It's just that the Shindo is capable of much higher performance than it will give when paired with the BC amps. You'll get some of the tonality that Shindo is known for, but the BC amp's circuit will mask much of its magic. Pair the Shindo with a Shindo power amp or at least another tube amp of similar caliber and you'll be able to hear what I'm trying to describe. It's often hard to put sonic differences into words, as it must just be heard to be understood. The Shindo/BC combo will work, but it's just not an optimal combination to get the most out of the Shindo. Just my experience, YMMV applies.