Main > Audio/Jukebox/MP3 Forum
Using car speakers in a cab
Tehrasha:
--- Quote from: Silverwind on February 04, 2003, 03:34:32 pm ---What do you mean about the power supplies "fighting" eachother? The current should only be flowing into the amplifier..
--- End quote ---
Example:
The voltage regulator in PS#1 is +12.005v
The voltage regulator in PS#2 is +12.000v
Hook the two of them together and you would think that it would balance out somewhere between those two values.
But then PS#1 thinks the voltage is two low and tries to bump it up.
And PS#2 sees too high of a voltage and tries to drag it back down.
What started out as a voltage diff of only .005v could easily become a Catch22 of several volts. :o
Eventually one of the two is gonna fry the other as they fight to maintain what each one thinks is the ideal voltage.
--Teh
Chris:
Hmmm... my cabinet has two 100W card speakers, plus a subwoofer from a computer speaker set. I also have a Radio Shack 40W "booster" (2x20W) that I wanted to put in there to power the speakers for the jukebox mode, but I never could find a good power source...
Right now, I have the amplifier board from a cheap CyberAcoustics speaker set; it's about 7W total (1.5W to each satellite and 4W to the subwoofer). The original satellites were 4 ohms, so the car speakers work fine. Should I:
- Attach the 40W amp between the amplifier board and the satellites?
- Attach the 40W amp between the computer and the amplifier board?
- Replace the amplifier board with the 40W amp and a dual gang stereo taper pot for volume control, eliminating the subwoofer?
And how much power should a 40W amp require? I tried a 12V line from a 250W AT power supply, but the moment I turned on the amp it would cut out....
--Chris
Wade:
I saw this thread and thought I'd give it a try since I still need an audio setup for my cabinet.
I had a pair of 6.5" bose subwoofers from my car, and a 60w x 2 (I think) Sony car audio amp. I hooked this up with an old AT power supply and it worked. On a very low volume, it was WAY too loud, this was with the speakers just laying on the floor (would probably be even louder in an enclosed cabinet). I think these subs are only about 2 ohms each so that might explain why it was so loud.
Anyway, I have a few questions:
1) I used a black and yellow wire from the power supply. My voltmeter wouldn't work! Is this the 12v supply or the 5v?
2) Does anyone know of any very inexpensive equalizers? This setup had far too many highs and mids. If I can get a cheap passive eq I'm sure I could get a satisfactor sound out of this setup.
3) The subs have HUGE magnets. Almost as big around as the speakers themselves. I have a feeling I will need shielding. Can I just use some of the aluminum flashing sold at Lowes/Home Depot? Any tips?
Thanks!
Wade
Chris:
--- Quote from: Wade on February 05, 2003, 08:58:15 am ---I had a pair of 6.5" bose subwoofers from my car, and a 60w x 2 (I think) Sony car audio amp. I hooked this up with an old AT power supply and it worked.
--- End quote ---
Hmm... if you could get a 60Wx2 running with an AT power supply, why couldn't I run a 20Wx2?
What was the wattage of your AT power supply? Do you know how many amps are provided on the 12V line (it may be on the label)?
Thanks...
--Chris
Wade:
--- Quote from: Chris on February 05, 2003, 09:50:31 am ---
--- Quote from: Wade on February 05, 2003, 08:58:15 am ---I had a pair of 6.5" bose subwoofers from my car, and a 60w x 2 (I think) Sony car audio amp. I hooked this up with an old AT power supply and it worked.
--- End quote ---
Hmm... if you could get a 60Wx2 running with an AT power supply, why couldn't I run a 20Wx2?
What was the wattage of your AT power supply? Do you know how many amps are provided on the 12V line (it may be on the label)?
Thanks...
--Chris
--- End quote ---
I'm not sure about the wattage but it was from an older PC, probably 200W. I can check all this tonight. It did have the amps listed on the label.
Just because it worked doesn't mean it would work for a long time if I had it turned up loud. It might burn something up if I did.
So is the yellow and black line the 12V or the 5V?
Thanks,
Wade
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