[Soonerbass]

I have been watching for some time and I am a believer in damping unwanted ring and resonance. I know you have gone over this before, but I don’t believe that a single source is all you need. In other words what about adding other materials inside the cabinets in various locations juxtaposed to the no rez applications. This creates more dynamism to the sound in my view and relieves the ‘dead’ sound of the no-rez material alone. Any thoughts?

[Tyson]

I also find it's quite possible to overdo it with the NoRez.  Over time Ive come to a method that works really well.  I put NoRez on the top panel and the back panel and I use a lighter material on the side walls.  Specifically recycled denim insulation.  It's cheap, readily available and easy to work with (just spray glue one side). 

And I have also found it's necessary to experiment with how much stuffing to use.  If I've lined the walls of the speaker thoroughly with NoRez and denim insulations, often times additional acoustic stuffing is not needed.  Or, very little.  You have to try it though.  Start with none, then add a bit, listen, add a bit more, listen, etc... eventually it will sound muffled.  Reduce the stuffing by 30% to 50% and you will generally hit the sweet spot.

[Danny Richie]

I have found that a combination of bracing and No Rez really works well. The bracing stiffens the cabinet up and pushes resonances up in frequency where No Rez kills it.

[Hobbsmeerkat]

Most of the times I've come across "too much" NoRez when working with customers, it's often an issue with smaller speakers where the foam layer is pressed right against the frame of the woofer, (or overlapping the woofer hole) so the woofer is having to play "though" the foam layer where it leaves the speaker sounding a bit "stuffy" or "boxy."
I can see a similar issue occurring on our tall, narrow models, like the NX-Otica as well.
On a really big box speakers, with a larger driver, it's a lot less common of an issue.

I always recommend leaving a ~1.5-2" gap gap between the NoRez and the front baffle/woofer which will allow it to breathe freely.

[jmimac351]

Most of the times I've come across "too much" NoRez when working with customers, it's often an issue with smaller speakers where the foam layer is pressed right against the frame of the woofer, (or overlapping the woofer hole) so the woofer is having to play "though" the foam layer where it leaves the speaker sounding a bit "stuffy" or "boxy."
I can see a similar issue occurring on our tall, narrow models, like the NX-Otica as well.
On a really big box speakers, with a larger driver, it's a lot less common of an issue.

I always recommend leaving a ~1.5-2" gap gap between the NoRez and the front baffle/woofer which will allow it to breathe freely.

Funny, you made me think of the new NoRez and whether I should use it instead of the original version for a project...saw this drawing explaining what you mentioned: