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Old 17th July 2003, 10:07 AM   #1
Ropie is offline Ropie  United Kingdom
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Default Boomy TLs

I just built a pair of M3 Transmission Lines from IPL. They are great speakers but I noticed that with certain music and on certain notes, the bass rumbles and booms unpleasantly. I have a large table in the room which I thought may be affecting the sound somehow but since moving the speakers away from it the problem remains.
The cable runs to my amp are short and there is some stuffing in the line but not a lot. My amp is an old Rotel, not a great model, could the problem be a worn out amp?? I'm currently building a gainclone to replace it. Also I thought that it could be some 'panel ringing' inside the line, though I made sure that these were well braced when I built it.

I'd appreciate some help with this problem as I'm not qualified enough to dive in and start messing with the crossover without checking first.
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Old 18th July 2003, 06:43 PM   #2
DaveM is offline DaveM  United States
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Try adding more stuffing to the line. This should dampen out some of the bass ringing at the cost of bow end extension. You need to play with the stuffing to find where it works best with your setup and room.

Dave
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Old 19th July 2003, 12:15 AM   #3
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Default No Bleating In My System

My TL's are damped with Merino long fibre wool.
I get very nice very low end rumble but no boom whatsoever.
Wool has always been the preferred damping material.

Eric.
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Old 19th July 2003, 03:55 AM   #4
asauer is offline asauer  United States
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I thought stuffing in TL's was just used to reduce the upper resonance frequencies (i.e. if the TL is tuned to 30Hz, the resonances at 120Hz, etc etc)?
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Old 19th July 2003, 04:01 AM   #5
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Quote:
Originally posted by asauer
I thought stuffing in TL's was just used to reduce the upper resonance frequencies (i.e. if the TL is tuned to 30Hz, the resonances at 120Hz, etc etc)?
yes, but if you don't have enuff stuffing you aren't killing those.

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Old 19th July 2003, 10:44 AM   #6
Ropie is offline Ropie  United Kingdom
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Default Thanks

Thanks for all the advice. Will a certain type of stuffing block out just the boomyness in the small range of bass frequency that seems to be affected then? Should the stuffing go in the line, behind the woofer or both?
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