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Thread: noobie needs advice on buying a car amp

  1. #1
    Constant Bitrate minghi's Avatar
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    noobie needs advice on buying a car amp

    ok, if you tell me go assemble a computer from scratch, it will take me less than an hour or so.

    if you ask me if i changed my radiator in my car, yes, i did it in a couple of hours or so.

    if you ask me if i am an ebay powerseller, then yes, i am.

    ok,let me cut the crap. now, i am totally unaware of car amplifiers. my vigor has an alpine cd player and alpine speakers and i will be removing the cd player completely from mine to install in my bro's car/ now, i need something to power up the speakers.

    so, i go to ebay and am confused to find different types, some say the ohm's has to match or else ^$%RT%&. then some say, it depends matching with the speakers too to get the perfect sound reproduction like http://www.realcaraudio.com/forums/a...opic/9187.html

    can someone tell me what to look for to get excellent sound reproduction i got with the alpine HU
    400W Power Amplifier -$25
    P3 laptop mobo-$30ish
    128MB RAM-$10
    6GB+80GB 2.5" HDDs-$130
    GPS-$60
    7" TS Lilliput-$280
    10" pioneer 500w sub-$55
    sony xm-3020 30W amp-$10
    jensen 340W A34XP amp-$40
    mp3car.com resources and members- priceless

  2. #2
    Low Bitrate
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    Almost all amps will sound better than head unit powered speakers... Head units put out 25Wx4 or less RMS... almost all amplifiers put out more power...

    Almost all non-woofer car speakers are 4 ohms... when you get into subs, there are wacky type wiring configurations, crazy ohm loads and such like the guy in that line was doing... Assuming that you have 4 speakers and no subwoofer, you probably just need a standard 4 channel amp amplifier... not sure what speakers you have, but check the specs for the max power/rms power and get an amp in the same power range... if those speakers sounded good on head unit power, you can probably get like a 35Wx4 RMS amp and have it sound better/get louder w/less distortion

    Here's the ebay listings for multichannel amps...
    http://electronics.listings.ebay.com...stQQsofocusZpf

    Alpine 4-channel Amps
    http://iweb.alpine-usa.com/pls/admn/...=120&p_main=10


    Best way to figure out how certain amps sound is to go to a car audio store with your model of speakers or specs similar to your speakers and try the different amps with it (Cartoys usually doesn't mind if you try out their demo room stuff)... then buy the amp you like online

    Personally, I'd recommend you with some of the more "Name" brands and buy from an authorized dealer (for the warrenty)...

    Cardomain always has crazy deals going on:
    http://www.cardomain.com/shoptype/Multi-Channel+Amps

    I got my Phoenix Gold Ti500.4 from them for less (~$270) than I could have gotten it for on eBay (~$350), plus it has the full manufacturers warrenty since Cardomain is an authorized dealer.

  3. #3
    Constant Bitrate minghi's Avatar
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    great.

    thank you very much
    400W Power Amplifier -$25
    P3 laptop mobo-$30ish
    128MB RAM-$10
    6GB+80GB 2.5" HDDs-$130
    GPS-$60
    7" TS Lilliput-$280
    10" pioneer 500w sub-$55
    sony xm-3020 30W amp-$10
    jensen 340W A34XP amp-$40
    mp3car.com resources and members- priceless

  4. #4
    Newbie
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    wait joo removing the head unit form yours to give oyur brother.. u ARE buying another deck or building pc right?

    just to clarify

  5. #5
    Constant Bitrate minghi's Avatar
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    pc

    :-)
    400W Power Amplifier -$25
    P3 laptop mobo-$30ish
    128MB RAM-$10
    6GB+80GB 2.5" HDDs-$130
    GPS-$60
    7" TS Lilliput-$280
    10" pioneer 500w sub-$55
    sony xm-3020 30W amp-$10
    jensen 340W A34XP amp-$40
    mp3car.com resources and members- priceless

  6. #6
    Low Bitrate M11VNY's Avatar
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    I bought a 4 channel amp which gives 4 x 75W rms for 100, I'm still running my standard speakers at the moment so am not running at that power.
    Not sure about the make but will find out and post if you like.
    Its down!!!! Sold the Golf so took it out, it's still alive but not installed.

    Progress [-----------] 0%
    Who the Daddy Iz!

  7. #7
    My man uses Levitra. Peoples's Avatar
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    Quote Originally Posted by paradoxblue
    wait joo removing the head unit form yours to give oyur brother.. u ARE buying another deck or building pc right?

    just to clarify
    just to clarify
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  8. #8
    Constant Bitrate minghi's Avatar
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    Quick question: How will it be if I purchase a less wattage amplifier say 40W X 2 to drive speakers which are 80 W X 2?

    Will the amp fry?
    400W Power Amplifier -$25
    P3 laptop mobo-$30ish
    128MB RAM-$10
    6GB+80GB 2.5" HDDs-$130
    GPS-$60
    7" TS Lilliput-$280
    10" pioneer 500w sub-$55
    sony xm-3020 30W amp-$10
    jensen 340W A34XP amp-$40
    mp3car.com resources and members- priceless

  9. #9
    FLAC shakes's Avatar
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    speakers that are 80W x 2? do you mean two speakers that are rated at 80W?

    You need to be concerned with two factors, RMS power and peak power. In short, your amp's RMS and peak power numbers need to be less than or equal to the rating of your speaker. It's ok for your amp to put out less power than your speaker is rated for ... but putting out more can damage the speakers.

    some people will say underpowering a speaker is a bad thing ... that statement in itself isn't really true. What damages speakers is clipping (i.e. saturating the transistors on the amp's inputs or or outputs will cause clipping).

    Anyway, if your speakers are rated for 80W RMS at 4 Ohm, and your amp will do 40W RMS at 4 ohm, that'll work just fine.

    Since you seem to like alpine, you might want to look at the alpine v12 series amps. They've very clean and plenty powerful. I use them in my jeep with my PC. I have a 4 channel for the components and a 2 channel for my sub ... got them new off ebay for about half what circuit city/tweeter sells them for.
    My JeepPC Install

    "there are no stupid questions, just stupid people."

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  10. #10
    Low Bitrate
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    If you run the speakers at closer to the recommended RMS wattage, they will have full excursion (Woofer cone will be out as far as it can go)... and should sound better especially in the lower end frequencies... Underpowering speakers is kindof like pouring a bottle of beer into a 36oz glass... The beer is drinkable and tastes good, but you really are not using the glass to it's full potential.

    My amp is rated at 125Wxchannel RMS, speakers are 75Wxchannel RMS... Why? Found a good deal on the amp after I had already ordered the speakers...

    There is a lot of talk about "overhead" too with amps, with more power than you need/use, you supposedly will keep at the lower end of the THD curve (Most amps operating at max power have a slightly higher total harmonic distortion than they would if running at 50% power)

    It's really about what you want to spend / what you have planned for future upgrades... if you get a higher output amp, you could use it in a higher watt speaker setup in a new car or upgrade the speakers in your current one without having the replace the amp... Especially since Amp technology does not advance very quickly, as the last "great" advance in Class A/B amps, in my opinion, was MOSFET Amplification circuits about 10 years ago... The current "next big thing", in my opinion, are digital input interfaces on amps.

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