AT8681

UniMix® 2-to-1 Microphone Combiner with Balance Control

MSRP* US$77.00
Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.



  • Overview
  • Features
  • Specifications
  • Downloads
  • Reviews
  • Q & A

  • Overview

    The AT8681 combines the output from two microphones into one channel. The balance control attenuates each microphone by 6 dB (typical) at midpoint.
  • Features


    • Professional XLR-type input/output connectors

    • Can be installed anywhere in-line, either at the mixer input or near the microphone

    • 24-48V DC phantom power and balanced cables required for operation

    • Permits phantom voltage to pass on to the microphone

    • Rugged steel housing

  • Specifications


    Input/Output Connectors XLRF/XLRM-type
    Phantom Power 24-48V DC, 2-4 mA typical
    Frequency Response 20-20,000 Hz
    Gain Unity (0 dB), +0/-1.5 dB
    Noise (A-Weighted) -115 dBV typical
    Weight 8.8 oz (250 g) typical
    Dimensions 5.12" (130.0 mm) W x
    2.36" (60.0 mm) D x
    1.73" (44.0 mm) H typical
    Input Impedance 10,000 ohms
    Output Impedance 250 ohms
    Maximum Input Level +15 dBV (1% T.H.D. at 1 kHz)
    Maximum Attenuation 33 dB at 1 kHz
    Notes UniMix specifications measured at 48V phantom power, 150 ohms input load and 100,000 ohms output load.



    Conditions
  • Downloads

    AT8681, AT8684 Specification Sheet (pdf 67.22 KB)
    AT8681 Submittal Sheet (pdf 135.53 KB)
  • Reviews

  • Q & A

    Do you have questions about this product?

    Get answers from real customers and in-house experts with AnswerBox.

    9 Questions | 9 Answers
    Displaying questions 1-9
    • Q:

      We're using two identical condensor mics at our pulpit, requiring two channels/two cables. Will this effectively combine the two signals to one channel, eliminating additional cabling, etc.?
      Asked on 10/5/2016 by Christopher from United States

      1 answer

    • Q:

      If one input is connected to a mic with an on/off switch, and that switch is moved to the 'off' position, will the volume of the second mic jump?
      Asked on 7/12/2016 by Chris from United States

      1 answer

      • Staff Reviewer

        A:

        It will not make the volume jump, the channels are separate.

        Answered on 7/19/2016 by ATUS_Specialist4
    • Q:

      Want to combine line level Stereo outs on a church organ and feed to mixing board. It does not like to have the channels combined and causes distortion. Are the inputs isolated and can the unit accept line level signals?
      Asked on 5/2/2016 by Lonnie from Tennessee

      1 answer

      • Staff Reviewer

        A:

        Please contact our Audio Solutions Department at (330) 686-2600 ext 5000 or at audio-solutions@atus.com for assistance with this.

        Answered on 5/3/2016 by ATUS_Specialist3
    • Q:

      I'm using the AT8681 UniMix to mix 2 mics, each placed on a seperate guitar cabinet.(i've run out of inputs on my desk)
      I've only used it once and seemed to preform well.
      Do you think its ok to use it in this manner.
      Asked on 8/6/2015 by Dunk58 from United Kingdom

      1 answer

      • Staff Reviewer

        A:

        Thank you for your inquiry.

        Yes, this setup is one example of using the AT8681 as an audio tool.

        Answered on 8/11/2015 by AudioSolutionsSpecialist3
    • Q:

      Will the AT8681 unit work as a completely passive mixer?

      Will the AT8681 work properly if the amplifier (or mixer) audio mic input does not provide phantom power? (my two microphones do not need phantom).
      Asked on 7/27/2015 by sugarglider from United States

      1 answer

      • A:

        No it will not. The AT8681 2-to-1 Microphone Combiner requires phantom power (24 to 48V DC is acceptable) to operate. It also passes phantom power on to the microphones connected to it. Your microphones may not need phantom power, but they should also function without any problem if phantom power is applied. The exception would be a ribbon type microphone. Do not send phantom power to a ribbon type microphone unless it is stated specifically that phantom power is required.
        If the amplifier or mixer does not provide phantom power, you would need to install an inline phantom power supply to make the Combiner work. An example of this would be our AT8801 Single-channel 48V Phantom Power Supply.

        Answered on 7/28/2015 by AudioSolutionsSpec1 from Stow,OH
    • Q:

      For simple live mic mixing..?

      I'm using an AER Compact 60/2 acoustic amp for small live gigs (restaurants/coffee houses/etc). It's a 2 channel amp, one for guitar, one for vocal. Occasionally, I have a need to add a second mic into the mix for an additional guest singer that I perform with and rather than lugging a mixing board around, I'm wondering if this will allow me to just mix the two mic signals together into the one mic input of the amp? I'm not worried about eq or effects as the amp will handle that, but i want to be able to blend the volume of the two mic signals so that they are balanced (I'm a bit louder than the other singer). Will this do what I need it to?
      Many thanks!
      Asked on 4/21/2015 by britmat from United Kingdom

      1 answer

      • A:

        Yes, it sure will.

        Answered on 4/24/2015 by AudioSolutionsSpec3
    • Q:

      Will a phantom power in the output power both input microphones? Only one of them or none?

      If I engage phantom power will the microphones get it?
      Asked on 10/27/2014 by jordileft from Barcelona

      1 answer

      • A:

        Yes, the AT8681 UniMix Microphone Combiner does pass the phantom power provided to it on to both microphones.

        Answered on 10/29/2014 by AudioSolutionsSpec1 from Stow,OH
    • Q:

      What can I expect when tracking cello with a ATM350 and a piezo mic comined with the AT8681?

      Will sending it out to the mixer engaging the phantom power effectively power the condenser microphone? Can I expect phase issues with this type of setup?
      Asked on 8/20/2013 by antistudios from Canada

      1 answer

      • A:

        Pending Moderation
        Thank you for your inquiry. Using both a piezo and condenser microphone is quite common with string instruments, particularly guitar and upright bass. I'm not sure of the requirements for connecting the piezo to the Unimix.

        Answered on 8/21/2013 by AudioSolutionsManager from Stow, OH
    • Q:

      Will using 2 mics via AT 8681 require an additional inline phase switch on one when used with the focusrite ISA Pre?

      Second question about using AT mic combiner with ISA 1pre-amp. Pre has a phase reversel switch, but won't this change phase on both mics if combined together? Will I need an inline type device on one mic before it in enters the combiner?
      Asked on 11/28/2012 by guthstew32 from Kansas City, KS, USA

      1 answer

      • A:

        Great question. The phase/polarity switch on the ISA-1 would flip the polarity of both microphones. However, the phasing between the microphones will be more-so related to the microphones placement (relative to the other microphone and the sound-source) than it will be to the electrical circuit of the AT8681. Also, since the AT8681 is a microphone combiner, you will not get a stereo image from the two microphones. If you believe there is a phase issue between your two microphones, you would need to get a polarity inverter (sometimes incorrectly labeled as a "phase" inverter) to correct for this issue. However, careful selection in microphone placement (X/Y or 3:1 Rule) should balance out the phasing properly which should reduce the need for a polarity inverter.

        Thanks!

        Answered on 11/30/2012 by AudioSolutionsSpec2 from Stow, OH
    Displaying questions 1-9

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