The Monoprice M1570-Open recently went on sale for stupid-cheap, so I caved and bought it, this being the second time I've owned one. And I'm glad I have one again, if only to confirm that I was remembering it correctly, at least in terms of its bass. Because during all my struggles to get the kind of bass I was looking for out of the HE6se V2, I kept thinking, "The M1570 could do it, why can't this headphone?" and then having to doubt how accurate my memory of the M1570 was. Like, maybe I was misremembering it and expecting a kind of performance that isn't possible.
In both cases, I start with the Oratory1990 EQ with some light tweaks for each headphone, with my Bifrost 2/64 DAC. For the Hifiman, my go-to is my Onkyo AVR that's good for 160WPC, connected via balanced cable to my homemade speaker tap to 4-pin XLR adapter. For the M1570, much more simply, just a balanced cable to my Jotunheim. One of my favorite bass test tracks is "Thunder" by Prodigy.
Even with a +20db shelf on the Hifiman, I still couldn't get that visceral slam or impact that bassheads like myself expect when they hear those words used so frequently to describe a headphone. Still plenty of headroom on the Onkyo, too. But the M1570, a more "modest" +12db bass shelf, I'm finally getting a whiff of the kind of sub-bass that you can feel in your eyes. I'm sure if I pushed this as hard as +20db the thing would shake itself off my head, lol. Plus, my Jot is still only at 10 o'clock with this EQ. Miles of headroom to go.
I'm glad to have an M1570 again, if only to confirm that my memory is correct and I'm not just making it up that big open-back planars can be capable of the kind of bass I've been wanting from the HE6.
The HE6 sure is exceedingly detailed, resolving, and fast. But the M1570 is certainly no slouch in the resolution department, either, and it's a damn sight more bass-fun, that's for sure, lol. Plus, it has to be mentioned that the M1570 can achieve this with much more modest amplification and better build quality.
I've only had the M1570 back in my collection for a couple hours, I'll do more direct comparisons in the future. Nice thing is that I can have my Bifrost outputting via XLR to my Jotunheim and via RCA to my Onkyo at the same time, so I can do some real quick A/B'ing.
I don't need another headphone that can knock me silly with bass like my XB1000 or SZ2000 can do. Y'know, a raucous listening session with those and you feel like a Warner Brothers cartoon character that just took an anvil to the face: dizzy, cross-eyed, canaries flying around your head, that whole thing. I'm not looking for that extreme of a bass sensation from a planar like this, but, y'know, at least something a little reminiscent of it, but with more detail, accuracy, refinement, etc, across the whole spectrum in place of sheer bass quantity. The HE6 definitely checks the detail/accuracy/refinement boxes, but bass quantity never got anywhere near what I wanted, no matter how much EQ, despite all the talk of slam and impact in this thread. The M1570, on the other hand, this thing is clearly at least capable of silly, silly fun, lol.
Two very different characters here.