I'm very familiar with the Sennheiser sound over the years. Have heard the 650s. I currently have a half dozen or so phones (2 Sennheiser) and same # of speakers.
OHM Walsh speaker sound and Sennheiser phones have similarities in regards to coherency, tonality and not overly bright, ie non-fatiguing. OHM Micro Walsh used would come in under $1000. Totem Arro is another speaker I have heard that comes to mind.
OHM Walsh speaker sound and Sennheiser phones have similarities in regards to coherency, tonality and not overly bright, ie non-fatiguing. OHM Micro Walsh used would come in under $1000. Totem Arro is another speaker I have heard that comes to mind.