Simulating room gain for narrow directivity corner speakers (12" & XR1064)

Good day!

Im doing some corner speakers for my sauna and freetime cottage. Wall where speakers would be positioned is only 2.5 meters wide and room depth is approx 5.5 meters. Main listening spot is at other end of this narrow and deep room, so there can be lots of reflections due to narrow dimensions.

My earlier speakers here has been Woden Design Poplars (Alpair 10.3) and they were great. But if you take some beers after sauna you might want more sound power than Alpair 10.3 can give. New speakers should also have more directivity.

During years I have bought quite lot of different speaker components from fleamarkets and local hifi forums. Thisfar I have gathered these from garage:


*Woofer: 12" Audax HIF 30 HSM (Link)
*CD: Peerless by Tymphany DFM-2535R00-08 (link)
*Horn: 18sound XR1064 (60x40 degree opening)
*Flat on-wall enclosure with 85 liter volume. (these are old and uggly but I can modify them)

According to LineSource XR1064 with 60-degrees horizontal opening is best to be used with 12" woofers at approx 1300-1600Hz XO point.
I can use also 15" JBL 2226H but I think XR1064 wouldnt be so good match for it due to earlier beaming(?)

I have Minidsp 2x4HD and tweaking between XO points is no problem.

My questions concerns corner placement, room gain and taking it account when choosing sealed or BR & tuning port.

My only hint for room gain is this chart from Troels Gravesen Corner 8008 project *see attachment pic*

How and with what program I could simulate tuning for Audax 12" and then add that room gain to see combined response?
 

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