Turning amp up - any limit? Maggies and Sanders Magetch.

The position of the volume knob in relation to spl is a result of the input sensitivity of the power amp more than anything else. It tells you nothing about how much power the amp is putting into the speaker. That power can be determined with the use of meter (measuring voltage iirc). Do a Google search for details on how to do it.

Thanks for the responses. JL35, I should have mentioned, I'd love suggestions on a good preamp match. As for sources, I'm using a VPI Classic turntable with an Ortofon MC cartridge, a Ray Samuels XR-2 phono preamp, an Oppo UDP-205 disc player, and Sonos. 

Does the Magtech have clipping LEDs? If those start to flicker back off a bit on the volume control.

how far the dial goes up is irrelevant, that speaks to the amp/preamp match, and also the source...technically, I think, the higher on the dial the less distortion from the volume control....but your system deserves a much better preamp...;

My approach has always been to turn it up until you see flames or smell smoke, then back off the volume a smidge...Seriously, I stop turning things up when the dynamics flatten out/hit a ceiling.