SBX G6 has indeed better audio hardware and is capable to driving more demanding headphones than SB X3.
Which for one thing has officially 3Vrms max output, likely because of simpler power supply with only negative rail generation and no positive rail boosting.
(USB's 5V doesn't leave room for much else than 3Vrms)
But unfortunately SBX G6 has only old fixed HRTF algorithm.
Really sad how slowly Creative has been bringing head shape customizable Super X-Fi HRTF into sound cards, while gaming would be the way biggest benefiter from it:
We hear in 3D with two ears, because shape of the head (+pinnae) causes direction dependant changes to signal received from sound source by both ears.
Hence details of those binaural cues obviously depend on listener's head shape.
So some average head shape based HRTF is more or less compromise for most people.
And HRTF better for one person is worser than another HRTF for second listener and vice versa.
Customizable HRTF helps to that.
(but also makes recordings less usefull for comparison because of possibly entirely wrong tuning of HRTF)
If even remotely same amount of effort would have been used to improve gaming audio as graphics, we would have had customizable HRTFs in start of the decade.
Thanks. The G6 seems to get a lot of poor reviews (on Amazon) saying that it’s buggy and unreliable - which puts me off a bit!
I guess the other contender would be the GSX1000 but it’s almost twice the price and in the YouTube videos I’ve found the positional audio is not as good as SBX (particularly for sounds behind your head).
Problem is unreliability of those user reviews.
Thinking ability of average consumer is falling to such level that lots of them would no doubt give bad reviews to pencil, because they couldn't figure out how to sharpen it...
Though likely some of toyphone generation would already fall on their face in trying to find correct end of it!
For my head HRTF of GSX is pretty good and not falling that much behind Creative's old fixed HRTF.
But of course for your head shape it could be worser.
And rest of it can be defined as heavily overpriced audiofoolery brand hype scam:
Because it doesn't have any good DAC and neither it has any real headphone amplifier.
It uses cheap Conexant CX20745 meant for cheap phones and tablets:
https://www.head-fi.org/threads/sennheiser-gsx-1000-1200-impressions.824923/page-30#post-13504383
http://dtsheet.com/doc/1214288/conexant-cx20745
https://prom-electric.ru/media/CX20745_ds.pdf
That's struggling to match 30-40€/£ Audigy Fx/Xonar DGX budget sound card DAC.
And of course you don't expect cheap phone/tablet to have any headphone amplifier.
Page 10 of datasheet says 1Vrms as max headphone output.
Which Sennheiser now seems to have updated into their "fact sheet".