My father is planing to buy a new power amplifier to replace his old one (YAMAHA DSP-A590). He was about to choose Denon X550BT. But I found that its price is even getting higher in the Double Eleventh Shopping Festival (just like the Black Friday, right now the shopping festival in CN has become a math test XD. After you doing the calculation, you would find that you didn't get any discounts). And I learned that he didn't do any preparation for it, he justed opened a shopping app and choose one randomly XD.\nAnyway, is there a better choice which costs below 3000 CNY (about 450 USD)? I would appreciate it if you guys could kindly give me some advice XD!\n\nCorrection: he told me that DTS X is a must, so the budget could be a little higher.