Subwoofer Churping?
Jeff Davis
Posts: 3
I am working on my parents audio system (Christmas gift from me..) They have a Denon reciever with Polk RTi6 speakers and a Polk PSW303 subwoofer. All was working fine until they recieved a new A/V cabinet. I reinstalled everything just as it was but moved the subwoofer to the other side of the room (I gently picked it straight up, carried to other side of room, gently placed it down, plugged it in) Turned whole system on. Now I am getting a chirping noise coming from the Sub everytime bass hits. The louder the volume the louder the chirp / flutter. I checked the volume levels and the crossover level ( grasping at straws...) What is causing this? Any thoughts, ideas, or solutions would be greatly appreciated...
I am contected from sub out on the reciever to LFE in on the sub.
Jeff
I am contected from sub out on the reciever to LFE in on the sub.
Jeff
Post edited by Jeff Davis on
Comments
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how loud do you have the sub?
if you have the sub connected with the LFE, the crossover on the sub isn't doing anything. the crossover on the receiver is what you'd use. -
Sounds like it is bottoming...
How did you have it placed before?
Was it firing away from the seating area?
Is it firing torwards the seating area now?
It could be that it always has been bottoming out, but the placement/direction was keeping you from hearing it...
How large is the room?- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit. -
Thanks you for the quick responses... as for the orientation it is facing the listening area with the port firing toward a wall ( 12" from the wall) It is actuall further away from the wall than were it was first positioned. The volume level is at about 50% (12 o'clock) It did not make this chirping noise prior, it is pretty obvious once the volume is turned up. The Sub out crossover on the receiver is set at 60hrz. What exactly is bottoming?
Jeff -
It's possible that your sub is reaching its maximum excursion... it can't move out or in any farther - bottoming out. You should be careful because if it keep doing this you could fry it. (if it is actually bottoming out)
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Is it setup any way differently?
Is anything around it making noises?- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit. -
bottoming is what happens when you push your sub to its limit. i think its the back of the voice coil hitting the magnet? not positive though...anyway, it makes kind of a clacking sound, like things are hitting eachother. call polk customer service.
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It could always be a little gremlin trying to escape the cabnet?
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I wish it was a gremlin that wanted out...
I was wondering, because it is a longer run to the new location, could the impedence in the cable be causing this, could it be a signal level issue? I just want to isolate wether it is a mechanical issue with the sub, a cable issue, or maybe a signal level issue? Has anyone else experienced something like this? Like I said it is a distinct chirping noise when the base hits, it is audible even when the volume on the sub is turned down to about 25%. I does seen to be coming from the rear port. This unit has never been driven hard and is only about 2 month old. All seemed well until it was moved ( gently moved..I might add) I'm trying to save face with my parents in my ongoing argument that modern technology is a good thing...this isn't helping..
Jeff -
Is there *ANYTHING* around it?
It sounds like there may be a mechanic issue, or maybe something is in the port making a noise from the air flow....
Not 100% sure what is wrong, no one is there to really hear it for themselves, etc...
Give Ken a call...- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit. -
I don't know a lot about the internal structures and contents of speakers but is it possible that some of that insulaty dacron stuff shifted in the move and is now covering the port or interfering with the air flow? When you say fluttering ... that sounds like distortion to me though... just a few cents to add the the pile.
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Not likely...
Polk uses polyfill, which just sits in the cabinet, even if it was infront of the port, you wouldnt notice it...
Unless Polk shifted to using Foam pads, Dacron is alot like polyfill, again - wouldnt matter...
It sounds like he may have an air leak, possibly... Around the port perhaps?
My first instinct is to just say it is blown...
Push around the dust cap with all 5 fingers (4 if your a carpenter
) - and see if you hear a scratching sound, if its there - yall know it...
If you dont, the driver isnt blown...
Or maybe parts of the driver have come undone? Take out the screws, take a look - take pictures, inside the cabinet, everything man...
Pictures will help us help you!
It may very well be an amp problem, but I doubt it...
It sounds structural- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
