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Car amp to power non car speakers?

Discussion in 'Home Cinema & Hi-Fi' started by Mark M, 5 Jun 2006.

  1. Mark M

    Mobster

    Joined: 6 Jan 2006

    Posts: 3,200

    Location: Newcastle upon Tyne

    Ok the scenario is this, Ive just gotten some rock speakers for my garden and I need an amp to power them. I cant afford one this month due to holiday and also dont really have space for the amp in my tiny little house Ive moved into.

    I have a spare car amp kicking about which would be ideal to power the garden speakers and would be screwed onto the inside of a kitchen cabinet.

    Obviously there is the signal wire to get around but thats just a voltage signal isnt it?

    So will it work or would I be best off waiting to get a hifi amp? I wont be having them turned up loud at all so dont need anything powerfull.
     
  2. tom_nieto

    Capodecina

    Joined: 18 Oct 2002

    Posts: 11,060

    Location: Birmingham

    You could use a car amp, but you'd need a pre amp to control source selection and volume. If you have a CD player with output level adjustment or a computer to plug it into you should be ok though.
     
  3. k3v

    Wise Guy

    Joined: 26 Apr 2006

    Posts: 1,200

    Location: NE Derbyshire

    are the impedances different 8 ohm for car and 16 house speakers? will it make them quiet?
     
  4. daz

    Capodecina

    Joined: 18 Oct 2002

    Posts: 23,972

    Location: Bucks

    Car speakers will generally be around 4 ohm whilst home speakers will be 8 ohm. Using speakers with a higher impedance than the amp is designed for will simply result in your amp not putting out as much power - which is perfectly fine. The only trouble is if you run speakers with a lower impedance than the amp was designed for.

    I would be more worried about how you're going to get a constant 12V DC supply. The signal wire is just a 12V switch that tells the amp to turn on and off when the car ignition is switched on and off.
     
  5. monkeyspank

    Soldato

    Joined: 26 Dec 2003

    Posts: 6,317

    Location: cambs UK

    4 or 2 ohm for car and 8 for home IIRC
     
  6. Mark M

    Mobster

    Joined: 6 Jan 2006

    Posts: 3,200

    Location: Newcastle upon Tyne

    Last edited: 5 Jun 2006
  7. james.miller

    Capodecina

    Joined: 17 Aug 2003

    Posts: 19,052

    Location: Woburn Sand Dunes

    yeah good luck with that. car amps draw a massive amount of current when driving a load. hell a half serious amplifier will draw 5-10amps @12v doing nothing at all. A 500mA supply wont cut it mate.

    You could go ghetto and rig an atx power supply up, but honestly for the price of a decent 12v supply, your better off just buying a cheap home-amp from cash-converters or somewhere similar.
     
  8. Mark M

    Mobster

    Joined: 6 Jan 2006

    Posts: 3,200

    Location: Newcastle upon Tyne

    Ah, ok I'll scrap that idea then. Just thought I might beable to use what I had without buying much else.

    I think my best bet is to buy something off a well know auction site or cash convertors as previously mentioned.