Intro Last year, HiBy released the RS6 digital audio player – a solid, full of functionalities, R2R DAP (I still haven’t laid my hands on it because of its price). The RS6 started the premium R2R-based Darwin Architecture for portable digital audio players for the brand. And recently Hiby launched the RS2 which got my attention immediately since it had an affordable price level while bringing the goodness of R2R DACs with modern functions like adjustable FIR filter, Harmonic controller, NOS/OS, etc. It is a pure audio player with the HiBy OS...

In the portable music world, Cayin is well known brand that offers product range from the budget N3 Pro up to the flagship N8 with the N6ii sitting in the middle. Now Cayin offered portable R2R dac/amp at affordable price that, according to me, will win many fans. For me it is a bit a game-changer since the price you pay for getting into the R2R replay is peanuts. Cayin took a bold step and built the RU6 with thin-film resistors with 0.1% precision and a 25ppm temperature coefficient and brought the price tag inline with some leading MQA dongles...

SPECIFICATIONS: Camphor Eikon / ZMF Eikon Solid Pads Lambskin / Impedance: 300 Ohms / Driver: Biocellulose / Weight: 500g ±20g / Sensitivity: ~98dB/mW / ZMF Stock Braided Cable 3.5 mm Disclaimers: 1/ All shared impressions, findings and facts are relevant to the single headphone sets, not to batches; 2/ All headphones are bought by me and I am getting no beneficials and incentives for my statements; 3/ Yes, most of the impressions are subjective and if anyone decides to take decision, I advise that he should rely on his on impressions also (from...