This is one of an audio accessory from KOJO Seiko in Aomori in Japan. This is a virtual ground. Inside its small chassis, there are eight layers of metal plates.
I first used it with the switching hub S100, connecting it via a Y-lag through the JS PC AUDIO (Also Japanese audio accessory company) LAN terminator.
As usual, I tested Roon playback with the CA1000T.
Given that data comes through an optical-isolated hub and a wireless LAN access point downstream of the S100, I honestly thought the effect would be minimal.
However, contrary to my expectations, the improvement was significant. I felt a clear step up from what I thought was already high resolution with excellent sound separation and no noise. The boundaries of overlapping instruments became distinct yet naturally discernible. Despite the clarity of the sound, it didn’t feel tiring at all; it turned into a truly enjoyable listening experience where I wanted to keep listening indefinitely. In fact, what started as a test ended up stretching into several additional tracks, taking much longer than planned.
I had initially considered adding multiple units, and after witnessing this effect, I’m now thinking of connecting them to all my equipment.
A few days later, I added three more units. So far, the first unit still shows the most significant effect. It seems there are critical points depending on the total audio system, but trying every possible combination would be too overwhelming, so I’ll make that a long-term goal.
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