Biker, the D15 is just a small two-way where biamping is really unnecessary. The upper amplifier would just be driving the tweeters. Get ONE higher quality tube amplifier with 50 watts or more and biwire.
The only way to even have a chance at decent, coherent, sound when biamping a two-way where the crossover is in the critical human hearing range would be with identical amplifiers. But why bother? It's not only a waste with this speaker, but is more likely to do harm than good.
The only way to even have a chance at decent, coherent, sound when biamping a two-way where the crossover is in the critical human hearing range would be with identical amplifiers. But why bother? It's not only a waste with this speaker, but is more likely to do harm than good.