A question for the experts he can a particular piece of music make a
speaker misbehave? Make a sub sound like there's something loose inside?
There is a track (track 2 of Cafe Del Mar Quattro) which makes my sub
rattle. I've never noticed anything but good sound with any other track. It
is an MP3, but converted at 256 kbps from the CD. My main speakers are
Tannoy Revolution 2s, and the sub is a REL Q150.

I've had a look at the track graphically in Cool Edit 2000, and I can't see
any 'clipping' (if I understand that phenomenon correctly, that is, the
sound wave doesn't extend to the upper and lower limit lines during the
relevant passage).

Is my REL on it's way out? It's only 3 years old.

Dave W.

On Tue, 8 Feb 2005 18:00:09 -0000, "Dave W."
wrote:

A question for the experts he can a particular piece of music make a
speaker misbehave? Make a sub sound like there's something loose inside?
There is a track (track 2 of Cafe Del Mar Quattro) which makes my sub
rattle. I've never noticed anything but good sound with any other track. It
is an MP3, but converted at 256 kbps from the CD. My main speakers are
Tannoy Revolution 2s, and the sub is a REL Q150.

I've had a look at the track graphically in Cool Edit 2000, and I can't see
any 'clipping' (if I understand that phenomenon correctly, that is, the
sound wave doesn't extend to the upper and lower limit lines during the
relevant passage).

Is my REL on it's way out? It's only 3 years old.

Dave W.


It sounds like your sub HAS got something loose inside. If this
problem was from the signal, the rattling noise wouldn't come from the
sub, but the main speakers. Probably not the end of the world though -
open it up and have a look - a loose screw is favourite.

d
Pearce Consulting
http://www.pearce.uk.com

"Don Pearce" wrote in message
...
On Tue, 8 Feb 2005 18:00:09 -0000, "Dave W."
wrote:

A question for the experts he can a particular piece of music make a
snipped
Is my REL on it's way out? It's only 3 years old.

Dave W.


It sounds like your sub HAS got something loose inside. If this
problem was from the signal, the rattling noise wouldn't come from the
sub, but the main speakers. Probably not the end of the world though -
open it up and have a look - a loose screw is favourite.

d
Pearce Consulting
http://www.pearce.uk.com

Yes, thanks Don. Confirmed with another track which the sub has handled
without problems in the past. As you say, no harm in looking. I know my
limitations.

Dave W.

It sounds like your sub HAS got something loose inside. If this
problem was from the signal, the rattling noise wouldn't come from the
sub, but the main speakers. Probably not the end of the world though -
open it up and have a look - a loose screw is favourite.

d
Pearce Consulting
http://www.pearce.uk.com

Yes, thanks Don. Confirmed with another track which the sub has handled
without problems in the past. As you say, no harm in looking. I know my
limitations.

Dave W.

Yep, had a look. Everthing tidy and well secured in there. Of course it's
just out of warranty. I feel a bit put out because it's never been driven at
party levels, me being an old git who gives a damn about his neighbours. Not
sure it's broke though. For the moment, I've just adjusted the roll-off down
a tad to 50 Hz. Seems to behaving itself so far. We'll see.

Dave W.

I would say the mp3 has some low frequency at high volume your speaker can't
handle. A roll off @ 50Hz is not a sub to my thinking, my old Marantz
bookshelf mini-monitors rolled off at 43Hz, my current IPL TL4's are flat
down 30Hz.
Have a search on Google, I'm sure you could find a swept or better still
spot frequency mp3 so you can judge whats happening low down.

--
Pete Cross

"Dave W." wrote in message
...
It sounds like your sub HAS got something loose inside. If this
problem was from the signal, the rattling noise wouldn't come from the
sub, but the main speakers. Probably not the end of the world though -
open it up and have a look - a loose screw is favourite.

d
Pearce Consulting
http://www.pearce.uk.com

Yes, thanks Don. Confirmed with another track which the sub has handled
without problems in the past. As you say, no harm in looking. I know my
limitations.

Dave W.

Yep, had a look. Everthing tidy and well secured in there. Of course it's
just out of warranty. I feel a bit put out because it's never been driven
at
party levels, me being an old git who gives a damn about his neighbours.
Not
sure it's broke though. For the moment, I've just adjusted the roll-off
down
a tad to 50 Hz. Seems to behaving itself so far. We'll see.

Dave W.

"Pete Cross" 1@2 wrote in message ...
I would say the mp3 has some low frequency at high volume your speaker
can't
handle. A roll off @ 50Hz is not a sub to my thinking, my old Marantz
bookshelf mini-monitors rolled off at 43Hz, my current IPL TL4's are flat
down 30Hz.
Have a search on Google, I'm sure you could find a swept or better still
spot frequency mp3 so you can judge whats happening low down.

--
Pete Cross

That's me trying to be clever. I obviously misundertand the term 'roll-off'.
The control I set to 50 Hz will allow the sub to handle all frequencies
below that (I believe), and these RELs really do go low.

Dave W.