The difference between the Synergy 11 and 11i is an amplification board that according to Jeff Rowland lowers noise and distortion . One of the ways you can tell if you have the 11i is the display is green. I have only heard the battery pack on the previous top of the line Coherence preamp. It seem to lower the noisefloor but to my ears it wasn't a significant improvement for the cost. My Rowland dealer told me that if you live in an area with exceptional dirty power that the battery pack was the way to go or otherwise the 11i would perform at the same level. Also, I'm not sure the battery pack is still in production.The Synergy 11i is an excellent ss design . I had both the Synergy 11i and the Cadance phono in my system and while I thought the 11i was excellent I was more impressed with the Cadance phono.
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