Center Channel on an Integrated Stereo Amplifier


Background: I have an integrated 2 channel amp for stereo listening. I added a sub to it with a direct connection to the terminals on the back of the amp (2.1 setup right now). 
I also want to have a Center Channel that I can connect and disconnect when I want (so I can listen to the 2 channel for music and have the center channel connected for movies). I have a really good amp, so I would love to be able to use that amp to power the speakers when watching movies (and power the center channel too if possible!). 

Question: What is the best way for me to get this done? 
For me to have a 3.1 setup - a 2 channel integrated amp with 2 speakers, a sub, and a center channel WITH connectivity options so I can disconnect the center channel whenever I want. 


Thank you all for your help,
Shawn 
128x128shawnpmathew
And then factor in what the money spent on the center channel could do to improve your 2.1    curious if you listened to the 5.1 as a 3.1 also...
Okay, here is my entire setup so far:

1. Martin Logan Vistas - Speakers
2. PrimaLuna DiaLogue Premium Integrated - Amp
3. REL R-505 - Sub
4. Simaudio MOON 300D - Dac
5. Emotiva ERC-3 - CD Source
6. Simaudio MOON 180 MiND Streamer - Dedicated Streamer
7. Panasonic DMP-BDT220 - Blu-Ray player

https://systems.audiogon.com/systems/6604


I am looking into getting a Martin Logan electrostatic center channel to match my speakers.
On top of that, what should I look into?

And if you guys have any suggestions on how to improve my system, I am all ears :)

Also, after reading all the replies it looks like I am going down the wrong road. If I want a home theater experience, I should do a home theater.. Not try to make my 2 channel listening system into a 3.1
Thanks for the advice!


Thanks again for all the help!
Shawn
@david_ten - To answer your questions: 

1. The 3rd channel would come from my Blu-Ray player 
2. The Blu-Ray player connects to my DAC via optical cable. 

If I were to do it, I would keep my PrimaLuna. I do not want to replace that amp. And it does allow for a bypass or pass-through 
Nice system. Trying unplugging all the video components when listening to music. That was a recommendation from Charles Hansen of Ayre. Works for me. Unplug streamer too when listening to CD
@jl35 - That is very interesting. I will try that this week and let you know if I hear a difference. Thanks for the suggestion!