Starting with gaming.​ Opening up discord and immediately being greeted by a few dudes in a VOIP channel, the first thing I noticed was the HD660S2 being absolutely clear for speech. This is great, because in this game I play on a daily basis called Squad, I always take up the role of a Squad Leader. The Squad Leader is essentially a volunteer managerial position where I need to listen to 2-4 voices through my right ear, speak with fellow squad leaders with my left ear, and have a 3rd party application like Discord taking up my center channel. At just 260g, the HD 660S2 aren’t exactly heavy (Beyerdynamic’s Amiron headphones are 340g) and they don’t weigh us down during testing. Out of the box, it’s worth noting the clamping weight is a little on the firm side, but there isn’t too much pressure and over time we’d expect this to relax a little. Additionally the texture is weighty and rounded, not as dry and thin as the HD660S while it decays in a more relaxed way helping instruments to sound full bodied and realistic in their reverberation in time and space. The transition to the treble is more smooth than the 650 and the S2 avoids the upper treble peak that many people found as irritating and harsh sounding.

Sennheiser HD 660S2 vs. HD 660S Review - Major HiFi Sennheiser HD 660S2 vs. HD 660S Review - Major HiFi

Don't ask which one is better, this is something that you must decide after carefully considering your listening habits. The HD660S2 also features more accurate imaging than the original HD660S. The HD660S’ imaging was already spectacular and laser sharp. I never struggled with pinpointing the location of gunfire based on audio positioning. But now it’s even better. The HD660S2 solidified the center image, and filled in the soundstage with multiple layers for center imaging. I no longer require turning my head of my game character to confirm if the gunshot came from in front of me or behind me. A short preview on tonality for later, the HD660S2’s treble is absolutely realistic, the bass is well textured and mids clear. Add this into the amazing imaging and everything sounds clean. I can look at a vehicle with its rumbling engine, or if a vehicle is on fire I can practically feel the .ogg file just radiating off it.Ultra-fine steel acoustic mesh baffle and ventilated magnet negate turbulence around the transducer

Sennheiser HD 660S2 Review - Headfonia Reviews Sennheiser HD 660S2 Review - Headfonia Reviews

So we are talking about a relatively narrow and claustrophobic soundscape with a strong center image but with a very sharp, precise imaging and good depth layering so as not to sound congested or one dimensional.Improving on a beloved classic while retaining its best traits was a challenging task, starting with the lowest end of the frequency plot. The HD 660S2's warm bass characteristics pair perfectly with its silky-smooth treble performance and trademark vocal presence, allowing the timbre and uniqueness of any instrument part to stand out.