car sound system in the home
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=77446
Printed Date: April 29, 2024 at 9:24 AM
Topic: car sound system in the home
Posted By: hairy_mcclary
Subject: car sound system in the home
Date Posted: May 08, 2006 at 11:54 AM
Hi I have recently written off my car and had to remove the gear inside. What I was wondering is, is it possible for a low price to use a transformer to connect to the head unit and amp to create a nice little system. I have a JBL gto75.4 4-channel amp 520watts max. And a Sony CDX-4180-R head unit, 4*40W. What I'm wondering is how much current will be drawn and what transformer would be required. Please help me out people ------------- :-)
Replies:
Posted By: tcss
Date Posted: May 08, 2006 at 11:59 AM
What you need is an invertor. Depending on how loud you want to play it I would guess you will need 15 to 30 amps continuous power. A company called Ashton makes some pretty clean invertors. Expect to pay around $200. Sorry about the car.
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There is no such thing as free installation!
Posted By: the12volt
Date Posted: May 08, 2006 at 12:14 PM
tcss, I think you mean Astron. I use an Astron RS-70A to run the system in my garage. You can find Astron power supplies here: https://www.astroncorp.com/linear.shtml-------------  the12volt • Support the12volt.com
Posted By: tcss
Date Posted: May 08, 2006 at 12:20 PM
Volt, you are correct Astron. Monday morning, lots of cobwebs, spent the weekend at Laguna Seca, beer.
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There is no such thing as free installation!
Posted By: jayson358
Date Posted: May 08, 2006 at 1:05 PM
or u could buy a 12v lawn mower battery from a part store and a 5 amp inverter from a radioshack and use the inverter to keep the battery charged and the battery to supply the amps
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: kirktcashalini
Date Posted: May 08, 2006 at 1:34 PM
wont work... fore more than 30 minutes?
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99 Blazer LT. Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)
Posted By: haemphyst
Date Posted: May 08, 2006 at 4:37 PM
Actually, you need a power supply. An invertor convers from DC to AC, you need to go the other way around. Tripp-Lite makes some very good ones. I use a 40A version on my bench for testing and servicing all kinds of electronics gear. They are not cheap, at all, (the 40A cost me, I think, 175.00) but they are VERY clean DC, and really do provide the current they specify. You CAN, if desired, add a small battery, like a MC battery, in parallel with the power supply for a better filtering, and peak current capacity, power system.
A 40A model should provide you with plenty of power for the items you have. Based on your max power specs above, I come up with 670 watts, and 670 watts divided by 14.4 volts, equals 46A. A little higher than you PS will supply continuously, but: 1, you wont be using it all, all the time, and 2, 46A is based on MAX numbers... 50 to 75% of that for real-world continuous numbers... Even allowing for efficiency, 40A oughta do what you need. ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: saturnsubohio
Date Posted: May 08, 2006 at 5:55 PM
CLICKY
you can also do what i've suggested in this thread but Haemphyst would work much much much better.
and its safe.
EDIT: whoo hoo 50 posts so I can edit the hyperlink ------------- 2006 WRX STI
Electrical Engineer
Ohio University Alumni
Posted By: hairy_mcclary
Date Posted: May 09, 2006 at 5:51 AM
Thanks for you advice, i just need to find one which converts 240vac to 12vdc. 
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Posted By: hairy_mcclary
Date Posted: May 09, 2006 at 5:58 AM
I have found a transformer which is at the right voltage but is only 10A continuous, i need at least a 25A which the head unit speakers removed. dont i?
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:-)
Posted By: hairy_mcclary
Date Posted: May 09, 2006 at 6:05 AM
I was thinking, would it be possible to use an atx power supply, I.E. 550watt one and just use the 12vdc connector. Of course i would have to figire out how to switch it on withouit a motherboard. its because some of these a rated for up to like 25amp. i know i should really be using 40a but i will remove components to get it to work. ------------- :-)
Posted By: hairy_mcclary
Date Posted: May 09, 2006 at 9:13 AM
Would it be ok to use a 40amp car battery charger???? ------------- :-)
Posted By: saturnsubohio
Date Posted: May 09, 2006 at 10:16 AM
hairy_Mcclary wrote:
I was thinking, would it be possible to use an atx power supply, I.E. 550watt one and just use the 12vdc connector.
Of course i would have to figire out how to switch it on withouit a motherboard.
its because some of these a rated for up to like 25amp.
i know i should really be using 40a but i will remove components to get it to work.
Thats what i posted in that thread. the way to switch it on without a motherboard attached is by shorting out pin's 4 and 6. they are the green and black one.. any black wire in combo with the green will work.
also you can use something we use in the Tech Shop @ Work called a ATX PSU Tester. basically shorts it out for you without having loose wires.
Good Luck
Also my 1200.1 JBL amp was powered off a CHEAP 350W PSU.
but again *IT IS NOT ELECTRICALLY SAFE* ------------- 2006 WRX STI
Electrical Engineer
Ohio University Alumni
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