What's the difference between car amps and home audio amps?

Discussion in 'Archived Threads 2001-2004' started by BrianRS, Mar 11, 2003.

  1. BrianRS

    BrianRS Stunt Coordinator

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    Actually, I'm just looking for an inexpensive amp to power 4 of the 25 watt bass shakers. I know I need about 100-125 watts of power and a crossover, but it seems that car amps are much cheaper. Could I use a car amp for this purpose?
    -Thanks.
     
  2. Rick Guynn

    Rick Guynn Second Unit

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    Sure, but then you would have to also buy a DC power-supply capable of feeding the car amp the 10 or so amps of power it needs. I think you'll find that those kind of power supplies aren't cheap. Youre better off buying a cheap plate amp to power them.

    RG
     
  3. BrianWoerndle

    BrianWoerndle Supporting Actor

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    Also, most car amps run at 2-4 ohms, where home theater uses 8 ohms.
     
  4. Chuck Bogie

    Chuck Bogie Second Unit

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    Yeah, but the shakers run at 4 ohms...

    What I'd do in this situation:

    Check out the local goodwill stores, used gear places, etc., and find an old stereo receiver that'll push at least 30 watts/channel. Some "pro sound" and PA amps won't go down to 20hz - don't use 'em. You may be able to score quite a deal on the old gear. Goodwill and Salvation Army stuff tends to be VERY price effective. May be ugly, but hey, you can hide it. Doesn't have to be a name brand either, just so it'll do at least 30 watts/channel down to 20hz.

    Wire the shakers for an 8 ohm load, one set per side of the stereo. Run the stereo on mono.

    What I did:

    I've got an old Marantz 2230 (30/side) receiver.

    Wired 'em for 8 ohm loads. Four of 'em (two sets of wires) under my sofa.

    I split the signal going to the sub, then split it again going into the right and left.

    My little DLS-10 is running at about 1/4 on the volume knob. Signal from the LFE is at +4 on my Denon 1803. The volume knob on the Marantz is at about 2 o'clock (you probably don't wanna crank it all the way - play with it first), and the whole situation is VERY cool. You wanna calibrate your sub with a ratshack meter and your receiver's settings, then after that's done, play with the "volume" on the shakers using your butt to calibrate...
     
  5. Rick Guynn

    Rick Guynn Second Unit

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    Well, if you can't find something decent at Goodwill, just go get one of these from PE :120W Sub Amp

    Wire it up so that you have 2 pairs of shakers, each pair consisting of 2 shakers in series to get to 8 ohm, then wire the pairs together in parallel to get back to 4 ohm. Then plug up to the amp and go.

    RG
     

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