If the other Axiom ported subs are like my 125v4, listeners may have a real conundrum on their hands. I like the 125v4. And I like the 500. That's the conundrum. In fact, I like the 125v4 better on some tracks than the 500. For example, Another one bites the dust sounds better to me on the dual 125v4/M2OW combo than on the dual 500v4 and 800v4 I have in my main room with the active LFR1100. The bass is far more engaging on the 125v4. It has to do with the perceived greater mid-bass but not so "peaky" that it is of the one-note type or distracting or over-whelming.

This 125v4 is just a terrific sub whether you're comparing sealed or ported. It's so good that it has me thinking about whether I should forego two more 500s in my main room and go with ported Axiom subs instead.

I still have two 600s coming BTW.

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