Yeah, don't name names about who you work for.
I'm generally sceptical of online customer reviews. Too often there are bad reviews that are nothing to do with the product. Other times it's the user trying to do something that the gear won't do. I also factor in the keyboard warriors who love to tell a tale of woe. Having said all that, Marantz does seem to be going through a bit of a tough patch right now.
A lot has happened with the brand. The mid-Fi market is weak, and AV is under tremendous pressure with the advent of ATMOS and 4K requiring manufacturers to throw a lot of tech in to ever-cheaper product lines. That's gotta hurt the bottom line. It could be the reason for the Denon/Marantz consolidation, and then the purchase recently by a venture capital group.
Whatever it is - and probably a combination of factors, that's usually the way - Marantz isn't alone, and it won't be the last.
Where you have qualms about a brand or product, and particularly when recommending for someone else, I think you should follow your gut instinct. Doing someone a good turn has a habit biting one on the bum. It does leave you with the problem though of how to control the volumes in two zones individually. It doesn't appear that Marantz offers that facility in anything but the Melody products. I haven't seen Speakers A/B on many mini-systems either.
The closest facility in something reasonably compact is the Zone 2 assignable speaker outputs of the 7.1ch compact AV receiver, the Marantz NR1609. The catch is that Z2 sources are limited to analogue audio, the radio, and maybe internet radio. You wouldn't be using it as a multichannel receiver for Zone 1. Instead, it would be configured for stereo speakers.
Thinking about the ceiling speakers for a minute, parallel wiring will give you a 4 Ohm load unless the speakers have built in impedance switching. The bigger problem though is that the channel is mono. These aren't 100V line speakers, are they? You'd tell this if they had transformers on the back of each speaker.
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