I have a pair of the OMD-28's little brothers, the OMD-15. For a long time I was powering them with an integrated switching amp--the Onkyo A-9555. I tried several aftermarket power cords, including a Synergistic Research Master Coupler, Monarchy Audio PC12, and PS Audio Prelude (which was the best of the three for my application at the time). Then I decided to recable the interconnects and speaker cables with Zu Cable. The results were promising but mixed until I decided to go all-Zu and replaced the PS Audio power cord with a Zu BoK. Then everything fell into place with superior clarity, focus, and musicality.
Since then I've moved on to a tubed phono stage and line stage from Jolida with an A/AB power amp (with captive PC), but I'm using all Zu cables and matching Zu BoK power cables for the phono and line stages and am very pleased with the results.
Trying out the Zu is about as risk- and hassle-free as it gets. You get a 60-day money-back trial period and free shipping to your house. If you don't like the cable after giving it plenty of burn-in, you pay return shipping which is about $5.
The BoK PC was about $299 online. That line's been discontinued but you can still pick one up (with free shipping, 60-day return period, and full factory warranty) from Zu's eBay entity for around $100. That's how I bought my two. Or you can get a power cable directly from Zu's website from their updated, more expensive Mission or Event product lines.
Since then I've moved on to a tubed phono stage and line stage from Jolida with an A/AB power amp (with captive PC), but I'm using all Zu cables and matching Zu BoK power cables for the phono and line stages and am very pleased with the results.
Trying out the Zu is about as risk- and hassle-free as it gets. You get a 60-day money-back trial period and free shipping to your house. If you don't like the cable after giving it plenty of burn-in, you pay return shipping which is about $5.
The BoK PC was about $299 online. That line's been discontinued but you can still pick one up (with free shipping, 60-day return period, and full factory warranty) from Zu's eBay entity for around $100. That's how I bought my two. Or you can get a power cable directly from Zu's website from their updated, more expensive Mission or Event product lines.