That's not Sony's fault as such. It's the same situation with most electronics these days. They are built to a cost and not really serviceable. Most modern TV's these days are not serviceable after 3-4 years of manufacturing.Sony rejected to repair the motherboard that's why it's causing too much chaos now.
Can you please give me few links or model name of correct amplifier for them and how many amps would I need !
Some of the receivers have biamp feature. Look them up. You can use that to drive your speakers with proper crossing over.