Short term RAAL SR1a impressions
Introduction
I have listened to the SR1a for the first time in the summer and I was impressed by some of their special traits.
While I preferred the AB-1266 Phi TC overall experience and (relative) versatility, I was captivated by the SR1a transparency, detail retrieval and realistic vocal presentation.
So, after getting some encouraging feedback (including
this review) that my amp – the Riviera AIC-10, which I actually selected to max out my TC experience, after a multiple-months auditioning campaign
– could get them to work fine despite its severely undersized 10W nominal output rating, I decided to take the plunge and bought a pair from a fellow head-fier.
The following is my
initial review after about 50 hours of listening.
Build and finish
The SR1a looks and feels more like a decently polished prototype rather than a luxury piece of equipment.
Apart from subjective aspects – e.g. aesthetics – the design, construction, material selection etc. appear to come directly from the form-follows-function philosophy with limited to no concessions to perceived quality aspects.
Comfort
One of the strong points due to the lack of constriction around your ears. Adjusting of the leather band length is crucial to get the comfort right, so that the soft side pads do not push on your temples.
Weight is not an issue to me (especially coming from the AB-1266) and I could wear the SR1a for multi-hours listening sessions, up to 6 hours straight with no problems.
Actually, thanks to the lack of direct contact with the pads and the limited air pressure directly hitting my eardrums, reduced physical listening fatigue is one of the best features of the SR1a.
Timbre and tonal balance
The SR1a has a neutral, slightly tilted to cold, tonal balance to my ears.
In this respect, it is not dissimilar to my AB-1266 Phi TC, however, due to a generally very fast response with quick attack and decay of notes, and to a less present bass / sub-bass, the SR1a sounds leaner to me.
Given that the SR1a responds very well to EQ (more details in the following), this slight coldness can be adjusted to the listener’s preference to some extent.
I listened to the SR1a with my AIC-10 (hybrid), the Chord Etude and Thrax Enyo (tube), and I would say that my Mullard NOS equipped AIC-10 sits in between the Etude and the Enyo with a warm-ish yet very transparent tonality, that suits the SR1a character very well in my opinion and to my tastes.
Soundstage and Imaging
The soundstage size is vast and fairly deep, in headphone terms, and can be tailored by adjusting the earpieces (more about this in the following).
Ambience is captured well. Conditions where the contribution to ambience reconstruction are related to rumble or deep bass atmospherics effects are much more enjoyable with the AB-1266, and sound drier with the SR1a. More generally, I find it easier with the Abyss TC to be drawn into the recording venue character (studio, church, concert hall, jazz club, live ...), being very clear examples The Trinity Session from Cowboy Junkies and Live in Cook County Jail from B.B. King.
Although the open, reflection-free design of the SR1a provides a unique presentation, I would still place the SR1a firmly within the (best) headphone experience. Reports where the SR1a are compared to speakers (even in near field configuration) are a bit exaggerated in my opinion, as the sound comes mostly from around your head, as usual.
By widely opening (45° or more) the pads, the nearfield loudspeaker setup mimicking effect is increased, but the imaging is less clear and the soundstage lateralization is emphasized, with a loss of cohesion.
Imaging is as pinpointed as it gets, provided you don’t overcome the pads opening sweet spot. Layering is very good as well.
Clarity, transparency, resolution and detail retrieval
Off the chart performance here, simply the best I have heard from any type of transducer. The Abyss TC can even sound muffled in direct comparison.
Readability of intricate musical passages is extremely insightful, non-musical background effects (hiss, noise, audience / musicians cough, breathing, etc.) are apparent, even beyond realism.
Very fast piano pieces are incredibly clean, and you can hear every single note almost like a staccato, without ringing or blurring of the notes. It is a deep dive into the score that goes, again, far beyond a realistic listening session. It’s exciting, but I believe I like the AB-1266 reproduces the harmonically complex, resonant nature and full bodied character of a concert piano live performance better.
Solo instruments like a violin, or a sax just pop out of a pitch-black background with the right recordings, adding up to realism and you-are-there perception (example: Ask Me Now, Mc Coy Tyner, Chesky Records).
Situations where the classical "I have heard this track hundreds of times and I never noticed this" moments come out are very common (example: Jazz at the Pawnshop).
Dynamics
Here the limitations of my amplifier do not allow me to provide a thorough and fair feedback.
The AIC-10 can drive the SR1a properly (i.e. in line with what I remember from the Chord Etude I tried last August) at moderate loudness levels – actually most of my typical listening is done at 75-80dB – and when the type of music, recording level and sub-bass content allows.
Notably, I had gross bass distortion problems with organ, hip-hop (honestly, I use some hip-hop tracks only when testing equipment, as I don’t listen to this genre normally) and clipping with quietly recorded classical pieces in extreme dynamics passages like tympany attack, or full-blown choruses.
However, with baroque, piano, jazz, singer/songwriter, progressive rock no artifacts or hardening occurred which I could relate to amp struggling. Most of my listening is done with the knob under h13.
All this said, dynamics is generally good, but not great. Response is softer than with the Abyss, and I miss the sheer scale and the physical impact of the air hitting my skull and ears that the AB-1266 can produce, even at modest listening volume.
Apart from lack of power / current from my amp, I believe a limitation on visceral impact of the SR1a is produced by its open design as opposed to the traditional sealing pads, because I had the same feeling when I tried the RAAL with the Etude and Enyo.
Bass
Being addicted to the mighty AB-1266, I was expecting a severe disappointment here.
Actually, the overall bass performance from the SR1a is better than I thought, quantitatively in line to what I remember from the HD800S. All goes quite fine until 100Hz, then some roll-off starts mildly and a drastic drop occurs on the last octave.
Bass quality is excellent – within the caveat above – especially in terms of speed, texture and articulation.
After applying some EQ, I got closer to the amount of bass quantity I was looking for, together with a moderate, but welcome, increase of overall perceived warmth.
About bass slam in general, and that missing last octave, here is where the power limitations of my AIC-10 kick in, so I would rather avoid over-commenting about the sub-bass capabilities of the SR1a by themselves.
Of course, in my present set-up and for my mild basshead tendencies, the Abyss TC outperforms the SR1a by far in terms of bass satisfaction. To be honest, the endorphin shot from the sub-bass kicking-in in albums like the ones below, that the TC are able to deliver is – I believe – not possible to achieve within the SR1a design envelope (driver response, pad-less earpieces).
Midrange
The SR1a midrange is very close to my subjective perception of neutral. Using vocals as a midrange benchmark, I have got the most realistic vocals presentation heard to date from a headphone.
The LCD-4 provided richer, more seductive and euphonic female vocals, while SR1a provides realism through a striking clarity, texturing, body, while retaining a cooler timbre. Again, a similar signature compared to the TC.
An outstanding feature of the SR1a is how well the vocals are separated by the rest of the music, whereas with the TC they are a bit recessed and blended / blurred in direct comparison.
Same Girl album, from Korean singer Youn Sun Nah has provided immense pleasure to my ears via the RAAL.
The same stands for stringed instruments. Listening to the late Beethoven string quartets with the SR1a has been one of those goosebumps moments.
Treble
Treble is very well refined and liquid, and has an extension which, I guess, easily surpasses my (15kHz limited) hearing capabilities without roll-off. Cymbals, triangles sound spookily real, well placed and with the right size.
Being sensitive to sibilance and treble peaks around 7-8kHz in general, I was happy to find that the SR1a, while being on the bright side, are not too aggressive to my ears.
Sibilance from the SR1a is better than what I was afraid of, and after a bit of EQ correction at around 7.5kHz, I am getting a smooth, non-fatiguing response without sacrificing transparency and the sense of air too much.
Response to EQ
My experience with EQ has not been great in the past, as I always ended up doing more harm than good, especially in terms of reduction of transparency.
With the SR1a, I was happy to find that they are able to take some EQ with very limited drawbacks, and I am now using them with a +4dB bass increase (low shelf) from 80Hz, a small dip around 1800Hz and a -4dB, Q=1.5 dip at 7500Hz.
With this set-up, the overall listening experience is extremely polished and well balanced (still a bit bass-light for my tastes), and listening fatigue drops to nearly non-existent levels.
Effect of pad opening and headband adjustment
As an AB-1266 owner, I am used to adjusting the headphone structure to fine tune the sound presentation, and the SR1a allow a similar possibility, by changing the opening angle of the pads and the headband length.
A larger pad angle provides soundstage widening and a softer, more diffused sound, while placing the pads more parallel (and, by doing so, closer) to your ears increases gain, imaging focus and intimacy.
My preferred set-up, at this point (i.e. after about 50 hours of listening time only) is with an approximated 30° opening for most situations.
Furthermore, moving the pads forward / backwards (by changing the placement of the headband on my head) and especially upwards / downwards (by changing the length of the headband) made a difference, as it changes the coverage of my ears by the ribbon driver area.
For my small head, the best setting was the shortest headband (see below) , where the drivers are nicely overlapping my ears. This improved soundstage depth and imaging stability.
All in all, the SR1a is very much worth experimenting with the fit and needs a bit of time and patience to be tailored for best performance, no different than AB-1266 also to this respect.
Preliminary Conclusion and Next Steps
I am really enjoying my time with the SR1a so far, while still being in the process of re-discovering my library in order to identify the portion of it that the SR1a, driven by the AIC-10, can render in the most satisfying fashion.
My next steps are to continue this very enjoyable rediscovery process, possibly leaving the critical listening approach I have kept in these first couple of weeks, and allowing myself to relax more and get lost in the music.
Afterwards, I will begin to come back to the Abyss TC for some more direct back-to-back comparisons, which will ultimately lead me to a criterion for balancing my listening between these two great headphones depending on mood, musical programme etc..
Fun time ahead