First of all, while that is a nice toy, do you really need it to test your CCM683 that you already know it's specified minimum impedance is 4.5 Ohm? By the way, is that speaker easily accessible. If it is, did you remove it to have a careful to say if there are signs of burn mark(s). If I understood right you heard a pop from that speaker right? That pop could have been due to a short at the speaker end or as TLS mentioned, caused by the output transistor when it blew.
If your top left (the suspect) measured approximately 4.5 ohm and exactly the same as the top right, then it is safe to power them up to compare their freq response next for further assessment. If you haven't use REW yet, it is easy, and is a freeware, though you do need to buy a mic.
So it they measure the same 4.5 ohm, again that's just the woofer resistance, and the FR looks the same, then your speaker is fine. I can't see a damage tweeter and/or woofer would produce the same FR as an undamaged one. Using REW you can crank up the volume to get say 85 dB output or even higher if you want to make sure the speaker works well at higher output levels.
Before you do the REW measurements though, I would still use a cheap speaker, even one without enclosure to verify the amp first and then power up with volume already set to minimum.
Then when you measure the suspected speaker, use a brand new pair of wire just to be sure the existing wire may be the problem, i.e. having some mysterious intermittent "short" for whatever reason.
Now back to the DATS V3 that is apparently on sale for $129. You should be able to run it on your Mac using bootcamp to dual boot it. That's what I have done with my Mac and it has been flawless, no issue with updates to the most current version 1909.
If you have not looked into it before, check it out following the link:
Learn how to install Windows 10 on your Mac with Boot Camp.
support.apple.com