That's totally awesome Denon1! Yes, you can do the breakin largely without engaging the speakers.... Just leave the power amp on standby, so that the amplifier's inputs are active and so complete the circuit with the operating player. Particularly important, I suspect, if you use XLRs. Find a good break-in CD/SACD and play that more/less continuously.... Harve and the rest of the gang have much more info on good break-in disks than I do, so I leave it to them to make meaningful recommendations. By the way, it is worth while to turn the player completely off once a day for about an hour, and then resume break-in... This cycles capacitor charge, etc.... The result is expected to be a faster and more complete break-in.
I have created a break-in spreadsheet with MS Excell that I use to keep trak of break-in, take notes, and project break-in time and completion date.... It is a lot of fun to use... If you like, send me a PM, and I will be happy to send the spreadsheet to you. By the way, do not write any e-m-a-i-l addresses in PM, or the Audiogonic server machine will prevent msg delivery.
Saluti, Guido