I have two pair on my Joseph Audio speakers with Bybee devices (2 pair in each speaker) built in.
This combination along with Bybee devices in the electronics have been completely transforming as they are with Bob Levi's systems as described in his Speaker Match review in Positive Feedback wherein he posed the question "Are Speaker Match Devices audio's Holly Grail?" I also have Synergistic Research Speaker Cells which restore dynamics and provide amazing "slam" for both micro and macro dynamics that bring startling reality to the sound of instruments and voices.
This combination along with Bybee devices in the electronics have been completely transforming as they are with Bob Levi's systems as described in his Speaker Match review in Positive Feedback wherein he posed the question "Are Speaker Match Devices audio's Holly Grail?" I also have Synergistic Research Speaker Cells which restore dynamics and provide amazing "slam" for both micro and macro dynamics that bring startling reality to the sound of instruments and voices.