http://www.dvdrwinfo.net/bbs/zboard.php?id=hard_review&page=1&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=115&p_v=1
it's Korean dvd hardware forum but you can see some graphs here.
A11 provides most impressive quality for 16x recording to me.
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