Presonus HP4 modifications

This was my first major modification project, something I've been meaning to post about for the last couple of years––it's morphed over time, I've added and removed components as I learned from other projects. The Presonus HP4 is an excellent and powerful headphone amp, and can be found for cheap on Ebay, Reverb, etc. I … Continue reading Presonus HP4 modifications

Rokit 5 G3 Limiter and Stand-by/Mute removal

Finally I got around to figuring this out. Had to poke around a little bit. Ran across this schematic in the land of diy forums. It's for the G2 Rokit 6 amps, which had the notorious black goo of death problem, so totally different design (well, probably not that different... these budget companies never really … Continue reading Rokit 5 G3 Limiter and Stand-by/Mute removal