BillFitzmaurice.info

Ideally you want to run subs up to where the tops reach their excursion limit at full power, if not a little higher. Knowing where that is can be a problem.

Getting into the fine details of horn design is a topic that falls beyond the scope of our purpose here, which is to help people choose, build and use the right cabs for their needs. If you want to get into those fine details learn how to use HornResp. There are many on line sources to help with tha...

Don't. Just use a driver with the correct specs. Lowering Fs in a horn is not only unnecessary, it can be detrimental.

It does, because IMO the Simplexx porting arrangement is the best. All that differs is that they were specifically sized and tuned for the Celestion drivers.

This is the assembly video for the enclosure I designed for Celestion, using the TSQ 2145 driver. Plans are on their site, as are plans for their TSQ 1845 driver. https://www.youtube.com/watch?v=UYieLZ0XNbs

Looks OK, you'd just need to wire them series/parallel as required to get the correct impedance. You would not be able to substitute them for 8 ohm 6A drivers.

I would not use solid wood.

What you want is only one connection from the amp signal inputs to the chassis ground. If one is present via the power connection don't add another via the input wires. This only applies to unbalanced inputs, not balanced.

It could be a ground problem. When there's more than one path to ground on the inputs a ground loop can cause noise. Since the amps appear to be chassis grounded via the power supply the input wires should not be grounded at both ends of the input wires.

When I prototyped the cabs I tried various phase plug sizes for the two crossover options. What worked best is what made it into the plans.

"Aerodynamics are for those who don't know how to build engines."- Enzo Ferrari
"Eighteens are for those who don't know how to build horns."- Bill Fitzmaurice

The widest dispersion comes with the melded array.

Flip a coin. The GRS looks like a real bargain.

That will work, but you double the build time, and if the panel placements aren't precise you won't be able to get the second side on. If you end up with a thin veneer use screws when assembling so you're not relying purely on the adhesive.

Chamber reducers are not used in the T39. The 10RS430 is not a recommended driver as it's far more expensive than twelves that have higher displacement.