Home sub in a car? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd December 2008, 12:27 AM   #1
banshee is offline banshee  United States
diyAudio Member
 
Join Date: Dec 2008
Default Home sub in a car?

So my brother went off to college and left me his old sub from his stereo system in his room. I was wondering if it would be possible to use this in my car. The sub is powered by a wall plug and im able to wire it directly to my ipod. I can plug my ipod into my cars aux jack so with a headphone splitter i can connect my sub and my cars audio to my ipod at the same time (at least i think i can...correct me if im wrong). So in my mind the only problem is power...can i use a ac-dc converter to power it or would that drain my battery? is there anyway to get this to work without doing any serious wiring, as i clearly am a noob at this.
Thanks for the help
  Reply With Quote
Old 3rd December 2008, 01:50 AM   #2
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
You can wire the dc to ac inverter through a relay off the battery if the inverter is large enough to support sub's wattage. You can actually use the deck's remote wire or accessory power to turn the relay on. Be sure to use a fuse at the battery end, preferably one step above the inverter's total fuse rating.
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote
Old 3rd December 2008, 02:39 AM   #3
banshee is offline banshee  United States
diyAudio Member
 
Join Date: Dec 2008
as i said im a noob at this and i realize this is prolly a stupid question but what is a relay and fuse?
  Reply With Quote
Old 3rd December 2008, 02:58 AM   #4
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
A relay is a small device that uses a small current to connect two things that run at a higher current. The most common aftermarket type is called an standard "automotive" relay. It will either have four terminals or five. You only need to be concerned with the four I will mention. You can buy the 4 or 5 terminal version, it won't matter. Be sure to use a 40 amp version relay if possible, most of the cheaper ones are 30.
The input that turns the relay on would be low current, such as the remote wire of your deck. The contacts (87 and 30) on your relay would be for the battery side (87) and the amp side (30) of your main power wire that comes from the battery to feed your inverter. The fuse will be inline on the power cable and ideally only a few inches from the battery (4 to 18"). The fuse is to limit current, just in case the 12v power cable shorts somewhere in the car, to prevent a fire. It will pop instead of a flame on situation.
The relay would be right after the fuse and will switch power on to your inverter when the remote wire from your deck tells it to.

Here are five of the most common type used:
http://cgi.ebay.com/OEM-HEAVY-DUTY-S...3A1%7C294%3A50

You only need one

So the order of the main power wire would be:
1-battery to fuse, 4" to 18"
2-fuse holder with fuse
3-relay next, anywhere after the fuse, preferably under the hood
4-power wire leaves the relay to your inverter in the vehicle

On the relay you'd connect things as follows:

-terminal 85 goes to chassis ground, you can use the battery ground under the hood
-terminal 86 goes to the remote wire of the radio, use a small 1 amp fuse inline at the radio, just in case the wire gets shorted anywhere, to protect your radio
-terminal 87 goes to the battery through your main inline fuse (slightly larger than the inverter fuse rating. For example, if the inverter has a 25amp fuse, you'd use a 30amp under the hood)
-terminal 30 of the relay will connect to the main power wire that goes into your vehicle and connects to the inverter's 12v input
-ground the inverter with the shortest possible length of wire to a good solid surface on the car's body, scrape away all paint and use a good ring terminal (be safe and don't screw through the body into any brake or fuel lines )

Now, when you turn your radio on, the remote wire will turn the underhood relay on. Terminals 87 and 30 will be connected, feeding 12v from your battery through your fuse to your inverter in the vehicle.
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote
Old 3rd December 2008, 03:22 AM   #5
banshee is offline banshee  United States
diyAudio Member
 
Join Date: Dec 2008
ok...but i have a 12 volt plug-in in my car...why cant i just plug the dc to ac inverter directly into this plug? or can i?
  Reply With Quote
Old 3rd December 2008, 03:26 AM   #6
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
Quote:
Originally posted by banshee
ok...but i have a 12 volt plug-in in my car...why cant i just plug the dc to ac inverter directly into this plug? or can i?
If your inverter has less fusing than the one that is for the acc outlet, it should be ok. The car should have a 20 amp, so the inverter would have to have 20 or smaller. Of course, you need to figure out the wattage the sub draws. Its going to be on the label on back of the sub box somewhere. The inverter needs to have a wattage rating higher than the box draws to prevent the inverter from going into protection and turning off.

If you have to have an inverter that has fusing larger than 20 amp to be able to have enough wattage for the sub for example, then you don't want to use the acc outlet. It would probably be constantly popping your car's fuse (unless of course the sub isn't too powerful)
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote
Old 3rd December 2008, 10:27 AM   #7
banshee is offline banshee  United States
diyAudio Member
 
Join Date: Dec 2008
many thanks, ill try this this weekend hopefully it works!
  Reply With Quote
Old 5th December 2008, 04:43 AM   #8
diyAudio Member
 
Join Date: Nov 2008
Default i've got a great prive on ani nvertor

I've got a great price on an inverter with the 1 ga (or is it 2) , last used in an F150. You need to match the inverter to the amp power requirements to use home audio stuff in your car (you KNEW that!)

If you need it, here's a great price (~ 1kW inverter w/14 to 18 ft wire with crimped ring terminals)......65 + shipping and Paypal.

Larry
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Custom Home Theater Project in New Home, Opinions appreciated. thadman Multi-Way 5 20th November 2008 12:40 AM
WFS for Home use? syntheticwave Everything Else 0 26th February 2008 09:08 PM
car sub for home madman29 Subwoofers 21 13th November 2006 09:14 PM
Anyone tried this at home? universum Tubes / Valves 18 8th February 2004 06:10 PM
Home home or pop pop noise from sub ricky fong Multi-Way 0 26th February 2003 01:15 AM


New To Site? Need Help?

All times are GMT. The time now is 08:49 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2