Hare Krishna
Thanks for your answer. What i was thinking when i asked if there was a contradiction with Srila Prabhupada's teachings was that, in my ignorance, i was afraid that using a medallion with Sri Yantra could be someway related with impersonalists. I doubted about that because i thougt it could be something like adoring an impersonal energy and not the form of the Godhead. But from your answer i understand that there's no contradiction. Thanks again.
Haribol.