How do you know when to tweak or fix?
Does it make sense to buy a new amplifier when all it might have taken to get better sound was an afternoon working with the system?
I think these are all valid questions.
In the short run, if you’ve exhausted all the avenues of tweaking then clearly it’s time to buy that new piece of gear to enhance the system’s performance.
That said, in my experience, that’s too simplistic an answer because it’s only the rare few who actually take the time to set up their systems properly.
For the majority of folks, they did the best they could with system set up and then called it good.
The tweaks start from that point.
This is one of the reasons I wrote The Audiophile’s Guide, The Stereo.
Using a systematic approach to proper set up goes a long way toward achieving sonic nirvana.
Of course, if you’ve gotten all you can out of your system, time to step up to the plate and get that new kit!