Pasta farts
Hopefully some of you electrically types could help me out.
I've got a boxed 12" sub with 300w amp that I used to run in my car. Don't have a car anymore so I thought i'd hook it up to the home theatre system.
What would a suitable transformer be so I can plug it into the mains? Found a heavy duty one, that can supply @ 25A, but that's a bit excessive. I'd just want to run the one amplifier off it.
Help?
Last edited by Devil; 3rd July 2007 at 10:01.
His Excellency
Try talking to a model train enthusiast
They have to step power down, and vary amperage.
Some of there set ups are quite large, but run on low voltage.
Large Falcon Collider
Hee hee, I thought you meant you only wanted to run 1A off it, so I was going to say: "ummm a 12v 1A transformer?".Originally Posted by Devil
Technically 300W/12V = 25A ... *shrugs*
Thats a big transformer.
"If life gives you a shit sandwich..." someone please complete this expression
Pasta farts
Surely it cant require that kind of current??
DSE has one for $350 that deals with up to 25A.
For that kind of money i'd probably be better off buying a 240v power amp instead and removing the existing amp!
One, two free, floor!
yeah... big tranny.
You might be better off to sell the AMP on tardeme and replace it with it's 240V equivalent...
$2,000 cash if you find a buyer for my house, kumeuhouseforsale@straightshooters.co.nz for details
Pasta farts
Not that I doubt your knowledge, but then how does the car deal with running it? Very high current charging system?
Bah @ money!
sdkfz
300W PMPO, RMS, or...
Measure once, cut twice. Practice makes perfect.
Pasta farts
It's RMS....
...I dont think and Amp pumping out a whopping 300W PMPO will be pushing a 12" earthquake sub too far! heh
Rasta Ratskins
Try Jaycar electronics[www.jaycar.co.nz] You need a power supply that is clean enough to power an amp, not just any old 12vDC will do it so I've been told.
Only a Rat can win a Rat Race!
Pasta farts
Ok, let me think about this. I have a pair of Denon AV amps at home. The main one is powering all speakers, 80w per channel. On the assumption that it has an internal crossover (fair assumption), I could run the sub pre-out from that one, into my second denon amp (55w per channel output). Then bypass the amp built into my sub, and run it using the speaker outputs, bridged.
Does that sound like it'd work?
edit: Hrm, I wonder if the second denon has a Slave-in.
Forum whore
The cheapest way would be to run it of a 12v SLA battery that is continuously maintain by a cheap battery charger.
You could do this for under $100
If you have the 300VA transformer you could build a power supply for under $50.
You will need some filter caps and a rectifier.
Highway Biker
I would also look at getting a second hand deep cycle battery ( you could get it new, but damn, they're not cheap ) and run that in parallel with your power supply - this is just to allow the amp to always get the current it requires, and will reduce the "clipping" you would likely otherwise get.
Pasta farts
If only I still had my 1.5kw power amp still lying around!
Cheers for the responses people.
Come warm yourself by the fire
Ok for a start.....the 230 is AC and your amp is DC so you gonna have to do more than step down. regulate and rectify the preacher yells.
Cheapest option is if your only going to run low power is get a cheap battery charger and hook that up. High power your fucked.
But you will prob find that power ratings when it comes to amps is all bullshit.
WasPhantom has it sorted
Reactor Online. Sensors Online. Weapons Online. All Systems Nominal.
Come warm yourself by the fire
Your channels and reference channels (front back) aren't split between the amps?
Also watch out for internal phase crossing and one amp burning out the other.
Reactor Online. Sensors Online. Weapons Online. All Systems Nominal.
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