On the balance of probabilities, I would say it is compatible. The Sony has all the necessary digital and analogue outputs so, with the correct cables, should work fine. Please understand that I don't own the Denon speaker but I do have 20 years of working in the HiFi industry. Good luck! Nigel.
Standard Sony warranty is 12 months but you can normally buy an extended warranty for up to 5 years but with a commodity at this price you have to seriously ask - is it worth it? It's usually cheaper to buy new again than pay for the extra cover