I prefer sealed box 10 out of 10 times a day. Its more wattage to achieve equal SPL's but it just sounds better/tighter, and that is all that matters to me.
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J.Mimna Photography
Live Concert Recordist

Outlaw 970>
Emotiva XPA-2>
Martin Logan Preface

Some Of My Live Recordings: http://www.archive.org/bookmarks/J.Mimna

My Concert Photographs: http://www.flickr.com/photos/jimna/collections/72157613267633153/