The Etymotic ER4XR overall has a heavy-duty build; it is nothing fancy, but is a well-built earphone with good sound quality and impressive features well worth its price.
Cable - It has nice winding style above the Y split and then below the Y split has a heavy-duty rubber coated cable that sounds pretty basic but it has a nice weight in it. The cable is about one foot longer than most cables.
Build - The ear pieces are quite lightweight. You just have to get used to the sensation of the weight being distributed along your ear canal instead of your outer ear since it has a deep insertion feature. It is made of aluminum, cable is detachable non rotating mm CX style connector, and users get a lightweight Kevlar coated cable.
Bass boost - It’s built with a custom driver, tuned to sound like the SR in the highs but with a 3 to 4 decibel bass boost in the low frequencies below 100 Hertz and I know 3 to 4 decibel bass boost in low frequencies below 100 Hertz.
Main Differences - The two in-ear designs look similar except the markings on their barrels where SR stands for Studio Reference and XR for Extended Response, which means that the difference can be seen in their frequency-response curves. SR is close to Etymotic’s original response curve for the ER4 and XR has a subtle and intentional lift to its bass response. Both are priced identically at $349
Similarity - The new Etymotic earphones the ER4 XR and the ER4SR is an extended response earphone which adds a little bit more of a bass boost. The ER4XR is similar to the ER4SR, except it slopes down into the bass around 1000 Hz. Graphing-wise, this may be exaggerated.
Performance - Both models offer deep-insertion fit giving you category-leading isolation levels and precise imaging with excellent depth recreation, extremely well-designed and constructed in-ear. Both models will sound good using the triple flange tip. They stayed in place better, requiring far less adjustment after the initial installation. The triple-flanges also had better isolation, more fully extended bass response and tighter imaging. Users can either have an earphone that has a nearly ruler-flat bass response, or one that gives a bit more low-frequency punch. Sound is about the same but flange tips last longer than foam tips. ER4XR is rock solid, neutral reference with the advantage of being portable and are great for the gym, running, commuting.
Comparison vs ER2 - ER4 is balance armature version of ER2 and not worth the upgrade. Value-wise, they are outclassed by cheaper ones but is slightly better than ER2s. For consumers that has ER2XRs, it is better to skip ER4s and buy the Blessing 2s.
Cable Connector - The old model feels a little bit beefier at least it feels like it's a little bit more rigid plastic the new model feels very good but look feels a little bit softer especially in the cord. New versions have mm CX connector. Both comes with detachable 5 foot long cable, 5 pair of ear tips, a filter removal tool, additional filters, a ¼” stereo adapter, a cable clip, and a hardshell zippered case, and each capsule has its own unique serial number. Cable style is pretty similar in design. Cable of the earpieces is braided. Cable durability can be concerning for some.
Bass Boost - ER4SR and ER4XR has a very similar body design. The primary difference between the two is the XR model has an extended bass boost and has an incredibly smooth response. SR has no impact even though there is bass. In XR, there is an impact. The difference is just about the extra bass.
Insertion - According to Etymotic, because the ER4 was designed for a deep-insertion fit that eliminated many of the characteristic colorations imposed by the beginning of the ear canal, the ER4SR and XR have an intentional boost at 2.7kHz and 5kHz, which simulates and recreates the boost that your ear (due to its shape) normally supplies to all aural stimuli.
Driver-Filter - Using a single full-range driver eliminates crossover and phase difficulties. Many earphone designers think it's practically hard to build a single full-range balanced-armature driver. Etymotic reduces frequency difficulties by using a tuned enclosure with the right volume, shape, and material. Even the removable filter on the ER4's barrel protects it from dust and moisture and muffles high-frequency sounds.
Sensitivity/Harmonic Distortion - The ER4SR had the best channel balance, but the ER4XR had the least amount of total harmonic distortion, with one driver producing an astonishingly low .15% while one of the SR drivers had the highest THD at .81%.
Sound Difference - SR sounded like hollow tin cans and differences between the two variants are only minimal. One of the headphones is famous for having a good treble response.
Frequency - According to Etymotic the ER4SR and ER4XR have identical response above about 200Hz. Below 200Hz the ER4SRs are flat until about 80Hz. The ER4XRs are flat until about 150Hz.
Performance - ER4XR produce additional bass energy compared to the ER4SR. The sensitivity of between 104 to 106dB with 200 mV drive and 45-ohms impedance the ER4 in-ears were easy for portable players.
Soundstage - The SR and XR’s dimensional characteristics are closer to the Ultimate Ears Reference Remastered, with a between-the-ears soundstage that placed each instrument with precision. Both new ER4 deliver a larger and more precise soundstage and imaging than the original
Triple Flange Tips - If you use the triple-flange tips, the isolation level of the ER4SR and XR is probably the best of any, including custom-fit in-ears. ER4 triple-flanges will stay in place but foam tips may slightly be more comfortable for some.
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