AD1955DAC card for E7 only

Exclusive AD1955x2 module for LUXURY＆PRECISION E7

Following the highly acclaimed "E7 AK4497 PREMIUM," which pushed the performance of the AK4497 to its limits, the long-awaited interchangeable module, the "AD1955 DAC Card for E7," is now available. This marks the first time in the history of portable players that two of ADI's flagship DAC chips, the "AD1955," renowned for their outstanding performance in stationary devices, have been lavishly incorporated.

Through repeated prototyping and listening tests, combined with a unique LE OS, the module fully utilizes the characteristics of the acclaimed ADI DAC chip, achieving a new sound quality distinct from the AK4497-equipped card.

🔶 Unique "1955 Sound"
Faithfully reproducing the "essence of AD1955," it pursues a crystal-clear transparency and exquisite decay. Its transparent and noble sound, along with its unique linearity, will undoubtedly amaze and move many users like never before. With high-end tuning unique to the E7, which fully brings out the charm of the AD1955, you can enjoy a refined and luxurious sound in a portable format.

🔶 High quality comparable to balanced connection even with single-ended output
While conventional DAPs tend to have circuit structures where single-ended output performance is limited, this module fully utilizes all output channels of the two AD1955 chips, with all circuits, including IV conversion, LPF, volume control, and buffer amplifiers, operating at full capacity. Even with a 3.5mm single-ended jack, it delivers the same amount of information and dynamics as balanced output without compromise.

🔶 Specialized Line-out Design for EA4
Leveraging the experience from the popular limited edition model "P6Pro10th Limited," a dedicated line-out circuit optimized for the EA4 amplifier is adopted. By switching with the regular LO, combining the E7 and EA4 allows for a richness and delicacy of sound, and soundstage reproduction that surpasses stationary devices.

🔶 Discrete Automatic Bias Correction Circuit Supporting Sound Quality Consistency
A discrete automatic bias correction circuit placed around the AD1955 constantly monitors fluctuations in playback environment such as gain settings, output mode, headphone load, and ambient temperature, automatically adjusting the operating point of the analog stage in real-time. This ensures that the "true sound of the AD1955" is delivered with a consistent and ideal tonal balance and spatial expression, automatically optimized regardless of the environment.

Product Specifications (when E7 is installed)
Installed DAC: AD1955 × 2
USB-DAC supported formats: PCM: up to 24bit/192kHz, DSD: DSD128
Supported file formats: APE / AAC / ALAC / FLAC / WAV / MP3 / DSD / ISO / AIFF / SACD-ISO, etc.

■ 3.5mm Single-ended headphone output performance
S/N Ratio (A-weighted): >120dB
Dynamic Range: >120dB
THD+N: <0.0003% (24bit/96kHz)
Frequency Response: 20Hz～20kHz (±0.2dB)
Crosstalk: >75dB
Output Level: Max 2.4Vrms (effective value) / 1.1Vrms (typical)
Output Impedance: ≤0.25Ω
■ 4.4mm Balanced headphone output performance
S/N Ratio (A-weighted): >120dB
Dynamic Range: >120dB
THD+N: <0.0003% (24bit/96kHz)
Frequency Response: 20Hz～20kHz (±0.2dB)
Crosstalk: >113dB
Output Level: Max 4.75Vrms (effective value) / 2.2Vrms (typical)

■ Output Power
At 32Ω load
3.5mm output: Max 360mW
4.4mm output: Max 680mW
At 100Ω load
3.5mm output: Max 58mW
4.4mm output: Max 225mW

Accessories
Exclusive screws
Exclusive screwdriver
Cleaning sheet

*Accessories and some specifications may change without notice due to firmware updates.
*This product is for the DAC card only. It can be used with either the E7 4497 PREMIUM or E7 4497 STANDARD after updating to the latest FW.
[Please note that it may not be recognized depending on the FW version]
(AD1955 DAC card recognition is supported with firmware v1.1.2 or later)