KTE SU-2 : Kitsune Tuned Edition – DSD1024 USB Digital Interface Femto second clock Interface – 3.2uV/2.0uV output noise, 125db PSRR

KTE SU-2 is a Kitsune Tuned Edition of the very popular Singxer SU2 and it includes a total of five regulators (Three discrete regulators(w/heatsinks) and two surface mount regulator upgrades), one for 5v PSU, and the others for the 3.3v for digital outputs and two surface mount regulators for the clocks. Mundorf Supreme 9.5% silver solder used for all components upgrades. OSCON Ultra low ESR caps, MB mods, air dialectric SPC solid core hookup wire, silver HifiTuning fuse, Vishay film caps, Kycon High Retention USB connector to improve connection quality/impedance, graphene enhanced contacts for IEC, Fuse and connections, internal connectors and usb connector. Surface mount regulators are upgraded for the two Femto clocks with better than 6uV output noise. Vishay Film caps used in PSU and ultra high performance discrete regulators for both 5V(PSU) and 3.3V(digital outputs) – 3.2uV output noise or less (lower voltage is less noise… 3.3v is approx 2uV output noise), -125db PSRR (power supply rejection ratio) compared to the stock regulators @ 150uV output noise and -70db PSRR approx.

KTE SU-2 has custom Solid copper emblems. Each unit is individually serialized. Each unit is modded by hand and burned in for 72 hours before returning to the customer.

Feel free to email Tim for any specific questions on this product.

SHIPS FROM USA! Tim Connor does the mods on these KTE editions and they have about a 10 business day build time. They can be special ordered and just expect about 10 days from date of purchase it will ship out, however if any reason we are backed up, i’ll email you right away to let you know status.

These are limited run and scheduled for builds. I have only so much time and must control the sales of these items. Thank you for your patience and understanding. These are simply a labor of love! My passion for audio and several customer’s requests have allowed this product to be possible.

This actually is one of our best selling products on the website and due to extremely high demand I’ve worked hard to deliver these. I believe you’ll be quite thrilled with the sonic improvements this will bring to your system!

The SU-2 digital interface is a high-performance USB digital audio interface. The microprocessor with the latest ARM Cortex-M4 as the core is used as the main control of the USB data part. SU-2 uses a self-developed ultra-low jitter clock system (ACCUSILICON’s AS-318B series, which achieves ultra-low jitter at the femtosecond level). A large-capacity FPGA serves as the digital audio data processing core and has a standard USB2.0 input interface. Rich output interface, including XLR balanced output AES, coaxial RCA and BNC, I2S interface with HDMI socket output (custom 4way I2S circuit that improves sounds quality and reduces jitter), perfect master clock and word clock (WCLK) output. SU-2 supports external 10Mhz clock input, using common 50 ohm input impedance design.

The SU-2 is not only a USB interface, it can also be used as an independent master clock product.

1. When used as an independent master clock, it can output a word clock of 44.1K-384K, or output a master clock of 22.5792Mhz-49.152Mhz. (When not connected to USB, it will be used as the master clock device by default)

2. When using an external 10Mhz clock input, it can also be used as a frequency converter; support 10Mhz to 44.1K-384K word clock, or output 22.5792Mhz-49.152Mhz master clock.

SU-2 is a new architecture USB interface developed by us to replace the original SU-1; PCM sampling rate supports up to PCM 768K, and DSD supports up to DSD1024. Using a large FPGA as the core of the processing processing, we decentralized some of the FPGA algorithm technology of the flagship interface SU-6 to the SU-2; its positioning in the mid-to-high-end interface mainly uses the following three unique technologies:

1. Full isolation technology (ground isolation), using 150Mbps full isolation chip, can completely isolate the interference from the PC;

2. Source synchronization technology and FPGA shaping technology, reshape the I2S signal after isolation; thus eliminating the additive jitter brought by the isolation chip;

3. Self-developed clock system, using ACCUSILICON high-performance crystal oscillator, low phase noise, low jitter; you can also choose external 10Mhz clock, support various atomic clocks, constant temperature crystal, GPDSO input.

This product supports two kinds of AC power voltage, 230V and 115V respectively. Please choose the volts suitable for your country’s voltage.

The driver was updated in June 2019. The latest version is V4.67. The latest driver supports DSD1024 and DSD NATIVE modes.

We attach great importance to the design of power supply circuits, using LDOs with high performance, low noise and fast response as the main power supply. The entire board uses multiple independent LDO power supplies, and the clock part even uses ADI’s ultra-low noise LDO, which lays a solid foundation for ensuring the ultimate output performance. (KTE SU2 has vastly improved discrete voltage regulators)

The PCB main board adopts a 4-layer circuit board design to ensure a complete ground plane and power layer. A high-speed digital design method is used to ensure the signal integrity and power integrity of the entire board. The clock signal is specially processed, and the grounded design and precise impedance control are adopted to ensure the clock signal quality and improve its anti-interference ability. The input and output signals follow the standard design, especially the USB high-speed signals use 90 ohm differential impedance control.