Which is better? Lower frequency N11+2 or a combination of N11+4 Normal & Inverse

[Kezzy]

Hi there,

I'm building 4 QRDs for my studio. As I rent, I want to design panels that will be effective in a variety of small and medium rooms. My current space is approximately 3.5M x 3.8M with a 2.8M ceiling

My proposed design is:

N11 panels:
Maximum Well depth 150mm
Well width: 45mm
Divider width: 4mm
Period Width: 539mm

If I use an N11+2 configuration I get a design frequency of 729Hz

However if I wanted to build some inverse panels to mix it up and have them all be the same depth, then I would need N11+4 which would have a higher design frequency of 940Hz

My question is: Which is better?

4 x N11+2 @ 729Hz...

Or a mixture of 4 x Normal and Inverse N11+4 @ 940Hz...

The panels will be hung on the rear and side walls as my room is used for mixing and tracking. At the moment only have space to place up to two panels side by side.

Thanks.

[localhost127]

Originally Posted by Kezzy

Hi there,

I'm building 4 QRDs for my studio. As I rent, I want to design panels that will be effective in a variety of small and medium rooms. My current space is approximately 3.5M x 3.8M with a 2.8M ceiling

My proposed design is:

N11 panels:
Maximum Well depth 150mm
Well width: 45mm
Divider width: 4mm
Period Width: 539mm

If I use an N11+2 configuration I get a design frequency of 729Hz

However if I wanted to build some inverse panels to mix it up and have them all be the same depth, then I would need N11+4 which would have a higher design frequency of 940Hz

My question is: Which is better?

4 x N11+2 @ 729Hz...

Or a mixture of 4 x Normal and Inverse N11+4 @ 940Hz...

The panels will be hung on the rear and side walls as my room is used for mixing and tracking. At the moment only have space to place up to two panels side by side.

Thanks.

N13+4 is a solid design and greatly minimizes well depth.
could you squeeze an N13 in (considering your width constraints)?

the lower design freq would be better (N11+2) - i dont think you have a need for inverse panels merely for "mixing it up" unless you have multiple periods in an array and need to adhere to the barker code.

[Kezzy]

Thanks for your reply, i have decided to use 6mm MDF to increase rigidity. I need the panels to be as close to 600mm wide as possible so I now have two options:

Build N13+4s with 41mm wide wells

Or N11+2 with 49mm wide wells

Which would be better? Given that the N11+2 would also require a little less cutting and sticking.

[localhost127]

Originally Posted by Kezzy

Build N13+4s with 41mm wide wells

Or N11+2 with 49mm wide wells

Which would be better? Given that the N11+2 would also require a little less cutting and sticking.

the 41mm wells will give you a higher HF cut-off freq as well...

[Kezzy]

Sure. But isn't there a point where wells start to get too narrow and can cause problems? I thought that occurred around 40mm?