Magnepan 3.7i vocals sound harsh

I would suspect it's either the Halo integrated or cables.  I always thought the Halo was bright when I had it in my system.

Although the Halo Integrated puts out 160wpc into 8 ohms and 240 into 4, it doesn't put out that much current.  Look at the power supply in the amp, at best there is 40uf of caps per channel.  That isn't much energy storage.  I would try an amp that is known to drive the Maggies well and then go from there.  If you want the band aid approach, I would try some warm sounding speaker cable,  Audioquest comes to mind or the older MIT cables.  I would also ask on the Planer Asylum over at Audio Asylum.  Those guys will know for sure and be able to help.

John, I am sorry to hear that. I  thought the Pass equipment had taken care of it.  

John,

you our got some great hints here to help you.  I got your email and want to hear your system once you get this taken care of.  Once you get to the highest resolution that your system has, it’s the little things that can make or break it.