Merging Technologies / NADAC CLOCK-U

Offered here is a Merging Technologies NADAC CLOCK-U, the flagship Ultra-Low-Noise version of Merging’s reference master-clock platform. Originally retailing for approximately $40,000, the CLOCK-U was created for listeners who want the ultimate expression of Merging’s timing technology—not merely the standard CLOCK-L, but the top edition specified for still greater frequency stability and lower phase noise. The CLOCK-U uses an instrument-grade oven-controlled crystal oscillator coupled to Merging’s Q Damping System to reduce the effects of mechanical vibration. Merging specified frequency stability of ±20 parts per billion, typical short-term stability of 7E-13, and phase noise as low as -111 dBc at a 1 Hz offset. It provides a dedicated synchronization output for a Merging NADAC or PLAYER, two 10 MHz outputs for compatible high-end digital components, four standard Word Clock outputs covering sample rates from 44.1 kHz through 1.536 MHz, and RAVENNA/AES67 network connectivity. The purpose of this level of clocking is not to add a sonic effect, but to reduce timing uncertainty throughout a digital system. In his Positive Feedback report from RMAF, Brian Moura heard the Merging+Clock platform in its lower-priced Low-Noise form and described “an uncanny sense of added definition and depth to the music.” The CLOCK-U offered here is Merging’s still more ambitious Ultra-Low-Noise edition—the choice for a reference NADAC system or another compatible digital system that can accept its 10 MHz or Word Clock outputs. This silver example presents in excellent cosmetic condition, with the substantial machined chassis, display, controls, and rear-panel connections all appearing exceptionally clean. The CLOCK-U is a rare opportunity to acquire Merging’s top master clock at a fraction of its original price. Please review the photographs carefully and contact GTT with any questions regarding system compatibility or connection requirements. Key specifications Edition CLOCK-U · Ultra-Low Noise Frequency stability ±20 ppb 10 MHz short-term stability Typical 7E-13 10 MHz phase noise -111 dBc @ 1 Hz; -135 dBc @ 10 Hz; -145 dBc @ 100 Hz Clock connections Dedicated NADAC/PLAYER sync; two 10 MHz outputs; four Word Clock outputs; RAVENNA/AES67 Word Clock range 44.1 kHz to 1.536 MHz Dimensions 435 × 435 × 95 mm Weight 11 kg / approximately 24.3 lb Recommended warm-up Two hours for full CLOCK-U stabilization