Pros: Great value for money, comfortable, compact
Cons: average soundstage, with some tracks it lacking bass
The Rhapsodio RDB+ 2v1 (formerly known as RDP+ v2) is the baby brother of the RDB+ v1. It's still a 2xBA & 1xDD but instead of a 10mm driver that the older brother has, it sports an 8mm driver instead. As such the overall shell of the RDB+ 2v1 is smaller. In addition, the sound of the RDB+ 2v1 isn't necessarily a successor of the RDB+ v1. Talking to the makers, the RDB+ 2v1 is meant to have a more accurate sound signature, a goal of which I feel they have achieved.
Design & Ergonomics
As can be seen, this isn't a very big IEM. Used with Ortofon tips, it fits snugly and comfortably in my ears and don't protrude out that much. Despite movement from walking or head motion, the IEM sits in place in the ear. Unlike the RDB+ v1, the bass port is placed next to the cable socket instead. At least for my ears, the port doesn't get blocked. However the IEM is prone to wind noise especially in a wind tunnel situation (subway exits, etc.). On normal days though, isolation is decent. I can hear external ambient noise however are easily ignored and not distracting when music starts playing.
The construction material is the same as other IEMs and seem durable although it seems more recently it's been revised with an even more robust shell. Note also the goove in the nozzle seems to hold the tips reasonably well. Having said that, My Ortofon tip has fallen off twice early on but haven't fallen out recently.
The RDB+ 2v1 is an easy-to-drive IEM which is easily driven by an iPhone or other mobile device. It doesn't require an external amp, however one still can be used to suit the listener's signature preferences. Although not particularly sensitive to hiss, it is sensitive to poorly mastered recordings however not necessarily sensitive especially with live recordings. However, I've not encountered any issues with poorly ripped tracks.
Tests were all done with the Ortofon tips. Overall, as mentioned in the introduction, I find these IEMs to fulfill it's designers' objectives. The signature is almost somewhat neutral. I'd venture to say that, as per the maker, mostly accurate too. The reason why I mentioned mostly is that occasionally, I find the upper bass/lower mids to be just a tad lacking but not by much. Usually the other positive features of the signature distracts from noticing that lacking point.
I never realised until recently that I'm particularly sensitive to bright trebles. This is coming from someone who used to enjoy the Edition 8's and owned one for 9 months! As such with the RDB+ 2v1, I find the trebles to be sitting on the fence really depending on how the wind blows. Given the right conditions (cable, amp, DAC), it has a very airy and smooth presentation - one of the highlights of the IEM in fact. However with a bright amp + pure silver cables + bright musical tracks, then the trebles could sound harsh. However I don't actually encounter that latter combination that much which means most of the time I'm actually enjoying the airy trebles quite a bit. I also suspect that the mids have a big part at play to the relative perception of the trebles (which is why I may not find the trebles sibilant most of the time).
To my ears the mids are also quite flat except for the lower end where I personally feel it takes a little bit of a dip but not by much. In fact due to the rest of the frequency and the airy trebles, I actually don't notice it most of the time. Vocals sound detailed yet rich and musical. In fact vocal tracks seem to shine with this IEM's signature. Listening to the Norah Jones' Come Away With Me album, there's a lush richness in her voice with an intimate presentation. Listening to Taylor Swift's "Ours" and vocals are great whilst guitars to be quite crystal clear. Similarly with A1's When I'm Missing You, the vocals & guitar at the introduction is quite musical. With Adele's 21 album (possibly more particularly to the "Set Fire To The Rain" track, I personally could do with a little more upper bass/lower mids emphasis. However it's ever so slight that the other positive features of the signature seem to distract me from noticing this little dip.
The bass is an area where I think most listeners will perceive this IEM to be lacking. However what I find rather interesting about the bass is that most of the times when it's truly called for it's there, but's just not forwardly present all the time. Back to the Taylor Swift's track, the bass there fills nicely without being overpowering. However with the A1 track, although the bass is tight, the sub-bass does feel somewhat lacking, therefore lacking the fun-factor too.
Soundstage and Imaging
The soundstage is decent. These days with the likes of FitEar MH335DW or Tralucent 1Plus2 with their supermassive soundstage, the average IEM's pale by comparison. Having said that, it doesn't sound congested by my standards at least. But not exactly super vast either. I feel it performs well amongst its peers. The imaging on the other hand is another forte of the RDB+ 2v1. This is more prevalent with album's such as "This is Chris Botti" with the live recordings.
Airy Presentation, Timbre, & Speed Response
I'm probably repeating the airy presentation again however this is one of the great features in addition to timbre that stick to my mind. String instruments such as violins or acoustic guitars, and percussions just sound so natural with this IEM. I feel they are presented crystal clear and accurate. The response of the IEM also sounds quite fast. Listening to Cher Lloyd's Sticks + Stones album, the tracks don't sound slow at all and keep up pretty well.
Overall to my ears, these IEMs are as what the maker has told me - accurate. To me they also sound mostly neutral of which I'd love to compare them to the UERM one day. They don't have a warm signature, nor are these bassy or hi-fi fun sounding IEMs and if a prospective buyer is looking for those kinds of signature, I'd have to politely recommend looking elsewhere. However if one is looking for a mostly neutral IEM, to my ears they're closer towards being the "monitor" styled signatures - at least tonally. Finally but not least for the price I paid, they are extremely great value for money.