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Thread: how do I add a sub?

  1. #21
    Maximum Bitrate churnopol's Avatar
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    Quote Originally Posted by SiGmA_X
    Question: Is Legacy a good amp brand? They seem to be EVERYWHERE online, and cheap, and high watts. I can't get much info tho!
    I just realized that every car i had had a legacy amp in it. They're pretty good amps. i never had a problem. I had a 500watt, 2x350watt, 1500watt, and some legacy accessories. Modding these amps are easy. I put 3 pc case fans on my 1500 watt amp to control the heat. It's very simple, 1 blows cool air in from one side. 2 blow hot air out th other
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  2. #22
    Maximum Bitrate SiGmA_X's Avatar
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    PFDarkside - So for the 2x400wRMS (800wRMS) setup I want, I should be spending about $800 on the amp??

    churnopol - What type of subs have you used with your Legacy amps?
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  3. #23
    Newbie PFDarkside's Avatar
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    Say a Rockford Fosgate 400x2... The retail will be around $600, but ebay will be about $250 - $300. I'm also using it as an example when it comes to lower tier amplifiers. If you see a Crunch amp for $85 bu it says 1000W, be very leary. Also, if you can, look at the fuse on the back of the amp. A 15W fuse indicates a rather small amp. (15A x 14.4V = 216W max... minus the amplifier's inefficiencies)

    http://cgi.ebay.com/ws/eBayISAPI.dll...category=39744
    800 actual watts, $300 on ebay.

  4. #24
    Maximum Bitrate SiGmA_X's Avatar
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    So are Rockford Fosgate amps good? I was looking at a "JBL BP1200.1 1200-Watt Subwoofer Amplifier" to power two Infinity Kappa 300wRMS subs.. Would the Rockford Fosgate be better, ignoring the extra 200wRMS of power?
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  5. #25
    Newbie PFDarkside's Avatar
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    The JBL BP series are very good amplifiers, esp. considering the price. It would work nicely with two perfects. Are they 4 ohm, Single Voice Coil subs? (That will give a two ohm load. Which you probably already know. )

  6. #26
    Maximum Bitrate SiGmA_X's Avatar
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    I didn't know that about the ohm loads.. Can you explain? This is the sub I am looking at (A pair, of course): Infinity KAPPA 120.3DVC 12" Dual-Voice-Coil Subwoofer But I am keeping my options open, and am still looking at Kicker, Diamond, MTX and Audiobahn.. I really like the Audiobahn's but people from here have been saying no-go with them. My friends locally use them, and the subs rock! Are they really as bad as people here have been saying?
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  7. #27
    Newbie PFDarkside's Avatar
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    OK, so if you look at one of those subs, you'll see two 4 ohm voice-coils. Those can be wired in series for an 8 ohm total load or in parallel for a 2 ohm total load. THEN, the two individual subs can be wired in series or parallel. Your total load can be:
    16 ohms
    4 ohms
    1 ohm

    The lower the impedance, the higher the power, generally. If you look at that JBL amp, it is rated at 1200W at 2 ohms, but only 600W at 4 ohms if I remember correctly. (Never apply a load to an amp that is lower than what the amp is rated for)
    However, that JBL is also rated down to 1 ohm load, but with no additional power gains. So to summarize:

    You can wire them up at a total impedance of 4 ohms and have 300W going to each speaker, or you can wire them up at 1 ohm total load and have 600W going to each speaker.

    Audiobhans - They are good performing and good looking subs. The concern with them, IIRC, is the reliability issue. You may also want to check out the Adire Audio Shiva. www.adireaudio.com It's an ugly (plain) sub, but it was designed for home theater use so it performs excellent and it's pretty cheap too. (~$125)
    The Elemental Designs have also been getting great reviews, and I think one 12" of theirs can outperform most 2x12" setups. (Look at the power handling of them...) www.edesignaudio.com

  8. #28
    Constant Bitrate
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    Sigma - All you want is a AMP with a built in Low pass filter for the sub, and another AMP to power the rest, thats it.

    wire the speakers in the car to the normal AMP make sure its a 4 channel job so you can run 4 seperate speakers, if you get a high power amp then make sure you turn the "gain" down, so as not to blow your speakers

    As for the sub's get a nice powerfull amp, I run a JBL 400 watt and that powers 2 x 12" kenwood subs, plenty of bass, just make sure the amp's LPF is set on,

    Most amps come with High pass filter/Lowpass filter switchability, but make sure you check before you buy.

    The high pass filter part of the amp can be used to power Tweaters only, you may find it will power mid range but its doubtfull, but it filters all the voices
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