@Anand Singh,   Welcome to the Klipsch Community forums.   The first thing to do, if you haven't done so already, is to review the Cinema 600 support articles.    Klipsch has been very good at providing warranty replacements - if you are within your warranty period. If your warranty has expired, I'm afraid you are on your own.   The Bar 48 No-Power Repair Thread has become the go to place for all Cinema & BAR series soundbar power issues.    Then there is this: Cinema Subwoofers - Woofer Removal and Replacement.   I'm sure you can appreciate that detailed troubleshooting is difficult without access to the actual device. Once you have isolated the problem there's a good change the forums can help you find a solution.    

@AndyMan_ this is nearly a 6 year old thread with many members who either no longer visit or visit rarely.  My advise is to start a new threat in the technical section.  But  be aware that Klipsch does not approve of modifications, therefore, you may get best results over at Audiokarma.    Technical section.   https://community.klipsch.com/index.php?/forum/28-technicalrestorations/   Audiokarma   https://audiokarma.org/forums/index.php?threads/klipsch-modifications.1008584/    

So I can help try to help, I am trying to keep things straight in my head. What Sony equipment do you have? Do you have anything else?

@wetowne posted some insight 4 years back, maybe he can provide some insight on his current experience. 

@babadono, please update on your findings.    

I have a pair of Heresy II with the rectangular input cup. I replace the capacitors on mine last March.   There are four (4) caps on each crossover. The caps are soldered to a small printed circuit boardthat is attached to the cup with three (3) screws. The board also has the tips of  the binding posts that stick through the boards and has a bare jumper wire soldered to them. I had some trouble getting those wires attached as the jumpers are short and heat transfer caused the othe end of the jumpers to com un-soldered.   I came up with a soluution which I can detail if you wish. Different capacitor types will change the sonic signature of the speakers.   I'll post some pictures later when I have time.

What are people’s thoughts on powering Heresy IV’s with a Topping MX5?   I’d like an all-in-one Amp and DAC for simplicity. Topping are very low distortion Class D amps paired with quality DAC‘S, however they are extremely neutral with minimal sound colouration so I’m worried will make the Heresy sound too clinical, compared to a warm vintage sound with a Class A or tube amp.   Heresy IV’s will be mainly used for home theatre, plus the occasional listening session. I listen to all genres from classical and jazz all the way through to electronic and hip hop.

I have taken pictures of both my units. One is from 2014 with musical note logo. Bought it second hand from @cincymat here on forum. Second unit is from ebay seller in Hong Kong(China in other words). Has 2023 date code. Seller wanted some astronomical $$ I bid them down considerably. Has the different logo. I will post the pics tomorrow...as far as I am concerned I have convinced myself the Hong Kong unit is genuine Xilica. I believe @Gnote also purchased one from same seller.

I don't believe anyone is born with a critical ear, it's something that is developed. Everyone's ears are liars to the ear's owner and the only way to hear the difference is to AB them. Too many times I have let listeners hear on system A their favorite tunes, and hear them say that they have never heard it sound so good. Then let them hear the same tunes on system B and let them hear what was missing on system A. Similar to your speakers and your whole system: You won't know what sounds better or worse without listening to what you have, then make a change. It's like adding salt to a plate of food without tasting the food first. A first-time buyer who buys the ultimate sounding system will not know how good it sounds. This hobby is not a destination, it's a journey.      I had a pair of HII with round cups, which made capacitor replacement more difficult. Although I have recommended you pump the brakes on any changes, if you're going to keep them, refreshing the capacitors is a move in the right direction.  To make a better sound now, as I see it, you have an ABC or more options. In descending prices:  A - refresh your amp with new caps and such (an amp that old really needs it) B - replace your amp but be selective about what you buy C - refresh your caps in the Heresy. 

Oh yeah, supposedly the kids are going back to school tomorrow on a 3 hour delay. They have only had one day of school since Dec 20th.