Both are the same amps (us4+) now except being different on the volume control. Mar 31, 2018niimbus ultimate series us4/us4+/us5/us5 pro headphone amps - by lake people home forums equipment forums Aug 16, 2018having said all that - the niimbus us4+ absolutely belongs in this field of excellent amps.
Mar 31, 2018the us4/us4+ sounds similar to v280/v281 but with a bigger soundstage, better imaging, and more details of bass. The music seems to be integrated on us4/us4+ instead of. Aug 16, 2018at the moment, niimbus is comprised of just two upcoming products - the us4 headphone amplifier, and the us4+.
Mar 31, 2018the treble in the us5 pro is better than in my previous us4, but the advantages end there, the midrange lacks the resolution, separation and air that i had on the us4, the soundstage. Mar 31, 2018as soon as niimbus us4 amps show up in shops again, i will purchase one. Mar 31, 2018one niimbus us4+ is available on the secondary market.
Aug 16, 2018i received my us4+ yesterday and the manual (which is in german) is for the us4 and not the us4+. While i wait for the english version of the us4+ manual, can you please tell me if there.
