Need to replace a 24v fan... Use 2 12v fans? - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 
Thread Tools
post #1 of 11 Old 03-29-2008, 04:35 PM - Thread Starter
Member
 
zero-R's Avatar
 
Join Date: Apr 2003
Location: Austin, TX
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I recently purchased an SKP pro audio amp and the fan is noooooisy (shocker I know...). I gutted the fan out and its a 92mm 24v fan. Took a trip to the local Fry's and of course, no 24v fans. Went online and all the fans I saw were on the order of 30 db+ minimum for 92mm. Is 30db quiet enough? Or is that roughly what it sounds like now?

My question is, can I buy 2 12v 60mm fans and wire them up in series (so in theory they see 12V each)? I saw a few 60mm fans that were around 11 db so I figure 2 of them together would still be a vast improvement over the vacuum cleaner I have roaring now.

Got $$?
zero-R is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 03-29-2008, 04:40 PM
AVS Forum Special Member
 
DonoMan's Avatar
 
Join Date: Feb 2005
Location: Massachusetts
Posts: 4,104
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 254 Post(s)
Liked: 197
30dB isn't super quiet for a fan but it's not a Vantec Tornado by any means. You can wire up 12v fans in series, yes, or you can use a properly sized resistor to sink some of the extra voltage.
DonoMan is offline  
post #3 of 11 Old 03-29-2008, 07:32 PM
AVS Forum Special Member
 
Looneybomber's Avatar
 
Join Date: Sep 2006
Location: Lawrence, KS
Posts: 4,645
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 29
I put 2, 80mm fans in my EP2500. Each were 14db fans, which helped cut the noise drastically! Check computer stores online if they have any quiet 92mm fans, otherwise I'd go for the 80's

YID DIY
Looneybomber is offline  
Sponsored Links
Advertisement
 
post #4 of 11 Old 03-30-2008, 05:45 PM
AVS Forum Special Member
 
JBJR's Avatar
 
Join Date: Jul 2000
Location: Lancaster, PA
Posts: 1,123
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 10
You need to find out how much air you need to move and then go from there. You can order 24v fans from Mouser or Digikey. Get one that moves more air than the stock fan and then put a 15v voltage regulator in line. that will lower the speed of the fan and still move enough air and be make it much more quiet.
JBJR is offline  
post #5 of 11 Old 04-11-2008, 06:16 PM
Advanced Member
 
Nordo's Avatar
 
Join Date: Feb 2004
Location: Noosa,Australia
Posts: 865
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked: 40
Quote:
Originally Posted by Looneybomber View Post

I put 2, 80mm fans in my EP2500. Each were 14db fans, which helped cut the noise drastically! Check computer stores online if they have any quiet 92mm fans, otherwise I'd go for the 80's

I assume your saying you used two 12v fans wired in series.
Where did you put them?
Did you stack them in series where the old one was, or did you put the second one somewhere else?
I'm waiting for my EP2500 to arrive, and this will be the first mod I do.
Nordo is offline  
post #6 of 11 Old 04-11-2008, 06:55 PM - Thread Starter
Member
 
zero-R's Avatar
 
Join Date: Apr 2003
Location: Austin, TX
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I went with two 12V 80mm fans rated at 11 db (or 9 db, whatever it is, I can't hear it) and just put both on top of the heat sink, side by side (not stacked on top of each other). My amp has yet to get hot at all.

Got $$?
zero-R is offline  
post #7 of 11 Old 04-11-2008, 08:12 PM
AVS Forum Special Member
 
Looneybomber's Avatar
 
Join Date: Sep 2006
Location: Lawrence, KS
Posts: 4,645
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 29
Quote:
Originally Posted by Nordo View Post

I assume your saying you used two 12v fans wired in series.
Where did you put them?
Did you stack them in series where the old one was, or did you put the second one somewhere else?
I'm waiting for my EP2500 to arrive, and this will be the first mod I do.

I should have taken pictures. There's a guy on HTS that wants pics too.
Both fans are in series and piggybacked where the existing fan went. One fan goes outside the shrowd in the existing location, one goes inside. Doing that, you have to route 4-5 wires up over the heatsink because of a lack of clearence under the shrowd where all the wires originally ran.

YID DIY
Looneybomber is offline  
post #8 of 11 Old 04-12-2008, 12:15 AM
Advanced Member
 
Nordo's Avatar
 
Join Date: Feb 2004
Location: Noosa,Australia
Posts: 865
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked: 40
Quote:
Originally Posted by Looneybomber View Post

I should have taken pictures. There's a guy on HTS that wants pics too.
Both fans are in series and piggybacked where the existing fan went. One fan goes outside the shrowd in the existing location, one goes inside. Doing that, you have to route 4-5 wires up over the heatsink because of a lack of clearence under the shrowd where all the wires originally ran.

Thanks, I thought that would be the way to go.
I'll now go ahead and buy a 5-pack of fans, as I want to put some on top of my Onkyo 805.
What were the 14dB fans you used?
Nordo is offline  
post #9 of 11 Old 04-12-2008, 07:02 AM
AVS Forum Special Member
 
Looneybomber's Avatar
 
Join Date: Sep 2006
Location: Lawrence, KS
Posts: 4,645
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 29
http://www.enermaxusa.com/catalog/pr...roducts_id=102
I saw them for sale some place for like 7 bucks. I bought mine at Tiger Direct (before I saw them someplace cheaper) for around 11.00, but they no longer carry them.

YID DIY
Looneybomber is offline  
post #10 of 11 Old 04-12-2008, 07:06 PM
Advanced Member
 
Nordo's Avatar
 
Join Date: Feb 2004
Location: Noosa,Australia
Posts: 865
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 64 Post(s)
Liked: 40
I got impatient, so I ordered 5 fans last night.

I hunted around a bit and ended up with Glacialtech SilentBlade GT8025EDL-A1.
They were $5.00au each.
They are rated at 26.3cfm at 18dB.
They're not as quiet as the Enermaxs, which are rated at 14dB.

I tried for the Enermaxs, but we don't have them here in Australia, and I couldn't be bothered ordering from overseas. The shipping would cost more than the fans.
As it was, I had to pay $12.40 for postage, which was the cheapest and slowest that was offered.

Thanks for all the help.
Nordo is offline  
post #11 of 11 Old 04-13-2008, 08:06 AM
Senior Member
 
fperra's Avatar
 
Join Date: Dec 2005
Location: Tacoma, WA USA
Posts: 257
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
Liked: 71
I replaced all the 24 volt fans in my 6 QSC amps with quiet 12 volt fans. I dropped the 24 volts to 12 using a 3 pin IC regulator in series with the original 24 volts.
fperra is offline  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off