I had the pleasure of auditioning the GT3 twice, over the two days of Canjam in Singapore. Here are some brief impressions:
1. A deep and secure seal is paramount. Otherwise, because of the sheer speed of the drivers and the amount of details it pumps out, a poor seal would result in a thin and "fizzy" sound. I found the best seal with complys and spiral dots.
2. The GT3 is neutral and bright sounding with a slight bias towards treble (regardless of the filters used). Bass is incredibly tight and fast, so its not really for those looking for a visceral rumble. Mids are open and resolving but definitely on the thin side. Lovers of lush and liquid vocals need not apply. Treble quantity is in abundance but could sound metallic and brittle without a good seal. With the treble filter and spiral dots, treble gained a bit more body and is more articulated (I believe the small indentations in the Spiral dots tips are at work here, controlling resonance that would otherwise make the treble sounds splashy).
3. Soundstage is wide but not deep, so the whole band is lined up in a row. But because of a very clean and dark background, fast and layered music didn't sound congested.
4. I would recommend these for those who enjoy classical music, acoustic guitars and string instruments in general. It also sounded great with electronic music. I am hesitant to recommend these for heavy metal (which was the main genre I tested the GT3 on), ironically, because of how fast these are. So in a track such as this:
Treble can get too hot and because of the relatively 'flat' stage, different instruments might get compressed.
5. The built quality is superb. Very well-machined chassis with good strain reliefs.
I would love to spend more time with these because I think they have the potential to be something special. I don't think I have heard anything quite as fast. Pairing these with a copper cable might give it the body it needs. Oh yes, I was running them off the iFi Audio Nano iDSD Black Label from my Galaxy S8+.
So, there you go, some thoughts on the GT3.
Thanks to Joe from Advanced who kindly shared his thoughts about what Advanced wanted to achieve with the GT3 and for patiently letting me sit through 2 audition sessions!