Passive and active biamp together

Marco,

I finally took a good look at your system. Wow, I bet it sounds amazing as it is. I also had a look at your speaker's specifications and I don't believe that you need to bi-amp with a 50 watt amp. I have never heard an 845 tube amp, but in my opinion single ended zero feedback set designs are the cream of the crop. Congratulations on all that beauty.

Kudos and Cheers,

Ivan

Marco,

The outboard crossover made a huge difference for me. I was trying to run relatively inefficient speakers with an 11 watt tube amp. The amplifiers were really struggling to drive my speakers. The outboard crossover took most of the load off the amps, allowing them to focus on the midrange and highs. I used a solid state amp to drive the bass. The result was magnificent. My upper end gained in detail and focus, the soundstage got deeper and better defined, the tone got sweeter, the entire soundscape changed--night and day, really.

That said, I don't know what it would do for your system. I believe your amps can do 50 watts into 8 ohms, which is not inconsiderable in tube terms. Whereas the outboard crossover was almost necessary in my situation, it would be more of an enhancement in yours. Certainly, dedicating an amp to your midrange and tweeter alone will have a positive effect; but, it is hard to say how dramatic the difference will be.
I do believe, however, that the difference between passive and active bi-amping is significant in every circumstance. In the case of tubes, the imperative is a good match with efficient speakers. If you love your speakers, they happen to be inefficient, and want them to play nice with your tube amps, then active bi-amping is a very good solution.

I hope that was helpful.

Cheers,

Ivan

Marco,

No, I did not remove the internal crossover from my speakers. I simply removed the jumper between the binding posts. My situation is very similar to yours. A third set of amps would be required to remove the internal crossover, a separate set for the tweeters. Additionally you would also need to know where the tweeter crosses over with the midrange. Some people do actually tri-amp, but it would have been overly complicated, not to mention expensive, for me to do it. I'm sure, were you to want it, that the fine folk at Marchand would be willing to build you a crossover to manage the task. But, I can't imagine, unless you are feeling wildly experimental, why you would want to try that. I bi-amped out of necessity, not adventure. In my case, bi-amping pushed my speaker's efficiency from 88dB to 92dB, just enough to liberate the potential of my 11 watt amps.

I just recently took the Marchand out of my system. After a couple of years internal debate--uncomfortable with many of the reported problems with high efficiency speakers--I had the good fortune to run into a pair of Zu Audio Essences that I could take home before buying. I ended up liking them enough to keep, so I'm simplifying my system. My decision was both acoustic and economic. The Zu's are only slightly better than the RBH's in my system, a function of synergy rather than quality of design. I decided to keep the Zu's, in the final instance, because i expect a return on my earlier investment. I can now sell my speakers, my autoformers and the crossover. These sales will pay for my new speakers, and leave me with quite a bit of cash left over.

In any case, I stand behind my earlier statement. I know I needed to actively bi-amp, but I believe that your decision should be based on what kind of sound you want. It may be that you would be better off changing speakers. Perhaps a different amp would do the trick. It would help if you told us what you love about your components and what you believe needs improvement. I would consider bi-amping only if I were certain that I did not want to relinquish either amps or speakers.

Cheers,

Ivan