I wouldn't worry about 4 ohms with the Triads. The way speakers are rated is different and in reality speakers vary their ohms depending on frequency. So one manufacturer's 4 ohms speaker might be the lowest it goes at a given frequency while another manufacturer it might be the average. We have Triad Bronze/ sIlver speaker system and have powered it with a variety of receivers over the past 9 years without a problem. Unless you have a very low end receiver you won't have a problem powering the Triads. Without an impedance graph along with sensitivity ratings (another measurement manufacturers don't measure the same way) it would be tough to tell which speakers are harder to drive.
Here are some reviews of the GoldenEar, it is tough to find measurements for in ceiling speakers. We have measured Triad in ceiling LCRs and they measure well for frequency response and are decent off axis.
Frequency response is not impressive but not terrible either. Off axis is not great but to be expected with a sound bar with a horizontal midrange-tweeter-midrange design. The impedance graph shows it dips slightly below 4 ohms range at certain frequency ranges. I'm not sure why the center speaker measures differently but I'm guessing the volume of the cabinet is different between the L/R speakers or maybe a different crossover. They would rate it 5 ohms but GoldenEar states compatible with 8 ohms systems. So the moral is don't go by impedance (ohm) ratings of speaker manufacturers. In fact a well respected industry professional once told us in a class is the only specs he trusts from a manufacturer are size and weight:-)