Phono stage and cartridge


Hello FriendsI'm hoping some one can give me advice, I live on the far south coast of Australia, there is no Hi FI, shops, down here, the closet is 4 hours drive to Sydney, the biggest city in Australia!My audio gear is:1. Onnce Analog TT,  made here in Aust
2.."the wand Arm " made in New Zealand, with a Zu/Denon 103, cartridge
3 .Phono stage, is PS Audio GPH4. Pre amp is PS Audio, stellar Pre/Dac5. Pair of audiolabs, mono blocks 2500 WPC
5 Zu Audio Soul MK 11 speakers!!Most of my  recordings, sould great, but there are a lot. that has good bass, but a harsh, sound overall!!I put this down to The Zu Cartridge, or the PS phono stage??I have never consider, the use of a "sub", as i don't no, how this worrks??Can you friends, give me a "heads up" ??.1. New cartridge??, yore input??
2. Different phono stage(I like a strong balls in the Bass)?3. Subs? I have no experience, with these, where do I place these??
Many thanks, any input would be appreciate !!
Regards
daveyonthecoast
Recordings whether CD's, downloads, LP's and streaming vary widely in sound quality! Some good, some not so good, some bad - and a few GREAT! This is REALITY! And it has ALWAYS been so! There exists no "magic ring" - or component - that will transform poor recordings to great!
I have been in this hobby for 40+ years and am always on the lookout for better recordings. Focus your search this way rather than on the "flavor of the month" component! Your present system is fine enough as is and quite revealing of recording SQ! No need to be neurotic and worrying about changing components! Just buy better recordings! 
 No need to be neurotic and worrying about changing components!


Room treatments are often the last to be considered but one 
addition that can make the most substantial benefit.

Without them I liken it to chasing ones tail.
Tend to basics mate. Is you phono cartridge aligned properly? Is your tracking to light or too heavy? Is everything "tight" on your rig (screws that attach cart to tonearm, anything loose that shouldn't be)? Do you use any isolation under your turntable (got to keep things from vibrating)? Do you use a power conditioner? Are your interconnects shielded (important if you are near industry or military)?

A stated above, it's important to have reference recordings that will tell you when your system is misbehaving.

Finally, Although often ridiculed, the accessories in this hobby usually serve some purpose.