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Old 12th May 2004, 04:53 PM   #11
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK
Originally posted by A3rd.Zero
I was thinking about a car head unit. Do you know what is typical current draw from a car head unit?

Phase_accurate: What?, Please explain.

Thank you

Hi Milo,

I'd expect static current to be quite low < 1 amp.

With typical efficiencies of class aB output stages and output
25W per channel clipping (x4) you can expect around 5 amps
average current drain, peak current ~ 10 amps.

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Old 12th May 2004, 05:03 PM   #12
motherone is offline motherone  United States
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Join Date: Apr 2003
Location: Seattle
I would assume that using lower impeadence speakers would cause more current draw than the 6 ohm speakers you're currently using.

My personal opinion is that if you're looking to make a "hi-fi" boombox, I would probably stay away from the integrated amps in a car stereo headunit. However, it would probably be a great idea for the cd/radio portion of the boom box. Heck, you could even look for one of the double-din units that has a tape deck so you could really get that boombox effect

Maybe a decent headunit off of ebay + gainclones would equal something pretty dang tasty. Another option on the speakers is you could always have a foam bung or something to stuff the port to give you the "boom", with the option of removing it when you actually want it to sound decent
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Old 12th May 2004, 07:04 PM   #13
A3rd.Zero is offline A3rd.Zero  United States
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Join Date: Nov 2003
Location: Los Angeles
I like the idea of using the preouts and then using a gainclone or some such. It would be nice to use a head unit, which has the option of upgrading. I could even use one from the car and just plug it in when Im ready to go!

Ok now about the speakers, Im thinking something simple like the GR AV-1. I also like the idea of using a bg neo8 just for fun, but I dont know if I need a tweeter (not sure about its top end). Then the speaker boxes will in essence just be a woofer box, that might help get the low end.

Thanks for your help guys.

With ~2amps draw I guess i'm not going to try this with batteries, just AC on this one.

How did I live without Nina Simone for so long?
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Old 12th May 2004, 08:15 PM   #14
gainead is offline gainead
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Join Date: Oct 2002
Location: Bowling Green, KY
This year Panasonic makes an in-dash head unit using the new Texas Instruments digital amplifier technology. Described in detail here http://www.analogzone.com/avp_0105.htm. It is really efficient and provides 60 watts per channel of actual good clean RMS power. MXE CQ-C9800U.
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