10" Front loaded sub design THE RADIHORN

Hello everyone,
I am a newbie with a project in mind, but I'm full of doubts and I need your expert opinion to see if it can work.
I have two 10" car subs (AUDIO SYSTEM - RADION 10 PLUS) and I found a plan of an old 10" back-loaded horn that I have slightly changed by reversing the cone and adding a closed rear chamber.

The result is the following:



I tryed to model it with hornresp with the following results:







I also imported it in Akabak to simulate subsonic filter and low pass filter.
High pass 35Hz 24db - Low pass 85Hz 24db


The music I like is reggae roots and dub and I want to use it both outdoor and indoor.
I know it is ONLY a 10" so I don't expect to destroy buildings with two of these horns.
Just some good bass (at least louder than a 60L with Fb 35Hz).

My first and greatest doubt is about group delay peaks at 40Hz and ~100Hz. Mainly the ~100Hz one!
The only horn I've heard is PD1850 SUPER SCOOPER which for my ears is fast enough when playing dub music.
I know that 10" is not 18" but what I want to understand is if group delay is so bad.
I found this simulation with hornresp and you can see that group delay is quite similar (PD1850 black - RADION10PLUS grey).

I can also add a delay of ~8/10ms on the mid-highs so that group delay between 60-80Hz can be considered as near 0ms.

Second doubt is about cone displacement.
If xmax is 8mm can I consider 10-12mm to be the xmech?
What happens in sealed rear chamber with displacement greater than xmax? Will the sub get too "hot"?
Is a rear vented chamber tuned to about 30Hz a good idea?
Even lower to take port group delay peak not over the 40Hz existing group delay.

Third doubt is about the wood thickness and foldings.
Is 16mm chipboard acceptable without bracing? Internal cab width is 40cm.
Are there too many folds in your opinion? Will they change the response too much?

I'd be really grateful if you help me with your answers and your comments.
If I said too much rubbish please correct me as much as you can.

Thanks in advance.

Bit of a waste of space in the middle isnt it? you could have the magnet of the driver facing the \ angled panel with the access door in there and subsequently either shorten the height of the cab keeping the same length horn or extend the horn length by about another 2 folds.

Thanks for your quick reply.
You are right about the waste of space but I'm not so expert in cutting wood so it would be much easier for me to make it in this way because most of the panels are 90 degrees.
For the moment I can consider the height acceptable but for sure this could be a good improvement.
What do you think about my doubts?
Thanks again for your reply
   

drbis84 wrote: I already had the same idea and tried to understand the principles of Stasys obviously with no result.

Its quite easy to understand. It has four tuned ports - or resonators / resonant chambers as Rog has called them. A shared rear chamber for the 2 * 18" housing that is also seen as another resonant chamber equalling 'five resonant chambers'

The drivers fire into a horn and share the final part of the horn path with each other.

Its made out of wood and it has speakers inside it, there is no wizardry involved.

In fact it shares many properties that this guys design does. Just with different positioning for the ports.