I have had a 557 for about 2 years and have loved it. It replaced an Acurus A250 and was definitely a step up. I bought another 557 this weekend and am running the pair as bridged monoblocks. I haven't had a chance to do a serious audition, but they obviously have near limitless reserves. I currently have Thiel speakers which do not have a bi-wire option. I think the real question is how do they sound bridged vs. how do they sound run in stereo mode to vertically bi-amp a speaker with bi-wire capability.
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