Do new iMac desktops have built-in speakers without perforations?

Yes, all iMacs have built in speakers. Even the Mac mini has a built in speaker.

Please read the Tech Specs for your iMac. The most current iMacs are 2024 models and the following link has all the Tech Specs that Apple publishes.

iMac (24-inch, 2024, Four ports) - Tech Specs - Apple Support , in that link it includes audio information which states:

• High-fidelity six-speaker system with force-cancelling woofers
• Wide stereo sound
• Support for Spatial Audio when playing music or video with Dolby Atmos
• Studio-quality three-mic array with high signal-to-noise ratio and directional beamforming
• Support for “Hey Siri” or just “Siri”

Look closely at the bottom edge of the iMac. You'll find that it's perforated. The speakers fire down toward the desktop.

Yes, it has built-in speakers. But the speakers don't have perforations. The case has perforations so you can hear the speakers. The sound is awesome.

Absolutely, and in their categories, they are light years ahead of anything on the market.

(This is honestly not an opinion, but a fact.)

Apple speakers in general deliver a shockingly full, balanced and loud audio experience.

And yes, they do have perforations, as other users have already mentioned.

You can look at a teardown site to see an xray of where the speakers are.