Conclusion: This thing is great. It's compact and easy to get to. Much easier than trying to adjust knobs on the amp. I love how you can adjust the voltage up to 9 volts. Makes MUCH more clear and tighter bass and i also noticed that it's louder. The bass EQ is accurate. Sturdy casing and connections. Great buy. The remote that came with it went out so i had to send the whole unit back and have it replaced. Thats why i gave a 3 for durability. Other than that this unit is great.
Conclusion: I purchased the MX-3 because my HU did not have enough voltage to supply my amplifier. I did have strange noises at first. Thought it was a ground/power problem. After doing upgrades and making sure those were good the problem got worse i thought the unit was defective so i turned it down just a hair and noiced that the strange noises went away. After adjusting and adjusting all the strange noises finally went away and my system sounds great.
Conclusion: Love the way you can tune the sound to how you want it but. For some reason I would get random noises that was not on the song when it was hooked up. Not engine noise but almost like it was making its own random low notes.
Conclusion: My amplifier lost its ability to adjust gains and frequency response range. I thought i was going to have to replace a very expensive out of warranty amplifier, but I knew if I turned the outputs all the way up on the radio, I still got some good sound. I just didn't want do drive the radio that hard, so it made me think of this! Perfect solution, the amplifier still works great, and this drives a great, clear and clean signal to my amp.