Has anyone used mass loaded vinyl for cabinet dampening material? Seems that is is used in place of lead in come applications and could be combined with fiberfill or foam to form a multi density mat for speaker cabinets...
Thoughts....
Mass Loaded Vinyl~MLV~Soundproofing Material - Trademark Soundproofing
Thoughts....
Mass Loaded Vinyl~MLV~Soundproofing Material - Trademark Soundproofing
if you built the cabinet right i dont see a need for it. its mainly use to load the flat sides with weight so it lowers the resonating Fq of the item its placed on and also as a sound barrier.
it would be better if placed onto the walls of the room to lessen the sound leakage to adjacent rooms.
it would be better if placed onto the walls of the room to lessen the sound leakage to adjacent rooms.
Vinyl floor tiles work pretty well glued inside a cabinet. They have nearly as much damping resistance at a fraction of the price of custom materials.
What is frequently missed here is that for a cabinet, the goal is to RAISE the resonant frequencies where they will not be a problem. Adding mass may lower the Q, a good thing, but also lowers the frequency. This is why we add braces and use very rigid material.
Thats exactly right, anyone who has watched the movie Jurassic Park knows that this is true.
If your speaker is doing this then its talking to you through the cabinet and not the air.
Last edited:
Then, there's the other approach:
http://www.diyaudio.com/forums/mult...ad-i-found-lossy-cabinet-designs-harbeth.html
http://www.diyaudio.com/forums/mult...ad-i-found-lossy-cabinet-designs-harbeth.html
A vinyl tile is almost viscous (bend one and see) and resistive to vibration. Bracing on the other hand takes up as much or more internal volume in a small box. In a large one, bracing may increase the Q and raise the fr of the cabinet walls right into the midbass range where it is most audible. Without modeling software or a bit of trial and error, it’s all guesswork.
Bracing pros:
1. Reduces cabinet wall vibration, lessening the through transmission of LF sound.
2. Fr of box walls raised above the crossover of the driver occupying the box.
Bracing cons:
1. Added mass of bracing may largely offset the reduction in cabinet vibration, especially in a large cabinet.
2. Fr of box vibration may not be raised above the crossover and the higher Q of the fr may produce more noticeable “box talk”.
Wall Damping pros:
1. Resistance of wall panel is increased, lowering its Q and dissipating vibration through heat.
2. Simplified design and construction, with increased net box volume vs. exterior dimensions.
Wall Damping cons:
1. Box wall Fr and Q loss number lower than a well braced cabinet. Speaker’s F3 is increased.
2. Damping may cause wall Fr to fall into the woofer’s pass band and increase “box talk”.
Bracing pros:
1. Reduces cabinet wall vibration, lessening the through transmission of LF sound.
2. Fr of box walls raised above the crossover of the driver occupying the box.
Bracing cons:
1. Added mass of bracing may largely offset the reduction in cabinet vibration, especially in a large cabinet.
2. Fr of box vibration may not be raised above the crossover and the higher Q of the fr may produce more noticeable “box talk”.
Wall Damping pros:
1. Resistance of wall panel is increased, lowering its Q and dissipating vibration through heat.
2. Simplified design and construction, with increased net box volume vs. exterior dimensions.
Wall Damping cons:
1. Box wall Fr and Q loss number lower than a well braced cabinet. Speaker’s F3 is increased.
2. Damping may cause wall Fr to fall into the woofer’s pass band and increase “box talk”.
eh, box talk ?!
Sound is produced by the cone ( moving )
the back wave enters in a chaotic box and the easiest way for it to exit
is trough the cone itself ! The box and the cone are mostly transparent to the lower frequencies .
Sound is produced by the cone ( moving )
the back wave enters in a chaotic box and the easiest way for it to exit
is trough the cone itself ! The box and the cone are mostly transparent to the lower frequencies .
Hi,
If going the damped wall route you don't start off with 18mm stock.
Walls are usually 9mm to 12mm and can be a a sandwich (of say
4mm and 6mm) with a constrained glued damping layer that you
add the restraining damping sheet to say :
6mm MDF / glue / 4mm MDF / 6mm damping layer.
Takes up no more volume that 18mm stock and has no bracing (usually).
The approach really does work for clean midrange from a 2 way.
rgds, sreten.
If going the damped wall route you don't start off with 18mm stock.
Walls are usually 9mm to 12mm and can be a a sandwich (of say
4mm and 6mm) with a constrained glued damping layer that you
add the restraining damping sheet to say :
6mm MDF / glue / 4mm MDF / 6mm damping layer.
Takes up no more volume that 18mm stock and has no bracing (usually).
The approach really does work for clean midrange from a 2 way.
rgds, sreten.
- Status
- Not open for further replies.