Inherited a Bose am5 Ser2.

Seems fine until I crank it up, then the bass module starts to protest with a resonate rattly noise on deep bass notes, however if I lay it on its side and lean on it/ put a pile of books on it, all seems OK....

Any diagnosis thoughts welcome

TIA

Jim K

In article ,
JimK wrote:
Inherited a Bose am5 Ser2.

Seems fine until I crank it up, then the bass module starts to protest
with a resonate rattly noise on deep bass notes, however if I lay it on
its side and lean on it/ put a pile of books on it, all seems OK....

Any diagnosis thoughts welcome

If turning the speaker on its side tends to remove the nasty noises I'd
say the speaker suspension has sagged - quite common. What happens then is
the voice coil scrapes on a pole piece, making the noise. If you can get
inside it, invert the speaker.

If you can get at the speaker itself, try pushing the cone gently with
your fingers applying pressure all over. You can usually feel it scraping
if this is the problem.

--
*Certain frogs can be frozen solid, then thawed, and survive *

Dave Plowman London SW
To e-mail, change noise into sound.

Turn the driver around inside the box?
I wonder what the state of the suspension is. I have a subwoofer that will
hit the buffers if driven too hard, but its not a Bose.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"JimK" wrote in message
...
Inherited a Bose am5 Ser2.

Seems fine until I crank it up, then the bass module starts to protest
with a resonate rattly noise on deep bass notes, however if I lay it on
its side and lean on it/ put a pile of books on it, all seems OK....

Any diagnosis thoughts welcome

TIA

Jim K

On 01/09/14 09:39, Dave Plowman (News) wrote:
In article ,
JimK wrote:
Inherited a Bose am5 Ser2.

Seems fine until I crank it up, then the bass module starts to protest
with a resonate rattly noise on deep bass notes, however if I lay it on
its side and lean on it/ put a pile of books on it, all seems OK....

Any diagnosis thoughts welcome

If turning the speaker on its side tends to remove the nasty noises I'd
say the speaker suspension has sagged - quite common. What happens then is
the voice coil scrapes on a pole piece, making the noise. If you can get
inside it, invert the speaker.

If you can get at the speaker itself, try pushing the cone gently with
your fingers applying pressure all over. You can usually feel it scraping
if this is the problem.

I am afraid this is often the effective end of life for a bass unit.

plastic and rubber starts to rot ans do the cloth spiders, and no one
really recones stuff these days.


--
Everything you read in newspapers is absolutely true, except for the
rare story of which you happen to have first-hand knowledge. €“ Erwin Knoll

/ If turning the speaker on its side tends to remove the nasty noises I'd say the speaker suspension has sagged - quite common. What happens then is the voice coil scrapes on a pole piece, making the noise. If you can get inside it, invert the speaker.

If you can get at the speaker itself, try pushing the cone gently with your fingers applying pressure all over. You can usually feel it scraping if this is the problem./q

Mmm ta. The difference seems to be when I lean on the (largest) side. I currently have a pile of cook books on there and it's belting away quite happily. Does that fit with the voice coil thingy?

It's as if somethings resonating but can be damped by a pile of cookbooks/me leaning on it...

Jim K

In article ,
The Natural Philosopher wrote:
If turning the speaker on its side tends to remove the nasty noises
I'd say the speaker suspension has sagged - quite common. What happens
then is the voice coil scrapes on a pole piece, making the noise. If
you can get inside it, invert the speaker.

If you can get at the speaker itself, try pushing the cone gently with
your fingers applying pressure all over. You can usually feel it
scraping if this is the problem.

I am afraid this is often the effective end of life for a bass unit.

plastic and rubber starts to rot ans do the cloth spiders, and no one
really recones stuff these days.

It depends. Spendor BC1 bass units sag like this without there being any
apparent damage. Inverting them every couple of years extends their life -
perhaps to infinity. Of course if the unit is rubbing because the voice
coil is distorted through overloading - or as you say through bits of the
unit actually rotting away, the only real fix might be replacement.

--
*What do you call a dinosaur with an extensive vocabulary? A thesaurus.*

Dave Plowman London SW
To e-mail, change noise into sound.

Noticed today that the front plastic 'horned' grill had come loose.....

Took that off to reveal a splodge or 6 of 'no more nails' that had presumably held it on since the last time it fell off...and a few more bits of dried adhesive that had come adrift.

Took the rear off and had a look/play with the cones etc, seemed fine, no grating, no rot, nothing obviously amiss... labels on magnets dated 1995 which would seem to fit history...

So reassembled &glued front on with proper evil sticks like **** & leave to cure overnight. Fingers crossed...

Cheers
Jim K

JimK wrote

If turning the speaker on its side tends to remove the nasty
noises I'd say the speaker suspension has sagged - quite
common. What happens then is the voice coil scrapes on a pole
piece, making the noise. If you can get inside it, invert the speaker.

If you can get at the speaker itself, try pushing the cone
gently with your fingers applying pressure all over. You
can usually feel it scraping if this is the problem.

Mmm ta. The difference seems to be when I lean on the (largest)
side. I currently have a pile of cook books on there and it's belting
away quite happily. Does that fit with the voice coil thingy?

It's as if somethings resonating but can be damped by a pile of
cookbooks/me leaning on it...

Yeah, it sound more like there is something else loose inside and that's
why the books stop it, because it forces the largest side against what is
loose against that side. You wouldn't normally expect pressing on the
largest side would have any real effect on a cone coming to bits.

/Noticed today that the front plastic 'horned' grill had come loose.....

Took that off to reveal a splodge or 6 of 'no more nails' that had presumably held it on since the last time it fell off...and a few more bits of dried adhesive that had come adrift.

Took the rear off and had a look/play with the cones etc, seemed fine, no grating, no rot, nothing obviously amiss... labels on magnets dated 1995 which would seem to fit history...

So reassembled &glued front on with proper evil sticks like **** & leave to cure overnight. Fingers crossed... /q

Sorted :-):-):-):-)

Jim K

replying to JimK, Jbmeth007 wrote:
It's the black plastic baffle inside the sub, in the process of fixing mine
now, headed to the store to pick up some epoxy putty. The problem is the
plastic baffle is slightly shrunk. Therefore on higher notes it sounds like
the front baffle is slapping. Sounds like a blown woofer but obviously it
isn't. I'm going to place some putty in between the wood and plastic baffling
to help eliminate some if not all of the annoying slapping noises. Bose did
not put a sealant around that baffle which of course inevitably led to the
nuisance.

--
posted from
http://www.homeownershub.com/uk-diy/...le-992181-.htm

On 28/06/16 22:44, Jbmeth007 wrote:
replying to JimK, Jbmeth007 wrote:
It's the black plastic baffle inside the sub, in the process of fixing mine
now, headed to the store to pick up some epoxy putty. The problem is the
plastic baffle is slightly shrunk. Therefore on higher notes it sounds
like
the front baffle is slapping. Sounds like a blown woofer but obviously it
isn't. I'm going to place some putty in between the wood and plastic
baffling
to help eliminate some if not all of the annoying slapping noises. Bose
did
not put a sealant around that baffle which of course inevitably led to the
nuisance.

LL. I bought a car with a subwoofer in the back. One day coming back
from supermarket U thought 'bugger! sounds like the bass units gone' It
was a plastic bag flapping up down down in the boot


--
Ideas are more powerful than guns. We would not let our enemies have
guns, why should we let them have ideas?

Josef Stalin