The HA-5 has built-in overdrive, stereo chorus and stereo short delay functions. There is a microphone jack with a separate volume control. This makes the RH-11M headphones ideal as it has a muilt-in microphone. The Play Bus part of the HA-5 comes from the ability to connect several HA-5 units together. Using a Multiple Jack J-5 as many as 4 people can jam together over the play bus.

HA-5 Headphone Amp, Play Bus

HA-5 Specifications

  • Power: 9V DC (UM-3 x 6), PSA AC Adaptor
  • Input Impedance: Input 470kOhm, Mic 2.2kOhm, Cassette (Line in) 47kOhm, Phones 8Ohm-300Ohm
  • Play Bus input impedance: 10kOhm
  • Dimensions: 90mm (W) x 120mm (H) x 42mm (D) (3.5″ x 4.7″ x 1.7″)
  • Weight: 350g (0.77 lbs.)

RH-11M Specifications

  • Type: Dynamic Open Air Speaker, Dynamic 12ยต polyester film
  • Impedance: 50Ohm
  • Sensitivity:101dB/mW
  • Power Handling Capacity: 100mW (one unit)
  • Frequency Response: 18Hz-22kHz
  • Microphone: Dynamic, differential, bi-directional
  • Frequency Response: 50Hz-20kHz
  • Impednace: 160Ohm
  • Weight:2.4oz without cord, 3.2oz with cord and 2 plugs