BeoCenter 2300 AUX input from DAC line-out low volume?

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

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  • #37126
    ChrisE
    BRONZE Member
      • Topics Started 1
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      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
        • Topics Started 22
        • Total Posts 1,047

        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
          • Topics Started 14
          • Total Posts 1,241

          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
            • Topics Started 1
            • Total Posts 2

            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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