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Vifa P21 woofers

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  • Vifa P21 woofers

    Can anyone explain the differences between the Vifa P21wo-10 and P21wo-20?

  • #2
    Re: Vifa P21 woofers

    easy:
    P21wo-20
    -P21wo-10
    ____________
    10

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    • #3
      Re: Vifa P21 woofers

      Originally posted by MGrant1957 View Post
      easy:
      P21wo-20
      -P21wo-10
      ____________
      10
      Well played sir.
      _____________________________
      Tall Boys
      NRNP Computer Sub
      The Boxers
      The Hurricanes
      The Baronettes
      Conneccentric
      UX3

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      • #4
        Re: Vifa P21 woofers

        Why do you ask, what are you trying to accomplish?

        I don't know the answer, but I believe that the -10 was OEM to Vandersteen and perhaps PSB.

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        • #5
          Re: Vifa P21 woofers

          If they were a buyout of old from madisound the magnet was smaller and one dB less efficient. My memory gets fuzzy going that far back.

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          • #6
            Re: Vifa P21 woofers

            Originally posted by billcurrier View Post
            If they were a buyout of old from madisound the magnet was smaller and one dB less efficient. My memory gets fuzzy going that far back.

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            • #7
              Re: Vifa P21 woofers

              Attached my on axis measure of it, in a JPW AP3 cabinet (http://www.canuckaudiomart.com/detai...images/179614/)
              Attached Files

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              • #8
                Re: Vifa P21 woofers

                Originally posted by Pete Basel View Post
                Why do you ask, what are you trying to accomplish?

                I don't know the answer, but I believe that the -10 was OEM to Vandersteen and perhaps PSB.
                I have a pair of Vandersteen 2C speakers that need woofers. One of the cabinets had a P21wo-10-08 woofers, which is not the right driver as the frame is too big to fit in the hole. I have seen the 20 and 33 and wanted to see if they were the same driver with a different number because of who sold it.

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                • #9
                  Re: Vifa P21 woofers

                  I may just sell them as is since I found another pair locally and don't really need another project at this point.

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                  • #10
                    Re: Vifa P21 woofers

                    Originally posted by KeithL View Post
                    I have a pair of Vandersteen 2C speakers that need woofers. One of the cabinets had a P21wo-10-08 woofers, which is not the right driver as the frame is too big to fit in the hole. I have seen the 20 and 33 and wanted to see if they were the same driver with a different number because of who sold it.
                    Are they 2C's without a suffix? I think those had a US stamped frame driver with a clear cone
                    and a foam edge. Are you sure that they are straight 2C's without any suffix?

                    Interesting, I reverse engineered the Vandersteen 2Ci and it used a Vifa woofer built on
                    the same frame as the -20 but with a slightly wider edge - by about 1/16", not much.
                    I did an approximate clone of them, with a few variations, and the -20 worked fine in
                    them, the Vandersteen version would give a bit more excursion but not by much. I measured
                    the Vandersteen version of the woofer but I'd have to really dig to find those numbers.
                    Do your's have a suffix? The letter designation is in the very small print at the bottom
                    of the input plate.
                    Do your's have the midrange with a plastic cone and edge of the same material? It is a Peerless.

                    I know of one report of the P21wo-10 being used in the Vandersteen model 1.

                    Comment


                    • #11
                      Re: Vifa P21 woofers

                      I was not 20 mi. from Mechanicsburg (I-76) a week or two ago.

                      P21WO-10-08: Qts 0.29, Vas 5.2cf, Fs 25, Re 5.8, 91dB, Sd 36.4 sq.in.
                      P21WO-20-08: Qts 0.33, Vas 4.0cf, Fs 28, Re 5.7, 91dB, same Sd (and cone dia.)
                      Should have nearly identical performance in a vented 2cf box (upper 30s).
                      The -20 was rated 80wRMS, the -10 was 70w.

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