Most harsh/shrill sounding speakers (vintage)


Aside from the Yamaha NS-10M Studio Monitor, what are the worst sounding speakers that can make your ears bleed and provoke listening fatigue instantly even at a reasonably low volume. Speakers that are too bright, too snappy, too "honest", y'know, speakers that just sound like crap. The worst sounding speakers ever, if there is anything worst than the Yamaha NS-10. 
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As mentioned above, many old school speakers were heard being driven by cheap receivers, but the fault is laid at the feet of the speakers.
JBL Century L100.The worst sounding tweeters I have ever heard.Sizzle?More like the sound of somebody with a severe case of the shakes doing some arc welding.