Question On Connecting Multiple Sources to TV, DAC, and Power Amp

I’d like to eliminate the Bose

Yup, that’s step one fer sure! Bose absolutely sucks.

You have too many sources to manage to try to route through the TV. Get a good AVR — I’d highly recommend Yamaha — that has the features/inputs you need and get some good, high-value speakers from Wharfedale, Elac, etc. and you’ll be light years ahead of where you are now on every level.  You just plug all your sources into the AVR, connect it via one HDMI connection to your TV and it will take care of routing all your various sources to the TV via the single HDMI connection.  Just my $0.02 FWIW, and best of luck.

Thanks soix.

I've checked out a few AVR's including some recommended on Audiogon but it seems a lot of them have a THD that's no better than, or worse than,  an old Sound Source amp and preamp I have. I also have an Adcom GFA-545 I'd like to run in place of the Kenwood M1A amp.

Since the THD on some of these AVR's isn't as good as separate it also make me wonder what the phono specs are, which most don't list.

I've also read about issue with many HDMI switchers.

This may take some time.

Perhaps you should stop using THD as the deciding factor. I haven't paid attention to it since the 1970's.

Soix is correct. You need to invest in a modern AVR and use it as a hub for all the components. Personally,  I use Anthem, but there are many options. What I would recommend is that if you do upgrade, make sure the AVR has the capability to output the front channels independently. This will allow you to integrate a two channel system with a home theatre bypass option sometime in the future when you get the itch for a better musical experience.