Since I got my SP-51's, I'm loving them! I've been using the black plate and the bass is nice, deep, full and impactful. The treble could be a tad more forward, but I'm mostly listening to drum and bass so it's ok. My only complaint is it's time consuming getting a perfect seal with them. Too far in or not far in enough I lose bass, and sometimes when I get a good seal, they need to be readjusted again if I'm moving around or exercising with them.
I just got a new Atrio X which hasn't burned in yet, but they are easier to get a seal with and stay in place even if I'm exercising with them. But the bass isn't as deep and impactful as the SP-51's, although the sub-bass frequencies seem to be more cleanly separated. I don't know if the bass will become deeper after burn-in as I've only listened to them for about 15 hours now.
I was wondering if you could recommend an upgrade to the SP-51's in terms of bass quantity and quality. Is there anything deeper and more impactful and also stays put if I'm exercising? I'd like an earphone that would be quite offensive to a non-basshead. Smooth sound signature and non-fatiguing like the SP-51's.
In terms of pricing, I'd like it to be <$70. Black Friday is coming up so I'm thinking earphones that normally go for $110 might work. Is there anything that would be a MAJOR upgrade from the SP-51's or is everything just a minor upgrade at this point? I was looking at the Munitio 9 MM billets, I think they're the cheaper versions of the SITi ones you reviewed before, but audio response graphs for both sets look identical. They also come with earhooks which I hope keep them in place when I'm active.
EDIT: Or should I look into an amp...maybe a ZO2? My source right now is a Sony NWZ E354 mp3 player.
Edited by DnB Sublimity - 11/19/11 at 4:50pm