Originally Posted by bronxkid
i'd like to ask those using their Martin Logan speakers in a dedicated home theater room what AV receiver are they using to power their speakers and if they are using a external amp. I didn't realize when I made my purchase that the motion 40's and 30 are 4ohm rated. I am also getting a pair of lx16 to complete the setup along w/ with my sub.
Good call to focus on this. I installed Theos fronts and a Stage-X center several months ago. Did a bunch of research on the questions you're asking. Got a lot of conflicting advice from a number of smart folks.
I use a Pioneer VSX-1120k AVR as my hub. It's pretty capable, and specifically rated for either 6 ohm or 8 ohm usage. A number of resources I checked with said it would have zero issues pushing the 4 ohm ML's. Others were unsure. Others said don't even try.
But what tipped me to toward buying more power to drive the front 3 ML speakers was:
First, an ML tech explained that on my speakers, the actual challenge would dip down below 4 ohms to the 1.5 ohm range on certain frequency challenges. So at times, the 4 ohm challenge wasn't the actual challenge my AVR would meet, it was going to be significantly more than that.
Second, my VSX-1120 does everything I want and need it to do as a hub. Has all the right input and outputs and decoding capabilities and all the rest. I didn't want to have to replace it ahead of schedule because I asked it to do something it really wasn't designed to do.
Third, I have long speaker wire runs from my media closet to the front of the theater room where those 3 speakers sit. Each of the runs was about 90 feet. That adds to the power challenge.
And fourth, I didn't want to buy these new speakers, and then feel like I couldn't just let them rip without worrying about clipping the speakers or blowing out the AVR, or both.
So after another wave of research, I got an Emotiva XPA-3 to drive the front three speakers, and I let the VSX-1120 drive the remainder of the 5.1 speakers. It's been the right choice for my particular room and equipment. Good luck, and enjoy your new speakers BK!