Do Mono Block amps provide better sound ??

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.

So I got a second AHB2 and switched to mono mode on both AHB2

Amps that are bridged are not true monoblocks, bridged stereo amps grated get the better single channel power supply I mentioned above and have more wattage than when they were stereo, but all other measured parameters take a hit with bridged amps. I’d far prefer true monoblock amps.
I think the better way with the 3.7’s would have been to keep the AHB2 as stereo on the bass, and have something like a Class-A Schiit Aegir on the mids and highs, no bridging involved then.

Cheers George

I run both a stereo amp and mono blocks, not at the same time. The stereo amp is excellent and offers the following advantages...a single amp stand, a single power cord and the ability to hook up one subwoofer with no issues. It also takes up less space ( slightly). The mono blocks offer these advantages ( and they have mostly already been mentioned): better separation between instruments and slightly more depth, all of the attributes that Ralph pointed out above and greater flexibility of placement. For ultimate SQ--I think it is mono blocks, for less expense, it is the stereo amp.