the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

car head unit and amp in home


Post ReplyPost New Topic
< Prev Topic Next Topic >
mp2031 
Member - Posts: 7
Member spacespace
Joined: July 22, 2008
Location: Australia
Posted: July 22, 2008 at 8:07 PM / IP Logged  
im trying to use a 13.8v DC power supply rated at 75amps 1000w for a car head unit and 4ch amp just wondering if anyone has done this before
Milescar head unit and amp in home -- posted image.
DYohn 
Moderator - Posts: 10,740
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: July 22, 2008 at 8:32 PM / IP Logged  
Sure.  What do you need to know?
Support the12volt.com
mp2031 
Member - Posts: 7
Member spacespace
Joined: July 22, 2008
Location: Australia
Posted: July 22, 2008 at 8:38 PM / IP Logged  
well i'd like to power a 4ch amp rated at about 4x75w at 4ohms , head unit and possibly another sub amplifier if possible or maybe a 4ch amp 2 run speakers and bridged rear as sub just wondering what would be best and would this all work or do i need another/bigger power supply
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: July 22, 2008 at 9:31 PM / IP Logged  
Do the math.
A head unit (not driving speakers) will pull 5-7A
75X4=300/.5=600 (running WFO)
600 watts in / 13.8V = 43A
43A + 7A = 50A
75A - 50A = 25A
25X13.8=345W left over
A Class AB amplifier would be 175WRMS or a Class D amp would be around 300WRMS. That's how much additional you MIGHT have, depending on the honesty of the manufacturer of the power supply. A cheapie Pyramid? Not honest at all, and QUITE over-rated. An expensive Astron? A bit under-rated. What have you ACTUALLY got in a power supply?
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."
DYohn 
Moderator - Posts: 10,740
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: July 22, 2008 at 9:32 PM / IP Logged  
Well if your power supply is rated for 1000 watts I'd suggest powering amplifiers/head unit totaling no more than about 500 watts audio output power.  Should be fine.
Support the12volt.com
mp2031 
Member - Posts: 7
Member spacespace
Joined: July 22, 2008
Location: Australia
Posted: July 22, 2008 at 9:55 PM / IP Logged  
ah k , i have 2x soundstream 6x9 sst6.9 (2x150Wrms) , 2 x focal polyglass 165 V1 (2x70Wrms) , 12" mtx sub (1x300Wrmx) (might upgrade that sub) , and a 13.8 v DC power supply 1000w 75amps . no amplifiers or head unit yet , just wondering to power all this would i need another powersupply or will this do ?
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: July 23, 2008 at 3:09 PM / IP Logged  
Again... It doesn't matter what the speakers are rated. If you are planning on running them WFO all the time, then you need to size your amplifier(s) appropriately, but if not, then you have to take DYohn's suggestion, and decide on no more than 500 to 600 watts of RMS (and I do mean RMS - disregard c o m p l e t e l y any "peak" or "max" numbers...) amplifier power. That's all you are going to be able to run on that power supply, 500 to 600 watts, whether you are using 50 watt speakers or 1.21 gigawatt speakers.
And you STILL didn't mention what kind of power supply you have. We'll need to know that to determine if ANY of the information we have provided can REALLY be accurately applied to your situation.
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."
bullseye753 
Copper - Posts: 61
Copper spacespace
Joined: May 27, 2008
Location: North Carolina, United States
Posted: July 23, 2008 at 3:24 PM / IP Logged  
GREAT SCOTT! did you just quote back to the future!?
megaman 
Copper - Posts: 385
Copper spacespace
Joined: June 24, 2008
Location: Montana, United States
Posted: July 23, 2008 at 3:54 PM / IP Logged  

haemphyst wrote:
.... That's all you are going to be able to run on that power supply, 500 to 600 watts, whether you are using 50 watt speakers or 1.21 gigawatt speakers.

WHAT THE #@$% IS A GIGAWATT?!?! lol

mp2031 
Member - Posts: 7
Member spacespace
Joined: July 22, 2008
Location: Australia
Posted: July 23, 2008 at 7:21 PM / IP Logged  
haha sorry mate forgot to mention that , its custom made a mate did it for me and believes it puts out 1000w , as for the amp i would get around 400w for the speakers and i guess il have to wait for another power supply to power the sub + another amp.
thanks for your help guys
Milescar head unit and amp in home -- posted image.
Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Monday, January 30, 2023 • Copyright © 1999-2023 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer