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Metra AX-HYKIA-SPDIF Interface

Retains the factory amplifier in 2011-16 Hyundai and Kia vehicles

Item # 120AXSPDIF

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About the Metra AX-HYKIA-SPDIF Interface


You want to install a new stereo in your 2011-16 Hyundai or Kia, but you also want to retain your factory amplifier. Metra's AX-HYKIA-SPDIF amplifier retention interface converts your new stereo's analog output to a digital signal that works with the factory amp. The converter connects to Metra's AX-HYKIA1-SWC or AX-HYKIA1-SWC2 wiring interface (sold separately). Warranty: 1 year.

What's in the box:

  • Digital amplifier retention interface

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Metra AX-HYKIA-SPDIF Interface reviews

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Metra AX-HYKIA-SPDIF Interface

Crutchfield customer from Boston, MA on 8/6/2018

2014 Kia Optima

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Somehow this interface cannot accommodate the "fader" function in a car radio's balance/fade controls. At least not with my Kia Optima. No fade control in my car now. Seems kinda basic for car stereo performance, but not discovered until a complete installation of a new car radio/CD player. Pretty disappointed.



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A frustrating and necessary evil to keep the factory amp/speakers

Aaron from Sweet Briar, VA on 8/3/2018

2011 Kia Optima

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To use the factory amp and speakers in my 2011 Kia Optima with Infinity system, this unit is required. This is actually my second version of this unit having purchased the former model when I first installed my Alpine ILX-107 (wireless CarPlay). The first model had a nasty habit not handshaking with the amp all of the time meaning that you sometimes had to restart the car to reset everything if there was no audio. Once started it was fine, but it was a game of roulette sometimes. It also had an annoying habit of cutting off the first moment of audio in anything that started from silence. A perfect example is Siri saying "Arrived" in the nav system, but it coming out as "rived". After some months, the unit combined with its sister steering wheel interface began turning the audio down on me randomly (truly infuriating). All of my wiring is soldered and heat sealed. I replaced both units and had the same issues. I was about to replace the factory amp with a new model (and face the wiring hassles) to overcome the nonsense. I happened to check and found that this unit and the steering wheel controller had been revised. I've just installed it this evening and, thus far, I'm not having spurious volume changes or failed handshakes at start. Unfortunately, it might take some time to know if this is really resolved and I will post a followup if not. It does still annoyingly clip audio coming out of silence and now no longer has distinct rear channel left/right (combined

Pros: I can hear audio... most of the time

Cons: Clips off the first moment of audio coming out of silence. The jury is out as to whether it's as lousy as the previous model that frequently did not handshake at startup (no audio - restart car) and later began sending spurious volume down signals at random. It also appears to treat rear left/right as part of the front left/right, so setting the fader to rear just lowers the all speakers equally. No win with these units in either generation thus far.

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2 of 2 found this helpful

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More details on the Metra AX-HYKIA-SPDIF Interface

Stacey B.

Product Research


Amplifier Retention Interface (for Hyundai/Kia): The Axxess Integrate AX-HYKIA-SPDIF, in conjunction with the AX-HYKIA1-SWC or AX-HYKIA2-SWC radio replacement interface (sold separately), lets you retain the factory amplifier and factory sub in select 2010-2016 Hyundai/Kia vehicles when replacing the factory radio with an aftermarket head unit.

Note: The AX-HYKIA1-SWC must be used with AX-HYKIA1-SWC or AX-HYKIA2-SWC interface module (sold separately).

Vehicle Compatibility: Compatible 2010-2016 Hyundai & Kia vehicles include -

Make Model Year
Hyundai Elantra 2011-2013
Genesis Coupe (without factory Navigation) 2013-2016
Santa Fe (without factory Navigation) 2013-2016
Santa Fe Sport (without factory Navigation) 2013-2016
Sonata (without factory Navigation) 2011-2016
Sonata Hybrid (without factory Navigation) 2011-2015
Tucson 2010-2015
Kia Optima 2011-2015
Sorento (without factory Navigation) 2014-2016
Sorento with UVO (without factory Navigation) 2012-2013
Sportage 2011-2016

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Customer Q&A

Crutchfield asked: Why did you buy this?
I need it install my aftermarket stereo without bypassing the amplifier [ Ralph  Aug 24, 2019 ]
Need this part to install an aftermarket head unit in my 2012 Hyundai Sonata 2.0T Limited. [ Erik  Jun 28, 2019 ]
To keep factory amp [ stephen  Mar 14, 2019 ]
Because it was required for a nice clean installation and this is for my wife. Remember kids, a happy wife is a happy life. [ Alexander  Dec 20, 2018 ]
i needed this to retain using my amplifier if I didn't i would have had to replace speaker also and I just trying to keep the cost down [ Eric  Dec 08, 2018 ]
it was required and recommended to keep my factory amp [ Rudy  Oct 12, 2018 ]
To help the new radio work with the car [ Brendan  Jun 04, 2018 ]
This part is needed to retain my factory amplifier in my Hyundai Sonata (2011) [ Brian  Jun 01, 2018 ]
because it was recommended in your comments [ Luis C.  Apr 16, 2018 ]

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