Main > Audio/Jukebox/MP3 Forum
Using car speakers in a cab
Tehrasha:
--- Quote from: Silverwind on February 05, 2003, 01:49:30 pm ---I don't think I quite understand... what's a 10W 4ohm dummy load? I got the 10w and the 4ohm part... but how does this fit into the equation?
--- End quote ---
I think Elkor was trying to help Wade with driving the 2ohm speakers with his amp by loading the amp more appropriately. But since he didnt quote anything in his responce, it was hard to tell and I may be wrong.
As for the whole dual PSU thing, I dont really want to take this into an entire 'theory of powersupply operation' thread.
In every case that I have seen where you need more current, you use a bigger power supply, you do not chain two together.
For Wade, yes, the yellow wire is the +12volts and the red is +5volts.
For Chris and his amplifier that shuts off when sound is applied?
How is it hooked up? The amplifier should have three wires for power, a black (gnd) a red (+12v) and a orange or yellow for 'turn on'
You should have the +12 and 'turn-on' tied together, and hooked to the yellow (+12) from the computer power supply.
Also I would go computer-->double-ganged volume control-->amplifier-->speakers
Using the sub/sat amplifier stage in there wont do any good. I would also look into building a crossover so you can use both the sub and the sat speakers.
For anyone else following this thread, keep in mind that you MUST use a seperate powersupply for this, and NOT draw power from the same power supply that is running your computer.
Chris:
--- Quote from: Tehrasha on February 05, 2003, 02:24:29 pm ---For anyone else following this thread, keep in mind that you MUST use a seperate powersupply for this, and NOT draw power from the same power supply that is running your computer.
--- End quote ---
Heh... I found that one out the hard way, very quickly. :) Thank you for your advice! I'll take a look at the wiring and give it another go.
--Chris
Carsten Carlos:
--- Quote ---For anyone else following this thread, keep in mind that you MUST use a seperate powersupply for this, and NOT draw power from the same power supply that is running your computer.
--- End quote ---
Any special reason for this, or is it only for most powersupplies won't have enough power left for a caramp additional to the PC?
Tehrasha:
--- Quote from: Carsten Carlos on February 05, 2003, 03:07:25 pm ---
--- Quote ---For anyone else following this thread, keep in mind that you MUST use a seperate powersupply for this, and NOT draw power from the same power supply that is running your computer.
--- End quote ---
Any special reason for this, or is it only for most powersupplies won't have enough power left for a caramp additional to the PC?
--- End quote ---
That is the main reason. Your computer PSU is pretty much running at a constant current, except for startup when the drives suck alot of power to spin up. So fluxuations in the voltages are kept to a minimum.
With an audio amp hooked up, especially one that is rated at a higher output than the supply is capable of handling, you have the potential of some very large voltage changes during loud sounds/music.
Your computer and harddrives would be very unhappy if its supply voltage dipped from +12v to +10v for half a second, and if it was enough of a current draw, it could also effect the +5v side of the supply which would be VERY bad for your computer. The audio amp could care less about causing such a dip. It just wouldnt be quite as loud for half a second.
I should experiment with my setup and see how much the unused +5v side of my supplies vary with heavy use of the audio amp....
SirPoonga:
Sorry, OT. Teh, you live:) You aren't just a Teh_away in IRC:)
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