Cartridge ISOLATION; What Say You?

Oh the days… I used to cath live Jazz, no amplifiers at a fantastic bar in Charleston - High Cotton

… oh the days, and nights

@tomic601 , I believe I said TOP was not to be used as a standard. No large venue system can be used as a standard. You have no reference.
Acoustic instruments are tops, Jazz is great. Bands with individually amplified instruments can also be used. The Dave Holland Band is a great example. Everyone is amplified except the drums. They use the same set up recording that they use on stage. I've seen them three times and their records sound exactly like they do live. Dave's bass has a lot of character and he takes frequent solos. Great for evaluating bass performance down to 40 Hz or so. 
In Boston we have the Regatta Bar and Skuller's, smaller venue bars seat maybe 100 people at the most. 
Don't forget classical music either. String quartets are great for evaluating imaging. 

@lewm , I think you may be on to something. 

string quartet in the mastering room….what an idea….

w both high speed tape and a really good ADC ( Wadia 17 ), imagine that….

We all craft our own references…

Yes, i should have said anyone vs. you.

What Dave Holland do you suggest ?

I have yet to hear a Dave Holland recording of reference quality, at least for me, anyway...