Bi amp pros out there I could use some help! First time Bi Amping...

Hi, Im about to take delivery of a set of floorstander speakers that do have a separated passive crossover with a pair of speaker connecting posts for the mid/treble, and for bass as do many modern speakers. Fortunately I have four mono Musical Fidelity mosfet amps, a bit old yes, but all 50 watt.
The simple reasoning that supports biamping in this case is that the mono amp supplying the mid/treble speakers will have considerably less load drawn from it during heavy bass passages of music.
There is no doubt that an active crossover system would be best of all as that same mono amp would only have to amplify a given range of frequencies.
However as I firmly believe that this new speaker set has been designed by engineers etc with infinitely better experience and measuring equipment than I have, the best option that I have is to maximize their design by biamping them.

I will leave a report on the differences I find between single and biamp on  this discussion in a couple of weeks. I have many years listening experience, so it should be relevant. So if you would like to know, then click the `Follow this discussion` at the top!

To the naysayers: biamping is definitely advantageous with the separation of reactive energy from the woofers from the mid/high drivers. You will experience cleaner midrange and treble if you use amplifiers rated with enough power to stand on their own in non-biamp configuration. I recently upgraded my amps, quadrupling the available power to drive the same speakers, and the difference is very noticeable. 

Next stop: experimenting with subwoofer swarms. 

Thank you all for the detailed responses! It means a lot to a guy like me, or just me. Take care and Happy early Memorial Day weekend to any Vets.

-Allgood 

PS I didnt add that I have two Hsu Research ULS 15 sealed subs that I am running stereo via speaker level from the Dunlays but no high pass just for the foundation. Was thinking of adding a third to try and get that swarm effect.Thank all of you!

Looking at some rear panel photos of the Hsu ULS-15 it appears that it may have a two-prong IEC receptacle for its power cord. If so I don’t see any issues regarding the presence of the subs in the system.

However if they have a three-prong receptacle, and a three-prong power plug, I would suggest that you connect their speaker-level inputs to either the output terminals of the Pass amp or to the mid/hi terminals of the Dunlavys. Connecting the negative speaker-level input terminal of a powered sub that has an AC safety ground connection to the negative output terminal of a fully balanced amp (such as the BAT), which as a fully balanced amp has a full amplitude signal on that terminal, may cause problems and conceivably even damage depending on the impedance through which circuit ground and AC safety ground are interconnected within the particular amp and sub. And of course that would also apply if the connection is made to a speaker terminal to which the negative output terminal of the balanced amp is connected.

In the biamp configuration you have described the Pass amp won’t be supplying a great deal of current or power at bass frequencies, of course, but since it will be approximately gain matched with the BAT amp the subs will receive essentially the same full-range signal voltage and hence similar bass information regardless of which amp they are connected to.

Regards,

-- Al