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AUDIO SYSTEM IMPROVEMENTS - SUBARU OUTBACK 2020 booming bass from the door speakers issue

41K views 97 replies 12 participants last post by  markinaustin  
#1 · (Edited)
Hello all,

I am new to this forum, and first time Subaru owner. I work and live in Toronto area, in Canada.

I purchased in June Outback 2020 (basic trim) and so far I love everything about this car exept one thing which is importnat to me - the audio system. It is horrible. May be as horrible as Dodge Caravan , if not even worst.

I am electrical engineer, and long time audiophile, but when it comes to car audio, I am not experienced.

I will be happy if we can keep this post within purely technical discussion as much as possible.
There are plenty of you tube videos and posts in internet such as “I updated to such and such brand of audio components, I installed amp or speakers” That is fine , but we need to understand first what exactly are the problems of the cheap audio system Subaru installed, before we consider this or that brand and compinent for upgrade.

So far, with my previous cars - Honda Civic, Honda Accord and Hyundai Sonata (also entry, basic models) I had if not great, but at least some decent sound.

With my new Outback , however - the sound system is a big disappointment.
I love everything else in this car, but I hate the audio system.
It is so bad, that the first thing I have to do when it turns on is to turn it off.

Someone may say - if you care so much about audio, why you didn't purchased upgraded Outback with HK audio system.
Because I am not ready to spend extra 10K ( Canadian) just for one extra I need - the audio system.

Also, the upgraded audio offered by the dealership (with Rockford Fosgate kit) didt sound to me convincing at all.
From what I see in the upgrade manual, they just install extra amp and front speakers.This will not resolve the issues of the back speakers, and the issue of the relatively high harmonic distortions of the whole audio system.
Funny enough - l when I asked if I can hear a car with installed Rockford Fosgate kit -they said, I have to purchase the kit and the installation first.
The dealerships don't have vehicles with installed Rockford Fosgate upgrade kits. How the hell I will purchase something, if I can not evaluate the quality of the upgrade, does it worth the money spent?
This is the reality of the today’s world - people are buying brands ( such as Harman Kardon, Bose or Rockford Fosgate), there is no too much option to actually evaluate what you are buying.
I know that HK (for extra 10K car trim upgrade) will deliver good sound, but no- thanks. (When you do a test drive, they give you the top model, and yes - HK sounds really nice).

I am understanding that in a such basic model, and with so may good extra automotive futures included, the designers and management were trying to do saving wherever else than can.
But with saving with audio components, unfortunately, they droped the ball really low. (Which is a shame, because the displays ( 2 separate for my basic model) are beautiful as resolution. colour and brightness)



So far, I did one minor audio improvement - I installed 2 tweeters (Kicker brand) in the empty speaker spaces near the windshield. I choose these non-Subaru, non-OEM tweeters, becuase there is no information ( or at least side view picture) on the whole internet - to show me if the Subaru parts are cheep piezzo speakers ( piezzos always have with higher distortions, than the classical electrodynamic type os speaker - the one with magnet and coil). I assumed they are piezzo, they a light and thin.



But let us focus first on one aspect only of the bad audio system - the strongly resonating bass in the door speakers at some particular frequency.

(We are talking here not for buzzing sound of doors in result of high bass volume, or bacuase of loose assembly)

My point is, that unless you listening techno music, for any other music style, booming of the bass is extremely unpleased sensation .

If the bass guitar plays for example E A B F C- it sounds lound only on one note -let say A.
Horrible :-(

Technically speaking, there are a few reasons why a enclosed speaker can resonate and boom on certain low frequency:

1. Speakers have own strong resonance on certain frequency (this is what in Hi-Fi world you are trying to eliminate by design)

2. Acoustic resonance in result of the standing waves and the volume of the enclosed space behind the speaker.

3. High impedance of the amp in the infotainment system (or cables) cause increased resonance of the speakers.


My initial thoughts:

I will measure and find out what are the actual resonance frequencies of the front 6x9in and back 6,5in speakers


Possible resolution of 1:
If the unpleasant resonance is a result of a poor quality speakers, I may consider replacement.
Starting with the backdoor speakers. I am considering for possible replacement these

Possible resolution of 2:
If contributing factor of resonance is the enclosed acoustic chamber behind the speakers - I can consider adding any of the many audio absorbing materials available . I think I would and also some internal micro-sound barriers and enforcers - to break a standing wave within this space.

Possible resolution of 3
If the factory installed infotainment system has already a weak amplifier with high impedance Z (possibly class D amplifier) -than there not too much can be done with repplacing speaker.
Then the only solution would be to find pins on connectors, where pure non-amplified audio signal might be available - and to add of proper (decent quality) audio amplifier .



I said enough about the topic :)
Now, I would like to hear what other fellow Outbackers have to say about this.

Any opinion matters, but I will enjoy even more the pure technical, (non commercial) suggestions.

Thanks in advance,
Lubo
 
#3 ·
I’ve noticed both of you issues. The bass is just off, inconsistent, and booming when it shouldn’t be, even changing the EQ to cut it.

I have a premium with the stock tweeters and they are bad. I actually unplugged them (since I installed 3 way front speakers anyway) now until I get the Kicker replacements. Unplugging them actually resulted in a much more pleasant sound.

I may end up replacing the fronts again and the tweeters with components once I get the amp setup.

I’m going with the Kicker Key 200.4

It has a built in audio control and has a microphone. It’s supposed to use AI to make the sound better. Reviews seem positive so far.
 
#5 · (Edited)
Than you for the info

Your experience with the front tweeters ( windshield speakers) is leading me to believe that they are really piezzo type, as I suspected. If it is not too much trouble to walk to your garage and open the box where you stored them, do you mind some pictures ? I will realy appreciate

Also I am curious to see picture of the front door speakers you replaced.


Part number of the stock speakers - if visible will be very useful. I can investigate their part numbers ( who produces them, Subaru does not produce speakers) This will probably help me with choosing replacements with exactly the seame mechanical dimensions out hole mounting

Replacing of the amp is probably a good idea.
Do you replace it yourself, or a specialized shop? For adding amp - it isportant to know where, on which connector and pins - a pure undistorted sound signal can be obtained
 
#4 ·
@ Shark

May be...
But remember - speakers are not everything in audio.

If any of you has some practical experience with replacing the speakers already I am ready to listen.
Did anyone with Outback 2019 or 2020 basic model replaced already the door speakers?
Any pictures what stock speakers they found installed inside will be appreciated.
As well with what speakers they replaced them - suggestions for brands, model numbers, listening impressions .


Pleople, adding a big amp and subwoofer is not answer of all questions. Unless you are listening only loud AC/DC or DJs such as Tiesto, Armin, PvD etc.
 
#96 ·
old post...I know, but for my 2018 Outback 2.5i base model (ie: no dash speakers), I added Infinity Reference 3032CFX with Red Wolf adapters in the dash (no bass blockers or capacitors added), and Infinity Reference 9632IX (2 way 6x9's) in the front doors, along with Kilmat in the front/rear doors and the sound was massively improved. No amps added, sound turned up to level 25 was perfect. No bass rattle in doors, but I think I would have tried to seal the doors a bit better, and perhaps some speaker gasket foam should have been added. Also, found moisture inside the door at some point :(
eventually traded the car in for a 2017 Outback 3.6r Limited with HK audio package. Audio system is pretty poor in this car. My 2 sets of aftermarket speakers noted above were better, in my opinion,. Smooth power of 6 cylinder was welcomed though.
 
#7 ·
To the OP: the stock 11.6" HU isn't a power plant by any means, but it has enough to make new speakers sound ok. I got the Tweeter upgrade on Amazon, plus 2 pairs of Pioneer A series speakers (front and rear doors). All in about $250 US. You can spend a few times more than that and remove several panels to really beef it up but IMO it drastically improved the sound quality. It's acceptable now. Warm, rich and enveloping. Best of luck!
 
#8 ·
I am convinced that the booming bass isn't just the result of the speaker itself, but heavy equalization in the head unit that even at "flat" is boosting certain frequencies. I too was frustrated with the bass. It's too heavy around 60hz but too weak at 120hz (did not measure but it sounds that way to me). Bloated, lacks midbass punch, boomy, so music with no real low frequency music can sound tinny yet anything with bass sounds exaggerated and boomy.

People who recommend the KEY 200.4 I think are on the right track. No matter what speakers you get, they need a clean signal and I don't think we can get that from the head unit. We need some kind of DSP or EQ to undo the heavy handed equalization that's baked into the system.

Just going off my own experience and digesting the response from others who have done system upgrades this is how I would rank them:

Stock system: 3 out of 10

Just change all the speakers to better aftermarket ones: 5 out of 10 - good enough for casual listening option

Rockford Fosgate option plus Kicker tweeters: 7 out of 10 - decent for non-critical music enjoyment

Kicker KEY 200.4 plus aftermarket speakers: 9 out of 10 - audiophile option
 
#13 ·
I am convinced that the booming bass isn't just the result of the speaker itself, but heavy equalization in the head unit that even at "flat" is boosting certain frequencies. I too was frustrated with the bass. It's too heavy around 60hz but too weak at 120hz (did not measure but it sounds that way to me). Bloated, lacks midbass punch, boomy, so music with no real low frequency music can sound tinny yet anything with bass sounds exaggerated and boomy.

Not a bad guess at all (y)

Just desided to do a quick measurement - how bad are the stock speakers - frequency response only - the front door speakers

I never seen such a bad “ tsunami” in any real audio system. Not even close ;)

495275
 
#10 ·
These threads might make good reading




 
#11 ·
Most factory speakers are extremely cheap, because 95% of folks don't care and they know that.

I removed the $2 factory speakers from the front doors and replaced with infinity reference 6x9. Huge difference in quality.

Subs are not just for loud rock music. Mid-range speakers are not capable of producing accurate low frequencies.

Sent from my SM-G960U using Tapatalk
 
#15 ·
I installed aftermarket speakers and while it helped, that weird bass EQ and lower midrange suck out are still apparent.


One member got satisfactory results by using a multi-band EQ in his music app.
 
#17 ·
You might find this interesting - frequency response of the Harman Kardon system:

 
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#18 ·
ОК, I am starting to review the available speakers on the market. Trying to go on the manufacturers sites,, find the data sheets , see the frequency response of each.

The other issue will be to find adapter for mounting, because from what I see - the mounting holes are not matching. Did anyone came across some information of what mounting adapters are available.
Does anyone have the exact dimensions of the distance between mounting holes on the doors ?

Also for the front door speakers - using the all available space with 6x9, or replacing of the stock 6 3/4 with a good one?

As you can see - some additional online research ahead.
 
#24 ·
OK, everything arrived, today I did some installations and it is time for reporting observations and results

I will post many smaller posts instead of one larger, many colleagues here find easier to read short posts.


Before I even started, it was wise to remove the fuse for the audio in order to avoid any chance of damage during instillation of the speakers.

Guess what - I didn’t, because I couldn't :)

I removed the 15 A fuse designated for AUDIO/NAVIl but my radio system stayed on.

The only possible explanation is that the radio in my basic model is powered by another fuse. And this particular fuse is probably dedicated for powering of expanded audio system or additional future amps - on upper models.



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#25 ·
I didnt go so far to disconnect from the battery the whole power. I furred out that with connectors used my skills, it is safe to replace the speakers without a risk of shortening the the output of amplifier of the existing systems system.




Before installation I also decided to add some sound deadening mats

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and soft synthetic sound damping material from a pillow

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#26 ·
The stock speaker of the front right door


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was replaced with the Kicker 6x9 - see the model in a previous post


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With the wright braked and cable harness installation was easy and everything fit nicely and tight.


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Then I put the cover back. Everything now is nice and tight, no issues with assembling back to the original stage.

I did similar instalation of the 6 3/4 Kicker speaker on the back right door as well with the same sound deadening and absorbing materials too
 
#27 ·
Now with updated speakers on the right doors and the original stock speakers on the left doors I did some listening evaluation of the differnce.

I also used a app for my IPad to do some comparison of the frequency responce.

I used this app - House Curve. It is for evaluation of home audio system, but opit is good for evaluating car systems as well. The developer claims that it has built-in compensation of the Ipad or Iphone infections of the microphone. This is not a professional measurement equipment, but for the purpose I am using it I am assuming it is accurate enoght

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#28 ·
Listening comparison right to left speakers :

Obviously with the upgraded speakers the sound is better in terms of non linear distortions
It is a 3-way speaker with solid magnet and the results for clearer mids and trebles are satisdatory.

Also with both speakers on same volume - the Kickers sound a bit louder - they higher sensitivity 92dB/W/m and this is understandable because the bigger magnet.

However,
The booming bass is still there :(


There is a gentleman who shared in a a few posts before that his replacement with another ungraded brand didn't resolve his booming issue as well.
 
#31 ·
Ad you can see - not too much difference in terms of frequency response.
Thanks god that the sound i clearer, otherwise someone ( my wife ;)) may raise the question - doses it really worth spending money of speakers updates.

Well I am safe, because in many previous home audio projects , I never gave up after such blowbacks and I fought until good results. (After some corrections , now my home audio and musical instruments amos are now recognised by others and my wife)


So the question is - what is next?
 
#32 ·
The unpleasant base resonance around 60Hz ca be caused by 2 reasons

1. Low output impedance of the built-in stock amplifier.
2. Mechanical resonance of the doors ( they are quite flexible and soft and the enclosed volume is perfect for creation of standing waves

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