Putting fans in...

[Echo42987 10+ year member]

Alright so for my new enclosure I'm building a wall over my amps and then putting plexi glass so you can see through w/ some lighting. Well I wanted to put some fans in there as well to keep them cool. I have a battery in my trunk and was curious can I just wire positive to positive, etc. Or will the fans be running all the time then? How do I make it so they only run when the car turns on. I have a remote line from my Head unit ran to the back of my car.

Any help would be greatly appreciated as I'm a little confused. If you guys find something I need shoot me a link if ya can.

These are the fans I was thinking about putting back there...

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3976148&CatId=803

I was thinking 2 of those per amp. So 4 all together.

Click to read more...

 

[KyleBechtold 5,000+ posts]

run the power of the fans to the remote the ground to the ground on the amp..

 

[Crzy 10+ year member]

use a relay in conjunction with ur amp turnon. then run all the amp turn on and fans off of the relay

this will make it so the fans only kick on when the car is on

you need a relay or else it will fry the amp turnon i think due to too much power being pulled, especially if you are running more than one amp

 

[Echo42987 10+ year member]

So from the Remote line on the HU run it to a relay and then distribute it from there. Is there a certain relay I should be looking at?

 

[gunz4me 10+ year member]

You could also use a thermal control unit to kick on when the temperature reaches a certain level, but that is kind of overkill. As the poster above me said, DO NOT run your fans without using a relay unless you want to watch your remote output go poof!

Also, if you find you have noise from your fans, you can try wiring their power through the low pass section of a passive crossover. I was looking to build a noise rejection circuit when one of my electrical engineer buddies just told me to use the low pass outs on a passive crossover that I wasn't using since it has all the basic parts needed for a noise rejection circuit.

 

[dman4486 5,000+ posts]

So from the Remote line on the HU run it to a relay and then distribute it from there. Is there a certain relay I should be looking at?

you can get any relay from an autoparts store that would work.

use the amp turn on to switch the relay and run power from your B+ line on the amp

assuming you know how a relay works

 

[gunz4me 10+ year member]

So from the Remote line on the HU run it to a relay and then distribute it from there. Is there a certain relay I should be looking at?

Something like **THIS** will do

 

[Echo42987 10+ year member]

You could also use a thermal control unit to kick on when the temperature reaches a certain level, but that is kind of overkill. As the poster above me said, DO NOT run your fans without using a relay unless you want to watch your remote output go poof!
Also, if you find you have noise from your fans, you can try wiring their power through the low pass section of a passive crossover. I was looking to build a noise rejection circuit when one of my electrical engineer buddies just told me to use the low pass outs on a passive crossover that I wasn't using since it has all the basic parts needed for a noise rejection circuit.

The first part you mentioned does seem over kill lol //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The second part through seems like if I run into that problem then I'll do what you suggested.

 

[Echo42987 10+ year member]

Something like **THIS** will do

All together I'll be running 6 lines off of this then...?

I have two amps and 4 fans that I'll be hooking up. That relay only has 2 outs...Are there ones w/ multiple outs?

 

[Echo42987 10+ year member]

you can get any relay from an autoparts store that would work.
use the amp turn on to switch the relay and run power from your B+ line on the amp

assuming you know how a relay works

As I've never used one before...lets assume no //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[audioholic 5,000+ posts]

And before you even consider it... no, do not run a push-pull configuration with multiple fans. Have them all push, or all pull, with 'dead holes' on the other side of the enclosure of approx the same area as the fan(s). Push-pull is highly popular, yet grossly inefficient for that application.

 

[audioholic 5,000+ posts]

All together I'll be running 6 lines off of this then...?
I have two amps and 4 fans that I'll be hooking up. That relay only has 2 outs...Are there ones w/ multiple outs?

There is no reason you cant run multiple wires/fans off of a single output.

 

[Echo42987 10+ year member]

There is no reason you cant run multiple wires/fans off of a single output.

I would assume that but wasn't sure if it would be overkill as they were saying before if I just run multiple off of the one from the HU it'll blow it...

 

[dman4486 5,000+ posts]

As I've never used one before...lets assume no //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

http://electronics.howstuffworks.com/relay.htm

as long as you do not exceed the relay's rating (amps) then you can run as many fans on one circuit as you would like.

 

[Echo42987 10+ year member]

And before you even consider it... no, do not run a push-pull configuration with multiple fans. Have them all push, or all pull, with 'dead holes' on the other side of the enclosure of approx the same area as the fan(s). Push-pull is highly popular, yet grossly inefficient for that application.

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