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Mass Kobo

Mass Kobo Model 433 Headphone Amplifier

Build to order item. Leadtime 3-4 weeks upon order.


  • Model 433 is a full balanced amplifier from input to output. Combining the sound quality that inherits the lineage of the higher model models 406 and 394 with the output circuit of the model 402 used by the Japanese broadcasting station NHK, it will deliver you a nice sound. It has a set of inputs that can be used either with XLR Balance Input or RCA Unbalance Input (Unbalance Input convert to Balance signal by inside amp.). The power supply is AC 100V-240V, 50/60Hz for world wide use. The model 433 has enough power to drive ordinary dynamic headphones.

  • Model : Full Balanced Stereo headphone amp
    Input : Electronically Balanced = XLR3-31 , Unbalance = RCA
    Output : Balance = XLR4-31 , Unbalance = φ6.3 TRS
    Input Impedance : 3.7kΩ (XLR)/ 12kΩ (RCA)
    Reference Input Level : +4dBm or -10dBm (XLR)/ -10dBm (RCA)
    Maximum Input Level : +25dBm (XLR)/ +10dBm (RCA)
    Maximum Output Level
    - (P-P) : Balance = 18.8V (with 32Ω loaded, 1kHz, THD+N 0.05%)Unbalance = 12.2V (with 32Ω loaded, 1kHz, THD+N 0.05%)
    - (RMS): Balance = 6.2V (with 32Ω loaded, 1kHz, THD+N 0.05%) Unbalance = 4.1V (with 32Ω loaded, 1kHz, THD+N 0.05%)
    Maximum Output without Distortion : Balance = 1.2W+1.2W , Unbalance = 500mW +500mW(with 32 ohm load, 1kHz, THD+N 0.05%)
    Frequency Characteristics : 10Hz - 100kHz (-0.5dB)
    Power Supply : AC100 - 240V, 50/60Hz
    Electric Energy Consumption : 0.5A (with AC100V)
    Size : 232mmW x 210mmD x 48mmH (except the rubber feet and projections) 232mmW x 240mmD x 51mmH (including the rubber feet and projections) Weight : 2.4kg (without the power cable)

  • Mass Kobo Model 433 Amplifier x 1
    Power Supply x 1
    Manual x 1