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how do I add a sub?

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  • how do I add a sub?

    Ok, I finally have a couple of speakers up front and an amp to power them but I'm lacking bass (the up front speakers are only 5.25 inch), my amp is a 2 channel Boss C-150 (100wx2 max).

    I dont have a sub or any other speakers yet, but I'd like to add something... How would I add a sub to my setup?

    The soundcard on the PC goes directly to the RCA inputs on the amp. (using a stereo plug to RCA adapter).

    My idea for the future of this project is to buy another amp and use it to power the rear speakers of a 4 speaker setup (using my soundblaster live value's 4 speaker mode). I'd plug the second output on the soundcard into the second amp.

    BUT, my next investment before the 4 speaker upgrade has to be a sub! I need some more bass...

    Suggestions? or how do I add a sub!!??

    TiTUS

  • #2
    hmmm...

    Ok, do I just add another set of wires from one of the channels wired to a sub? Or is it not that simple??

    please help me I'm a car audio newbie!!

    TiTUS

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    • #3
      because you asked so nicely...

      There are many variations of sub setups, but the bottom line is you need to separate the low Hz tones from the high Hz tones...the sub is good from about 20hz to 80 hz. From 80 Hz and up you can use your smaller speakers.

      So you need some kind of crossover, to split the highs from the lows.

      There are some home self contained subs that have that built in...I think there are some preassembled car audio subs that also have it built in (like a Bazooka or something like that)

      The sloppy way would be to get a "Y" splitter, and connect all the inputs together, but the sound would be fairly bad.

      Now if your soundcard is designed with a Sub output, then probably you could connect your sub directly to that, and hopefully the sound card would do the crossover work...you will have to read the owners manual on that one.

      So go to a car audio store, and tell them you want to add a sub to your system, and you have preamp outputs from your head unit...see what they have to offer.
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      • #4
        thanks, that clears things up a little...

        one more thing.. a crossover removes frequencies right? so a sub crossover removes all high frequencies and leaves the low frequencies for the sub? correct?

        ok, so is there a crossover that removes low frequencies and leaves only mid and high frequencies for the smaller 5.25 inch speakers I have? I'm noticing that with really deep bass they (and the dashboard rattle, or could just be the dash...)...

        Thanks again!

        TiTUS

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        • #5
          Simple solution...

          Use splitters for your RCA jacks, get a dedicated sub amp, and use the built in crossover. See how it sounds, and if yo ureally want to subtract the bass frequencies from your front speakers use passive filters (caps) until you get a nice crossover setup.

          Will it work as nicely as having a pro corssover/pre-amp? No. But, you are using a Boss amp, so this solution fits in with the level of the rest of your system. (No sense in wasting money on a component that won't add to a system)

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          • #6
            might I suggest coustic crossovers, inexpensive and excellent
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            • #7
              Most decent mono subwoofer amplifiers will have a crossover built in. Set it for 80Hz with a crossover slope of 12 or 24db per octave. Here's a link about car audio systems if you want more info:
              http://www.eatel.net/~amptech/elecdisc/caraudio.htm
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              • #8
                Ok, here's my pinion about this:

                Yeah, get an amp just for your subs with a built-in crossover. I would go for a Rockford Fosgate amp. Try to find a model that accepts high level input and low level input (just in case you need to.. they are the same price as the just low level ones)


                As for the front and rear speakers, you should buy a crossover so you could split higher range of sounds (80-120 Hz+) to get a better sound.

                C ya!
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                • #9
                  I'm just starting to figure this all out too, so don't jump me I am looking at Rockford Fosgate (RF, to make it short) amp's and subs.. And speakers, of course. I am going to add the amp and 2x10's (Subs) first. I was thinking about running them on the Sub wire from my headunit, but then I thought why not just do it all once and run the wires from the computer to the amp for the subs. So, being the type that wants to buy the proper **** the first time () should I buy a crossover too for this, and if so, what type would I want (So in the end, it will be computer -> crossover -> 3 amps [Front, back, subs])

                  Thanks for bearing with me
                  1993 BMW 325is - 15.2sec

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                  • #10
                    Whats you sound card setup? If you haven't already have a 24bit x.1 soundcard then you should check this one out.

                    If you really want to go all out. Get a 7.1 soundard and a bunch of speakers. Keep your 3 amp configuration. But have two 4 channel amps and one for the sub.
                    Falcon cr53 w/ via epia m10000. Nokia 3650 blutooth phone.
                    Better than winamp. Click here for qcd player.

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                    • #11
                      churnopol - I'll answer that so you can help me I am using onboard on the VIA for now, until I get a USB (I want to see how ****ty it really sounds running via my HU) then if its bad, I'll order a USB sound card.

                      Now, regarding multi chan amps.. What setup should I get for front/back speakers, both cost and power wise? And about the damned crossover..Info?
                      1993 BMW 325is - 15.2sec

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                      • #12
                        One reason you might want to go through a headunit is you have easier control over the sound. You also still have sound if the carpc dies or while its being worked on.

                        I'm not sure why you need two 2 channel amps for F/R speakers. Why not just one four channel amp?

                        As for wattage, higher wattage = cleaner sound (also louder because cleaner signal at higher power).

                        When choosing an amp, its RMS wattage should be in the upper third of the speakers power range.

                        So if your speakers can handle 50W RMS, go for an amp that can deliver 50W/ch. Any more and you risk blowing out the speakers.

                        YES, get crossovers. They are well worth it. Even just a capacitor is better than nothing. High pass for passing higher Hz to regular speakers, and low pass for passing low Hz to subs.

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                        • #13
                          Well, I was planning on using a HU for now, but I would like to remove it soon, as it's not really needed once I get a radio tuner, but time well tell.

                          I wasn't sure weather to go with one or two amps for the speakers, I'll cheak price on a 4-channel one tonight.

                          So how do I choose a crossover? I really know NOTHING about them
                          1993 BMW 325is - 15.2sec

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                          • #14
                            if you want cheaper and hella easy
                            get some mid range speakers and pick the one that has the lowest freq
                            it will get you more bass and you wont have to get a sub/box combo or whatever. that way you can save up more money and get somein bangin and some tweeters and etc etc etc etc
                            Originally posted by menudude
                            thank you all for your help minus the useless post by sjlucky...

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                            • #15
                              Originally posted by SiGmA_X
                              churnopol - I'll answer that so you can help me I am using onboard on the VIA for now, until I get a USB (I want to see how ****ty it really sounds running via my HU) then if its bad, I'll order a USB sound card.

                              Now, regarding multi chan amps.. What setup should I get for front/back speakers, both cost and power wise? And about the damned crossover..Info?
                              check out ebay for speakers, nowhere else beats ebay prices.

                              Here's a digram of what a 7.1 speaker setup should look like. Of course in a car setup the sub would be in the back.

                              I would go for 2 4 channel 300watt amps for the front and rear speakers. For the sub you should get a Profile 600MSX 300watt mono sub amp. Here's a link for crutchfield
                              But they're way too expensive, you can find it cheaper somewhere else

                              USB?
                              I stumbled over this 7.1 channel usb sound card.
                              http://news.harmony-central.com/Newp...a-Theater.html
                              http://www.midiman.net/products/cons...atre_page1.php
                              Falcon cr53 w/ via epia m10000. Nokia 3650 blutooth phone.
                              Better than winamp. Click here for qcd player.

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