Power conditioner and high end power cord

I have a very similar system. Mac C46 pre, Mac mc501 mono blocks , JL audio C1 (really nice device) and a pair of JL audio E112 subs. I have 4 dedicated 20 amp circuits in my audio room and I have a noisy power source (I am on the Philadelphia pa power grid). I can tell you without any reservation that proper use of power conditioning and power cords makes a very big difference. I use a shunyata conditioner for pre-amp, Cr1 crossover and a Bryston DAC with very good results. High current amps are another matter. I plug them directly into wall outlets with shunyata Defenders in spare sockets. I have also been swapping power cords in and out of my system and have found amps most effected. High current cords are necessary to allow the amps to “breath”. The subs have seem not to be as sensitive to power souce and cable. This maybe due to the nature of the built in amps.

good luck

No one mentioned shunyata products, I have heard they are the best and beyond anything on earth.

A good power cord has measurable effects on the equipment to which its connected. This can result in more power (less voltage drop across the cord), lower distortion and lower output impedance if a power amp is using the power cord. So it should be no surprise that its effects can be heard.

I have found that most power conditioners are a disappointment. But not all- the best I've seen so far was not even offered to high end audio (its industrial/commercial), made by Elgar. Otherwise we recommend that our amps be plugged directly into the wall.

The Elgar conditioners outperform every other conditioner we've seen (Furman, PS Audio, etc.). It employs a massive isolation transformer with a feedback winding. A low distortion oscillator is synced to the AC line frequency and the output of the oscillator is compared to that of the conditioner. A feedback signal is thus generated and applied to the feedback winding. In this way the conditioner can keep the output sine wave very pure with a THD of less than 0.5% and it can also regulate line voltage without limiting current within its capacity. The two most common models do either 1000VA or 28 Amps continuous(!). The are also older as Elgar got out of the market a long time ago, but for the most part they can be refurbished.

For power products Manufacturers each have there own techniques and build quality. My experience is that no one company has the absolute answer to every issue. I use Shunyata, MIT , Furman and Pangea power cords from Audio Advisers. I am an engineer (embedded systems) looking for solutions to my power issues. At the end of the day it is the best sound at a reasonable expenditure that matters.

Power Delivery is one of the most Important and undervalued Components in your system.

The more Power you get to your system the better it will perform.
Better Imaging, Sound Stage, Detail etc.

Ideally one should look to invest 25-30% of their overall budget on Power delivery. There are ways around that figure if you are willing to do some homework, have patience and purchase through a used market. 

"If you switch all the components to a higher end AC cables is the sound any better"    YES

"do you need just a high end power cord from the wall to the conditioner
and use the cables to the components that they came with"

If you are on a Budget, as most people are, the best place to begin investing is in the Power Chord / AC Cable from the Wall to the Conditioner. Then just begin to switch out PC as you have the budget for them. 
IMHO the next Power Chord / AC Cable to invest in would be from the Conditioner to:
MCD Source/ CDP 
C2600 pre amp 
JL C-1
MC60 Monoblocks
JL Subs 
If you listen to a a lot of Vinyl and have invested in new cartilage then you probably want to get a good PC for your turntable around the same time as your CDP. If not let that be another project when you are ready.

The Cable Company is a good resource as they will allow you to audition cables from their library for a membership

https://www.thecableco.com/

Cable Companies to check out $$$$$ - $$$

http://www.stage3concepts.com/

http://www.highfidelitycables.com/products/power/ct1u/

http://www.hb-cable-design.com/1_english/horizonnk.html

http://www.oyaide.com/ENGLISH/AUDIO/products_category/power_cord/pg631.html

https://www.analysis-plus.com/product/home-audio/power-cables/power-oval-2/

There are many others, take your time and enjoy!