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Hear Technologies Hear Back OCTO Personal Monitor Mix System

Steve Savanyu • November 2018Road Tests • November 12, 2018

Originally designed as a “cue-mix” system allowing performers in a recording studio to control what they hear in their headphones, personal monitor mixers have moved out of the studio and onto live stages everywhere. Popular in houses of worship and other performance spaces, personal monitor mixers take the burden off of the FOH engineer by giving performers control of what they hear. Digital technology has made these systems easy to use and affordable — a far cry from the earlier studio cue mix system designs.

Building on the success of the company’s original Hear Back personal monitor system, Hear Technologies has improved its 8-channel Hear Back system while maintaining an easy to operate personal mixer.

A basic Hear Back OCTO system combines a central Hub and one to eight OCTO Mixer controllers.

‡‡         A Little “Back” Ground…

A basic Hear Back OCTO system consists of an OCTO Hub and up to eight OCTO mixers. Each mixer connects to the hub using a standard Cat-5e cable. A set of HearBus ports on the hub allows an almost unlimited number of hubs to daisy-chain together, expanding the total number of eight-channel mixers in a system.

Housed in a single 19-inch rackspace chassis, the hub supplies digital audio and DC power to the connected mixers. Designed to operate from 90 to 264 VAC, the Hub incorporates an internal power supply with a standard IEC power cord. (No unsightly wall warts here!)

The Hub accepts analog audio signals via a DB25 connector (wired in the TASCAM DA-88 analog standard), an optical port (ADAT lightpipe) or the HearBus Port. A front panel switch on the hub selects which input is active and multicolor LEDs on the Hub provide visual indication of input signal level. (I’m seeing more manufacturers using these multicolor LED’s as space-saving replacements for traditional LED bar graph metering as improvements over simple peak signal lights).

Eight “Mixer outputs” on RJ-45 connectors deliver digital audio, ground and DC power to the connected OCTO mixers. A solid-state automatically resettable fuse on each mixer output prevents power supply damage from a shorted cable or broken mixer. Each mixer is home run back to the Hub and up to 200-feet of standard Cat-5e cable can be used between the hub and mixer. Additionally, a HearBus output port sends the audio signals to another hub for system expansion.

Rugged and designed for ease of use, the OCTO Mixers are constructed of UV-stabilized ABS and incorporate a built-in standard (5/8” x 27-thread) mic stand mount. Individual level controls for each of the eight input channels are provided along with a master volume control for the mixer. Capacitive touch buttons with LED status indicators allow odd/even channels to be stereo linked. A bi-color LED indicates HearBus Clock signal presence and a red LED illuminates if the headphones have a shorted connection. Large “scribble strips” on the mixer let users label each input control using dry-erase markers or P-touch-type labels.

The mixer has both 1/4” and 1/8” TRS headphone outputs (no hunting for adapters!), along with a set of left and right line out connectors allowing the mixer to drive powered wedges or IEM transmitter inputs. An aux input connector on the mixer allows a local signal to be inserted into the mixer’s audio stream. (A good example would be a drum machine click track inserted into the drummer’s OCTO Mixer.) The mixer’s built-in headphone amplifier is capable of sustaining 2 watts of power! That means with a pair of popular studio headphones (such as the Audio-Technica ATH-M50x), the OCTO Mixer can drive the headphones to extreme levels which could actually damage someone’s hearing. Or, as I tell performers, you can blow your brains out if you crank them up to too high! (With this in mind, Hear Technologies includes a large warning box in the manual about this very topic!)

Front and rear views of Hub

‡‡         Gig Time With No Setbacks…

I received an OCTO Hub and four OCTO Mixers, along with four Cat-5e cables, power cord and a 10-foot DB25-to-TRS Male interface cable all packed in a nifty nylon “Tote Back” carry bag. The bag has movable dividers that enabled it to hold up to eight mixers, a nice touch…

Set up was quick and easy. Using the DB25-to-TRS cable, I connected channels 1 and 2 to a stereo aux send on my console (overall band mix) and patched channels 3-6 into the direct out connectors on each of my vocal channels. I ran a Cat-5e cable from the Hub to each OCTO Mixer. Since this was more of a live “session” gig in my studio performance space, I gave each vocalist a set of headphones and an OCTO Mixer. After a few minutes of instruction on using the individual channel controls to configure the “mix” and using the master to set the overall headphone level, we were underway.

The gig went smoothly, and all of the users said the OCTO Mixer was intuitive and easy to operate. The only issue we had was when a stereo link button was accidentally touched on mono channels 3 & 4 and the user had no idea why their #4 input level no longer operated…

One of the things I really like about the Hear OCTO system is the simplicity of use for the performer. Unlike some personal monitor systems that offer multitudes of adjustable functions, menu driven parameters and multi-function controls, the Hear OCTO system is simplicity at its best. Pick a knob, turn it, create your mix… It allows the performers to concentrate on their performance without being intimidated by the technology.

I next set the OCTO system up with my DAW interface using the ADAT lightpipe input. Again, setup was quite simple. In fact, it took more time to route the DAW signals to the ADAT output on my interface than to connect and configure the OCTO system. Once I had signal flowing, I experimented with different headphones and earbuds (I have quite a collection…) for some in-depth listening. In all cases, the signal from the OCTO Mixer was clear, clean, detailed and… loud!

The OCTO Mixer has easy-to-use controls and a mic stand mount for convenience.

‡‡         So, What’s the Take-Back?

The Hear Back OCTO system was absolutely one of the easiest to use and set up personal monitoring systems for both myself and the performers using it. Audio performance excelled on a wide variety of headphones and there was no discernable latency.

I liked having both 1/4” and 1/8” headphone connectors on the mixer, and I was not put in a position of needing to supply those ever-disappearing adapters.

For the non-technical performer, the OCTO Mixer’s front panel was intuitive and non-threatening, making it an ideal choice for wide variety of applications. True, it is limited to eight mixable sources (note that each of these can be a subgroup feed, such as keys, drums, horns, etc.) and this may be a limitation to some users, but of course for those applications, the company’s larger Hear Back PRO system fits the bill.

Perhaps best of all, the expandability offered by the HearBus enables the user to grow their system as needed. Start with a few OCTO Mixers, as more as your needs or budget grows.

At a Glance

Personal Monitor Mixing Made Simple

Monitoring solution that brings pro quality fingertip monitor control to bands, churches and other users seeking an improved listening environment to musicians and performers — at a down to Earth price.

Hear Technologies Hear Back OCTO


  • Absolutely easy for performers to use
  • Clean, loud headphone levels
  • Mixers have 1/8” and 1/4” headphone outputs
  • Audio and power to mixers via Cat-5E cabling


  • Easy to accidentally hit the “stereo-link” button on a mixer
  • Ability to daisy-chain the mixers would be nice
  • Eight mixable sources might not be enough for some users


  • Hub Inputs: Eight line sources on standard DB25 connector
  • Line Input Level: +4 dBu optimal, +22 dBu max
  • Outputs to OCTO Mixers: Cat-5E cabling
  • Resolution: 24-bit, 44.1/48 kHz
  • Latency: Less than 1.5 mSec
  • Mixer Size: 5.1 x 9.3 x 2.5 inches
  • Mixer Weight: 15.8 ounces
  • Street Price: System with Hub, four OCTO Mixers, $2,299; individual OCTO Mixer, $349
  • Manufacturer: Hear Technologies
  • More Info:
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