Bi - Amping

Ensure that the gain on the different amplifiers are the same.

They won't be, and that's what the $49 Schiit Sys passive is for.

Cheers George

lordrootman OP

Halo A21+ on the mids and highs, because it’s "high bias Class A/AB operation" John Curl design, which will be better for the mids and highs.
And probably the Anthem ( Sixteen bipolar output devices per channel ) on the bass for the current in can deliver into 2ohms

And the Rotel Michi having 100ohm output impedance will have no trouble driving any combinations of amps you have

To me if you have the amps, it’s well worth doing as it will cost next to nothing to do and you’ll gain from it.

Cheers George.

Bi - Amping

I want to Bi-amp my speakers with different amplifiers / and diff brands
A21+ Anthem STR amp harman Kardon Signature 1.5 Citation 7.1
what are the consequence or disadvantages of not using the same Amplifiers ?

lordrootman

No problem you can do it with different amps, you will have to do horizontal bi-amping
And need a pair of rca "Y" connector and a passive volume control on the louder of the two amps so you can match the gain/s once set you will not have to touch it. 

Horizontal Bi-Amping https://ibb.co/QpmW5mh

$49 Passive pre.  https://www.schiit.com/products/sys

RCA Y connector  https://www.musicdirect.com/connector-upgrades/audioquest-hard-y-adapter-rca-splitter-1x-male-to-2x-female

 Cheers George

@georgehifi
my preamp is Michi P5
I can run Two amplifier at the same time one on balance XLR and other RCA
I was thinking anthem for LF harman Kardon for HF ?

That’s fine so you won’t need "Y" connectors.But unless you have individual level "set controls" for both outputs and a master on that pre to then raise them both up and down together, your going to need a Sys passive on the louder of the two amps as per my diagram so you can equalize the gains.. https://ibb.co/QpmW5mh

Cheers George