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ouragan66

Crown 2402

17 posts in this topic

fan noise is too loud !!

In operation manual I found this :

5.3.2 cooling fan options :

Macro-tech amplifier has a high velocity fan.

There is a optional replacement fan is Crown part C 6594-3

is a quieter low velocity fan .

is available?

thanks

Stefano

ps

my 2402 is 220 v version

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Hi

the price of replacement fan Crown part C 6594-3 is approximately $ 3-4 ,

I think it's just the plastic fan...

then does not change the fan speed,

but only a plastic fan profile less noisy..

it is corrected?

thanks

Stefano

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Reducing the fan voltage will reduce the amp's heat dissapation capability and may result in decreased performance.

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Reducing the fan voltage will reduce the amp's heat dissapation capability and may result in decreased performance.

but only use at home,sub reflex with 21"-100db-1w-1mt-4 ohm nominal, the max power is 100-200 watt to 4 ohm is possible reduce the fan voltage ?

and how?

with a simple resistor or a resistive divider?

thanks

Stefano

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The fan in this amp also serves as the low-voltage transformer, so I don't think modifying it is a good idea.

what could be the solution to reduce the fan noise?

just change the original high velocity fan with the low velocity fan ? (I ordered the low velocity fan Crown part C 6594-3...)

ps

why call the fan C 6594-3 "low velocity fan" if the speed of rotation does not change?

thanks

Stefano

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The fan in this amp also serves as the low-voltage transformer, so I don't think modifying it is a good idea.

what could be the solution to reduce the fan noise?

just change the original high velocity fan with the low velocity fan ? (I ordered the low velocity fan Crown part C 6594-3...)

ps

why call the fan C 6594-3 "low velocity fan" if the speed of rotation does not change?

thanks

Stefano

Velocity mean speed, so if you have a low velocity fan by changing the pitch of the blade for the same rotational speed you will have lower speed air moving ;)

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the low velocity fan Crown part C 6594-3 mounted :

sysg1s.jpg

the noise is decreased to 71-72 db to 56-57 db...

now no longer hear the fan noise...

but now hear the noise of power transformers !!!!

However now the 2402 is suitable for home use..

ciao everyone and thanks at Kevin Heber :)

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It happened the same to me!

I changed the noisy fan, and trasformers buzz emerged...

Still not really suitable in hi-fi use, unfortunately :(

Is there a solution, Crown?

Thanks

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As Kevin mentioned, changing the fan blade has now caused other artefacts to show up, transformer, shaft (rotor) noise and such. You may also have noticed some low sounding crackling coming form the output sections. The transformer noise you are hearing is more probably the rotor's out of tolerance bearings and shaft. You could clean and refurbish the bearings and shaft.

What I tend to do these days, because the original fanmotor is not available any more (please confirm, Kevin?), I will order the current default fanmotor (for the CT amp, without the low voltage transformer) and swap internal components with the problematic fanmotor : Replace bearing assemblies and shaft and reinstall refurbished fanmotor.

I hope this helps!

A.

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