More over, Quick Flow stock fan state 22.71 dBA. Don't care and admit it says the truth.
NoiseBlocker state 15 dBA !!! Do you think that a well-known fan builder such as NoiseBlocker would modified its measure so much that the final result based on the same protocol of noise level measurement will produce a much louder fan that the stock one ?!!?

Notice that there's more than 7dBA gap and speed is logically slower !!!
Except noise level, all other specs are easily and physically measurable. So Air Flow 14.13cfm is in the same range.

Don't forget the theme of this post. This post aims users that want a fix their noisy fan !

Some users were not sure about the air flow. The NoiseBlocker BlackSilentFan XR2 meets all needed requirements.
That why I state that it is the perfect substitute of the stock fan.

Aribo,

Are you currently using the Noiseblocker NB-BlackSilentFan XR2, or something else?

Are you done with your experiments, or are you still searching for a new solution?

Thanks,

David

I have replaced the original fan with the noiseblocker, and I can only say that in direct comparison to the noiseblocker the bulit in fan looked like a piece of cheap crap to me, when I saw both side by side.

Everything is fine now since several months with the noiseblocker, which has identical airflow and is running sigificantly calmer (and running at slower speed) than the old one. I have tested leaving the Kronos switched on overnight with the noiseblocker, without any heating beyond what was there before, and without problems.

jimknopf wrote:I have replaced the original fan with the noiseblocker, and I can only say that in direct comparison to the noiseblocker the bulit in fan looked like a piece of cheap crap to me, when I saw both side by side.

Everything is fine now since several months with the noiseblocker, which has identical airflow and is running sigificantly calmer (and running at slower speed) than the old one. I have tested leaving the Kronos switched on overnight with the noiseblocker, without any heating beyond what was there before, and without problems.

Great news Jim!

I've had a Noisblocker sitting on my desk for a few months now, not sure if I should pop it in or not. But now I feel confident about it.

I am going to bring my K73 to my retailer today, to have the note cut-off issue fixed, and when it returns I'll mount the Noiseblocker.

Jim,

Regarding the noise blocker fan, are you noticing the slight hum Aribo mentioned? In reviewing the thread, he wasn't sure if his noise blocker arrived damaged.

Thanks,

David

The noiseblocker is not completely silent, but has a very small hum. On the upside it provides enough air flow to be safe.

In sharp contrast to the original fan, which disturbed me all the time, I don't take notice of the noiseblocker fan during play. That's all I wanted.

Thanks Jim.

A man from Korg has explained to me that the speed (and so the noise) of the fan is directly related to the temperature of the motherboard which is directly related to the place where the kronos is. So the cooler is the place the more silent is the fan

Hi,

I planned to write a review of my current solution, but didn't find time to do so, so I copy part of a private message to davidnaggar to this thread:


davidnaggar wrote:

Are you currently using the Noiseblocker NB-BlackSilentFan XR2, or something else?
Are you done with your experiments, or are you still searching for a new solution?

may be, I am currently pausing my activities around the fan, because it works well enough for me now and I have a lot other things to do.

I hope to find some time during the week to add some more posts to the thread, as I see it's going on there.
I also have a few images of my current fan configuration.

Just for a quick information:

I currently have a Splitter cable conected to the motherboard, one connected to a SilenX which is attached to the Motherboard cooler.
The other one is the Noiseblocker mounted in the stock fan's position but with it's blue rubber mounts. I didn't fix them as they are designed but more loose, so the decoupling is much better. I reduced the speed of the Noiseblocker with a "fan mate".

This two fan solution works ok for me.

The SilenX fit's here, because there is not much demand for air throughput. There may be better fans and also cheaper ones. On the other hand this position on the motherboard cooler is not well decoupled, so it needs a very quiet and non-vibrating fan.

Have a nice day...