Is there a noticeable difference in sound between NSIC600WH vs NSIC800WH?

As an audio engineer, I can personally tell the difference between the two models. However, to the untrained ear of a casual listener it will be very difficult to notice any difference. This will also differ from person to person as every set of ears and every human brain are just a little bit different. Therefore not every human being is capable of hearing all of the frequencies being omitted from the speakers. That being said, the difference between models is their frequency range. Ask yourself these questions before making a decision :1) Do you commonly notice a difference in the overall sound quality when listening to music on different speakers? 2) Does your listening pleasure diminish when you notice these differences? 3) Are you the kind of person that doesn't mind spending a little more money if you know that you will be getting a better quality product? If you answered yes to these questions, then I would recommend doing as I did and purchasing the 800 model. BTW, if you're "all about that bass" the 800 will also be more appealing as the main difference is the low end frequencies as they always improve with size. I hope this was helpful! Matt. W.

Can these speakers be used as inceilling dolby atmos?

Yes but you wouldn't be wanting this 8" woofer model as ceiling speakers for atmos will be doing atmospherics only, meaning highs mostly. 8" speakers are best at lows. So drop to 6" or lower for better atmos sound (and save money)

ASIN	B0046RE02W
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#13,537 in Electronics ( See Top 100 in Electronics ) #7 in Ceiling & In-Wall Speakers
Color	White
Compatible Devices	Desktop, Projector, Smartphone, Streaming Device, Television
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.7 4.7 out of 5 stars (1,046)
Date First Available	October 20, 2010
Global Trade Identification Number	00027108937823
Impedance	8 Ohms
Included Components	Quick Start Guide
Is Discontinued By Manufacturer	No
Is Waterproof	False
Item Weight	4.2 pounds
Item model number	NS-IC800WH
Manufacturer	Yamaha Electronics
Material	Polypropylene
Maximum Range	10 Meters
Model Name	NSIC800WH
Mounting Type	Ceiling; Wall-Mount
Number Of Circuits	2
Number of Items	1
Power Source	Corded Electric
Product Dimensions	4.5"D x 4.5"W x 10.75"H
Recommended Uses For Product	For Computers, For Music Players, For Smartphones or Tablets, For Surround Sound Systems, For Televisions
Set Name	Pair
Shape	Round
Signal-to-Noise Ratio	85 dB
Speaker Size	8 Inches
Speaker Type	In Ceiling
Special Feature	Flush Mount
Specific Uses For Product	Home Theatre, Party, Pro Audio
Style	2 Speakers
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	8 Inches
Surround Sound Channel Configuration	2.0
UPC	700115640107 027108937823
Unit Count	1.0 Count
Warranty Type	Limited
Water Resistance Level	Waterproof
Woofer Diameter	8 Inches

NSIC800WH 140-Watts 2-Way RMS Speaker - White (2 Speakers)

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