I have been an MB Quart fan for a long time. I purchased a pair of these for the front and a pair of the Reference models for the back. I have them paired with an MB Quart 5 channel amp. I am was very methodical with my installs, ran completely new wire all the way around. First they sounded ok, quite a bit bright but I set them at 0 on the crossover and took care of that. I tuned the system, I've been doing stereo installs for at least 25 years and they had a lot of static at low volume. Sounded blown. I reworked everything still the same. Ordered another pair and install the new ones. Same thing sounded good. On my way home I was listen to music, not even halve volume and I notice the sound started to degrade rapidly. I got home went through the system again, switched wires, channels, everything and same result, sounded blow.

Do yourself a favor and stay away from these speakers.. MB Quart, you have a problem. The "lower grade" models I installed in the back still sound good, no issues what so ever.

Sorry MB Quart, not good.