In my case it was a huge improvement. My Thiel CS3.7 require a lot of power. I had a single Benchmark AHB2 in stereo and it provided around 250+ at 2 Ohm. It sounded under-powered. So I got a second AHB2 and switched to mono mode on both AHB2's to give around 500 at 2 Ohm range (though not officially rated for that). The sound improvement was easy to hear. More bass, more power in my hard rock music, just better.
I was also able to buy a real amazing, but expensive speaker wire, using the mono's because I could keep the amps right beside the speakers and use a lower cost length. I use 15 foot XLR interconnects that are not as important as the speaker wire. The XLR's cost about $200. So the monos made the speaker wire more affordable for me.
I was also able to buy a real amazing, but expensive speaker wire, using the mono's because I could keep the amps right beside the speakers and use a lower cost length. I use 15 foot XLR interconnects that are not as important as the speaker wire. The XLR's cost about $200. So the monos made the speaker wire more affordable for me.