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Alpine KCA-121B Auxiliary Input Adapter

Converts the changer port on Alpine stereos to an aux input

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  • Alpine KCA-121B Auxiliary Input Adapter

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Our take on the Alpine KCA-121B Auxiliary Input Adapter

by Charlie Pastorfield
Alpine
Alpine Authorized Online Dealer

The KCA-121B auxiliary input adapter allows you to convert the Ai-Net changer port on your Alpine stereo into an audio auxiliary input. One end of the adapter connects to your changer port, and the other end gives you a pair of female RCA jacks. Once connected, you can select the AUX source on your stereo and utilize the Bass Engine® sound-shaping functions to personalize the playback. 1-year warranty.

Note: When using the KCA-121B, a CD changer cannot be connected to the stereo; the KCA-801B auxiliary input adapter allows you to connect an auxiliary source and an Ai-NET changer to the stereo. The KCA-410C Versatile-Link™ Terminal allows you to feed audio from up to two auxiliary sources and two Ai-NET CD changers to the stereo.

See All Car Stereos that work with this item See more info on this item

Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.

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What's in the box?

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  • AI-Net to RCA adapter

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Overview: The KCA-121B allows you to adapt the CD changer input of AI-Net controlling head units to RCA (aux) inputs. When using the KCA-121B, a CD changer cannot be connected to the receiver.

 
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Alpine KCA-121B Auxiliary Input Adapter Reviews

Average Customer Review:

47 people say:

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5 out of 5

Alpine KCA-121B auxiliary input adapter

Written By Terry Blue, Atlanta, Ga on Tuesday, July 29, 2014
Crutchfield Customer Review (What's this?)
 
I really enjoy the Alpine KCA-121B auxiliary input adaptor. Makes it very easy fir me to listen to music from external devices with ease.
Pros:
Very easy to install. Simple!!
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5 out of 5

KCA-121B

Written By Boz, Memphis, TN on Thursday, July 03, 2014
Crutchfield Customer Review (What's this?)
 
Works like a champ. Combined with my new Metra Mini-to-RCA Cable it Lets me play MP3's from my android cell phone straight through my head unit. It was a little confusing to set up since I could not find owner's manual but I fumbled through it. Can't believe I waited so long to buy it.
Pros:
Lets you conect any RCA input into your older AI-Net equipped Alpine head unit
Cons:
A little hard to configure head unit to play from auxiliary.
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By thumper, nashville, tn on Monday, June 16, 2014
Crutchfield Customer Review (What's this?)
 
Worked great no problems what so ever
Pros:
Cheaper than at most retail stores
Cons:
Non
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5 out of 5

Perfect

Written By P, Boca Raton, Florida on Monday, February 03, 2014
Crutchfield Customer Review (What's this?)
 
Awesome! Exactly what I needed to put in the back of my radio for my xm sirius radio to work with all my speakers, thank you Crutchfield!
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5 out of 5

KCA-121B

Written By bpet, lynnwood,wa on Thursday, January 16, 2014
Crutchfield Customer Review (What's this?)
 
Had troubles finding the aux input settings for my alpine cda-105, called Customer service and had it squared away in 10 minutes. This was not a plug and play piece. You HAVE to go into settings to turn it on.
Was this review helpful?    Yes | No
 
5 out of 5

kca121b aux input

Written By askieyazhi, seattle,wa on Tuesday, January 14, 2014
Crutchfield Customer Review (What's this?)
 
Just plugged into the back of my alpine receiver and turned on the aux input. It was up and working, no problems.
1 out of 1 people found this helpful
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Brent S, Fresno, CA on Tuesday, November 12, 2013
Crutchfield Customer Review (What's this?)
 
Works great!!
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5 out of 5

Like a charm

Written By Glenn, Jacksonville, NC on Monday, October 14, 2013
Crutchfield Customer Review (What's this?)
 
Unfortunately, this adapter works like a charm on my 5 year old CDA-9884. All I wanted to do is stream a little music from my iPhone once in a while and still keep my iPod connected as my main music source, and this was the simple cost effective solution. I had my eye on a new Alpine head unit, but what's the point now.
Pros:
It works.
Cons:
No justifiable reason to upgrade stereo.
3 out of 3 people found this helpful
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5 out of 5

Alpine aux in

Written By MMM, Scottsdale, AZ on Friday, September 13, 2013
Crutchfield Customer Review (What's this?)
 
Bought one from another online store first and did not work. This Alpine products performs very well.
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5 out of 5

Great Aux adapter

Written By JohnnyZ, Haltom City, Tx on Tuesday, September 10, 2013
Crutchfield Customer Review (What's this?)
 
Glad I found this adapter for CDA-9811, as I was about to purchase new radio for auxiliary port. Gave new life to my aging radio, now I am able to play music through my phone and cut back on cd's.
Pros:
easy install; fits great and works great.
Cons:
would be nice if rca leads were longer; but still great.
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5 out of 5

input adaptor

Written By postbl, gowanda, ny on Thursday, July 18, 2013
Crutchfield Customer Review (What's this?)
 
the part worked perfect, but i had to remove the radio again to be sure it was plugged in properly at rear of the radio. i purchased it because the i-pod wasn't compatible with the radio.
Pros:
it works just how its supposed to.
Cons:
none
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Anonymous, Greer, Sc on Monday, July 15, 2013
Crutchfield Customer Review (What's this?)
 
Great cable works as advertised
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5 out of 5

Great product.

Written By Anonymous, Rochester, WI on Friday, June 28, 2013
Crutchfield Customer Review (What's this?)
 
Picked this up for an upgrade on my 9856 that I picked at a boneyard for $35. I tried using the jacks provided on the back of the stereo, but they didn't work for my Mp3 player. Plugged this guy in, and now I have beautiful Alpine sound from a mediocre Mp3 player.
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5 out of 5

Versatile adapter

Written By Fivegs, Wind Lake, WI on Sunday, May 26, 2013
Crutchfield Customer Review (What's this?)
 
This adapter works just as it should! Nice upgrade!
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4 out of 5

helpful product for connectivity

Written By Scott H, St. Louis on Tuesday, May 21, 2013
Crutchfield Customer Review (What's this?)
 
Works well. Gave it four stars only because it only comes in rca female jacks. I had to adapt it to a 1/8 inch female jack in order to play my music. Without an input on my alpine 9847, this adapter allowed me to continue using this deck. The deck does not recognize this input automatically. You have to go into the menu and activate the auxiliary input. Once completed, the aux input is available without having to go back into the menu going forward.
Pros:
Inexpensive and allows me to connect my phone and iPod.
Cons:
RCA jacks, needs cable to bring input to the front of the dash.
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4 out of 5

Needs instructions

Written By Jim, Idaho on Monday, April 15, 2013
Crutchfield Customer Review (What's this?)
 
Would give 5 stars, but had to do an internet search to figure out how, beyond plugging it in, to get it to work with my head unit. Works great!
Pros:
Works as advertised
Cons:
There are set-up steps to get it to work and no instructions.
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4 out of 5

Alpine Auxiliary Input Adaper

Written By JohnH, Overland Park, KS on Tuesday, April 02, 2013
Crutchfield Customer Review (What's this?)
 
It was a smiple aux cable needed to play my music from my Iphone and works flawlessly.
Pros:
Simple connection that needed a screwdriver and some patience
Cons:
It took a little time and some careful prying and the reassemble.
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Doug, Cambridge,MN on Sunday, March 31, 2013
Crutchfield Customer Review (What's this?)
 
works great for the ipod
Pros:
great product, cheap
Cons:
none
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5 out of 5

alpine kca-121b

Written By mad-rev, weare N.H on Friday, November 23, 2012
Crutchfield Customer Review (What's this?)
 
Great product
Pros:
Works like it should nice clean sound
Cons:
None
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5 out of 5

Cheap and easy way to connect your MP3 player!

Written By SaabaruJr, Philadelphia, PA on Sunday, June 17, 2012
Crutchfield Customer Review (What's this?)
 
I had a KCA-420i iPod/iPhone adapter that was very cumbersome to use with my Alpine CDA-9833. The Apple interface is so much easier to navigate music/playlists than the Alpine headunit.
Pros:
Cheap!
Cons:
Needs a mini-stereo to RCA for most likely applications.
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4 out of 5

works great on my CDA-9827

Written By Rob, Windham, NH on Monday, April 30, 2012
Crutchfield Customer Review (What's this?)
 
I use this to connect a SiriusXM Radio to my CDA-9827. Works great! I had to also order a mini to RCA adapter cable. Plugeed it all in, enabled the AUX port through the f/setup button and its crystal clear. No more static using the FM transmitter!
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5 out of 5

Perfect Fit

Written By Paco, North Miami,FL on Wednesday, February 08, 2012
Crutchfield Customer Review (What's this?)
 
Perfect fit. I love it. I use it everyday. I ordered the 6ft plug to go with it so my daughter can plug her dvd player to my sound system. I use it with my smart phone and ipod. Sounds clear. I'm happy I didn't have to buy a new radio. I love my radio.
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Darrell, Paris, KY on Wednesday, March 09, 2011
Crutchfield Customer Review (What's this?)
 
Easy way to get my wife's laptop's audio coming over the speakers. Crutchfield
is such a pleasure to work with and their products are tops.
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4 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By B.A., Seattle, Wa on Sunday, January 30, 2011
Crutchfield Customer Review (What's this?)
 
Pretty straight forward, and simple. Did what it advertised, can't ask much more. Could be
cheaper, but I suppose you get what you pay for.
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5 out of 5

You get what you see!

Written By Vik, Long Beach, CA on Thursday, October 01, 2009
Crutchfield Customer Review (What's this?)
 
You get what you see explains all!
The cable on Crutchfield website were cheapest among all the competitor went I bought from them. They were brand new, worked absolutely fine after installation.
I do a lot of online shopping and my experience is not always pleasant with online shopping site but I will highly recommend this Crutchfield website based on my past experience.
Keep up the good work guys!
1 out of 1 people found this helpful
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5 out of 5

Alpine KCA-121B

Written By Charles, Phoenix, AZ on Sunday, April 19, 2009
Crutchfield Customer Review (What's this?)
 
Just plug in and it works great, thanks
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4 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Ryan, Oregon on Tuesday, April 07, 2009
Crutchfield Customer Review (What's this?)
 
This works as advertised. I use it to run my XM Satalite radio.
1 out of 2 people found this helpful
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5 out of 5

Excellent

Written By 245Dad, Edmonds, WA on Monday, January 26, 2009
Crutchfield Customer Review (What's this?)
 
Used this with my Alpine CDA-9884. Works perfect. The head unit came with an iPod adapter that allows me to charge and control my iPod with the head unit itself. The KCA-121B also gives me the option (with an adapter cable) to control my iPod from the iPod itself (although it won't charge at the same time). Great when you have a passenger who wants to "drive" the music without trying to learn how to use the head unit. Works flawlessly.
4 out of 4 people found this helpful
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5 out of 5

AWESOME Cable

Written By coolio1729, Kentucky on Friday, November 28, 2008
Crutchfield Customer Review (What's this?)
 
The Alpine auxiliary input adapter cable is a 5-star purchase. My uses for it are twofold - cell phone and iPod. I decided to also purchase a 6 foot generic 3.5mm mini-stereo male to two RCA male speaker cable. I connected the female RCA ends of the auxiliary input adapter to the male RCAs of the speaker cable. Now, I use the 3.5mm male plug to connect to my cell phone or iPod.

I recently upgraded my cell phone to the new HTC Touch Pro. After downloading the latest audio/video podcast, I connected the phone to the 3.5mm male plug (through a separate HTC adapter) and bingo, all of the audio was broadcast through the stereo. This capability is killer and the sound is great!

I also use the 3.5mm plug to connect to my iPod shuffle. Again, the sound is great! Any audio device that has a headphone jack can be connected to the stereo with the auxiliary input adapter and additional cable that I mentioned above.

In sum, this auxiliary input adapter expands the capability of your Alpine radio. It was also easy to install.
11 out of 12 people found this helpful
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5 out of 5

Works as advertised

Written By Jose, Chesapeake, VA on Tuesday, September 23, 2008
Crutchfield Customer Review (What's this?)
 
Product works as advertised and consumer installation is very simple. Excellent customer service.
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5 out of 5

For Sat Radio and Alpine head unit

Written By Christopher, Plano, TX on Monday, September 08, 2008
Crutchfield Customer Review (What's this?)
 
This was a must have if you want to use your aux input on the back of the head unit. Quick to install and gave mush more flexibility to my jeep.
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5 out of 5

Works with my Zune

Written By DigitalMan, Lancaster, PA on Saturday, August 30, 2008
Crutchfield Customer Review (What's this?)
 
After getting a Zune and wanting to play it through my car stereo I thought I was going to have to get a new receiver. Luckily though a rep at Crutchfield.com determined my current Alpine player had an aux port in the back and found the cables I needed to make it work. This part along with the PAC SNI-1 and Monster Mini Stereo - Dual RCA cables allows me to play my zune with no problems though my car. I was able to install it myself with the simple instructions that came with the shipment.
3 out of 3 people found this helpful
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4 out of 5

Works

Written By Mike, Syracuse, NY on Sunday, August 03, 2008
Crutchfield Customer Review (What's this?)
 
It did what it was supposed to do. I do wish there were more options, like longer, or to 1/8" female. But it did what its supposed to do.
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5 out of 5

Excellent

Written By lopro_319, NW Burbs, Il. on Thursday, January 24, 2008
Crutchfield Customer Review (What's this?)
 
I ordered 2 of this since i have 2 older alpine H/U namely a cda9807 and a cda7977. I ordered the said item on the 22nd and got it today... dang super fast shipping. It works like a charm when i hooked it up with a monster power adapter to my 30gb ipod video and 8gb iPhone. What can I say... I'm a happy customer with Crutchfield even though the price is a little higher with other online retailers. Thanks again!!!
1 out of 1 people found this helpful
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5 out of 5

Perfect

Written By HorsySce, Auburn, MA on Monday, January 07, 2008
 
I used this adapter on my new Alpine IDA-X001 receiver and it works great with the Monster Mini Stereo Dual RCA cable. It fits VERY securely to the CD changer port and is insulated. Very happy with this adapter.
2 out of 2 people found this helpful
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By Chris, Alburtis, Pa on Tuesday, April 24, 2007
Crutchfield Customer Review (What's this?)
 
This item works for both of my Alpine Stereo's. Gives me the best connection possible for my Sirius Satellite radio. Sound quality is awesome.
5 out of 5 people found this helpful
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5 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By memyself, CA on Sunday, October 22, 2006
 
I just thought I should add this little note, I just learned myself, since this pink/black lead is really intendede to MUTE your stereo when getting a phonecall or something of this nature, your stereo is DEFAULT set to 'MUTE ON' in the menu, so you need to set this to OFF after that it works like a charm on my late 90's Alpine unit!! Check your manual how to do this!

Bottom line if you have an AINET input AND a PINK/BLACK lead you should be good to go!

6 out of 7 people found this helpful
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5 out of 5

Works like a charm!

Written By BiggLou55, Nashville, TN on Tuesday, February 14, 2006
 
I got this for my CDA-7894 in the hopes that it would save me from having to upgrade to a new head unit to support my iPod. Well, it works GREAT!!... After connecting everything up, all I had to do was go into the menu and active the Aux port. I also have a Belkin power adapter with an audio jack (w/ volume control) built in. All I have to do is hock the power adapter into the iPod and it's on! I suggest this for anyone who has an older Alpine head unit and want to connect their iPod or other Aux device. All that is required is a 2001+ Alpine with an Ai-net connection on the back (CDA series)...
19 out of 20 people found this helpful
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5 out of 5

Universal connection for your Alpine received

Written By doru, Redmond, WA on Saturday, January 21, 2006
Crutchfield Customer Review (What's this?)
 
I'm using this with CDA-9847. I just went and bought wall mount audio RCA connectors ($2 each). I made two holes in the trim right above the cigarett lighter (I own a Camry 97) and mounted the RCA connectors. I route an RCA cable from the connectors to the Alpine KCA-121B and now I can connect any device that I want. The connectors are oriented downward at 45 degrees, so they are easy to access but not looking intrusive. Now I can connect my MP3 player and my notebook (for my kid in the back, to have good sound not only good picture).
9 out of 9 people found this helpful
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5 out of 5

Alpine Ainet to RCA

Written By James, Rolla, Mo on Monday, December 12, 2005
 
I bought one of these for my CDA9851, and it was a breeze to install and set up. This cheap cable is the reason I bought the 9851, Sony wanted nearly $100 to hook up my laptop to an RCA connection, so wth my new car, I pulled my old sony receiver, and put it in a box. With Monster Cable RCA to mini jack connector, the sound quality is perfect. Another thing that impressed me, is you see what look like covers over the RCA connections in the picture, but they are actually boots to better insulate your connection.
5 out of 5 people found this helpful
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3 out of 5

Alpine KCA-121B Auxiliary Input Adapter

Written By ace, Seattle, Washington on Saturday, December 03, 2005
 
It didn't work with my Alpine MDA-7755.
2 out of 8 people found this helpful
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5 out of 5

Must have Versitile Link or this work-around if unit is pre-2001

Written By David, Dublin, CA on Wednesday, November 30, 2005
Crutchfield Customer Review (What's this?)
 
This part works as long as your reciever is 2001+. It did not work for me and I called alpine. It turns out that you need to have Versitile Link which is on the Ai-net products after 2001. I had a 1999 CDA-D852. The good news is that there is a work around using the audio interrupt lead (pink/black) on the wiring harness. Pass this lead through a switch and ground the other side. When this lead is grounded it tells the reciever to listen to the signal coming from the Ai-net connector. Once you have this hooked up you just flip the switch to listen to your aux. device.
25 out of 27 people found this helpful
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5 out of 5

Works like a Charm

Written By Mike, Leesburg, VA on Thursday, November 10, 2005
Crutchfield Customer Review (What's this?)
 
After buying/using a FM Digital Transmitter for my Ipod, I was thinking I'd be set. I was with the auto charger feature but the radio part didn't statisfy me enough with static noise I was facing. I didn't know I could use such a cheap Alpine cable to use with my Ipod. I bought a Belkin RCA to Portable Audio cable to attach to the Ipod. So far I am using the cable with a 2001 Alpine CDA-7977 w/Ai-Net, I recommend this way versus the radio transmitter.
4 out of 4 people found this helpful
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5 out of 5

Excellent

Written By Jason, Chicago, IL on Monday, September 05, 2005
Crutchfield Customer Review (What's this?)
 
I bought this product to use for my ipod and the quality is outstanding. I would recommend combining this with the Monster iCable for iPod if you're really obsessed with quality. There is absolutely no static and the sound is crystal clear. Do not go cheap and save a couple of bucks, you will be very disappointed. You might as well spend the extra cash and get everything right the first time.
7 out of 8 people found this helpful
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5 out of 5

Excellent

Written By skizzle, Lincoln NE on Tuesday, July 19, 2005
Crutchfield Customer Review (What's this?)
 
I bought this for my 2004 Alpine and it's awesome. I think even if you have a 2005, why get that expensive module? This took me 5 mins to hook up and it's the cheapest best way to hook up your ipod. Plus it takes forever to scroll the songs on the Alpine screen. Good buy! always from Alpine.
5 out of 5 people found this helpful
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5 out of 5

Don't Be Fooled

Written By Frank, Roanoke, Va on Saturday, April 16, 2005
Crutchfield Customer Review (What's this?)
 
I first bought a off brand and was not satisfied with the fit or performance. One channel did not work. If you are thinking of going with a outside source instead of a Alpine part, just to save a buck or two, forget it. This piece worked perfectly. I use it for my Skyfi. One other tip. Use the best interconnects you can afford. It does make a differance in sound quality.
22 out of 23 people found this helpful
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4 out of 5

Works Like It's Supposed To

Written By Curtis, Milwaukee, WI on Monday, March 21, 2005
 
I got this so I could hook up my iPod to my CDA-9883 and it works like a charm. The only thing I suggest is buying a high quality audio cable to use with whatever type of player you are hooking up. I went cheap and got a low quality cable. It sounds nice, except that at higher volume levels you hear a lot of white noise in between songs or during quiter parts of songs. That being said, there is no reason not to buy this, and I think it is a better solution for iPod users becasue you can use your iPod controls.
110 out of 141 people found this helpful
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1 question already asked

I have an alpine cda-9884 will this fit my radio? [ gator  Aug 04, 2014 ]
1 answer
  • For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy Staff  Aug 04, 2014 ]

For a more in-depth review and enhanced detailed information on the Alpine KCA-121B Auxiliary Input Adapter, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_500KCA121B/Alpine-KCA-121B-Auxiliary-Input-Adapter.html ).

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