Acouswitch Jr

The Acouswitch Junior is a compact multi-functional Preamp/DI for musicians who perform on stage with electric as well as with acoustic guitars and wish to use the same effects for both with a single pedal board. With two separately controllable high impedance inputs it becomes the control center for your electric/acoustic setup. The Acouswitch Jr sports programmable foot switches allowing the user to decide on the signal routing for the inputs, outputs and to control the loop functions.

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Acouswitch Jr



Programmable Input Switcher

The Acouswitch Junior offers two high impedance inputs with discrete circuit design. If you connect two instruments to input A and B, the A/B footswitch allows you to toggle between the two. If no cable is connected to Input B, the signal from Input A can be routed to channel A or channel B. Where and how your signal is routed depends on the selected operating mode. In classic mode the selected input is always routed to both outputs, in electro/acoustic mode the outputs are are alternately muted depending on the selected instrument input. In teachers mode you can toggle between between input A+B and input B only.


High -end preamp with-4 band EQ specifically designed for acoustic instruments

Channel A of the Acouswitch Junior features a high-end preamp and an easy and intuitive to use 4-band EQ designed for acoustic instruments and featuring bass, low-mids, high-mids and treble controls.


Programmable Loop/Boost/Mute Switcher

The Acouswitch Junior features a second programmable footswitch that allows you to either control the FX Loop, to engage the Clean Booster, to engage the FX Loop and the clean booster together or to mute the Acouswitch Junior outputs.


Clean Booster

The Acouswitch Junior features a second gain stage with volume control. Depending on the operating mode chosen for the programmable Loop/Boost/Mute switch, this gain stage is either active all the time or controlled by the foot switch. Controlled by the foot switch it serves either as a clean booster in the FX Loop or as a standalone clean booster. Continuously engaged it allows to adapt the output to all possible situations including driving a power amp, a powered monitor or an in-ear system.


DI box

The Acouswitch Junior can be used to send an output signal directly to a mixing console or a recording unit. The high-quality components and features of the Acouswitch IQ DI (high-end preamp, ground switch, pre / post signal processing switch) in combination with major parts of the Lehle True Sound technology make it an excellent DI box, be it in a live setting or in a recording situation.

Technical specifications

Seize and weight

  • Weight: 1,065 gr
  • Lenght: 15 cm (5.9”)
  • Width: 16 cm (6.3”)
  • Overall height: 4,3 cm (1.7”)


  • Voltage range: 9-15V DC or 7-12V AC
  • Power consumption: max. 150 mA



  • Frequency range: 50Hz (Low-cut-Filter) –100 KHz (+0/-2 dB)
  • Distortion: <0,005%
  • Input A impedance: 5 MΩ
  • Input B impedance: 5 MΩ
  • Send impedance: 250 Ω
  • Return impedance: 50 KΩ
  • Output impedance: 250 Ω
  • Signal-to-noise ratio: -94 db @ 1kHz, 0dBu (22 Hz -22 KHz)


  • Max level: 5V RMS (approx. 16 dBu)
  • Max gain: +/- 15 db
  • Bass: +/- 15 db @ 80 Hz (peaking)
  • Low Mid: +/- 15 db @ 360 Hz (peaking)
  • High Mid: +/- 15 db @ 2 KHz (peaking)
  • Treble: +/- 12,5 db @ 10 KHz (shelving)


  • Guitar Acoustic
    Guitar Acoustic - 01/2016

      Young Beats Old
      The concept of the new Acouswitch Junior is simply ingenious!
      […] the four-band EQ sounds absolutely good.
      (read the whole review)

  • Bass Quarterly
    Bass Quarterly - 02/2016

      Sounds excellent!
      The unit design and the setting options are very intuitive and musician-friendly.
      The Lehle RMI Acouswitch Junior is a compact, highly efficient switcher with a wide variety of applications.
      (read the whole review)

  • Bonedo
    Bonedo - 02/2016

      Multifunction Tool For Acoustic And Electric Instruments
      A top quality tool, that performs various tasks and can also combine them. Whether you want to use this device as a DI-box, an A/B-switcher for two different instruments in your live-routine, as an EQ or a clean booster - all these tasks are mastered with flying colors by the Acouswitch Junior pedal.
      Highly recommended!
      (read the whole review)

  • Gitarre&Bass
    Gitarre&Bass - 04/2016

      Flexible Problem Solver
      This flexible problem solver convinces with its robust „die-hard“-construction, highest sound quality, timeless design and various possibilities to realize individual requirements with a minimum of stress. Clearly, we recommend all demanding live-musicians to check it out.