In-room I get bass to down to around 60Hz according to my measurements with out a sub. I have the speakers about 4ft from the wall and my listening position is about 7ft back. I added an RSL Speedwoofer to fill in bass and have it crossed-over at 60Hz. I also really like the results it got with using Dirac on these speakers. They are really fun speakers and sound so different from everything else I have. When I A/B between these and a standard speaker I immediately hear the box.[/Q
But I assume that's based on Amirm's rolled-off bass? Correct me if I'm wrong, I didn't go back to check. I certainly didn't notice any lack of midbass impact on the percussion track at AXPONA.Do you know how little 80 dB SPL at 70 Hz is? It sounds as loud as 55 dB SPL at 1 kHz.
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In practice, with the MMG, I found that the practical limitation wasn't in the SPL capability of the woofer but rather intermodulation between the woofer and the tweeter. If the LRS is similar, I think you'd definitely want a sub if you like your music loud -- from what I've seen of SPL measurements people make online, most people don't play their speakers very loud at home. Personally, I found that the MMG was fine with classical, but I didn't like it with rock.