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  • Spiral Groove Centroid Arm

    Know a couple of members have experience with Allen's arm. I've always respected his work but that oil bath and changing heights and tracking force has always intimidated me. Would love to know more about the Centroid arm!
    Myles B. Astor, PhD, Administrator
    Senior Editor, Positive-Feedback.com
    ________________________________________

    -Magico S5 Mk.2 speakers with SPod feet
    -Goldmund Telos 280 stereo amp
    -Goldmund Mimesis 37S Nextgen preamplifier
    -Doshi V3.0 phonostage
    -VPI Vanquish direct-drive turntable
    -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
    -Lyra Atlas SL Lambda, Fuuga, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
    -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
    -Assorted cables including Transparent XL Gen. 5, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords
    -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA platforms.

  • #2
    Dennis Davis tells all at TAB: Spiral Groove • Centroid Tonearm; iirc, he bought the review unit.

    Comment


    • MylesBAstor
      MylesBAstor commented
      Editing a comment
      Is that current?

    • Guest's Avatar
      Guest commented
      Editing a comment
      That being the tonearm currently in his system? I believe so.

  • #3
    I bought one about a year and a 1/2 ago. Very simple and easy to set up. First thing you notice about when when playing is how quiet it is...and then how the dynamics emerge from there. I've used a Lyra Atlas, Jan Allaerts MC2 Finish and a Goldfinger Statement v2 all with great sound.

    -The tracking force is as easy as it gets...just turn a wheel...
    -Oil bath? Not sure...what you mean here...might be a older model?
    -Heights is easy to...just insert a Allen Wrench. It doesn't not have a micrometer or something to easily repeat changes. I do tend to go 1/8 turn up or down for 180 vs 200 grams. Your ears can guide you here.

    I do like the ability to change arm cables. I know a lot of folks like one cable from the cartridge clips to the phono stage. But I've found 1 (more) break seems to be trumped by a better cable.

    It's the best arm I've owned for sound quality (vs prior arms like SME IV.Vi, Triplanar, Schroeder LT)
    Speakers: Rockport Altair 2
    Amps: Nagra HD Pre Amp & HD Amps
    Cables: Transparent Magnum Opus speaker and interconnects
    Power Transparent Opus Power Cords & Opus Isolators
    Digital dCS Vivaldi full stack w/ Transparent Reference XL Digital cables
    Phono: Grand Prix Monaco 2.0 TT, Spiral Groove Centroid, Clearaudio Goldfinger Statement, Nagra Classic Phono & PSU
    Racks: Grand Prix Audio Silverstone F1 (x4)

    Comment


    • #4
      Originally posted by MylesBAstor View Post
      Know a couple of members have experience with Allen's arm. I've always respected his work but that oil bath and changing heights and tracking force has always intimidated me. Would love to know more about the Centroid arm!
      I've been using the RPM-2 which pre-dates the Centroid (both uni-pivots), it was Fremer's reference on the Simon Yorke 'table before he acquired the Caliburn/Cobra table/arm. the major change on the Centroid was the counter balanced weight right on the pivot giving the 'arm the lowest moment of inertia possible. Allen was granted a patent for this. the pivot point on both arms is on the same horizontal plane as the LP surface (which doesn't change with VTA like most arms) and is immune to warp wow, AFAIK the RPM-2 was the first American arm with this design. The RPM-2 immerses the bottom of the bearing cup in an oil bath as an integral part of its design, the Centroid doesn't. damping is adjusted by adding or subtracting oil (Mobil 1, 5W) easy enough using a syringe. tracking force uses a thumb wheel like the Centroid.

      The coup de gras is the set-up jig (also patented) which is the same jig for both arms. The hole locates the spindle to pivot distance and the vertical rods locate the arm wand, tangency is insured and the stylus target and reference lines on the mirror provide the correct overhang and zenith. I can install a cart, balance it and get it close to ideal in 10 mins. About as quick as Bob's jig for the Phantom.



      Last edited by Rob; 05-03-2016, 10:30 PM.
      Simon Yorke + MSL > B.M.C .> Valvet > Linear Tube Audio > Avantgarde

      "Listening to Analogue music is an act of rebellion in a digital gulag" - Simon Yorke

      Comment


      • #5
        What is that gooey looking mung on the back of the bearing housing Rob?
        Micro Seiki SX-8000 table with flywheel, SME 3012R arm, SME 312S arm, Lyra Etna SL and Dynavector XV-1S cartridges, ARC Ref 3 phono stage, Otari MX-55 tape deck, Ampex 350 repros, Roon Nucleus Plus server, PS Audio DSJ DAC, ARC Ref 6 pre, ARC Ref 75 amp, JBL 4345 speakers, and Def Tech Ref subs.

        Comment


        • #6
          sharp eye! Its a rubbery substance used to decouple the counter balance beam from the body the tonearm . the beam will wobble slightly when applying force to it. If you recall your ET-2 was decoupled in a similar way, Ed Thigpen used a flat spring at the end of the bearing tube where the counter weight beam attaches.
          Simon Yorke + MSL > B.M.C .> Valvet > Linear Tube Audio > Avantgarde

          "Listening to Analogue music is an act of rebellion in a digital gulag" - Simon Yorke

          Comment


          • #7
            Originally posted by Rob View Post

            I've been using the RPM-2 which pre-dates the Centroid (both uni-pivots), it was Fremer's reference on the Simon Yorke 'table before he acquired the Caliburn/Cobra table/arm. the major change on the Centroid was the counter balanced weight right on the pivot giving the 'arm the lowest moment of inertia possible. Allen was granted a patent for this. the pivot point on both arms is on the same horizontal plane as the LP surface (which doesn't change with VTA like most arms) and is immune to warp wow, AFAIK the RPM-2 was the first American arm with this design. The RPM-2 immerses the bottom of the bearing cup in an oil bath as an integral part of its design, the Centroid doesn't. damping is adjusted by adding or subtracting oil (Mobil 1, 5W) easy enough using a syringe. tracking force uses a thumb wheel like the Centroid.

            The coup de gras is the set-up jig (also patented) which is the same jig for both arms. The hole locates the spindle to pivot distance and the vertical rods locate the arm wand, tangency is insured and the stylus target and reference lines on the mirror provide the correct overhang and zenith. I can install a cart, balance it and get it close to ideal in 10 mins. About as quick as Bob's jig for the Phantom.



            Thanks for the detailed info Rob. I must have been thinking about the original arm.
            Myles B. Astor, PhD, Administrator
            Senior Editor, Positive-Feedback.com
            ________________________________________

            -Magico S5 Mk.2 speakers with SPod feet
            -Goldmund Telos 280 stereo amp
            -Goldmund Mimesis 37S Nextgen preamplifier
            -Doshi V3.0 phonostage
            -VPI Vanquish direct-drive turntable
            -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
            -Lyra Atlas SL Lambda, Fuuga, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
            -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
            -Assorted cables including Transparent XL Gen. 5, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords
            -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA platforms.

            Comment

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