Home Forums Product Discussion & Questions BeoCenter BeoCenter 2300 AUX input from DAC line-out low volume?

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  • #37126
    ChrisE
    BRONZE Member

      Hi all! Excited to join this forum which I’ve found while looking for a solution to the following curiosity:

      I have recently tried to breathe some new life into a Beocenter 2300 w/ Beolab 8000 by hooking it up to a Topping DX3Pro+ DAC / Headphone pre.

      I have two aux-in cables, one is 3.5mm jack to 7-pin DIN B&O Aux, the other is RCA to 7-pin DIN B&O Aux.

      When I connect the 3.5mm jack to the headphone out of the Topping (Gain 6.0 dB, volume control at 0.0 dB) I get beautifully clear sound, and I can volume-control the setup through either the input device (phone streaming to Topping via BT), the DAC, or the Beocenter.

      However, when I connect the RCA to Aux cable to the Topping’s stereo line out, I get barely audible sound from the Beocenter (at volumes 40+).

      Here’s the question: Is this known behaviour with the Aux inputs of this generation of B&O equipment? i.e., are they better driven from a headphone out than a line-out because of the headphone out’s lower impedance? The other two options would be: faulty RCA to Aux cable (but this one is brand new), or faulty line out on the Topping (which I hope is not the case).

      Thanks a lot for sharing your insights!

      #37127
      Millemissen
      BRONZE Member
        • Flensborg————Danmark

        Some DAC’s have different setting for the output mode.

        Could it be that you’d have to change settings when using either the line out or the hp output?

        MM

         

        #37128
        Guy
        Moderator
          • Warwickshire, UK

          However, when I connect the RCA to Aux cable to the Topping’s stereo line out, I get barely audible sound from the Beocenter (at volumes 40+).

          Are you sure that the RCA to 7-pin DIN cable is wired as an input at the DIN end? (i.e to pin 3 and 5, not 1 and 4)

          #37129
          ChrisE
          BRONZE Member

            Thank you both for your comments!
            The Topping DAC does not allow for different gain settings on the line-out, just for the headphone out which is +6.0 dB (or alternatively +19.0 dB), 5.5Vpp, Output Impedance < .01 Ohm… (according to tech specs).

            Line output is 2.1Vrms @0dBFS at 20 Ohm… Not an expert about these specs; I am not an audio engineer… But my intuition suggests that the levelling between the line out of the DAC and the Aux input of the B&O is off-specs.

            @Guy: Yes, I’ve checked that (at least according to the cable specs). Also I can hear some really quiet audio input on the Beolab 8000 when connecting line to aux. See the cable specs/description from AMZN attached.

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