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Audio Theory

Benefits of balanced headphones interconnection

by nihtila
written by nihtila
  • In balanced connection both speakers are individually connected to amplifier using two wires for each channel
  • Crosstalk can be improved by tens of dB by using balanced interconnection
  • Common-impedance coupling seriously limits crosstalk in conventional unbalanced headphones
  • Balanced output can be easily and cost-effectively added on designs; inverted signal is not required
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Modular HP AmpObsolete

HP TPA – Simple IC amplifier board for HP MoBo

by nihtila
written by nihtila

Amplifier daughterboard for HP MoBo modular headphone amplifier

  • TPA6120A2-based simple-IC headphone amplifier amplifier
  • Balanced input, balanced output
  • Jumper link for extra gain option; default 0/10 dB
  • SNR: 116-122 dB A-w depending on the gain and load combination
  • THD+N ratio at 100 mW
    • 300 Ω: 0.0015 % / -96 dB
    • 32 Ω: 0.006 % / -84 dB
    • 16 Ω: 0.009 % / -81 dB
  • Max power around 0.5 W (16 / 32 Ω)
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