We always use CAT mono amps with Mbl 101 mkii. In fact, they were shown at CES at the CAT room couple of years ago. On another hand, I have heard some 300 watt tube amps sound flimsy with MBL. It is not that they could not play them loud, they simply did not have any weight and woofer control. 101e need lots of current, and most tube amps fail to deliver enough of it.
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Dealer disclaimer .