In this video I review the new iFi x Drop stack made specifically for the Sennheiser HD6XX: the Zen Can Signature 6XX amp and the Zen DAC Signature. iFi loaned me early samples, and I even reshot the review after Drop updated the listing so I could give you the most accurate info. I break down the basics (both units are Drop exclusives, both hover around $249 each, and the whole stack is balanced via 4.4mm), then I go over the build—nice anodized “midnight blue” chassis, but the buttons on my samples felt kind of cheap and a bit inconsistent. The big story is the feature set. The amp’s HD6XX EQ button is genuinely interesting: it’s basically there to counter the HD6XX bass roll-off, and it actually worked better than I expected with surprisingly little distortion—getting real sub-bass extension out of a 600-series headphone is wild. The 3D setting is more subtle than other iFi implementations, but it can help a bit if you find the 6XX claustrophobic. The downside is the pricing: at roughly a $500 stack, you’re competing with heavy hitters (789, Asgard 3 + Modius, SP200, Element stack, etc.). I think the amp is the easier recommendation for certain use cases, but I struggle to recommend the DAC because of its softened/blunted transients and “warm bright” Burr-Brown character at this price.