The SE315s sit at the top of their subset of Shure's earphone range, being the most expensive and - one would hope - best-sounding of the company’s single-driver products. Like the rest of Shure's SExx5 products the revamped SE315s improve over the SE310s with a more solid construction, a few design tweaks, and a slightly tweaked audio signature. The goal, as with all of the latest Shures, is improvement as opposed to revolution and, once again, it has proved successful.
Foremost these changes mean that the SE315's cables use a detachable MMCX connector, just like the SE535s and SE425s, so that the wiring and earpieces are replaceable individually if any particular part happens to break. As with their more expensive brethren, the SE315s' Kevlar-reinforced cabling feels like it will survive the rigours of regular use, walking a fine line between bulky and robust; the over-the-ear design helps keep the earpieces securely in place and eliminates microphonics.
Curiously, the earpices of the SE315s are actually a touch bulkier than the SE425s, despite the latter set packing in an extra driver per unit. That's not particularly astonishing - the drivers uses in each set are completely different - but it does mean that the SE315s aren't quite as snug in the outer ear, and as such aren't as comfortable when worn long-term; or, especially, when lying down.
Typically for a pair of Shure earphones the SE315s offer a great seal, isolating external noise, as well as giving a comfortable fit; especially with the hard foam tips - of which a choice of three sizes is provided. These are in addition to a pair each of soft foam and triple-flange tips, and three sizes of 'normal' silicone tips. The SE315s also come with an earwax cleaning tool, and a soft carrying case - complete with carabiner - but not the 3.5mm to 6.25mm adaptor that accompanies the more high-end models - no complaints here for that.