How important is the tonearm?

Yes, it is all important. The table, the arm, the cart, the wiring, etc. However, the OPs question was not "what is more important". He simply asked "how important is the tonearm". If they asked "How important is the table?" My answer would be the same. Very important. No component can correct the faults of another, but faults can be masked by another component.

However, the OPs question was not "what is more important". He simply asked "how important is the tonearm"

You aren't a real Audiophile. Sorry, but your logical following of "read-think-answering" is opposite to forums advices.

the basic yardstick for successful purchase is listening fatigue. In order of importance

1) turntable
2) tonearm
3) cartridge

however cartridges like speakers illicit love/hate/ho-hum responses. And unlike tonearms stylii can be destroyed in a blink of an eye. So find a cartridge manufacturer whose sound you love and settle on the model that won't cause divorce if your spouse dusts the stylus; invest any difference in your tonearm. (which may still cause divorce if your increased blissful listening hours makes your spouse feel like an "audiophile widow" :<)

You aren't a real Audiophile.

And proud of it! :-)

01-27-11: Dan_ed
The job of the tonearm is to hold the cartridge in the groove with the grip and determination of The Incredible Hulk while maintaining the finesse of Tinkerbell.

could you explain what characteristic would allow one tonearm to inherently "hold the cartridge" better than another tonearm? i would prefer an answer with specificity over a generalized "it is widely known" type of response. i ask this because as long as the tonearm is rigid (and all tonearms of which i am aware has this characteristic) then i am having difficulty understanding what the difference really is.

what does seem to me to be of importance is the effective mass of the tonearm, but the signiificance of this must be evaluated based on the compliance of the cartridge that is to be mounted on the tonearm. here, i can see a consideration that has importance. but this is a matter of effective mass and not of the specific brand of tonearm. the reason why you care about the effective mass is because the compliance of the cartridge is a measure of the spring properties of the cartridge. when the effective mass of the tonearm is not properly matched with the compliance of the cartridge you can get resonances at low frequencies that can make the cartridge become unstable in the groove. but this analysis would suggest that what you really care about in a "good arm" is one whose effective mass is appropriate for the compliance of the cartridge. so the real question that i am referring to in my earlier comments is, what other characteristics about the tonearm have concrete significance? it is hard for me to grasp assertions that a $10,000 tonearm is better than a $100 tonearm simply because the former costs 100 times more than the latter.