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Old 07-25-2021, 01:10 PM   #1
Trudd84
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Member#: 250706
Join Date: Jun 2010
Chapter/Region: South East
Location: Birmingham, AL
Vehicle:
2004 Impreza WRX
WRB

Default Questions about the HK OEM speakers - 2020 STi Limited

Iíve had my 2020 STi Limited for a few months. I know the Harmon Kardon system has 9 speakers. I can visually find 7 of them. My question is, are the front doors a 3 way component set? I can only imagine the last two speakers, that indont where they are, are in the front dash corners, and itís a mid base and a tweeter up there.

The HK system has the:

8Ē Sub - speaker 1
Rear door speakers - speakers 2 and 3
Front door speakers - speakers 3 and 4
Front dash speakers - 6 and 7

I would have to assume that there are 2 speakers, in each dash corner, to make a total of 9. Am I incorrect? I canít find a layout on Google, crutchfield wasnt a lot of help either.

Iím just trying to plan my full system and am trying to figure out what everyoneís doing, whatís/where the OEM speakers I canít find are and besides adding a 10Ē sub and a separate amp, is the a good replacement for the HK 8Ē sub, that could be amped as well, that would be really nice mid bass, to add on top of the 10Ē?

I plan to do full system with DSP, multiple amps, been kicking around the ideal of a 12 on one side of the trunk for lows, a 10Ē on the other side for low kids and playing up to 60-65hz. Hopefully a nice little replacement 8Ē that will work in the OEM spot, and add solid mod bass for crossing your past 80hz and into the cabin speakers.

May not worry about the 8Ē, but I have seen systems with a 12,10 and two 8ís, amped and tuned correctly, that just had such an epically full sound spectrum. Iím going for SQ, and will sound proof the whole car too. Seeing as I am not trying to screw with all the warranties for another 80k miles, I figured FE-building another full stereo system wouldnít be bad.

What have the STi Limited guys done as far as full setups? Anyone running a 3 way component set up in the front doors? Thoughts?

I appreciate any info as I really canít find a lot online, and I donít want to really start popping of panels and risk scratching anything until I know whatís behind it first.

Thank you all!
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Old 07-25-2021, 08:53 PM   #2
THX0849
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Join Date: Oct 2019
Default

If i recall correctly the front door speakers in the HK system are coaxial, 8 & 9. Over on diymobileaudio.com (same user) there are a number of this gen WRX/STI with full blown systems, mine included. Check them out for ideas etc. But i would probably not look into adding more power or upgrading the sub in the rear deck. It can rattle pretty easily and a more powerful sub would be causing even more. If you don't want to go crazy upgrading you could look into an under seat sub (plenty of room there) and use the signal from the current sub to provide the signal for it. Feel free to pm if you've got any questions.
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Old 07-26-2021, 11:49 AM   #3
Trudd84
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Join Date: Jun 2010
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Location: Birmingham, AL
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2004 Impreza WRX
WRB

Default

Quote:
Originally Posted by THX0849 View Post
If i recall correctly the front door speakers in the HK system are coaxial, 8 & 9. Over on diymobileaudio.com (same user) there are a number of this gen WRX/STI with full blown systems, mine included. Check them out for ideas etc. But i would probably not look into adding more power or upgrading the sub in the rear deck. It can rattle pretty easily and a more powerful sub would be causing even more. If you don't want to go crazy upgrading you could look into an under seat sub (plenty of room there) and use the signal from the current sub to provide the signal for it. Feel free to pm if you've got any questions.


By coaxle, you mean a mid bass sub with a tweeter mounted above that?

Iíll figure it out once I take it apartÖlol. And I was kinda wondering if reusing the 8Ē was worth it. Iíll just remove it and let that breathe from the trunk to the cabin. Iíll check out the builds!

What speakers did you end up using for the front doors/dash?
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Old 07-27-2021, 08:11 AM   #4
hooniganjim
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Location: LaPorte, IN
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2021 STI
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Quote:
Originally Posted by Trudd84 View Post
By coaxle, you mean a mid bass sub with a tweeter mounted above that?

Iíll figure it out once I take it apartÖlol. And I was kinda wondering if reusing the 8Ē was worth it. Iíll just remove it and let that breathe from the trunk to the cabin. Iíll check out the builds!

What speakers did you end up using for the front doors/dash?
Just took my door panel off to inspect my right front Harmon speaker on my '21 STI after it developed a horrible vibration. Speaker is blown but there is no built in tweeter in it like the rear door speakers.
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Old 07-27-2021, 06:28 PM   #5
Trudd84
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Join Date: Jun 2010
Chapter/Region: South East
Location: Birmingham, AL
Vehicle:
2004 Impreza WRX
WRB

Default

if the rear door speakers have built in tweeters, those two tweeters would be 8 and 9. you positive there is a separate tweeter in the rear doors?
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Old 07-28-2021, 01:16 PM   #6
THX0849
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Quote:
Originally Posted by Trudd84 View Post
if the rear door speakers have built in tweeters, those two tweeters would be 8 and 9. you positive there is a separate tweeter in the rear doors?
Ok so it was the rest speakers that were coaxial not the front, had it reversed in my mind. Makes sense for them to be in the rest doors instead as tweeters in the front doors would bring the sound down from the dash.You can remove the 8" if you want to get a bit more output from a trunk mounted sub. If you're going to do that do yourself a HUGE favor and sound deaden the rest deck. Both the metal and the panel itself. Also if it rattles, as it did in mine, put some weatherstripping on the edge of the third brake lamp housing where it meets the glass.

I did a full 3 way Audio Frog GS series front setup. But to be honest I'd only recommend that if you going to get a DSP and all the stuff needed with it. If you want a simple upgrade without breaking the bank etc stick with a 2 way setup with the stock locations. What's your budget like, expectations? Could do a 6 channel amp with component 6.5" set up front and sub in the rear. Channels 1-2 front doors 3-4 rear doors and 5-6 bridged to a sub. Feel free to pm me if you prefer.
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