Some first impressions but it's not enough really, we need more info ASAP!
"The HP-2 sits at the top of RBH's performance ladder. It is a traditional, wired headphone for reference-grade sound. The HP-2 is a completely different design—not just a wired version of the HP-1B. The HP-2 features a pair of 45mm beryllium coated drivers. The frequency range, as you’d expect from drivers featuring Beryllium is off the charts, coming in at 10Hz on the low end and topping out at 45kHz. The sensitivity of the HP-2 is 98bB, making these reference-grade cans and easily load for smart phone or mobile amplifiers.
Specs aside, there’s one very practical thing that makes reference-grade headphones a pain to reach for on a daily basis: their weight. Yes, many reference-style headphones are heavy. That weight makes wearing them all day or for extended listening sessions a bit fatiguing.
RBH knew that a headphone’s weight and feel was an issue so they chose to tackle it heads-on in their design. Boy did they succeed! The HP-2 weighs a ridiculously light 8.82oz. To emphasize the point, the company refers to them as ultralight. "
"So how much do these headphones cost? Well, the price-point of these headphones is something to take serious note of. The HP-1B and HP-2 will both come to market for just under $200. Gene DellaSala had a chance to get hands-on with these headphones and noted that the sound from the HP-1B and HP-2s was better than headphones he’s auditioned costing multiples of the pricing we’ll see with these new RBH headphones. That’s exciting.
Over the years, RBH has gradually expanded its product line, surprising us with each turn. That being said, we’re not just looking forward to an extended review, we’re anxious to get them in-house for some extended listening."
source: http://www.audioholics.com/headphone-reviews/rbh-sound-hp-1b-wireless-and-hp-2-reference-headphones-preview