Phantom Gold lacks real bass until you know this.

[Duggo]

I purchased a Phantom Gold for "real" bass.   I was underwhelmed but really taken by its clarity.   Little did I know (being a novice) that there was a little secret lurking in the Spark app which nobody seems to have mentioned.   At the bottom of the screen there is a speaker symbol and on the other side is what looks like a Moon.   When you press this Moon hey presto the bass starts.