Hear Technologies Freedom Back
Wireless Stereo In-Ear System


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The Freedom Back is a high quality UHF wireless stereo in-ear monitor system designed to replace loud, bulky and unsightly stage monitors while allowing the talent the freedom to move about the stage. It is a perfect companion to our highly successful Hear Back personal monitor mixer system and the acclaimed Mix Back matrix monitor mixer.

The Freedom Back system includes a transmitter with antenna, wireless stereo receiver, carrying case, and rack mount kit with an extension cable for mounting the antenna on the front panel. Freedom Back is available in UA and UB bands making it possible to utilize numerous units on a stage at one time. Band A operates from 584 – 608 MHz and band B operates from 655 – 679 MHz. With 120 channels per band, the user will be able to select frequencies that will not be subject to local TV station interference.

Hear Technologies Freedom Back Features:

  • Transmitter:
    • 120 digitally selectable UHF channels
    • Up to 10 transmitters may be used in the same space, depending on local UHF interference
    • Stereo or Mono switch on the rear of the transmitter
    • Back-lit LCD display of frequency, audio level, group and channel
    • XLR and 1/4 ” combo input connectors
    • Built-in automatic limiter
    • Stereo headphone or in-ear monitor jack with volume control
    • PAD switch attenuates signal by 12 dB
    • External whip antenna can be front mounted with included rack ears and extension cable 
  • Receiver:
    • Wireless stereo belt pack allows freedom to move about the stage
    • Unlimited receivers may be used with one transmitter, when on the same frequency
    • Back-lit LCD displays frequency, group, channel, battery indicator, and Mono/Stereo
    • Stereo headphone or in-ear monitor jack with volume control
    • RF present LED
    • Batteries included 

Hear Technologies Freedom Back Specifications:

  • Overall System:
    • Operating Range:  330 ft (100 m) line of sight, under typical conditions
      • Note:  Actual range depends on RF signal absorption, reflection, and interference.
    • Frequency Response (+/- 3 dB):  40 Hz - 16 KHz
    • Total Harmonic Distortion (+/- 30 KHz deviation, 1KHz tone):  <1%  
    • Dynamic Range:  >90 dB A-weighted  
    • Operating Temperature Range:  -10°C to +50°C
    • Note:  Battery characteristics may limit this range 
  • Transmitter:
    • Max Audio Input Level:  +6 dBV, +18 dBV with -12dB PADengaged
    • Gain Adjustment Range:  60 dB
    • Input Impedance:  10k Ohms unbalanced, 20k Ohms balanced  
    • Physical:  
      • Dimensions:  1.5” H x 8.35"(W) x 3.78"(D)
      • Weight:  1.34 lbs (0.6 kg)  
    • Power Requirements:  12 - 18 VDC at 300 mA, supplied by external power supply  
    • LR Input:  Balanced
      • Pin 1 = Shield
      • Pin 2 = + Audio
      • Pin 3 = - Audio  
    • TRS Input:
      • Tip = + Audio
      • Ring = - Audio
      • Sleeve = Shield  
  • Wireless Stereo Receiver:
    • Audio Output Level:  100 mW
    • Sensitivity:  -94 dB for 30 dB SINAD, typical
    • Image Rejection:  >55 dB
    • Physical:
      • Dimensions:  3.74"(H) x 2.56"(W) x 0.98"(D)
      • Weight:  3.52 oz (100 g) without batteries  
    • Power Requirements:  2 “AA” size Alkaline orrechargeable batteries  
    • Battery Life:  Approximately 4 ~ 5 hours (alkaline), load and level dependent  

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