Ultimate Ears Sound Guard + Etymotic ER4XR Extended Range Ear Buds Bundle

Ultimate Ears Sound Guard + Etymotic Research ER4XR Studio Reference In-Ear Monitors 
What’s In the Box?

• ER4XR Extended Response earphones - 846430002029
• Assorted eartips and 1/4" stereo phone adapter.
• Filter removal tool and replacement filters.
• Shirt Clip and Carrying Case.
• Performance Certificate.
• Sound Guard - 097855113825
• 2 x extra lithium battery (CR2450 3V)
• 3.5mm stereo input cable
• User Manual (including 24 months warranty registration information)

Etymotic Research ER4XR Extended Range In-Ear Monitors

Highlights

• Detachable 5 ft cables
• High performance balanced-armature drivers
• Sleek driver bodies with anodized finish
• Braided cables for reduced microphonic effect

ER4XR Extended Response The World's Most Accurate Earphones Just Got Better! Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic's original design, developed for auditory research and hearing testing, used balanced-armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones.
Why Etymotic? Etymotic designs products to measure, improve and protect hearing, and enhance the listening experience of music lovers everywhere. Audio engineers, musicians and audiologists at Etymotic have generated over 100 patents issued and pending.
Why ER4XR Extended Response? ER4XR is the earphone for music lovers and hi-fi enthusiasts who want uncompromising accuracy in the mid-range and high frequencies, but appreciate a bit of extra presence in the lower end.
The ER4XR incorporates the stringent channel matching standard used in the ER4SR and is built with precision machined, anodized and laser-etched aluminum bodies, and features user-replaceable detachable cables.
The ER4XR is ideal for anyone looking for exceptional sound quality with just the right amount of low-end enhancement.
Features

• Detachable 5 foot cable
• High performance balanced-armature drivers
• Sleek driver bodies with anodized finish
• Braided cables for reduced microphonic effect

Specifications

• Frequency response 20Hz-16kHz
• Channel matched to within 1dB from 100Hz-10kHz
• 35-42 dB noise isolation
• Impedance 45 ohms
• Sensitivity: 98 dB SPL at 1kHz, 0.1V drive level
• 122 dB maximum output
• Assembled and precision matched in the United States

User Detachable Cables To detach the cables, pull the cable connector away from the earphone body. Pull straight out-Do Not Twist.
To attach the cables, align the key tab on the cable connector with the notch in the body of the earphone. Press together until it snaps in place.
Changing the Filters Etymotic earphones have special filters that smooth the frequency response and prevent earwax from entering the earphones. The filters are located at the end of the earphone and are visible when the eartip is removed. When a filter becomes clogged it should be replaced. Filters should be changed when output decreases or sound quality declines.

Ultimate Ears Sound Guard
In-ear monitors are becoming more and more ubiquitous every day and wireless hardware systems are coming down in price, opening the market to a wide range of users, some fairly sophisticated about audio and other not so knowledgeable. In the hands of a trained pro monitor mixer who understands the needs and limitations of IEM systems (and users) the need for an in-line brick wall protection limiter may not be so important.
However, at any gig – at any level – stuff does happen, although hopefully less frequently as you get up the production food chain, but when a show is live, sometimes all bets are off. Examples of transient high-level audio glitches can include unexpected sound spikes that occur from microphone drops, audio feedback, incorrect volume settings, pulling the plug on a condenser mic when it's powered up and any other sound hazards that may occur during a performance.
Unfortunately, when you're wearing a set of in-ears, you may be guaranteed an up-close and personal front row seat to that spike or sudden sound blast, which is anything but pleasant. And that's exactly what the Sound Guard from Ultimate Ears Pro is designed to protect from.
With the UE Pro Sound Guard, artists receive protection from unexpected sound spikes that occur from microphone drops, audio feedback, incorrect volume settings and other sound hazards that may occur while performing or recording. So far, so good; but there's more going on here.
Matching impedance of balanced armatures with multi-way crossovers can be complex and certain personal monitoring/mixing systems don't handle such IEM designs – from any manufacturer – very well. Beyond its protection duties, Sound Guard also functions as an audio buffer that provides variable impedance matching from the source device to your balanced armature IEM earpieces (such as the UE Pro line) for enhanced dynamic range and improved sound quality. And although Sound Guard is intended specifically for those UE Pro IEM's, it can function with any balanced armature design.
Housed in a compact 2-by-2-inch plastic box that's about a half-inch thick, the Sound Guard definitely gets points for being compact. There are two 1/8-inch stereo TRS jacks (input and output) on either side of the unit, which connect in-line via an included 6-inch TRS patch cable to your IEM receiver (or hardwire personal mixer), with the output jack going to your earpieces. The Sound Guard box has a recessed on/off switch and two LED's to indicate power-on and batterycondition.

Tech Specs
Frequency response: 20 Hz – 20 kHz
Battery life: ~20 hours on a pair of CR2450 batteries Gain: Unity Gain
Output connector: 1/8” stereo headphone jack
Input connector: 1/8” stereo headphone jack
Warranty: 1 Year