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Question: How do you add a power switch to it? Thinking on buying  one but wanna know that first.
Document: Installed this on my 2011 Yamaha Stryker yesterday. First off installation was simple, attached the speakers to the top of my mirror stems ran the wires and did the simple wring of the power wires. I used and would recommend using an add-a-link fuse holder as this made connecting the power wire to a key activated circuit super easy with no cutting in to other power wires.
I bought this after buying and returning the shark system. The unit sounds great even at highway speeds with straight pipes. The only thing I did not like is that the remote volume knob has no real mounting options.. I have it attached to the bars with a ziptie. Not pretty... Also there is no power switch so you have to buy and wire your own. Not a big deal but worth mentioning..All in all this is a great sounding system.
installed in about 4 hours but I permanently installed it.. the amp fit nicely under the seat and I ran all the wiring under the tank  I did have to remove the tank and seat  I had some help for about 1 hour just to help hold up things .I purchased an item from the auto parts store called (add a circuit ) this fuse holder was where I connected the power for the amp I also installed an off/on switch  from the auto parts store  this is a good idea.
Here is my review of the Boss MC-400. I ordered and the first one came in 4 days with standard shipping. I was going on a road trip in a week on my Harley softail. I spend two hours installing the a USB and lighter plug setup on the handle bars and the Boss MC 400. Let me point out that I am a radio Tech by trade. After all the wiring of the Boss MC 400 I turned on the power and a loud hum from one speaker.
The speakers look good mounted on the mirrors in my opinion but the one bracket that goes over top of the brake fluid housing wasn't tall enough so i had to bend it a little to get it to fit over. Also you need to buy a toggle switch to turn the system on and off or what i did was splice into my power commander wire or any aux type wire that only comes on when the key is turned on.
I made a simple mount for the Clip and attached it to the handlebar. I hard-wired power through a 5V regulator to the battery. This introduced another ground loop, which I took care of with a PAC 3.5mm Ground Loop Isolator.The Boss amp has a remote volume control that is easier to operate than the Clip volume buttons, especially with gloved hands. I mounted that near the key switch.Sound is fairly good, about what one would expect with only 3" drivers.
I have a cruiser with loud pipes and no windshield and I can hear the music just fine. Wish I was able to add a little more bass to the music but other than that, it is crisp and clear. My wife riding with me can hear it also. The remote volume is handy. I mounted mine on the left side with other cables and wires that hide it pretty well but still easy to get to. I was skepticle at first but glad I bought it. It was easy to install.
this speaker/amp combo is a good deal for the price . sound quality is good up to almost full volume.plenty of wire to connect to the wiring(i spliced into the tail lights so the amp shuts off when the motorcycle key does). this unit does not have a shut off switch ,u can add a toggle switch easily to do that.
Well, I have it installed. The only thing I was not happy about was that there was no on / off switch on the amp. The directions say to hook it to the battery, didnt want to run the battery down so I had to add a on/off switch. Other than that I LOVE IT ! It looks great, loud clear sound even over my loud Vance and Hinds pipes. More than worth the cost.
I insalled this system on my heritage softail and so far am very happy with it. I ended up putting the amp in the windshield bag so that it was concealed and all the wires were then long enough w/o having to add on. I routed the power and ground wires under the tank and hooked the power to a source in the fuse panel that only had power when the ignition is on, then I insalled a inline 5amp fuse.
Answer: I guess you could put in a in line switch. I wired mine into a source that comes on with the key.