Asymmetric Room

@signaforce agreed on the Qutest!!! I noticed the samevthing - left on it sounds worse after some time and requires a reboot. I would say if possible look into upgrading your dac. There are a lot of good choices there not expensive. 
 

@adsell Great recommendation. I do have ferrite rings (wall wart cables wrapped) and chokes on all my wall warts. Never thought to add to my upgraded power cords. That would be one big choke. Any idea what size?

@audphile1 Interesting you had a similar observation with the Qutest. I would buy a new DAC if I knew that would resolve my issue. chatGPT recommends one of the Holo KTE DAC's, (Spring or May)  believing their sound would be more compatible with my R11's. 3 things.

1. I like the dynamic crisp sound of Chord

2. The size of the Qutest is perfect, although I could potentially install a larger DAC where my headphones currently sit.

3. I wish I could find a try and buy / diagnostic DAC solution. My Schiit MM2 installed on my secondary system recently failed, so unfortunately I can't swap it out for diagnostic purposes.

I have a free day today, so will be playing with different possibilities. Thanks! 

May be try a tube DAC? LTA Aero could be good if you don’t need DSD. They may still have home audition with return policy. Or PS Audio DSD MkII which will be coming down in price (expect good deals on TMR with return policy).

OK, The following were my actions.

• I unplugged all non-2 channel components (and all 2 channel components not related to streaming). 
• Rerouted and further separated all cables
• Unattached TV cable
• Ran an ethernet across the room to ensure no interference
• Attached ferrite to power cords for conditioner
• Changed USB cable back to my old cable
• Disconnected my iFi DC Blocker+ from my preamp

Still got fluctuating frequencies at upper mid range

My next steps were to change speaker cables and bring my secondary speakers upstairs and try them.

Then I thought... listen without my hearing aids... suddenly the fluctuating frequencies were gone. My top of the line Signia hearing aids!! Also explains why it has always kinda been there. Have contacted my audiologist. Could be an expensive fix, but at least I got to the bottom of it.

Thank you everyone for you help and advise. @audphile1 The DAC may need to wait. If I need new HA’s, it will be $6K. I do like the LTA recommendation. As always, you provide excellent advise.

If I was getting glares from certain artists in my room, being Canadian, I would very politely ask them to leave.