Quieter Fan Mod for Behringer EP2500 - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 206 Old 03-02-07, 09:47 AM
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Re: Quieter fan mod for Behringer EP2500

I think he had his ON and didn't realize it.
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post #22 of 206 Old 03-02-07, 12:49 PM Thread Starter
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Re: Quieter fan mod for Behringer EP2500

Dogh! I've been worrrying about that gap!



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post #23 of 206 Old 03-02-07, 02:36 PM
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Re: Quieter fan mod for Behringer EP2500

i can confirm its the same on the ep1500, i think i put in papst fans, same process.

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post #24 of 206 Old 03-05-07, 10:26 PM
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Re: Quieter fan mod for Behringer EP2500

Ok, i did the fan mod as well using the fan out of a computer psu. These fans are traditionally extremely quiet so i figured it would be a good place to start. The fan fit perfectly in place of the original fan, so no ninja rigging was required. I also used 2x 390 ohm resistors in parallel to make 195 ohms placed in-line with the (+) wire to the fan. The reason for running them in parallel is because they are smaller and i needed to get more to handle the heat dissipation. I realize this isnt exactly right, but the amount of air being moved and the lack of noise being generated is nice. Also, when I turned it on the first time, I had to check because I didnt think it was plugged in correctly
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post #25 of 206 Old 03-05-07, 11:06 PM
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Re: Quieter fan mod for Behringer EP2500

I tend to have bizarre ideas, and this isn't an exception;

In looking at the pictures of the amp, the shroud appears to be the ~ same thickness as the fan, and 24v is half of a standard computer fan's voltage. So why not stack two quiet computer fans connected in series?

You might get a little more air flow and get around the problem of finding a 24v fan.

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post #26 of 206 Old 03-06-07, 10:19 AM
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Re: Quieter fan mod for Behringer EP2500

Interesting idea... Ill give it a try if my rti12s overwork the amp... (unlikely).
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post #27 of 206 Old 03-07-07, 10:19 AM
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Re: Quieter fan mod for Behringer EP2500

Quote:
Ok, i did the fan mod as well using the fan out of a computer psu. These fans are traditionally extremely quiet so i figured it would be a good place to start. The fan fit perfectly in place of the original fan, so no ninja rigging was required. I also used 2x 390 ohm resistors in parallel to make 195 ohms placed in-line with the (+) wire to the fan. The reason for running them in parallel is because they are smaller and i needed to get more to handle the heat dissipation.
But aren't computer fans 12 volts? The supply for the fan in your EP2500 is 24 volts? So, you would be at least dropping 12 volts across the 190 ohm resistors? That would dissipate about 3/4 watts steady state. So, two 1/2 watt resistors would be fine in a passive circuit, but a fan is a variable current device depending on its load.

Start up current requirements, or if the fan fails to start would place much more than 12 volts across your resistors. Start up or stall load of a DC fan is at least twice the steady state requirement. Hopefully you've spec'd the resistors wattage to accomodate this added dissipation requirement? Stop the fan with your hand and put your fingers on the resistors for a while and see if they are about to burn up......

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post #28 of 206 Old 04-10-07, 08:59 PM
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Re: Quieter fan mod for Behringer EP2500

New information on Fan Acquisition...

Digikey.com had a wait time for ship till 10 May which eludes to "none in stock"...

After some research I found them at www.newark.com

under the part number

NMB FBA08A24L1A which is also the part number of the manufacturer.

Price was 8.71usd each and there are many in stock.

Hope this help anyone looking

Thanks
Dan
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post #29 of 206 Old 04-10-07, 09:01 PM
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Re: Quieter fan mod for Behringer EP2500

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bigguy wrote: View Post
Price was 8.71usd each and there are many in stock.
My bad... 7.75 each... what was I thinking
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post #30 of 206 Old 04-10-07, 09:04 PM
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Re: Quieter fan mod for Behringer EP2500

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bigguy wrote: View Post
My bad... 7.75 each... what was I thinking
Part Number 31K9990 at www.newark.com

There Sorry for the errors... I was looking at the wrong display when I grabbed the information... too many computers at one desk... 5 computers and 4 screens... bet you cant guess what I do for a living...?
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