This is my $1600 Meridian Prime headphone setup. The headphones were purchased new. The Meridian Prime amplifier and power supply were purchased on eBay.
Raspberry Pi 4 running RoPieeeXL $73.71 from Amazon
Meridian Prime Headphone Amplifier $449.16 on eBay
Meridian Prime Power Supply $530.00 on eBay
Dan Clark Audio AEON Open X Headphones $516.12 from Drop.com
Total $1568.99 and worth every bit. Thanks for your help Robert @rrwwss52