Should I even consider building

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#21
If WinISD was giving you wrong port lengths before, I think it's corrected now. Adire recommend 17 inches for my design and WinISD recommend 16.99 inches.

BillFitzmaurice, can you tell me more about your 12 dB/octave cabin gain curve please? According to Adire Audio, in a 2.3 m x 4 m x 5.5 m room, the room gain curve is more looking like +5 dB per decade, starting at around 300 Hz, +6 dB at 60 Hz, +10 dB at 20 Hz and finally +12 dB at 10 Hz.
 
#24
You didn't give your opinion about it, but I've found some information to restart a bit the debate:

At frequencies below the lowest room resonance the sound pressure will increase at a rate of 12 dB/oct for a closed box speaker that is flat under anechoic conditions, assuming that the room is completely closed and its surfaces are rigid. This case has some significance for the interior of automobiles. Under the same circumstances the sound from a dipole speaker will stay flat.

Domestic listening spaces are seldom completely closed, nor are sheet rock walls rigid, making a prediction of very low frequency in-room response extremely difficult.
Click to expand...

Only thing that we know now, is that we can't use 12 dB/octave curve in a room. That gives some more significance to the way Adire Audio approximate a room gain curve. According to them, it's more like 2.5 dB per octave starting at 300 Hz.
 
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