Correct, Craig. M2 requires the least attenuation and for high(er) SPLs only. M3, M50, M5, M100, M80v2 all require a lot more with the M50 needing less than all the others in this list. The digital LFRs require none. They are perfect at all SPLs!


House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated