need an affordable atmos pre/pro or receiver

Checked for ground loop issues with just using the receiver, in short it will hiss at higher volumes with nothing except a power cord. Multiple power cords and outlets even used a grounding cable. All speakers hiss with different brands both 99db sensitive and Polk tsi 200 which are maybe at best 90db sensitivity. Using 12 awg heavily insulated wire for the longer runs of wire. And best evidence is 2.0 channel direct mode gets to +10db with no noise. Btw if I did not mention the noise is a hiss you can hear when paused or nothing is plugged in at the high volumes. The speakers can handle 1000 watts for the front and the surrounds 450 watts all rms. So speakers are perfect, Dirac live is perfect and amp is perfect, well I wouldn’t mind more power for overhead and potential but weak point right now is by far the noisy dsp on the receiver. Hoping for a holiday buy as I spent a a few thousand recently. Was hoping to find a receiver or pre pro around 500-1200 new either last year model or current. Just didn’t know if there was any good options and most places I look a pre pro is $2000-$5000

They can get pretty loud without an amp but I wanted to get Dirac live and best way was mini dsp but it required an amp as you can’t send the signal back to the receiver. Plus higher and cleaner power doesn’t hurt with an amp. Plus I can keep the amp probably for many many years and just buy a bare bone processor cause with Dirac I don’t even need room correction or eq functions literally just decide and send out the signal. I’ve spent 500-800 on receivers in the past each was ok each was acceptable until higher volumes, either dsp issue or just other issues like not hdmi 2.0b for 4k hdr. My current receiver has 2.5 years warranty left but I borrowed a friends that is the newer version. It went from clean at -10db to clean at -4db so better but what is the chance both are dud onkyos. Cost to ship the onkyo and not for sure it would be fixed to even reference level. I’m looking to buy something else. I don’t care about brand or anything other than it can do atmos and other modern decoding has 4K hdr support and is clean to +10 dB which is louder than I need cause that like 120db with my speakers but I want that ability as it shouldn’t cost $2000. Saw a marantz 6013 new for $900 right in the middle budget with pre outs. Would this be clean power? Any issues to be worried about or better options??