Do you have a link to the speakers datasheet?

Near as I can tell, it’s listed here. I’d think they’d be fine with a Sonos Amp, a bit less so, but still OK with an older Sonos CONNECT:AMP, due to the power differences. 

Thanks for the link.

90 dB is decent efficiency. 

The 25-200 Watts power spec is usually worthless to the user.

The 4 Ohms is good news as it let's the Sonos Amp deliver 250 Watts to it.

Specs:

sensitivity: 90 dB

power handling: 25-200 watts

impedance: 4 ohms

https://support.sonos.com/en-us/article/set-up-your-sonos-amp

Several reports indicate that the impedance dips to 3.5 Ohms. This can fluster CONNECT:AMP. AMP tolerates speakers like this very well.

This may seem a little technical for some viewers, but here is one such speaker report.

Thank you all for responding to my questions.
I am in China, and if I really use the combination of Sonos amp and JBL l100, I will also share my experience here.

I have set up my home theater system and HIFI system. I gave up the traditional home theater system and switched to a soundbar with rear surround sound and subwoofer, model Samsung HW-Q990F. My HIFI system is made using classic speakers (JBL L100 Classic Black Edition), turntable (Technics SL-1200M7L, 50 years anniversary SL-1200 Series), and Sonos amp. At present, both the home theater and HIFI system are working well, and I am very satisfied. Perhaps we will continue to upgrade these systems in the future to improve sound quality.My other vinyl turntable deon DP-400 is currently for sale in the second-hand market.