6.5" enclosure slot

[wickette]

I was breaking down my pile of crappy speakers for parts. One of the vintage speakers had the driver mounted behind this honey comb hole pattern. This is a lot easier than trying to cut a perfect six-in circle. I assume it has drawbacks does anyone know what they are?

 

[GM]

It creates a low pass filter, rolling off the driver's HF in lieu of using a choke, i.e. if the rear chamber is sealed as implied by the 'Air Suspension System' it makes it technically a 4th order band-pass (BP4) alignment in speaker box design 'parlance'/'speak' 😉, so no 'drawbacks' per se unless of course you (over) drive the woofer/acoustic choke to audible distortion and/or want to hear all of its HF output comb filtering with the tweeter's output.

 

[wickette]

It creates a low pass filter, rolling off the driver's HF in lieu of using a choke, i.e. if the rear chamber is sealed as implied by the 'Air Suspension System' it makes it technically a 4th order band-pass (BP4) alignment in speaker box design 'parlance'/'speak' 😉, so no 'drawbacks' per se unless of course you (over) drive the woofer/acoustic choke to audible distortion and/or want to hear all of its HF output comb filtering with the tweeter's output.

Interesting, I just figured it was cheaper to manufacture it this way (these are particularly low quality).


Is it just that the total opening area being smaller (than 1 big hole) creating a choke => creating low pass filtering. Or does the size of the holes contributing?

 

[GM]

Yes, it's about adding acoustic resistance to get the desired HF roll-off Vs just a notched choke, AKA creating a compression ratio that will boost some portion of its HF BW, i.e. compression loaded horns.