Well, WAF factor aside, I have a pair of Alto Utopia Be's, and I find the bass to be pretty crushing at times. They don't officially drop down to 20 hz, rather 30, but I haven't felt any disappointment in the bass reproduction of these speakers and they meet your 10 K limit. I'd take them any day of the week over the Mahler, the Amatis, or the Thiels. I don't care for any of those speakers. They may go slightly deeper in the bass compared to certain of the JM Lab line, but they lack the high frequency extension of the Utopia Be line. As always, YMMV.