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by Jerry Harvey Audio Diana

Beautiful both inside and out

Diana is a product created by combining the world renowned IEM technology of Jerry Harvey Audio, which has long been making custom earphones for musicians around the world, and the expertise of Astell&Kern reputed for their quality products made in Korea.

Diana features the patented Freqphase from Jerry Harvey Audio and the same new sound bore design applied to Billie Jean. Its impeccably beautiful full metal shell made from aluminum with great precision not only delivers a visually impressive image but also makes the sound more solid so you enjoy the most ideal sound without distortion in all sound ranges.

The 3-Way 3-Drivers, optimized size, plus silver tinsel and anaerobic copper cables used in high-end top cables, come together to provide outstanding sound that cannot be matched in existing IEM products.

Meet Diana, the newest triple driver Universal fit IEM from Astell&Kern and Jerry Harvey Audio. Jerry designed the Diana as a reference earphone, tuned with the audiophile in mind, and a perfect complement to any Astel&Kern player. Diana offers a flat, detailed response; great for critical listeners who also want a well-balanced and wide soundstage, incomparable dynamic range and Jerry Harvey Audio’s patented Freqphase™ technology.

Created by utilizing some of the most advanced design and assembly techniques in the industry, Diana features the newest generation of ergonomic body style, for a better fit and more comfortable listening experience. With the all-new ergonomic body, machined from aluminum and beautifully finished with Red and Clear anodized coating, Diana is the best fitting, most striking earphone from Astell&Kern yet.

Diana also features JHA’s Patent Pending Acoustic Chamber Sound Bore, first used in the Billie Jean IEM, which extends and smooths high frequencies and reduces maintenance needs due to sweat and ear wax.

– Jerry Harvey


Technology for Diana



Jerry Harvey Audio has developed a whole new Balanced Armature Driver to offer reference quality IEMs for mastering and mixing works. The high-range drivers are designed to deliver everything with minimum distortion, while the ultimate mid driver offers perfect, flat sound from 10Hz to 5kHz. The bass driver was designed for an even steeper low-pass effect with no distortion.


Freqphase™ Time | Phase Waveguide

Most Multiple Driver IEM's suffer from phase and timing issues. Low, Mid, and High drivers all have different impulse times. The higher it is, the faster the impulse time of the BA Driver. The lower it is, the slower the response speed. This causes improper arrival times and Phase shifts.

The "Diana" applies Jerry Harvey Audio's patented "Freqphase" technology, which uses precisely cut tube lengths for each driver to minimize the phase shift of each frequency. This allows for the High, Mid, and Low drivers to be aligned to 1/100ms for the most ideal phase curve. It ensures the correct time alignment and phase of all drivers resulting the most accurate music reproduction in the industry.


3Way 3BA Drivers

The balanced armature drivers used in Diana are smaller and incredibly more efficient than conventional dynamic drivers. Three balanced armature drivers with optimized tuning are elaborately designed and integrated with Freqphase, Timephase, and Waveguide technologies which deliver crystal clear sound in all sound ranges.

In particular, the Acoustic Chamber Sound Bore design of Jerry Harvey Audio has been crafted and applied to Diana. This design creates the full amount of air needed to deliver sound, making it more optimized for treble. It also prevents sweat and dirt from accumulating in the sound bore. Experience Diana and hear music at its finest.

High Quality Full Metal Shell

Diana’s sleek design is carefully crafted from aluminum through multiple steps. The design flowing from the Sound Bore, body, to the logo on the shell boasts excellent durability thanks to the aluminum which is as strong as it is beautiful and light. It will be the best choice for those who seek a perfect IEM and demand the ultimate in sound, design and durability.

Siren Series is the perfect product for sound monitoring by professional musicians. The design reflects years of studying the multiple shapes of the ear canal to ensure listeners are provided with authentic sounds. Capturing all the experience and know-how of Jerry Harvey Audio’s Custom IEMs, the Universal Fit Diana offers the best fit and comfort for audiophiles everywhere.

4N pure silver and 7N OCC copper hybrid
2.5mm 4-pole cable

The cable included with - and designed and tuned especially for – the Astell&Kern Diana is a very special headphone cable – an 8-conductor wire of awesome sound. It’s made with 4N pure silver with silver plated 7N OCC to deliver the high in this combination; and the 7N OCC to bring the low. This hybrid construction of pure silver, silver OCC and OCC litz creates a unique harmony and is the finishing touch to Diana’s excellence. No more sharp highs or too much bass: bring perfect balance to your music with this unique cable.

Silver Plated Single Crystal Copper Wire
+ Silver Wire 0.05 26PCS + 0.08 10PCS
Single Crystal Copper Wire 0.05 OCC 26PCS
+0.08 OCC 10PCS
High Tension Fiber 400D for All Filler Jacket Non-migraion TPU pass RoHS