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Thread: 2-channel / 4-channel Amp??

  1. #11
    FLAC XC-C30's Avatar
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    Indeed, there arn't many amps that have an x-over per channel, but there are a few.

    But in general, not looking for a specific amp that has this extra feature: No, you can't hookup 2 speakers and a sub to a 2-chanel amp.
    Xenia & Isabelle, totally in love!

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  2. #12
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    Quote Originally Posted by J187 View Post
    why dont' you look into an aux adapter from PAC or the other companies?
    PAC or anyone else doesnt make an adapter for my car stereo...I even opened up my HU and tried to make my own aux port, but cudnt coz the pins are extremely tiny.

    Anyway, thanks guys for answering my questions! I really wouldn't have bothered with the amp if i could find another place to install my screen. The reason i wasn't considering installing a new stereo with an aux port is bcoz i want my screen to be located where the stereo is. This left me with the option of installing a freekin amp...

    So now im gonna either have to get a new stereo and install the screen in the top cubby, or get an amp and install the screen at the center of the console. tough decision...

    If i do decide to install an amp, i will be back with more questions

    Cheers!

  3. #13
    Constant Bitrate
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    You can technically make RCA inputs and outputs for your stock head unit. Of course it varies from car to car though.

    Does your car have a stock amp? If it does you can technically find a wiring diagram that shows you what each wire is. Using that you can follow/find the stock amp and make RCA inputs and outputs. Im pretty sure you would be at least able to make an AUX input considering most cars these days have options like a six cd-changer, xm, sirius, etc. that you can add to your exisiting stock radio.

    As for the AUX outputs to use for an aftermarket amp, you need to find out if your stock headunit controls volume through the headunit or through a stock amp (if you have one). If you dont have a stock amp, you can solder RCA connectors to the wires that correspond to the speakers; sort of like a line converter. So if you were doing an RCA for the front left channel, the positive wire from the front left would be the posistive of the rca (always tip) and the negative of the front left channel would be the negative of the rca (always outer). You would need to make four in total, one for each channel.

    Now if you have a stock amp that controls volume, the same steps apply to make RCA outputs but you would need to solder them to the output wires out the stock amp or the outputs from the volume controller of the stock amp.

    Using this method would give you what you want and probably be the cheapest, but sound would not be as good as getting a new aftermarket headunit. Also, if you do have a stock amp, the sound might be already crossed-over coming out of it. This means that if you do decide to get a sub later to be used with your stock headunit, lower frequncies will not be loud or not play at all.

    Man that was a long reply.

  4. #14
    FLAC J187's Avatar
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    http://www.mp3car.com/vbulletin/car-...io-nissan.html

    there are hundreds of Alima installs on the site, check em all out, see if one fits your needs. If you like, post a pic of your exact dash and we can help suggest some install locations.... I'm guessing you do not have the compartment on top where a factory screen goes in those Altimas?
    Its not the cards you're dealt, its how you play the hand!

    Quote Originally Posted by ryuandwings View Post
    Where can I get a roll of tin foil?
    I been looking for that all over the net, but I can't find it.
    Please help.

  5. #15
    Car Audio Moderator durwood's Avatar
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    hahaha I am a little late on this one but I thought I would throw a monkey wrench in just to stir the pot. Most amps that I know will work in whats called a "tri-mode". This makes #3 possible. Now the question is should you do it? I tried it a long long long time ago and I hated it. Not enough power on the sub. The gain adjustment affects the regualr speakers and te sub at the same time so you can't adjust it independently.

    Tri-mode works by using a passive crossover on the outputs. High pass for each one of the regular speakers in stereo and then a low pass on sub bridged mono, all on a 2 channel amp. Crutchfield used to actually sell the special crossovers for tri-mode. I think they were made by pacparts but you can make your own too.

    Like I said though, I wouldn't recommend it because is sounded like crap.

    You could use a 3 channel, a 4 channel in addition to a 5 or 6 channel amp. It depends on the ohm rating of your speakers and if you want to be able to adjust front and rear independently.

  6. #16
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    Quote Originally Posted by J187 View Post
    http://www.mp3car.com/vbulletin/car-...io-nissan.html

    there are hundreds of Alima installs on the site, check em all out, see if one fits your needs. If you like, post a pic of your exact dash and we can help suggest some install locations.... I'm guessing you do not have the compartment on top where a factory screen goes in those Altimas?
    Hey, I do have the top cubby you are referring to...but fabricating the screen into that will be a bit of a pain and infact a little hard to reach...i was leaning for something like what edrex has done with his screen install

    2005 Nissan Altima - digital-car.co.uk

    seems easy and fairly clean. I have been scavenging this forum for all altima installs and found edrex's install the best However, I am open to suggestions !

    Quote Originally Posted by durwood View Post
    hahaha I am a little late on this one but I thought I would throw a monkey wrench in just to stir the pot. Most amps that I know will work in whats called a "tri-mode". This makes #3 possible. Now the question is should you do it? I tried it a long long long time ago and I hated it. Not enough power on the sub. The gain adjustment affects the regualr speakers and te sub at the same time so you can't adjust it independently.

    Tri-mode works by using a passive crossover on the outputs. High pass for each one of the regular speakers in stereo and then a low pass on sub bridged mono, all on a 2 channel amp. Crutchfield used to actually sell the special crossovers for tri-mode. I think they were made by pacparts but you can make your own too.

    Like I said though, I wouldn't recommend it because is sounded like crap.

    You could use a 3 channel, a 4 channel in addition to a 5 or 6 channel amp. It depends on the ohm rating of your speakers and if you want to be able to adjust front and rear independently.

    Interesting, well that makes it clear, im not gonna use a 2 channel amp for sure. I didnt know 3 channel amps existed grrr it wud be all so easy to just buy a freekin stereo with aux port (and maybe a built in amp) but then I wudnt know where to put the screen!

  7. #17
    FLAC XC-C30's Avatar
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    you could put the screen in your dinslot. Detach the faceplate of your HU and mount it in the sun visor and put the deck its self somewhere else (glovebox maybe?). This option however, does require some soldering skills.
    Xenia & Isabelle, totally in love!

    'T SQiekenkot: VOLVO 740GL 2.3

    CarPC: none at the moment
    CLARION HX-D2
    CLARION APA4300HX => Fountek NeoCd1.0 + TB W4-1337SD
    CLARION APA4300HX => CSS Trio8
    CLARION APA2100 => Dayton IB385-8

  8. #18
    FLAC J187's Avatar
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    Can you fit the HU in the lower pocket, a new one I mean. It would be nice. I love HUs down there.

    I Relocated my HU down low like that in my own personal car, the one I had before the truck I have now. I loved it there. The face of the Alpine tilted up too w/ a couple different settings.

    [IMG][/IMG]
    Its not the cards you're dealt, its how you play the hand!

    Quote Originally Posted by ryuandwings View Post
    Where can I get a roll of tin foil?
    I been looking for that all over the net, but I can't find it.
    Please help.

  9. #19
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    Here is a picture of my dash....JI87, where are u suggesting the stereo? in the bottom cubby? :s

    I really want to have my screen where the HU is...IC-C30, will explore ur idea...thanks a lot
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  10. #20
    Car Audio Moderator durwood's Avatar
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    Is that a map pocket above your stereo? Why not put your screen there? Then you could put install an aftermarket radio with aux in in your radio slot. Just another idea. At least you have a ton of room to play with. Also it is obvious you have a double din slot. You could get a retractable 1din screen AND an aftermarket radio in that factory radio slot easily.

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