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Size of capacitor vs frequency it blocks

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  • #16
    Re: Size of capacitor vs frequency it blocks

    Originally posted by nick650 View Post
    ... I could build an X-over for this whole setup but I feel I can just get by on using some simple caps to do the filtering.
    Actually it's the same thing in function....
    Are the tweeters to be fed a filtered signal off an active crossover?
    "Not a Speaker Designer - Not even on the Internet"
    “Pride is your greatest enemy, humility is your greatest friend.”
    "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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    • #17
      Re: Size of capacitor vs frequency it blocks

      What I'm doing is: Connect the midbass drivers to the amplifier directly with no filters in between the amplifier and midbass speaker. For the tweeters, you can run a second pair of speaker wires from the amplifier (there are advantages to this; it’s called bi-wiring), or simply connect the tweeter
      wiring right off of the midbass or midbass’ wiring. You will then install the capacitor on the positive lead of the tweeter’s speaker wire.

      So technically all i can do is a HP filter for my midrange witch will be set at 50 Hz 24DB slope. The tweeter then needs a crossover or a capacitor. Next issue I looked at is the frequency response of the woofer; doesn't seem to do well after 1k Hz. What I'm getting at is would a crossover with all these cut off's and slops give me better quality sound then running it active in a bi-wiring mode with just a simple capacitor in series for it?

      Thanks!

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      • #18
        Re: Size of capacitor vs frequency it blocks

        Next issue I looked at is the frequency response of the woofer; doesn't seem to do well after 1k Hz.
        The Legatia L1V2 tweeter has an (Fs): 1,830 Hz, and a Recommended Minimum Crossover: 3,200 Hz at 24 dB/octave highpass ( Frequency 2,500 Hz – 25,000 Hz, +/- 3 dB. )
        That leaves a response gap - above 1Khz, and below the tweeters safe bandpass.
        "Not a Speaker Designer - Not even on the Internet"
        “Pride is your greatest enemy, humility is your greatest friend.”
        "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

        Comment


        • #19
          Re: Size of capacitor vs frequency it blocks

          Yes there is a gap and was wondering if it would be best to get a better tweeter to fill in that gap or? Then the next thing is the overlapping and if it is best for the woofer to naturally roll off or build a passive network to fix all that.

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          • #20
            Re: Size of capacitor vs frequency it blocks

            IMO - yes
            "Not a Speaker Designer - Not even on the Internet"
            “Pride is your greatest enemy, humility is your greatest friend.”
            "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

            Comment


            • #21
              Re: Size of capacitor vs frequency it blocks

              Yes to the whole thing or?? I have no clue what I'm doing and need help to figure things out.

              Thanks

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              • #22
                Re: Size of capacitor vs frequency it blocks

                Yes, to finding another tweeter, and to having a preference for a woofer to naturally roll off rather than attempt to fix.
                "Not a Speaker Designer - Not even on the Internet"
                “Pride is your greatest enemy, humility is your greatest friend.”
                "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

                Comment


                • #23
                  Re: Size of capacitor vs frequency it blocks

                  Originally posted by nick650 View Post
                  Yes to the whole thing or?? I have no clue what I'm doing and need help to figure things out.

                  Thanks
                  Looking at the 7" woofer and tweeter curves you linked to:

                  The tweeter's a bit ugly near 2k, unfortunately near its resonance. A cap alone will never roll that tweeter off safely on its own.

                  I'd use a 2 ohm series resistor (pads the tweeter down to the woofer's level) and a 2nd order filter using an 8uF cap, and a small 0.10mH shunt coil (to ground).

                  2nd order on the woofer as well. A small 0.20mH series coil, followed by a 4uF shunt cap, with a Zobel (6 ohm resistor & 33uF cap) across the woofer terminals, AND a 3uF cap in parallel with the 0.20mH coil. This keeps the breakup "garbage" around 4-5kHz in check.

                  This crosses the woofer and tweeter around 4kHz. A 7" woofer starts to "beam" above 2k, but that's all we've got to work with here.

                  Chris

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                  • #24
                    Re: Size of capacitor vs frequency it blocks

                    JESUS THE INFO!! :D

                    I sent you a message and hopefully you can help me a bit more!

                    Thanks a ton!

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