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Thread: how do I add a sub?

  1. #11
    Maximum Bitrate SiGmA_X's Avatar
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    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

  2. #12
    Newbie prometheusg's Avatar
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    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.

  3. #13
    Maximum Bitrate SiGmA_X's Avatar
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    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

  4. #14
    Maximum Bitrate SjLucky's Avatar
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    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
    Quote Originally Posted by menudude View Post
    thank you all for your help minus the useless post by sjlucky...

  5. #15
    Maximum Bitrate churnopol's Avatar
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    Quote 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.

  6. #16
    Maximum Bitrate SiGmA_X's Avatar
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    SjLucky - Read my post, I made it clear in the order I am buying parts. And I don't do things cheap if its not the way I want it.

    churnopol - eBay is one of the places I am looking, and a local shop, a guy there will drop the price as low as he can, norammly 20-40%, so his store is in the game.

    I'm thinking I only need about 2x125wRMS for the back and 2x90wRMS for the front speakers, I'm not going all out with them, just some nice Rockford Fosgate 6x9's and 6.5's (Custom mount in front..) And the sub amp, that wouldn't power even one of either the 10's or 12's I am looking at, all in the 500wRMS range

    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!
    1993 BMW 325is - 15.2sec

  7. #17
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    I looked at a RF 501s and Audiobahn A8000T to power my Polk Momo 12" 500W RMS sub. They are both around $190 online and over $350 in the local stores. I tried both, and liked the Audiobahn the best. It has a sub sonic filter that the RF lacks and looks very kewl (chrome with blue underglow lights). But I'm still undecided and looking for an amp around the same price range.

    Ikesound.com was pretty cheap. Sometimes cheaper than ebay. It seems the cheap places usually don't qualify for the manufacturer's warranty and may explain why they are so much cheaper.

  8. #18
    Maximum Bitrate SiGmA_X's Avatar
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    Thank you. Sorry for newb question, but what is a "sub sonic filter"? Also, I was looking at Audiobahn 12Q's (The subs) and everyone said I should match them with Audiobahn amp's too, because of power requirements..
    1993 BMW 325is - 15.2sec

  9. #19
    Maximum Bitrate SiGmA_X's Avatar
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    Hey, how does this look? Rockford Fosgate Punch 801S
    1993 BMW 325is - 15.2sec

  10. #20
    Newbie PFDarkside's Avatar
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    A Subsonic Filter is a low pass filter with a very low cutoff. Some subwoofers are not efficient all the way down to 20Hz (or whatever) and rather than wasting power trying to reproduce a frequency that is unattainable, you can filter it out.
    It's also useful on a vented enclosure for a similar reason. It will prevent damage to the driver at a frequency lower than the tuned frequency of the box.

    It is generally accepted that brands like Legacy and Profile (and Rockwood, Kenford, Boss, et al.) are overrated amps. They will quote "1000W" on the case, but in the real world they are only delivering 250W... The basic rule still holds of $1 a watt, though it's a bit less now (at retail prices). You can find them cheaper on ebay, though... Save yourself the hassle and get a RF, Kicker, etc...

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