Hi Mr. Nabisco and Uncle Old Duke!!!
Good to read your posts again Old Duke! I guess you were on holiday some weeks ago?

(from http://new.volvocars.com/ownersdocs/1994/1994_940/94940_1_1.html)
For the single DIN-height slot in the 1994 940 center console, your radio options are limited. Are you replacing the factory CR-712 or CR-814 or another aftermarket?
I've had some luck with junkyard radios. Though the made in 2000 CDX-S2000 in my 1991 240 shows it's age in the CD-player. Used wire harness adapter kits from Crutchfield or eBay, removing the head unit and amp, yet used the power and speaker wire harness. The Volvo wiring in 1991+ is is way better quality than what you get for aftermarket installs. I also replaced the 1991 factory Dynaudio speakers with new.
The CD player 1997 Sony CDX-4160 in my 1992 has failed (again) and delivers fault code E-04 and I'm bored with removing it and attempting repair again. The audio is better, if not as loud, than the CD-S2000. The thing had some speakers replaced on the door and the factory holes in the hat shelf. So, some junkyard speakers work fine with the radio today. Though FM and AM serve up garbage broadcast content, usually, as available in arches and baseball cardinals city-hole.
Other radios and installs works fine and the displays were dim and not so animated as those made for the ADHD generation.
You'll want the mounting cage if the auto radio manufacturer uses it with the replacement model, a bezel behind the faceplate that sit in the dash. You may have other issues to secure it in the 940 center console single-DIN radio slot. Use adapters to secure to the radio plug and make it plug and play with the Volvo radio power and speaker wire harness. The factory radio may have powered the dash tweeter / mid range speaker assembly on the dash. The DIN cable to the remote AMP powers the speakers in the doors. The dash mount tweeter / midrange assembly improves stereo imaging as it reflect off the windshield interior.
You may want to try craigslist and eBay for brand models that do not light up the interior. I'm unsure when these bright and gauche auto radio displays became the sole option. Yet also these radio may provide digital radio reception (for what that is worth) and the ability to play USB drive audio files, negating the CD player need. Though a CD player that can play audio files like higher bit rate mp3, aac, ogg, or other may be useful. You may need to inspect or somehow clean the used radio for dust.
You may want to ask a car audio dealer including Crutchfield what they have that gives you the playing options you want without the sodium halide animated bright display.
With a new powered head unit, with power audio going to the four door speakers ... probably no need to connect the dash speakers. Though better door speakers help if you have the not so good when new Dynaudio speakers installed by the factory. Secure the speakers to the door to seal the front and rear of the speaker and secure the speaker to the inner door card using the same clips as factory, or better clips. The Dynaudio speakers had a oblong speaker bolt pattern. The speaker hole in the 940 door is round and get as big a 2-3 way speaker as you can to fit for resonance.
I found Sony to be okay. Though other brands and models recommended by your brickboard compatriots here may be better.
Hope that helps yoooooooooooooooooo.
Unemployed MacDuffed wondering where the roof over my head goes soon.
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