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  1. #1
    ride a jet ski Tarheel_'s Avatar
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    bookshelfs driven by car amp....will this work?

    i want to put a pair of Infinity 150s on my boat and drive it with a car amp. I have a cass. deck, cd changer already installed, but the exisiting KLH speakers lack bass.

    So, can i drive them (8ohm) with a system designed for car audio (4ohm)?

    Do you shop the same for car amps as home amps? Wattage measured the same?

    As always, i'm in search of better sound.

  2. #2
    My custom user title This Guy's Avatar
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    speakers are speakers. they'll work fine. Car amps are usually rated for 4 ohms and lower, so take the wattage it puts out at 4 ohms and divide by two and that's how much the amp will put out to those speakers.

  3. #3
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    Angry Home speaker in a car

    Don't you DARE do that one .
    Home spaekers run on usually 8 ohm load and car amps use a 4 ohm load on amp
    Your going to break somethng like amp or spaekers or both !!
    James

  4. #4
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    No problem

    Just keep them protected from the elements. Car amps are usually rated at a 4 Ohm load. Therefore, if you connect an 8 Ohm speaker, you are cutting the load in half. Your amp will now make (approximately) half of its 4 Ohm RMS rated power. I'm just going to assume these will be used in a cabin, otherwise I would get a pair of weather resistant speakers.

  5. #5
    Forum Regular 46minaudio's Avatar
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    Quote Originally Posted by Tarheel_
    i want to put a pair of Infinity 150s on my boat and drive it with a car amp. I have a cass. deck, cd changer already installed, but the exisiting KLH speakers lack bass.

    So, can i drive them (8ohm) with a system designed for car audio (4ohm)?

    Do you shop the same for car amps as home amps? Wattage measured the same?

    As always, i'm in search of better sound.
    I do it on my boat..works fine..I have a pair if Indoor Outdoor 8ohm speakers mounted on the sides of my Ttop.I fish out of Atlantic Beach NC..I have to replace the speakers every two years,but not for running them from a car cd player.The salt eats them up..Here is another inexpensive option..
    http://www.partsexpress.com/pe/showd...number=300-952
    Wher do you boat at??

  6. #6
    My custom user title This Guy's Avatar
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    Quote Originally Posted by James.ca
    Don't you DARE do that one .
    Home spaekers run on usually 8 ohm load and car amps use a 4 ohm load on amp
    Your going to break somethng like amp or spaekers or both !!
    James
    if you're serious, don't you DARE touch another piece of audio equipment again

  7. #7
    Forum Regular N. Abstentia's Avatar
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    Quote Originally Posted by James.ca
    Don't you DARE do that one .
    Home spaekers run on usually 8 ohm load and car amps use a 4 ohm load on amp
    Your going to break somethng like amp or spaekers or both !!
    James
    Please tell me you're joking.

  8. #8
    Listener MikeyBC's Avatar
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    Originally Posted by James.ca
    Don't you DARE do that one .
    Home spaekers run on usually 8 ohm load and car amps use a 4 ohm load on amp
    Your going to break somethng like amp or spaekers or both !!
    James.
    Actually the amp is going to see a much easier load and run cooler with 8 ohm speakers because it is going to supply half the current . Most heat is generated by current NOT voltage. Also as mustang said...it wont put out as much power though, as long as you get the volume you desire there's nothing at all to worry about.
    Musical Fidelity A3.2 Integrated amp
    Musical Fidelity A3.2 CD
    Teac DS-H01 Dock
    Energy 22 Reference Connoisseur Speakers
    Cardas Cross and Cardas Hexlink Golden 5C
    Tara Labs RSC Reference Gen2



  9. #9
    Silence of the spam Site Moderator Geoffcin's Avatar
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    The problem is not the amp

    Quote Originally Posted by Tarheel_
    i want to put a pair of Infinity 150s on my boat and drive it with a car amp. I have a cass. deck, cd changer already installed, but the exisiting KLH speakers lack bass.

    So, can i drive them (8ohm) with a system designed for car audio (4ohm)?

    Do you shop the same for car amps as home amps? Wattage measured the same?

    As always, i'm in search of better sound.
    But the speakers, and how they will react to the enviroment. Boats are notorious for distroying speakers, and if these Ininity speakers are not designed for outdoor use then I would seriously reconsider using them in this application. There's plenty of outdoor speakers to choose from, some made by larger brand names too. I would reccomend looking into one of these if the 150's are not weather resistant.

  10. #10
    ride a jet ski Tarheel_'s Avatar
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    thanks for the input. i choose to run indoor spkers

    over outdoor speakers for a few reasons.

    1- sound - indoor speakers are generally larger and contain superior 'guts'
    2- selection - sooo many more to choose from. Can buy used!
    3- price - for the price of a decent outdoor speaker....one can find a used indoor for less price.
    4- by saving so much money...if they die in a few years, so what? take the savings a buy another pair

    case in point; i use bookshelf (infinity primus 150) on my deck...slightly covered....remove them in winter. They sound wonderful and i bet....better than any dedicated outdoor. I paid $110 shipped (used). Now, you would be pressed to find an outdoor for that price alone. Plus, you'll never find a 'nice' used outdoor speaker.

    46minaudio....i have a house on lake and boat there....only fish on the coast so no salt to worry about

  11. #11
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    Heck, even with the pipes closed cruising at 40, I can't really hear the 4 speakers on my boat.

    Use regular stereo speakers as long as you screw them down thoroughly and do not mind scrapping them periodically. I picked up a pair of large marine speakers from WestMarine-ebay for $77 and after a little mod they are pretty good. Of course, since I use tubies with Magnepans, my standards for coned speakers used with marine/car stereos are pretty lax.

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