torn surround

Archived from groups: rec.audio.tech (More info?)

I noticed some distortion with my speaker's sound and upon checking
found out that the surround foam of one unit has ripped. So I removed
all the foam. Then I had one session driving it pretty loud (before
that I was listening at low levels). After a couple of hours, the bass
became noticeably gone. Checking the unit again, I found that the other
unit's surround foam has also ripped.

I'm wondering if there may be some damage to the voice coil or is the
lack of bass due to the missing surround alone.

- Benn

Archived from groups: rec.audio.tech (More info?)

How can I determine if the drastic lack of bass is due to the missing
surround or some other problems with the speaker?
The woofer seems to be working except its frequency response has
changed drastically at the lower end.

Archived from groups: rec.audio.tech (More info?)

"JohnR66" <nospam@att.net> wrote in message
news:9vqUe.26677$qY1.4007@bgtnsc04-news.ops.worldnet.att.net...
> <benn4321@yahoo.com> wrote in message
> news:1126313252.054111.234290@g47g2000cwa.googlegroups.com...
>> How can I determine if the drastic lack of bass is due to the missing
>> surround or some other problems with the speaker?
>> The woofer seems to be working except its frequency response has
>> changed drastically at the lower end.
>>
> Without the surround foam suspension, the speaker can no longer compress
> the air. It just moves around the edge to the back and vice versa
> canceling out the low freq. The speaker needs to be sealed with the foam
> and in the box to work properly.
>
> It sounds as if your speakers are several years old. The polyurethane foam
> degrades and tears and crumbles after several years.
>
> John
>

What he said.

mz

Archived from groups: rec.audio.tech (More info?)

Laurence Payne Wrote:
> On 9 Sep 2005 00:16:57 -0700, benn4321@yahoo.com wrote:
> [color=blue][i]
> I noticed some distortion with my speaker's sound and upon checking
> found out that the surround foam of one unit has ripped. So I removed
> all the foam.
>
> Are you for real? :-)
>
> Your speaker has partially disintegrated. The surround is not an
> optional component! Replace it, or the whole unit. As you have
> been running the cone unsupported, maybe it had better be the whole
> unit now.
Got to admit, Ben's a trip. If you don't know what you're doing, get
informed before doing it. You're on the right forum now, with lots of
good information availible. You probably damaged the woofers voice
coils, running them without surrounds. I've refoamed many speakers
myself with kits from Simply Speakers and Parts Express. Fearing voice
coil damage, you need to have your woofers checked out first.

--
Carver1200