I've been looking for another AVR. I have had 4 Onkyo's and one Denon, all upper end. Every Onkyo I've had except one had serious quality issues. in fact my first Onkyo was actually a gift to me from somebody that abandoned it at the audio visual store I worked at, once a national chain now dead. This was when I was working my way through college. It turned out wrong with Onkyo at the time was a blown fuse but I could easily go in, replace, and then it'd work for sometime. It finally died, whatever was causing the fuse to blow probably went. However you're always in love with your first.
I did try one Pioneer, still have it, but as technology changed I had to move on. Onkyo line has always had troubles from simple updates to the firmware that would kill the system, creating a massive recall of many products some people not even aware of, which is still in existence to this day if you check out the Onkyo forums. I think until December 2018 you can return a lot of the first TX NR x0x and x1x series, e.g. Txnr717. however they had other issues such as bad HDMI boards.Those were recalled andyou are on your own to fix them.Unfortunately the onlyrepair shop that I know of that's officially qualified is either in New York or further away, and shipping is at your expense. I used to be able to repair these things but life moves on.
It's truly unfortunate because Onkyo was once the great brand. Aiwa components were also ranked very highly back in the day.It's such a shame they didn't make the digital switchand was bought out and killed by Sony.The same can be said with Athena speakers being bought out by APIs and Kiplch only to be killed. Still great sounding speakers on Onkyo's even if they're old and Onkyo's break. However with later Onkyos and recent speakers, Polk, Boston Martin's you're absolutely correct. They just don't seem to match well with the high end sounds. Piercing was an excellent adjective used earlier. You can try to tweet them through the internal equalizer but I really haven't noticed much change by changing without making everything muddy.
Denon is not as bright which was said earlier, but it is much more accurate. It also doesn't have all of the issues. I really don't understand Onkyo's issues because all of these technologies are pretty straightforward put together electronically. Onkyo is a Japanese based company which means harmony. However when Japan was known in the past for quality, companies are now sacrificing it for profits. CEOs of different companies have had to resign because of this.
I am beginning to think the best way to handle all of this will be separate. Either that or wait until the very near future when AVRs are not required since everything will be wireless as the 802.11ay standard will with multivendor you know I want to 200 Gb per second in a localized area, e.g. home theater. ISPs are going have to increase their bandwidth if they want to broadcast without compression. Japan already has 8K TV 2016 with 22.2 surround sound broadcasting to its consumers. We are years behind other countries. It's very sad that we get their leftovers. United States is also 22nd in the world in Internet. ISPs were given the money in the late 1990s by the government to make sure that the country was well wired, but companies instead found loopholes and pocketed much of the money. Sad but true. However 8K TV with 22.2 surround sound can be compressed about 50 megabits per second which won't look as good as uncompressed or sound as good as uncompressed but is capable of being broadcasted and steamed as we speak.
Can you imagine wiring a home theater for 22.2 surround sound? Then figuring out that you have places because a little bit differently? The answer is in wireless active speakers, with some of the audio adjusted internally and some of it on the cloud compensating for room configurations, speaker placement, and sound waves cancelling. The new 'Audessy" will be in real time because computer will be at a new level as quantum computers are rolled out. Quantum computers already exist though they are costly and being sold to companies like Google, NASA and the NSA. Microsoft predicts within the next 10 years they will be commonplace, and much of the computing that are on our desktops will happen in the cloud, as computing power there increases by a factor of 10's to 100's of millions. It will likely be getting machines also just transmitted the results of her actions rather than having home PCs/consoles. We are slowly moving back to a centralized system at least until some help quantum computing can be moved into homes which will be quite a feat considering the processors have to operate near 0 Kelvin.
AVR companies for the most part do not have a bright future considering everything with wireless except for some audiophiles that demand wired connections with separate amps. At first I just don't see AVRs incapable of feeding 22.2 surround sound for the 30 channels that the Japanese standard is capable of today. That would be one massive heavy power-hungry AVR, not to mention expensive. The main problems with AVRs is they constantly change the standardsand therefore you have to upgrade. Even today's state of the art, in the USA, AVRs are ALREADY obsolete as the companies know that the 8K standards exist, are being used, and have many more sound channels. 8k monitors and tvs were already introduced at CES 2018.
The next 5-10 years will dramatically change technology and most of what is being sold today will be obsolete. Passive speakers maybe saved if they are separately amped and connected with an AI model, but newer speakers will likely have more circuitry built in to connecting with a real time AI, adapting the sound stage based on other speakers in the room, objects/people in the room and the shape of the room (along with each person's customized hearing profiles calculated within). Google Home Max already does some of this, and I have no doubt other companies in silicon valley are tackling the details, as a major speaker company was just bought out by a silicon valley startup.
With regards to today's AVRs and specifically the 575 and 676, there seems to be a lot of them being sold aftermarket. Not a good sign for a one year old product, esp with a noticeable percentage being sold for parts, or not working.
Even mine I'm having to send to only under warranty for repair.