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Thread: DIY: I want to build my own components. Questions.

  1. #1
    Join Date
    Jun 2006
    Calgary, Alberta
    Blog Entries

    DIY: I want to build my own components. Questions.


    Aftermarket components cost alot, so I figure why not try to build my own components from the bare drivers. Here are the drivers I am planning to use:

    Dayton ND20FA tweeters
    Audax 5.25 inch Aerogel (really good reviews on the Aerogel series)

    The difficult part is designing the crossovers. I found these two sites which help do the calculations on the crossover:
    I will probably do a 12dB/octave crossover, but I am still undecided on the crossover type and the frequency to cross it at (4000 to 5000 hz, but not sure exactly where).

    The two drivers I am using are both 6 ohm, but what would be the total impedance of the system? Do I just go 1/((1/6)+(1/6))? That would yield 3 ohms, and not the 4 that is recommended from my amp's specs.

    Does anyone have any tips? Feel free to post other advice you may have.

  2. #2
    Variable Bitrate
    Join Date
    Jan 2007
    East Central FLA
    My advice would be to save a few more bucks and get someone to design the crossovers that is familiar with the set. X-over design is not as simple as just setting a frequency.

    That said, the X-over splits the frequencies, so it's 6-Ohms below & 6-Ohms above - so the amp "sees" 6-Ohms across the spectrum.

    You might want to give a look through Parts Express designs, they may have a good match for components and they usually provide the X-over specs needed as well.

  3. #3
    Maximum Bitrate Dennis5587's Avatar
    Join Date
    Nov 2004
    you could also bi-amp and go with an active crossover

    2006 Mazda 3
    Behringer DCX-2496
    JL300/4 Focal 6W4311B Focal TN52
    JL500/1 JL10w6v2

  4. #4
    Join Date
    Jun 2006
    Calgary, Alberta
    Blog Entries
    I guess 6 ohms would be alright for my amp. Maybe just set the gains higher for the same volume. I dont really want to bi-amp, or go active because the crossover itself would cost as much as a set of drivers, plus I dont want to run the extra wiring. I will borrow some speaker building books from the library and start reading those as soon as my finals are over =)

    One more quick question. The tweeters are rated at 15 watts and the 5.25 is at 40 watts. My amp can put out 60 at 4 ohms, so probably a bit less at 6 ohms. Do I risk damaging the tweeters at moderate volumes? I'm guessing the power wont be distributed 50-50 between the two drivers right? Just a little concerned because all these other tweeters I've seen are listed to be able to handle 80+ watts. I usually listen to music at moderate levels, but once in a while I like to turn it up a bit.

  5. #5
    Constant Bitrate symon_say's Avatar
    Join Date
    Aug 2006
    Dominican Republic
    Be careful setting your gains high, cause you can put your amp into clipping zone and damage your speakers, you dont need much power to make home and pro audio stuff louder, cause they're much more efficient, a car speakers is generali between 85-90 dB of SPL, the home and pro audio most of then start at 90dB of SPL.

    For the tweets the crossover should regulate the power difference.
    Design [000000000-]90%
    Parts [000-------]30%

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