Input Needed v. Building 3-way system for the first time

Discussion in 'OT Technology' started by MaximaDrvr, Apr 30, 2008.

  1. MaximaDrvr

    MaximaDrvr Member

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    So, I am looking at building a 3-way stereo system for my living room.
    I am not looking for anything extremely fancy, but better than ok.

    Here is where I am looking for input.
    What I am looking at so far
    Highs:
    Selenium ST300 Super Tweeter Aluminum Housing
    50W RMS, 8 ohm, 108dB, 1.75'' VC dia, 3.5kHz+
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=264-355

    Mids:
    Vifa P17SJ-00 6-1/2" Shielded Woofer
    70W RMS, 8 ohm, 87dB, 1.25'' VC dia, 35-5,000Hz
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=297-308
    or
    HiVi M5a 5" Aluminum/Magnesium Midbass x2 on each side
    35W, 4ohm, 85db, 1'' VC dia, 50-6000Hz
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=297-437

    Woofer:
    Tang Band W8-740P 8" Subwoofer
    150W, 4ohm, 2'' VC dia, 28-1000Hz
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=264-854

    Crossover:
    500/4000
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=260-152
    or
    800/4500
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=260-230
    Will it matter that this is rated at 8ohm for the woofer and I want to use a 4ohm woofer?

    Also, can anyone recommend a reciever for this setup, or something similar?
    I know alot about car audio, but I know little about home setups and balancing components in a large area.

    Thanks for any input.
     
  2. Doc Brown

    Doc Brown Don't make me make you my hobby

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    That's a really mismatched group of parts.

    Before I forget, yes it does matter if you use an 8 ohm crossover on 4 ohm speakers.

    That horn tweeter is extremeley efficient, and unless you plan on using an L-pad on it,
    it's going to blow the rest of the system out of the water.

    It's always better to match efficiencies ahead of time so you don't need to tweak it later on.

    You'll get best results using a 1" or 1 1/8th" fabric or silk dome tweeter, a dome midrange and
    a traditional woofer.

    The reason you don't want to use a cone midrange is because it becomes very
    directional at relatively low frequencies. So unless you cross it over very low,
    it's going to be beaming a lot of what you hear (poor dispersion).
    Not only that, but if you cross it over that low, you're going to have a hard time
    matching a tweeter to it that low.

    If you want to put something together that will really sound excellent, go with
    these parts.

    Morel MDT-29 1 1/8th" dome tweeter - $46.90 each
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=277-010

    Morel MDM-55 - $86.20 each
    http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=287-020
    These are excellent mids that would sound far better than any cone midrange.

    And for the bottom end, the Tang Band that you have picked is not a bad choice at all
    for the money but you can't use them on an 8 ohm crossover.

    The off the shelf crossovers are really not all that great. You would be better off
    getting them custom made.

    I'm not sure if Partsexpress offers the service or not, but some places will do it for
    a minimal fee over parts cost.
    Or if you can follow a schematic, have them do the crossover for your parts in
    computer software. Either way, the results would be much better than you would
    get from an off the shelf crossover.

    If you can afford it though, go with the Morel parts. I used to have a link saved where you
    could look up DIY speakers that were used in mega dollar systems.
    The Morels were commonly used in 5k to 10k per pair speaker systems.
    Very good stuff.
     
  3. MaximaDrvr

    MaximaDrvr Member

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    Awsome info. Thanks.
    They offer a crossover for 8 ohm mids/highs with a 4ohm sub.


    This was just the info that I was looking for.
     
  4. ssabripo

    ssabripo Banned

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    dude, you can't just put some drivers and off-the-shelf XO's together and expect it to sound good...:ugh:

    doc brown gave you a good suggestion.

    better yet, if this is your first pass at DIY stuff, get something proven done first! here are a slew of them for you to choose from:

    http://www.htguide.com/forum/forumdisplay.php4?f=39

    i would personally start with one of these for you...relatively inexpensive and great sound:
    http://www.htguide.com/forum/showthread.php4?t=15323
    [​IMG]

    http://www.htguide.com/forum/showthread.php4?t=27222
    [​IMG]
     
  5. BLH

    BLH Member

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    Why a 3-way?
     
  6. mephistopholes

    mephistopholes New Member

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