The best replacement for wa6 is wa6se.

The best alternatives to wa6 are rated as following:
★★★★★  wa6se
★★★★  lyr
★★★★  wa3
★★★  bottlehead crack
★★  ha-160
★  wa7
★  wa2

Your alternative for wa6 is not listed? Suggest!
Speaking about wa6, one probably shouldn't forget about hd800.

Other search terms related to wa6 and their ratings are:
★★★★★ hd800
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wa6
wa6se
lyr