Isolation is solid on these but don't expect it to isolate like a fully sealed IEM. While the ER4 isolates -43db, the GR07 isolates about 24-28db in my experience.
[setup: Deep Fit>Phonak Single Flange tips or Sony Hybrid tips in small>iPhone6
bass: This is where the difference between the Classic Edition and Bass Edition lies. When I first heard Vsonic were releasing a "Bass Edition" of the GR07, I wasn't all that interested. I found the bass balance to be adequate and was expecting them to boost the bass to levels to where the midrange will affected as it's usually the case. What actually occurred, was a very subtle boost in the subbass, midbass stays about the same. The boost is gradual from about 80hz all the way down [graph shown below]. I always found the GR07 to lack a bit of subbass, this Bass Edition remedies that and tastefully so. Upon comparing the two, I now understand the 30$ difference between the two. The Bass Edition is simply the definitive edition of the GR07. That's not to say, there's a huge difference, get to the other regions and the two editions are identical and as mentioned, the subbass boost is small. Those who want to experience the sound of the GR07 for the lowest price possible, opt for the Classic Edition, those wanting the best the GR07 can offer, should spend a little more for the Bass Edition.
midrange: Midrange is nice and detailed here with a small hint of warmth. It is well represented and a little laid back. I'll say for the most part, these regions are done tastefully so. Midrange is neither too far back in the mix or too forward.
treble: Here lies my main criticism of the GR07. Get to 6k and there's an apparent spike, insert the IEM too shallow another spike is at 8.5k. I was able to tame the 8.5k spike with a deep fit, but the 6k spike remains apparent despite of this, though also tamed a bit. The treble is bit grainy as it kind of dips between it's spikes. Treble extension is good, but could use a wee bit more air. Despite the spikes, the treble isn't that offensive with a deep fit, it's apparent, but never becomes really abrasive whereas an IEM like the Sony MDR-EX1000 can be. The treble does carry good presence and maintains the relatively flat response quite well for the most part.
The GR07CE/BE aren't necessarily spacious, they have a more laid back, subtle sound, with only some soundstage width. The driver is fast and does image instruments fairly well, but I found it to fall short compared to certain BA IEMs. GR07BE has great extension at both ends, though I would have liked a slightly more extended treble, for a more airy sound. Overall, it's timbre is nice, though I found it to lack a bit of definition with higher pitched instruments.
Below comparisons are done with GR07BE.
Ostry KC06 Comparison: The bass edition of the GR07 portrays quite realistic sub-bass, a bit less in quantity compared to a modded KC06, with more realistic sub-bass compared to a stock KC06. The midbass levels are similar, with the GR07BE having a bit more bass control, with the KC06 having a little more warmth, midbass to lower midrange. The 1-2k region sounds a bit more refined on the GR07, overall the higher midrange sound similar between the two, with the GR07BE being a wee bit more refined. Get to the overall treble and the GR07BE has two apparent peaks, one at 6k and another at 8.5k. KC06 has peaks at 8.5 and 10k. I found the GR07BE to be peakier overall, with a deep fit and Sony-Hybrid tips I was able to tame the 8.5k peak but the 6k peak remains quite present. With the Comply S200, KC06's 8.5k peak is tamed and the 10k peak became minor. The KC06 has better treble extension, sounding more airy and open in these high frequencies, though a bit splashier than the GR07's treble despite being less sibilant. Overall, the KC06 simply sounds a bit more refined in the high regions with a smoother, more extended treble. Soundstage depth sounds a bit better on the GR07BE, but the KC06 is wider and more airy. To note, the KC06 also sounds more dynamic, overall it's a more engaging sound while being about just as balanced. On the contrast, there is some finesse on the GR07, the KC06 lacks, it's more subtle but a bit more refined. Hard to pick a winner here, the GR07BE's bass and lower midrange sounds more mature, while the KC06 sounds better in the higher midrange and treble.
Hifiman RE400 Comparison: I couldn't necessarily do a direct comparison here, but I'll just make it subtle based on what I remember of these. The GR07BE has similar bass levels with a more realistic subbass, similar midrange clarity and a more balanced, extended treble albeit more prone to sibilance. Both are meant to have a more studio-monitor sound, but I feel the GR07BE is a tad better in it's role with a bit more balance and bandwidth, extending better at both ends. What I will give the RE400 is a smoother, less fatiguing treble, but it's a bit subdued for my taste. Outside of sound, both are really comfortable, but the GR07's cable feels far more durable.
T-Peos Altone 200 Comparison: Here the Altone gives a more present bass. Problem is, I found the GR07BE more extended and controlled, whereas the Altone has a bigger midbass hump and a sub-bass roll-off. The Altone as a result has a looser more punchy bass, GR07BE has more rumble and control, more subtle but more filled bass. The midrange is warmer on the Altone in the lower mdrange, details here are less apparent. Get to the higher midrange, the Altone is very forward, to the point of being a fault. While this makes certain details more apparent, it simply sounds unnatural and edgy with higher pitched instruments. 3-6k is where the problem lies on the Altone, creating the mentioned effects. Treble is also peaky as well, though with Comply TS400, I was able to tame the peaks here. Both GR07BE and the Altone are mildly sibilant, the difference is that the Altone has this edginess to it's sound that's quite apparent. I was able to make the Altone more balanced with a 15ohm resistor, making them much smoother but, doing this also made the lack of the treble extension more apparent. Simply put, the GR07 sounds a bit airier and open due to better treble extension, though the difference isn't huge by any means. Despite of this, Altone does place instruments a bit better than the GR07. Overall, the Altone comes off as this extravagant IEM, that simply wants attention. It's bass has a lot of punch and it's midrange and treble are detailed, but too forward for it's own good. GR07BE on the other hand, is more laid back, but also more mature, as most of the frequencies are done at about right quantities, despite it's flaws here and there. I'll give the nod to the GR07BE, here proving it can compete and surpass IEMs above it's price.
Dunu DN1000 Comparison:Here the Dunu carries more weight as it's bass it's more filled in the sub-bass. A friend of mine here mentioned that he found the DN1000's bass as slower, I agree to some extent but it's subtle, but can see where he's coming from. The bass of the DN1000 hits harder overall, so it appear to linger more, there's more reverb here. The bass of the GR07BE is a bit more neutral, but I found the DN1000's more subbass oriented bass more euphoric. The midrange of the DN1000 has a bit more warmth and it's also a bit more forward, compared to the more laid back GR07BE. In the treble the DN1000 does have a big peak that extends from 7-10k, so it can be as sibilant as the GR07BE. But these peaks can be tamed a lot more, than the GR07's. This means it's more finicky with tips, but the potential is there. After finding the best tip/insertion depth combination for both, the DN1000 simply sounded more defined in the higher frequencies. Mild sibilance due to it's 10k peak on DN1000, but the GR07BE was more offensive and yet a bit more subdued in certain regions in the high frequencies. Treble extension is better on the Dunu, so it sounds more airy and spacious While some may find the GR07BE's bass balance to be preferred, I found the DN1000 to be more rounded in the midrange and highs, with a more spacious soundstage with better instrument placement. While the GR07BE bested the previous hybrid, I would have to give it to Dunu here, though it is about 55-70$ more expensive. Outside of sound, the GR07 is much more comfortable, with smaller, lighter housings, compared to the bulky and heavy Dunu DN1000.
Here I show how the GR07 Bass and Classic Editions will graph using the latest Olive-Welti in-room compensation. I superimposed InnerFidelity's data for this result and did some averaging in addition to sine sweeps. It is not meant to be 100% accurate. Things change with insertion depth, though all in all I feel this portrays the overall tonality quite well. I found this data useful for EQing as well, though the 10 peak is lowered to 8.5k with a more shallow fit based on tone sweeps I did for these.
I would like to thank user UnityisPower for loaning me the GR07 BE!!
Vsonic Company Tour [must be translated]
InnerFidelity Graph for Bass Edition
InnerFidelity Graph for Classic Edition
GR07 MKII analysis by Rin [should apply to current models for the most part]
Vsonic GR07 Head-fi Thread