Stealth Ultimate Ribbon versus Nordost SPM Reference cable. SPM's retail price is around 3000$, 2.nd hand 1.500 USD. Associated equipment, Revell Salon speakers D&B Lab mono pair of custom made tube amps and pre Goldmund CD Player 1-TREBLE UR is dramatically better at treble. Treble is such a clean, silky, detailed. Body of instrutments and soundstage is very obvious with UR. SPM is not such detailed and clean at treble. The differency is certain, no doubt 2-BASS UR carries greater load of bass to speaker. SPM has weakness in the bass, UR has full of bass with lower extension. 3-MIDS That seems to be the weakness of UR's which mids are clearly behind of SPM in terms of volume level (not the quality or naturality) With SPM, mids come to front, vocals, instrutments come to front and clearly defined, but with UR, they go back. STEALTH VARIDIG DIGITAL XLR to CARDAS LIGHTENING DIGITAL Stealth is softer, silky and more natural.