I analyzed IT07 paired up with MAX and LPGT while playing a variety of test tracks, such as Agnes Obel “The curse”, Sandro Cavazza “So much better” (Avicii remix), C-Bool “Never go away”, Ed Sheeran “Shape of you”, Alan Walker “Darkside”, Galantis “Hunter”, Iggy Azalea “Black widow”, Indila “Boite en argent”, Dua Lipa “Love again”, Counting Crows “Big yellow taxi”, David Elias “Vision of her”, and Michael Jackson “Dirty Diana”. Due to a hybrid design, a more critical sound analysis started after about 100 hours of standalone continuous playback, and I used stock silver cable and stock whirlwind eartips along with silver filter.
As it was already mentioned, IT07 comes with 3 sets of replaceable mesh guard screens like in other iBasso IEMs. From a default Silver (the most open mesh) to Black (medium opening) the change is more subtle where I hear a bit narrower soundstage with a deeper sub-bass and vocals being a bit denser and slightly pushed back. Going to Gold (least open mesh) from Silver was more noticeable with sub-bass going up and getting thicker and mids/vocals going down and being less focused. Basically, going from Silver to Gold the signature changed from more W-shaped to more L-shaped. For my sound analysis, and personal preference, I was using Silver filter.
Upon closer listening, I hear a very wide soundstage with a natural depth/height. Not exactly holographic, but naturally expanded with a decent imaging and separation of sounds in space. Tonality is rather natural, yet still quite detailed with a relatively accurate timbre of instruments and vocals. The signature is balanced and distinctly W-shaped due to a good extension and impact of low end, detailed natural tonality of mids, and clear, natural, extended treble with just enough crunch to give the sound a good definition. The retrieval of details is pretty good, not exactly on analytical level, but I hear a very good level of clarity.
Regarding the coherency of this hybrid 7 driver IEM, I was going back and forth with my assessment. The W-shaped sound sig of IT07 has a distinct focus on lows, mids, and treble, especially lows/bass. They all work together very nicely, but they don’t necessary blend in together in a unison of a single driver like you would hear it in IT04. I think this is due to the bass standing out on its own in IT07 tuning. Often in hybrids you have a cut in lower mids for a better separation between DD lows and BA mids, but not in IT07. Here, the bass impact is elevated but without overpowering the mix. And the same with treble, it blends in naturally, yet you can still shift your focus to its organic sparkle which stands out on its own. Thus, while I’m not saying IT07 has a coherent unison tuning that blends all drivers together in one, I would rather call it a W-shaped tuning that creates a coherent balance between lows, mids, and highs.
Looking further into sound details, low end really stands out in this tuning. This is not a basshead IEM and the bass is not overwhelming or overpowering, but it is one of the first things I noticed, especially after listening to IT04 prior to switching to IT07. Bass extends and goes down pretty low, down to sub-bass rumble that tickles your ears. And it is not just the extension but also the lift in sub-bass, not overwhelming but something you can clearly hear and feel. For a dynamic driver, the punch of mid-bass is articulate and slightly rounded with an average attack and decay that gives it a better control. You can clearly hear the authority and the speed of DD driver, and will not mistake it for BA.
Mids are natural, detailed, and with plenty of clarity. Lower mids are not too thick or too thin, definitely have a fuller body but it is average thickness, just enough to give the sound its organic tonality. Upper mids are natural and detailed with a focus around 2kHz and 4kHz peaks that give the sound its clarity and definition. All the sounds are well separated and layered, and as expected for this type of natural tuning there is not too much air between the layers. Treble is well extended, non-harsh at all. There is a moderate amount of crunch but it is well controlled and quite natural.
The selection of eartips is crucial with any universal in-ear monitor and will affect the sound, especially the bass impact depending on the seal and the soundstage depending on insertion depth. Due to a large opening of my earcanals, I usually go for the largest size eartips to get a better seal. Please, keep in mind, these impressions are subjective and relative to my ear anatomy which affects how I hear the sound.
Stock foam tips – even though I was use large size pair of these eartips, I think the seal wasn’t as tight, thus bass was less elevated and mids were more forward, including a little more air in treble. It actually works out as a good alternative to those who prefer less bass.
Stock narrow bore silicone tips – these give IT07 a perfect W-shaped sig with emphasis on deeper lows, a little more forward natural details mids, and airy, crunchy, extended yet still natural treble.
Stock wide bore silicone tips – these eartips bring out more bass and make mids/vocals and treble sound smoother.
Stock turbo whirlwind wide bore silicone tips – similar to wide bore stock silicone tips, but with more details in mids/vocals and treble.
Type-E eartips – these change the tuning to a more extreme V-shaped, especially with more piercing treble. Didn’t like this pair up at all.
Symbio F eartips – excellent balanced W-shaped sound sig where in addition to deep and powerful bass impact and clear and detailed mids, treble also has a little more sparkle and air without being harsh. As a result of treble improvement, the sound has a little more resolution and even better layering.
AZLA Xelastec eartips – these eartips help with additional sub-bass rumble, going even deeper than any other eartips. Sound sig is still W-shaped and balanced, with a powerful bass impact, natural mids/vocals, and well controlled natural detailed treble.
I liked stock Whirlwinds, Symbio F, and Xelastec tips in pair up with IT07.