DIY Altec 2 Way Build ala JELabs - 802/32/414

[Jeb]

Although a flat passband response is the desired goal, a lot of times, a few dB of ripple (2~3dB) is not a bad thing depending on the application and particular woofer. A few dB of ripple can emulate a "bass boost" if needed for a particular need or again an application.

That is a very useful qualification. I suppose a ruler-flat response does not necessarily have to be the only goal, particularly with a vintage Altec system, and a modest 2–3 dB rise might provide exactly the additional bass weight that suits the particular driver and application.

For me, the main lesson is therefore not that the original port arrangement is necessarily wrong, but that it should not automatically be assumed to be optimal either. Since I have not yet built my cabinets, making the ports adjustable would allow me to compare a relatively flat alignment with one that deliberately adds a little more bass weight.

 

[FalseMetal666]

This is the 612 cabinet (and 416-8B woofer) with tuning based on the 13" x 5.5" slot port:

View attachment 123950

View attachment 123951

THANK YOU!

 

[FalseMetal666]

This is the 612 cabinet (and 416-8B woofer) with tuning based on the 13" x 5.5" slot port:

I assume that for a system where a subwoofer is contemplated, the response below would present the easiest integration? The "stock" configuration with the (low frequency bump) seems like it would make that task a bit harder, and would also create additional issues with my personal placement (i.e., right up against the front wall)...

 

[THD+N]

Yes. IMO, the 42Hz alignment would be the best one all around; sub or no sub.

 

[FalseMetal666]

Yes. IMO, the 42Hz alignment would be the best one all around; sub or no sub.

Thanks so much, I've not been able to generate reliable sims like this using internet tools, super SUPER helpful. Really appreciate it.

 

[Mike414]

WinISD is free software and easy to use.

WinISD - Linearteam