Isn't the 4 screw meant to have less bass impact than the 6 screw?
Is the difference for bass impact between 4 and 6 screw more or less than the difference between 4 screw and HE6SE?
Can't say, but I blew up the claim by HFM that the 6 SE was the same as the HE-6 6 screw 11/19: (with edits - some for readability, others because at the time I had very low VAC into my home, so the some comments on mids and highs were changed when I got the same 6 screw in my hands later when the VAC was back).
They are not the same, sibling - sure.
1. Cables are different, the 6SE are trash, the original 6 appears to be prone to oxidation, but was built on a better scale.
2. Pads as supplied different
3. bodies - different, so different resonances.
4. headbands different - more resonances
5. Shape of the ear facing magnets different
6. Also original has the 1/4 flap to cut resonances, and additional damping fluff, 6SE does NOT, nor any "fuzzor" type change to make up for it;
7. more glue used on 6SE
8. Tension on the membrane said to be different, and who is to say the membrane is the same thickness?
From a marketing POV it's much better for HFM to play up "it's the same" angle to connect this product with a legendary one. After all who wants "new Coke" over "original Coke".
On the listening side using the same equipment (Cambridge CXC -> Calrad SPC coax -> Gumby A1 -> XLR -> Rag 1
* Stock HE-6 (felt pads, stock cable, 1/4 flap removed) vs HE6SE (stock pads and cable), the differences are not subtle.
* SE6SE bass faster, HE-6 bass under 40 Hz growls better and holds up to 20 Hz better;
sudden "eye shutting" transients frequent on the 6 screw, not present on the SE.
* HE6 has some ringing between 9kHz-11kHz, which draw out the decay of cymbals
* HE-6's sound more aggressive - esp the treble which seems to have too much in the way of odd order harmonics.
6 SE: I've tried Mr Speakers Ether Angled pads and the fuzzor mod on both - wider soundstage and better articulation in the highs for both.