This might come as a strange question, but I wanted to solicit the opinion(s) of the people on this board. I have an amp from a prominent manufacturer that has failed 3 times over the course of a month (and has been repaired by the manufacturer). We've gone in circles trying to discover why this would happen, and after the second failure, the manufacturer suggested that it was either my X7 or the Sparkos op-amps which have led to the amplifier's failure. Prior to these rapid-fire failures, I'd used the amp without issue on a daily basis from March of this year through late-September. The sparkos op-amps and X7 were a part of my rig for my entire ownership of the amp in question, so I am extremely reluctant to think that the amp could have been fried by the X7/op-amps after properly functioning in the chain for about 7 months. Has anyone here experienced any issue with X7s killing their headphone amps when connected via RCA out? I know that many people here use the Sparkos op-amps in the X7s, and then feed its signal as a DAC to a dedicated, secondary headphone amp. Have any of those people had issues using this type of setup in the past? I am not here to smear the manufacturer in question, as they have demonstrated superb post-purchase support and are willing to offer me a refund, but I'm confused by what has transpired. Any thoughts or experiences would be appreciated!