Problem with system

See above, I bought new integrated and speakers to troubleshoot.  Cables were swapped out also.  Speakers were taken to local repairman.  He hooked them up to his system and then called me to come pick them up.  He said they sounded very competent.  No issues.  Aerial says crossovers on model 6 don’t blow, but check tweeter (they sound normal on integrated to me).  Checked ohms on both connectors on each speakers, across each binding post 4 ohm if I remember correctly, complete circuit.  I took a year to go through all permutations of possible problems ( that I could think of).   Whatever is left, no matter how unlikely, is the problem. 
 

Thanks everyone for your response. 

Does this occur when cold or after the gear has been run for some time? Perhaps a faulty component exposes itself when the gear is heated up.

I own a Shiit Brfrost and have for 5 years. It still works perfect.

1. Try new quality interconnects between the the DAC and the preamp input. Optical  between the  steamer, CD, might be a good idea.

This is a big one 

2. RFI in the voltage line will wash out the digital quality. Try a cheap Furman power strip for a test. If improved, then go for power a conditioner. I suggest a tripp lite 1800w model it also compensates for low, or high voltage, noisy power which dramatically affects digital quality. My system is silent for hum or hiss at high volume.

Additional:

3. I use 10 gauge speaker wire. I got it on Amazon, oxygen free, works great for me.

All these suggestions are relatively cheap, but could make a huge difference. Each made my system sound better. Good luck.

I would think you caused a problem when you installed the new DAC. You probably damaged either your incoming cable to the DAC or the outgoing cable to the Pre or Pre to Amp.

Did you move anything else around when you installed you new DAC?

Sounds like a typical XLR broken core.