[Martin Garrish]

Hi, all.

I'm currently developing a pair of transmission line cabinets for small fullrange drivers using the latest computer methods. I have run into problems with midrange leakage from the TL port before I can decouple the line from the driver. Some additional calculations tell me that I could use No-Rez damper sheet/foam to increase the TL cross section depth without altering the acoustic impedance. The problem is that I don't know the acoustic properties of No-Rez, and I can't search this forum until I've put in three posts.

Can anyone tell me their experience of how lining a cabinet with No-Rez affected the volume for Thiele-Small parameters? I imagine that like the GAW fibre I favour the volume reduction is actually compensated by the change from adiabatic to isothermal compression. So for example lining a reflex cabinet with No-Rez actually has no effect on the cabinet acoustic volume (compliance).

Thanks,

Mart

[Danny Richie]

So for example lining a reflex cabinet with No-Rez actually has no effect on the cabinet acoustic volume (compliance).

That is correct.

[Martin Garrish]

Much obliged, Danny.

Found the videos I was after.
Video on NoRez: https://www.youtube.com/watch?v=uDXC6TkaQ1E&t=8s
Video on poly-fil: https://www.youtube.com/watch?v=QvQRRU68FM4

Found a neat acoustic trick using just poly-fil to keep that pesky midrange inside the cabinet. Any advice on cabinet size adjustment for poly-fil?

Ideally, these TLs will be the most boring speaker ever developed - the excitement is in hearing every detail of the music...

Mart