I only used this sparingly, and it was mainly because the filters change the upper end rather than the lower end. I am not able to provide an explanation of what that means to the average consumer, but I suppose it looks cool on product literature. I can't talk about the sound without mentioning the swappable, color-coded tuning filters. The shape also fits very well in my ear and it is shaped like Shure or Westone IEMs. It certainly challenges the DN-2000 and perhaps even betters it in this regard. The soundstage seems much more expansive than the T10, which is nice. I just have average ears that like to listen to slightly above average music and so don't consider myself an 'audiophile' by any stretch. Vedder’s voice is good with the T20 – nice timbre and tonality. Sure it's bass goes deeper and harder but that alone is the kiss of death for many an audiophile, similarly I love it's relaxed take but for many this would be seen as a knock against the IEM versus a virtue. Bravo on the improvements so far though. Pretty good in this department with the reference filters imo. You can nudge things about by using the filters that they come with but I’m sure you’ll play with them for the first day. Really nice and well taken! So instead of changing the bass (which actually remains pretty constant throughout), they raise or lower the mid-range and lower treble (see graph). Just realised FR looks really similar to MH755. RHA have responded with a pretty well tuned IEM, and I think a lot of people will like these. For this review, I've used my own gear as the music source, and considering that an IEM would be mainly used as a portable or semi portable solution, my source setup has been the FiiO X3 (1st Gen.) connected to the FiiO E12A through line out using the FiiO L16 interconnect. They have a rubber washer to ensure a secure fit. I compared the T20 side by side with some of the other IEMs I have in similar price brackets. Quick first song comparison between T10 and T20. The treble sounds excellent with the treble filter, it really showcases the ability of the T20. A full list of the gear I have owned (past and present is listed in my Head-Fi profile). Your review is the first one that rates it very high on isolation - can you elaborate more on how the isolation is? The bass response is boosted, but this doesn’t really affect the clarity. The T20 also does benefit from some tip rolling! For tuning, RHA includes a 3 filter system on the T20 – bass (black), reference (white/silver) and treble (amber/gold). I would recommend them as long as potential owners are aware of their bass output. It captured Loreena’s vocals really well – and the whole performance was intimate but enjoyable. We thank RHA for this opportunity. It’s labelled Reference but it’s still kinda slanted towards the bass over strictly neutral but it feels a very natural balance. However, it is still quite bodied, and as such, is hard to coil up neatly. It is inserted in the ear canal itself and blocks out a lot of environmental noise. The build quality, in one word, is excellent in my opinion. Only recently have a few retailers and even fewer specialist e-tailers opened up here catering to this segment of the headphone and portable audio market, and a few handful brands have been able to gain loyal followings among the audio quality loving music enthusiasts around. When I received them, they had the bass filters in, and I didn't really care for the sound. Metal Injection Moulded (MIM) stainless steel shell. I listen to a lot of blues, jazz, folk music, classic rock, indie and alternative rock. “Only” above average detail retrieval and separation. With the treble filter, it is a little recessed, but not overly so, they are just a little laid back. Mids on the RHA T20 while lush and clear are slightly recessed, giving it its U shaped signature. Both vocals and instruments are all very well balanced. David again organised a tour with the new T20, and my thanks to him (and RHA) for giving me the opportunity to partake in it. There is no remote on the T20, but I’ve heard that RHA are going to come out with a T20i, which is the version of the T20 with a remote and mic. I’ll make these very quick. Treble is rather sparkly with excellent extension, just shy of sibilance with the silicon tips. They aren't as clear and airy as they are on my Rockets, but they are a bit richer-sounding which has its own appeal. The cable jacket is the rubbery type, but it is not coiling at all. In the last couple of weeks I have spent as much time as possible listening to the RHA T20. T20 Wireless housings with DualCoil driver - MMCX 2. Still, I’d prefer if the bass could be tighter and the treble could be more refined to eliminate or at least tone down the splashy treble. Neoprene carry pouch 6. It is very clean and crisp, not warm or tinny at all like the T10. Overtime I came to appreciate the bass a bit more than I expected - it sounds a bit thick which a touch of boominess, but it does give the overall sound more body and richness than what I normally prefer, and I was really enjoying it by the time I had to send them on to the next participant in the tour. First of all I’d like to thank RHA for sending out a unit of the T20 for us to do an Australasian tour. Leatherette zipper pouch. Plethora of Accessories, Robust build, Ergonomic, Bassy, warm sound, good detail, Filters Tuning System, very long cable, nozzle could be angled slightly towards 45 degrees, on the pricier side, mids resolution, overall resolution, bass quality, soundstage, sound tuning filters, build quality, ergonomics, design, some edginess in middle treble, filters don't have much effect on bass quantity (too much bass with "Reference" filters), low y-split, Enjoyable sound with tuning options, superb build quality, high-quality accessories, Tuning options may not suit everybody, cable is too long/not removeable, sound leans more towards the consumer-friendly market rather than audiophiles, The RHA T20: Something for (almost) everybody. I guess electronic and classical music lovers might like this filter more. I went back to the reference filters after trying all three and stuck with these for the remainder of the time I had them. Reasonably extended upper end which falls short of sibilance, but has enough extension to nicely cover cymbals. I thought these were good and I couldn't hear anything seriously wrong with them. This section is very subjective, as it is sighted, the change between IEMs took about 5-10 seconds, and I knew exactly which one I was listening to. Reid Heath Acoustics (RHA) is a Scottish based headphone company. The user guide is a mini multi-lingual booklet and is superbly designed, and informative, including a response graph, and full information on everything you may need to know about the T10i – from cleaning to getting the proper fit. He loves them. I demoe'd the T10 and it was sibilant on my device and a completely different signiture from my 750's. The T20’s detail retrieval is very good on both tracks. Bassheads will love this. YMMV though. Perhaps the best thing I can say about the sound of the T20 is that once my brain burned in, I found myself paying more attention to the music than the IEMs themselves. There are 3 tuning filters, which is one of the selling points. Hi Vaibhav, good review; your preferences on the sound, quite in contrast to mine, probably indicate how important the inclusion of the sound filters is in the whole RHA package, as it can potentially cater to a wider audience than would be possible with a single sound tuning. The joys of reviewing a favorite product have eluded yours truly, until the T20 from RHA (Reid & Heath Acoustics) came along, supplied for review by my good friends at Headphone Zone (headphonezone.in), a specialist headphone and portable audio products retailer. Opening the flap will reveal a graph with all three of the tuning filters and there is a clear plastic window where you can see the T20 along with the tips and filters. This just had the bass behaving a little more for my own tastes, and really did “complete” the T20. Shirt clip. My main full sized headphones at the time of writing are the Beyer T1, Sennheiser HD600, and AKG K553. If anything I quite like the T20’s low bass emphasis over the Delta’s more mid-bass slant. The added detail really helps, especially with both cymbals and also brass. It tells you on the front of the box that it comes with a three year warranty, compared to the one or two that most other competitors offer. Great quality highs and low range, Build quality is exceptional and ergonomic, comes with customisable treble and bass filters. The build and fit of the T20 will be familiar to those who own the T10/ T10i, RHA's previous flagship models, as the build is exactly the same; all the changes have happened internally, barring the one obvious change of color of the over ear hooks which are now black, as opposed to grey / silver on the T10/ T10i. 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