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Old 10-28-2017, 10:18 AM   #1
Bigfx
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Default Easy place to tap front speakers for a sub 2018 wrx base audio?

Hey Guys

Looking to just add an amp and a sub to my 18 wrx with base stereo, I really don’t want to pull the head unit bc it’s looks like a pita. Is there an easy place to just wire tap the front or rear speakers for an loc?
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Old 10-30-2017, 08:03 AM   #2
drewleague
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Quote:
Originally Posted by Bigfx View Post
Hey Guys



Looking to just add an amp and a sub to my 18 wrx with base stereo, I really don’t want to pull the head unit bc it’s looks like a pita. Is there an easy place to just wire tap the front or rear speakers for an loc?


Pulling the headunit is really not that bad, all the speakers are in the door so I don't know how much easier they would be to tap. It took me 20 minutes to get the radio out
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Old 10-30-2017, 11:51 AM   #3
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i did a video on youtube which shows how to pull the radio out....i did it one handed and some people were not liking the nonprofessional filming of it...... but i tried to make it as easy as possible to understand. I can have the radio out in about 8 minutes tops at this point....mine has been out so many friggin times already now. LOL
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Old 11-01-2017, 08:11 PM   #4
NONZILLA
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I'm fairly certain it's an easy task. The headunit is just hiding behind some plastic trim that snaps out, and a couple 10mm bolts. I would recommend doing it this way, it'll be the route with the least amount of problems.
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Old 11-04-2017, 07:23 PM   #5
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Originally Posted by phd12v View Post
i did a video on youtube which shows how to pull the radio out....i did it one handed and some people were not liking the nonprofessional filming of it...... but i tried to make it as easy as possible to understand. I can have the radio out in about 8 minutes tops at this point....mine has been out so many friggin times already now. LOL
Can you link the video?
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Old 11-04-2017, 07:28 PM   #6
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Never mind I found it, I hate the airbag part.
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Old 12-05-2017, 01:56 PM   #7
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The head unit isn't that hard to remove but of course you have a long run of wire. The rear door panels come off in about 2 minutes and allow easy access for tapping into the speaker wire there and then a short wire run to your LOC or high/speaker level input equipped amplifier (Many amplifiers now offer this connection). Of course you would still have to run a wire to trigger the amp remote turn-on. IF ONLY ADDING A SUBWOOFER, I prefer just tapping into the rear speaker wires and not having to add a harness to the OEM radio or splicing into wires in a constrained area.
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Old 04-19-2018, 07:33 PM   #8
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I'd like to do the same on my 2018 WRX premium with 7" Starlink headunit. I read somewhere that this headunit somehow attenuates the bass frequencies from the rear speakers so they don't distort. So does this mean that it's ideal to tap off of the front speaker wires to connect a line level converter for a sub amp?

Also is this the correct speaker pin-outs for the 2018 7" Starlink headunit?

Click on link to see photo:

https://photos.app.goo.gl/n0VRRdB8NIG4uhJ92
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Old 04-25-2018, 01:23 PM   #9
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Quote:
Originally Posted by dricacho View Post
I'd like to do the same on my 2018 WRX premium with 7" Starlink headunit. I read somewhere that this headunit somehow attenuates the bass frequencies from the rear speakers so they don't distort. So does this mean that it's ideal to tap off of the front speaker wires to connect a line level converter for a sub amp?

Also is this the correct speaker pin-outs for the 2018 7" Starlink headunit?

Click on link to see photo:

https://photos.app.goo.gl/n0VRRdB8NIG4uhJ92
Hey dricacho, that link didn't show a picture. In general, the rear speakers are factory tuned to be more likely to provide a wider range of bass frequencies than the fronts. If, however, your system is indeed built to cut the bass frequencies and there's no setting in the HU to allow a full-range of audio signal to the rears, I would definitely hook your LOC up to your fronts. If you run everything and discover there's not much signal getting to your sub, just tag the rear speaker wires instead of fronts behind radio. Easy fix.
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Old 04-25-2018, 01:48 PM   #10
ontariotibv6
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Just wanted to confirm about the front vs rear speakers for information sake. I have the base 6.2 starlink and added a sub and amp only. I first tried tapping the rear speakers for the LOC because it seemed like the easiest location to get to. There was a lot of low frequency missing from the signal to the amp/sub this way so I tried the front speakers for the LOC instead and received the full bass range back, much better sound.
If you have the 6.2 HU, definately use the fronts! As for the 7" im not really sure if this is the case or not.
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Old 04-25-2018, 03:15 PM   #11
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Quote:
Originally Posted by ontariotibv6 View Post
Just wanted to confirm about the front vs rear speakers for information sake. I have the base 6.2 starlink and added a sub and amp only. I first tried tapping the rear speakers for the LOC because it seemed like the easiest location to get to. There was a lot of low frequency missing from the signal to the amp/sub this way so I tried the front speakers for the LOC instead and received the full bass range back, much better sound.
If you have the 6.2 HU, definately use the fronts! As for the 7" im not really sure if this is the case or not.
Same here. Front signal feed the SUB
What I've done also, with Y rca cable, is to feed my Alpine 4x100 PDX-F4 with only the front signal as well. My rear Morel are sounding better.
I slightly use the gain to bias a little bit toward the front.

I have my NEX-4200 waiting to be installed since last fall. I received all the goodies too late and I missed time to do the installation before cold temperature coming.
I will then unplug the Y rca cable
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Old 04-25-2018, 09:33 PM   #12
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man that is super weird. is it only 16-18 Imprezas with starlink that cut the bass to the rears...anyone know?
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Old 04-25-2018, 11:16 PM   #13
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Quote:
Originally Posted by Jolty_eoN View Post
man that is super weird. is it only 16-18 Imprezas with starlink that cut the bass to the rears...anyone know?
SVXdc told me that Clarion HU used to do that...
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Old 04-27-2018, 03:18 PM   #14
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Quote:
Originally Posted by Jolty_eoN View Post
man that is super weird. is it only 16-18 Imprezas with starlink that cut the bass to the rears...anyone know?
Quote:
Originally Posted by BHOD View Post
SVXdc told me that Clarion HU used to do that...
To elaborate: All of the model year 2008-2015 Subaru non-navigation HUs in WRX, STi, and Forester; and MY 2008-2014 Impreza and Crosstrek were made by Clarion and have that issue (they attenuate bass frequencies sent to the rear channels). In all of those HUs, there are secret/hidden menus you can use to flatten the EQ. See this thread and this thread. That 2nd thread has some great pics with frequency response curves.

The 6.2" OEM HUs in 2016-2018 WRX, STi, and Forester are still made by Clarion. So it's no surprise those still have that issue. There's a good chance that they have a similar hidden menu option to flatten the EQ, but I haven't heard from anybody who has found it yet.

The recent OEM 7" HU models (and the 2012-2015 navigation models) are made by Fujitsu Ten. I don't know if any of those have the same issue.

It would be nice if someone could make similar EQ plots for some of these newer models.
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Old 04-27-2018, 04:04 PM   #15
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Quote:
Originally Posted by SVXdc View Post

The recent OEM 7" HU models (and the 2012-2015 navigation models) are made by Fujitsu Ten. I don't know if any of those have the same issue.

It would be nice if someone could make similar EQ plots for some of these newer models.

https://photos.app.goo.gl/wJnKtJTkYSCzvNil1
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Old 04-27-2018, 04:05 PM   #16
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https://photos.app.goo.gl/wJnKtJTkYSCzvNil1


Front left at half volume, full volume on woofer and tweeter

also of note: 2 volt difference between Left and Right, right being the side with more voltage.

Subaru with Starlink - grab front signal AFTER Starlink box below radio. Front speaker passes through the box.

ADDED: wiring diagrams for starlink 7" unit without amp to the album

Last edited by phd12v; 04-27-2018 at 04:18 PM.
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