Etymotic Research ER4 In-Ear Earphones

The Etymotic Research ER4 Earphones were the first high-fidelity, noise isolating in-ear earphones to use this technology in a consumer earphone, and are recognized as the world leader for response accuracy to which all other earphones are compared. Today, this groundbreaking design is available with two unique sonic profiles: Studio Reference and Extended Response.

ER4SR - Studio Reference:

The Etymotic Research ER4SR is the reference standard in-ear monitor for those who demand nothing less than the highest fidelity. The next generation of our long revered flagship in-ear earphone, the ER4S, the ER4SR delivers increased accuracy with greater sensitivity. Like its predecessor, the ER4SR channels are matched to within an industry-leading 1dB across all frequencies from 100Hz to 10kHz. The ER4SR incorporates sleek, anodized and laser-etched aluminum bodies and braided, reinforced 5 ft. detachable cables.

The ER4SR is a must have for discerning engineers, audiophiles, and consumers wanting the most accurate in-ear monitor available. Included with every pair of ER4SR earphones is an industry-exclusive channel matching compliance graph signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers. Every pair of ER4SR earphones is assembled and tuned in the United States.

Features:
- High performance balanced armature drivers are precision matched to within 1 dB
- Sleek, anodized, laser-etched aluminum body
- Braided, reinforced 5ft detachable… read more MMCX cables
- 35-42 dB of noise isolation with a max output of 122 dB
- 2 year manufacturer's warranty provided for products purchased from authorized resellers

ER4XR - Extended Response:

The Etymotic Research ER4XR is the in-ear earphone for music lovers and hi-fi enthusiasts who want uncompromising accuracy in the midrange and high frequencies, but appreciate a bit of extra presence in the lower end. Like the ER4SR, the ER4XR is precision matched to within an industry leading 1dB across all frequencies from 100Hz to 10kHz. The ER4XR incorporates sleek, anodized, laser-etched aluminum bodies and braided, reinforced 5 ft. detachable cables.

The ER4XR is ideal for anyone looking for exceptional sound quality with just the right amount of low-end enhancement. Included with every pair of ER4XR earphones is an industry-exclusive channel matching compliance graph signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers. Every pair of ER4XR earphones is assembled and tuned in the United States.

Features:
- High performance balanced armature drivers are precision matched to within 1 dB
- Specially designed for uncompromising accuracy in the mid to high frequencies with a bit of extra presence in the lower end
- Sleek, anodized, laser-etched aluminum body
- Braided, reinforced 5ft detachable MMCX cables
- 35-42 dB of noise isolation with a max output of 122 dB
- 2 year manufacturer's warranty provided for products purchased from authorized resellers

What's in the Box?- Earphones
- Detachable, 5 ft. cord with 3.5mm gold plated stereo plug
- 1/4" stereo phone adaptor
- Assortment of eartips
- Filter removal tool and replacement filters
- Shirt clip
- Zippered storage case
- Performance certificate read less