I own both the Outlaw 950 and Monitor Audio Gold 60 series. If he has the Gold 60's he should not be hearing any forward sound. If the Monitors have had time to break in and they have been calibrated with the 950 his system he should be good to go. If he has the Monitor Audio Silver series he may be missing a little on the bottom. I used both the Outlaw amp and a Parasound with my Silver series and found the Parasound matched up well with them and helped give them a fuller bass responce. He may not be hearing brightness from the 950 or the Monitors, but a more defined sound, with separation and clarity. It may be so revealing that he is hearing some of his material for the first time the way it was recorded. Audition different music and Movies as Alejate suggests, he has nothing to loose with a 30 day home trial.