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Crown 2402


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#1 ouragan66

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Posted 23 October 2010 - 04:29 AM

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

#2 Kevin Heber

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Posted 25 October 2010 - 01:19 PM

Yep.  Order directly from Crown parts.

#3 ouragan66

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Posted 26 October 2010 - 04:12 AM

QUOTE(Kevin Heber @ Oct 25 2010, 08:19 PM) View Post
Yep.  Order directly from Crown parts.


thanks
Stefano

#4 ouragan66

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Posted 26 October 2010 - 10:47 AM

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



#5 Kevin Heber

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Posted 03 November 2010 - 07:43 AM

Yes, correct.

#6 ouragan66

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Posted 03 November 2010 - 07:58 AM

QUOTE(Kevin Heber @ Nov 3 2010, 02:43 PM) View Post
Yes, correct.


the alternative or in addition  is attenuating the tension that arrives to the fan ?

thanks
Stefano


#7 Kevin Heber

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Posted 03 November 2010 - 08:59 AM

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

#8 ouragan66

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Posted 03 November 2010 - 09:24 AM

QUOTE(Kevin Heber @ Nov 3 2010, 02:59 PM) View Post
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

#9 Kevin Heber

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Posted 03 November 2010 - 12:52 PM

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

#10 ouragan66

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Posted 03 November 2010 - 05:16 PM

QUOTE(Kevin Heber @ Nov 3 2010, 06:52 PM) View Post
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




#11 Stephane

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Posted 03 November 2010 - 05:34 PM

QUOTE(ouragan66 @ Nov 3 2010, 06:16 PM) View Post
QUOTE(Kevin Heber @ Nov 3 2010, 06:52 PM) View Post
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  wink.gif

#12 Kevin Heber

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Posted 04 November 2010 - 01:13 PM

I agree that it is confusing, but yes, only the fan blades are different.

#13 ouragan66

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Posted 06 November 2010 - 04:26 AM

The fan arrived...



#14 ouragan66

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Posted 06 November 2010 - 04:33 AM

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




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  smile.gif