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  • 2-channel / 4-channel Amp??

    Alrite, I am finally taking the risk of some serious noob bashing, but I have been going nuts trying to understand how an Amplifier works. Screw those other forums, they are crap...please dont redirect me there!

    So, I have an 05 Altima (2.5S) which has a HU with no AUX. The car has 6 speakers (Factory installed) which are pretty good IMO. I dont wanna replace them.

    Now from what I understand, I need a 4 channel amp for 2 reasons
    1. to connect 4 speakers
    2. to hook up my laptop to the amps

    Here are my questions
    1. One tech at best buy told me that to hook up 4 speakers and a sub, i would need one 4 channel amp, and a second mono or dual channel amp to power the sub...is this true?
    2. Can I use the factory installed speakers with an amp, or do i have to replace them?
    3. If that dude at Best Buy is right, how do u hook up 2 speakers and a sub to a 2 channel amp!?
    4. What limitation does the sound card of my laptop impose on the whole amplifier ordeal?? My IBM T30 has only 1 speaker jack, 1 line in and 1 mic jack.

    Thanks for your help!

  • #2
    1.yes
    2. probably, depending on wattage and resistance
    3. you can't
    4. crappy sound
    Xenia & Isabelle, totally in love!

    'T SQiekenkot: VOLVO 740GL 2.3

    CarPC: none at the moment
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    • #3
      Originally posted by hellbent1 View Post
      Here are my questions
      1. One tech at best buy told me that to hook up 4 speakers and a sub, i would need one 4 channel amp, and a second mono or dual channel amp to power the sub...is this true?
      2. Can I use the factory installed speakers with an amp, or do i have to replace them?
      3. If that dude at Best Buy is right, how do u hook up 2 speakers and a sub to a 2 channel amp!?
      4. What limitation does the sound card of my laptop impose on the whole amplifier ordeal?? My IBM T30 has only 1 speaker jack, 1 line in and 1 mic jack.

      Thanks for your help!
      1. Yes and no. Yes you can hook it up that way OR use a five channel amp that has 4 channels for mids and highs and a sub channel.
      2. You can use the stock speakers but it would be a good idea to check the Ohm rating. Most likely they will be 4 or 2Ohm. This will help choose the size amp you need. If you don't care about blowing your ears out you might also look at an after-market head unit with a good built in amp and AUX input. THis would avoid running power wires, finding a place for the amp, etc. and possibly cut down on price. I would still recommend after-market speakers for better sound though.
      3. I think you misunderstood what he said. The 2 channel amp would be use bridged mono to a single channel for the sub.
      4. A big limitation. Look into either a good quality USB or PCMCIA sound card.

      Hope this helps.
      Aura MR62 (F and R)
      My Current MP3s
      IamDefiler.com

      Comment


      • #4
        Originally posted by Defiler View Post
        3. I think you misunderstood what he said. The 2 channel amp would be use bridged mono to a single channel for the sub.
        Look again, he clearly asked how he could hookup 2 speakers and a sub, all to one 2 channel amp. As IC said, you cannot.

        If you are happy w/ your stock speakers, why dont' you look into an aux adapter from PAC or the other companies?
        Its not the cards you're dealt, its how you play the hand!

        Originally posted by ryuandwings
        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.

        Comment


        • #5
          Originally posted by J187 View Post
          Look again, he clearly asked how he could hookup 2 speakers and a sub, all to one 2 channel amp. As IC said, you cannot.
          Errr...You look again. He is referring to the statement in question one which states, "One tech at best buy told me that to hook up 4 speakers and a sub, i would need one 4 channel amp, and a second mono or dual channel amp to power the sub."

          I think he misunderstood. Anyway I agree with the adapter for an AUX input for the stock HU.
          Aura MR62 (F and R)
          My Current MP3s
          IamDefiler.com

          Comment


          • #6
            Nah, I think J187 is right on this one. At least, that's the way I interpreted it also....
            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

            Comment


            • #7
              Originally posted by Defiler View Post
              1. Yes and no. Yes you can hook it up that way OR use a five channel amp that has 4 channels for mids and highs and a sub channel.
              2. You can use the stock speakers but it would be a good idea to check the Ohm rating. Most likely they will be 4 or 2Ohm. This will help choose the size amp you need. If you don't care about blowing your ears out you might also look at an after-market head unit with a good built in amp and AUX input. THis would avoid running power wires, finding a place for the amp, etc. and possibly cut down on price. I would still recommend after-market speakers for better sound though.
              3. I think you misunderstood what he said. The 2 channel amp would be use bridged mono to a single channel for the sub.
              4. A big limitation. Look into either a good quality USB or PCMCIA sound card.

              Hope this helps.


              Originally posted by hellbent1 View Post
              Alrite, I am finally taking the risk of some serious noob bashing, but I have been going nuts trying to understand how an Amplifier works. Screw those other forums, they are crap...please dont redirect me there!

              So, I have an 05 Altima (2.5S) which has a HU with no AUX. The car has 6 speakers (Factory installed) which are pretty good IMO. I dont wanna replace them.

              Now from what I understand, I need a 4 channel amp for 2 reasons
              1. to connect 4 speakers
              2. to hook up my laptop to the amps

              Here are my questions
              1. One tech at best buy told me that to hook up 4 speakers and a sub, i would need one 4 channel amp, and a second mono or dual channel amp to power the sub...is this true?
              2. Can I use the factory installed speakers with an amp, or do i have to replace them?
              3. If that dude at Best Buy is right, how do u hook up 2 speakers and a sub to a 2 channel amp!?
              4. What limitation does the sound card of my laptop impose on the whole amplifier ordeal?? My IBM T30 has only 1 speaker jack, 1 line in and 1 mic jack.

              Thanks for your help!

              It seems like the question in number 3 is simply that - considering what the guy at BB said, How can I then hookup the 2 speakers and sub to a channel.

              I thougth at first you werer refering to ICs number 3, the answer he gave. I think IC interpuretd the question correctly. the answer is simply, no you cannot. But I don't think the OP misunderstood the BB guy, I think he knew the BB guy was saying that those are the amps he needs. I think he's just totally confused!!!
              Its not the cards you're dealt, its how you play the hand!

              Originally posted by ryuandwings
              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.

              Comment


              • #8
                You can conect the 2 speakers to 1 channel and the sub to the other, and see how long they work before they get damage.

                Get a 4ch amp, use 2 ch for speakers and bridge the other 2 for the sub.
                Design [000000000-]90%
                Parts [000-------]30%
                Installation[----------]0%
                Integration[000-------]30%

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                • #9
                  They won't get damage. The only thing that will happen is you'll only get a mono sound, not stereo.

                  edit: if the amp has separated x-overs.
                  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

                  Comment


                  • #10
                    Depends on the amp. The amp would have to be 2ohm stable, if the speakers are 4 ohm.

                    @Symon - he is asking about wiring 4 speakers and a sub, a 4 channel amp will not serve this.

                    Not going to find a lot of 2 channel amps with independant crossovers either
                    Its not the cards you're dealt, its how you play the hand!

                    Originally posted by ryuandwings
                    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.

                    Comment


                    • #11
                      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!

                      '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

                      Comment


                      • #12
                        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!

                        Comment


                        • #13
                          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.

                          Comment


                          • #14
                            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!

                            Originally posted by ryuandwings
                            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.

                            Comment


                            • #15
                              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.
                              System always under construction


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