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  • Kef LS50

    Just finished up testing on the Kef LS50 driver. I hope to run the R-series concentric through the Klippel sometime this weekend. Maybe. I also realized that my calculation for the Kef Q100 I tested last year for surface area was wrong, and I thought I had already corrected it. So, I wound up taking down my data and will re-test large signal parameters for that later as well.

    Results on my site here:
    http://medleysmusings.com/kef-ls50-drive-unit/


    ErinsAudioCorner.com

  • #2
    Kef LS50

    The distortion sweeps look good, with about 50dB separation (~0.30% THD) in the nominal passband for both the woofer and the tweeter. That's superb.

    The woofer's THD hits about 3% at 100hz. The tweeter's 3% THD is at about 1.5khz.

    woofer @ 96dB/1m equivalent:




    tweeter @ 96dB/1m equivalent:




    Overall FR looks good as well, factoring in these drivers are not flush mounted and this does change the response.
    ErinsAudioCorner.com

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    • #3
      Re: Kef LS50

      What was the Fs on the Q100 tweeter?
      ~Brandon 8O
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      • #4
        Re: Kef LS50

        I don't know if I ever tested that, TBH. I'm going to re-test the Q100 and test the R-series concentric soon, so I'll have all that data up on my site soon.
        ErinsAudioCorner.com

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        • #5
          Re: Kef LS50

          Looks improved over the Q100 driver.

          You know what might be a nice solution for you, assuming you have three of the LS50 drivers? A riff on the old Allison speakers: put an 8" or larger woofer (maybe the SB's would work well, since you have them; they'd be great as test mules) on the floor, the LS50 concentric maybe centered 25-28" off the ground and angled back a bit. Two in the corners and one in the middle. Active cross between concentrics and woofers. Set the mid-woofer crossover so that floor bounce is in the stop band of the mid.

          That uses boundaries in your favor to give you more output from the floor mounted woofer as well as eliminate floor bounce, and is possible because the LS50 driver will play cleanly an octave lower than the dedicated mid Uni-Q will.
          --
          "Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)

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          • #6
            Re: Kef LS50

            It's not out of the realm.

            I'm actually considering AE TD10 woofers (either the s or h version). Thinking that flanking this concentric with two of those per cabinet would be pretty sick.
            ErinsAudioCorner.com

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            • #7
              Re: Kef LS50

              That looks like a very nice combo for use as the T/M in a large 3-way.
              Don't listen to me - I have not sold any $150,000 speakers.

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              • #8
                Re: Kef LS50

                Originally posted by ErinH View Post
                It's not out of the realm.

                I'm actually considering AE TD10 woofers (either the s or h version). Thinking that flanking this concentric with two of those per cabinet would be pretty sick.
                If you're thinking about doing it R900 style I still think the R-Series driver would be a better choice than this one, especially given that you have both. This one offers the flexibility of "solving" floor bounce with just a woofer and the concentric, and it's clearly better for use in an SAM1-style speaker where the woofer lowpass is limited by the crossover options available on standard subwoofer plate amps. But in any more standard configuration I don't see any advantages for this one over that one.
                --
                "Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)

                Comment


                • #9
                  Re: Kef LS50

                  Originally posted by ErinH View Post
                  It's not out of the realm.

                  I'm actually considering AE TD10 woofers (either the s or h version). Thinking that flanking this concentric with two of those per cabinet would be pretty sick.
                  Where can someone purchase the Kef driver at, Erin?
                  Click here for Jeff Bagby's Loudspeaker Design Software

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                  • #10
                    Re: Kef LS50

                    You can't without a serial number for a replacement or buy the loaded cabinet.

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                    • #11
                      Re: Kef LS50

                      Winslow is right. You have to have a serial number for replacement part purchase.

                      I wish that weren't the case.
                      ErinsAudioCorner.com

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                      • #12
                        Re: Kef LS50

                        While you've got the LS50 torn apart, any chance of tracing a schematic of the crossover?

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                        • #13
                          Re: Kef LS50

                          If you can't buy it and a set new is in the $1K realm, whats the point?
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                          • #14
                            Re: Kef LS50

                            Originally posted by clydethecat View Post
                            While you've got the LS50 torn apart, any chance of tracing a schematic of the crossover?
                            See first post in this German thread, under "Originale Schaltungstopologie." I think I've seen a schmatic with values somewhere, but can't remember where.

                            Originally posted by 6thplanet View Post
                            If you can't buy it and a set new is in the $1K realm, whats the point?
                            Aren't you interested in knowing what goes into elite commercial speakers?

                            Also, some people will pay $500 or more for a drive unit (Accuton cone, Raal ribbon, TAD compresison driver, etc.), so a $1000 price tag for a pair of really good concentric drivers to use in whatever project isn't necessarily a barrier. That color, however...
                            --
                            "Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)

                            Comment


                            • #15
                              Re: Kef LS50

                              Originally posted by Pallas View Post

                              Aren't you interested in knowing what goes into elite commercial speakers?
                              while I get what you are saying, a $ 1500.00 dollar speaker is not in the "elite" class of anything. it is simply a nice sounding speaker.
                              craigk

                              " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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