This Headphone Package includes:
- 1 - Koss ESP950 Electrostatic Stereophone System Headphones
- 1 - Audioquest DragonFly Red v1.0 USB Digital-to-Analog Converter
- 1 - Audioquest JitterBug Dual Function USB Data and Power Noise Filter
ESP950 Electrostatic Stereophone System Headphones
The ESP950 Electrostatic Stereophone System is the pinnacle of audio reproduction. The standard upon which all other electrostatic headphones can be measured. A professional listening system so distortion free, it literally pushes the limits of the world's most sophisticated instruments that attempt to measure its performance. The result is an experience that no other stereo system can approach. A revolutionary design in electrostatic transducers which includes cross matched mechanical damping and semi-conductive coating. The result is an ultra-flat frequency response across the entire range: deep, clean bass with real power that other attempts at electrostatic transducers can only envy. You would expect nothing less from the people who introduced the world to private listening with its first SP3 stereophone in 1958.
The ESP includes the Electrostatic Stereophone, energizer, battery pack, leather carrying case, connecting cables, and 120 VAC adapter. This unit is equipped with soft, vinyl closed ear cushion design for isolation. The Electrostatic Stereophone features pivoting ear cups and adjustable, detachable headband for comfort and convenience. The ESP950 has a straight, dual entry 4 foot cord/6 foot extension.
Built to last, the ESP950 is covered under Koss Limited Lifetime Warranty - the only warranty of its kind in the stereophone industry.
DragonFly Red v1.0 USB Digital-to-Analog Converter
DragonFly Red is a USB digital-to-analog converter (DAC) designed to deliver cleaner, clearer, more naturally beautiful sound from any computer, smartphone, or tablet. DragonFly Red’s unique design allows for playback of any file type regardless of resolution. Natively, DragonFly Red is capable of decoding 24-bit/96kHz data.
DragonFly Red employs a unique clock system called a Hybrid-PLL. While not discrete, the Hybrid-PLL performs equal to, or better than, many discrete clock systems, at a fraction of their cost. Additionally, DragonFly Red is software upgradable.
DragonFly Red DAC Features:
- Plays all music files: MP3 to high-res
- Compatible with Apple and Windows PCs, as well as iOS and Android mobile devices (requires Apple Camera Adapter or Made for Android/OTG adaptor)
- Drives headphones directly
- Fixed output feeds preamp or AV receiver
- Asynchronous transfer ensures digital timing integrity
- High output (2.1 volts) drives almost all headphones, including power-hungry models
- 32-bit ESS 9016 DAC with minimum-phase filter
- Bit-perfect digital volume control
JitterBug Dual Function USB Data and Power Noise Filter
AudioQuest’s new dual-function JitterBug is a USB line (VBUS) and signal (data) filter. JitterBug follows the footsteps of AudioQuest's award-winning, category-defining DragonFly USB DAC, and their best-in-class, USB, Ethernet, FireWire and Thunderbolt digital interconnects, promising the next step forward in high-performance computer-audio playback.
While USB (along with Ethernet) has become one of the two most important and widely adopted interfaces in the age of computer audio, it does come with its own unique sets of liabilities—mainly sound-degrading noise currents. All computing devices, whether they be laptops, phones, NAS or even dedicated “music servers,” inherently generate a significant amount of noise and parasitic resonances. In addition to this, many computers (the least offensive being laptops, as they are required to meet rigorous safety standards) can and often do contribute a considerable amount or RFI and EMI pollution onto the signal paths—all of which can easily find its way onto your USB cables and into your audio system. This noise and interference has many negative effects. Noise-compromised digital circuitry increases jitter (dispersion in time) and packet errors, resulting in distortion that causes a comparatively flat and irritating sound. Noise-compromised analog circuitry also damages the sound’s depth, warmth, and resolution.
Fortunately, AudioQuest has devised a solution for dealing with these liabilities. JitterBug’s dual-circuitry measurably reduces unwanted noise currents and parasitic resonances. It also reduces jitter and packet errors (in some cases, packet errors are completely eliminated.) The result is clearer, more compelling sound, music, and dialogue — a better audio experience.
Slightly smaller than their DragonFly USB DAC, and with a handsome, unassuming appearance, JitterBug has a USB (male) plug on one end and a USB (female) port on the opposite. For those who already own DragonFly, JitterBug will be a fun and affordable upgrade: Simply plug JitterBug into any one of a computer’s available USB ports, then plug DragonFly into JitterBug’s USB port.
But JitterBug is far more than an obvious partner for DragonFly. In fact, its versatility may very well match that of the USB standard itself: JitterBug can be successfully used with external USB DACs ranging from the very modest to the absolute state of the art. Simply plug JitterBug into an available USB port, and use a USB cable to connect JitterBug to the DAC of choice.
Many computers include more than one USB port. For additional improvement to a system’s overall sound, a second JitterBug can be used in parallel (but not in series) with the first. The improvement is audible through the active audio port, whether or not the second JitterBug fills an empty USB port, or is used in series with some other peripheral, such as a printer.
Note: They recommend no more than two JitterBug filters per USB bus. If you do not know how many USB buses exist on a given device, err on the side of caution: Presume that there is a single bus and use no more than two JitterBugs.
JitterBug can also be used with mobile phones, portable media devices, USB peripherals, and network storage/streaming devices. Many receivers, DACs, and automobiles include USB input ports that are compatible with iOS and Android devices, enabling music lovers to use their mobile phones or USB memory sticks as audio sources. By first plugging a JitterBug into the associated USB input port, the playback performance of such media devices can be significantly improved. In cases where a noisy external computer peripheral (such as a printer, camera, or hard drive) must be connected to a computer-audio system, JitterBug can be used in series with the peripheral device. Similarly, streamers, Network Attached Storage devices, and routers may all include USB ports, and all can benefit from JitterBug’s noise filtering—again, regardless of whether the associated port has a device connected to it.
Simply put, JitterBug’s dual-circuitry measurably reduces the noise and ringing that plague both the data and power lines of USB ports. As with many things in audio, the effect of JitterBug on the overall sound of a system may vary slightly, depending on the associated gear and application. Experimentation is enthusiastically encouraged. The results will likely prove more than worth the effort.
- For use in series (in line) with any computer and USB DAC (digital-to-analog converter)
- For use with computer peripherals, mobile phones and media devices, and network streaming and storage devices
- Reduces the noise and ringing that plague both the data and power lines of USB ports
- Measurably reduces jitter and packet errors
- Improves dynamic contrast, warmth, and resolution
- Use one JitterBug in series (in line) with any computer and USB DAC (digital-to-analog converter).
- Use an additional JitterBug in parallel with the first for improved playback performance.
- Use JitterBug with other locally connected USB devices, such as hard drives, printers, and cameras, to effectively reduce audio interference.
- Use JitterBug with USB-enabled network devices, such as routers, NAS devices, and streamers.
- Use JitterBug with mobile devices into audio systems in the home and in the car.
Koss ESP950 Specfications:
- Frequency Response 8-35,000 Hz
- Impedance 100k ohms
- Sensitivity 104 dB SPL/1mW
- Distortion <0.01%
- Cord Straight, Dual Entry, 4ft