I know the problem well! I haven't been able to use my shop for years now and even with some help of others, 'life' keeps getting in way of building a complete new roof and repair the damaged support walls. I'm surprised that listening so far off axis sounds acceptable with such beaming speakers, though for such a high efficiency near-field app they can be frequency shaped with EQ to be ~flat from as low as ~0.7x the cab's Fb which should provide plenty of bass 'weight'.
GM





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