Bought these because the Legacy LM57 5.2534; 120 Watt Carbon Injected Midrange Speakers were not available. Used the LM57s to replace blown speakers in Optimus PRO X77 previously. I use these for my rear channels in a surround sound system. The PDMR5 do not sound anywhere near as nice as the LM57 speakers. The base end and the mid range all sound inferior. I repaired two X77 with the LPDMR5 really as backup in case I have another failure; however once the LM57s become available again I will buy them.