Acer Predator 15 G9-593 Subwoofer rattling

AVJim

I have the Dolby on.  I haven't spent much time listening critically to all the dolby presets but currently I have mine set on Game preset.  When I slide the slider all the way up on the realtek volume slider I get the System Sound Chime you are referring to.  It's hard for me tto compare with what you are hearing but on my G9 what I hear is a slight bit of what I would call "Cone Breakup" for lack of a better more scientific term.  Common in small low-excursion transducers like are found in this type of laptop or other small electronics.  Now whether what you are hearing is the same I'm not sure...but in my opinion at top volume a little bit of breakup at a narrow band of frequency is totally normal for small speakers.  If what you are hearing is more of a loud mechanical rattling then it might be hard to chase down but when we put large subwoofers in clients custom cabinets we often find ourselves chasing down resonances that are being excited by the speakers...these can be really tough to get rid of but the answer is often what we call dampening...and that ussually means some foam rubber or neoprene type pads that dampen out the resonant frequencies...so maybe there is a tweak here to be had under the keyboard....one thing you can do though to check a little is just turn down the volume a little...if the noise goes away then fine you are overdriving the speaker or just exciting resonances to the laptop enclosure...if the sound doesn't go away but just gets less in intenesity at moderate volumes...you have a mechanical issue ...maybe...probably...something loose(something as simple as a wire dressed a certain way thats being excited against a surface) or maybe a blown speaker. 

 

I hope this helps!

simi_id

As I've said ... there is a design issue with this laptop and specifically with subwoofer placement or keyboard manufacturing.
In before G751 had the subwoofer placed with screws while on G752 the screws were replaced with some rubber pads because tighten with screws would had produced more vibrations and changing the motherboard design, case layout, etc would had been costly.
If the subwoofer is removed from the placement inside laptop and put outside or kept in hand it won't make that vibrations noise when playing that default windows sound. When placed back in laptop the vibration will start again. While the keyboard is one of the best keyboards in laptops, the mechanical parts more concise the metalic springs on some keys or the backplate how it is built make those vibration noise which sounds like a bad speaker.
In my first post in this thread I linked some youtube videos for speaker tests where those vibrations are are around 300 or 500 kHz.
This issue cam be fixed easy dismantling the entire laptop but I am not am acer employee and I can't afford to dismantle the entire laptop to offer a solution as it is now. It's fixable as evga did with thermal pads when they had issuea with their gtx1080 cards but I have to dismantle the laptop.
Thank you

AVJim

Hey sorry I scimmed through this post a little too fast and missed that if you take the speaker out it stopped the noise.  Well from what I've seen gettting full access to the sub for dampening (at the sub itself) might be pretty easy.  Just have to take the back cover off to get at it.  See if you can dampen some of the resonance.  Should be able tto hit the subwoofer surfaces with some foam tape that might fix it up.  It will probably look like the picture here (G9-793 teardown shown)  and comes apart pretty much the same way.  Check this video if you like:

 

https://www.youtube.com/watch?v=DVEpuZNWLxw&list=PLrTyFxO3GU2H4hXSwhXSH_XhIhn0Xx3KO&index=11

 

simi_id

I meant to fix the vibration you have to remove also the cooler, motherboard and other parts to reach the keyboard. Opening the back plate to get to subwoofer is not enough.

Thanks

Elvetius

aloha/hi

not sure if this is going to be the solution for you, but from my point of view it looks like you have something stuck in the subwoofer casing or the subwoofer itself, in short, the sound is produced by membrane which is attached to copper coil which is using permanent magnet to move itself....
the magnetic core is picking up any magnetic metal things that come nearby, be it needle or even small metal scrap,

solution in this case would be to dissasemble the back cover, and cautiosly clean the paper-ish membranes - this is a problem with any tech related to sound, speakers, headphones.. all of those can get "dirty".

if you are intending to do so, according to several dissasembly videos, doing so should not void the warranty, not gonna guarrantee that,

also, dont take this warning lightly, unless you are someone with propper education/experiences/skills, etc, do not try to do this, you will most likely damage the speakers, or the laptop itself, its not worth it, leave it to the proffesionals.

cheerz



also, the the subwoofer enclosure is indeed alluminium, do not try to pry it out, you might damage it that way

would be nice to know if i was helpfull so let me know if you can, thanx

asad814

if i unplug the wire of sub woofer from MB then would the rattling stop or not???

LuisMx

Hi I just bought a Predator G9-792 two days ago, the former first owner told that the first couple of months didnt noticed something wrong with the speakers because he mainly used headphones, but one day he turn the sound all the way almost to 100% but the sound was horrible, only tolerable if the volume of slider is turned at 15%  max.  

I dont like to use headphones all day, but while I was formatting and loading my programs I was looking for a remedy to this.

I went to so many forums, and while on most of them, users recomended to change the drivers and use a patched ones to modify the equalized sound. 

I downloaded a couple but still not convinved. then I decided and opened the laptop. removed the screws and found an staple  on the subwoofer.  Also I saw some yellow stif tape around it. 

And even tough the subwoofer has some soft rubber legs -to work like vibration absorber-, they seemed a little loose, So I used polystyrene to wrap it around and fix it with aluminum tape. 

On the left front speaker did the same.  

And finaly, put all back toghether and turn it on...

And bingo!! Now I have an excellent sound machine.  

Without messing with the system files.

Im greatly satisfied with my predator right now.  

Time spended: 20 minutes.