How do these compare to the NS-555s? I need to replace my floor standing 555s with equal-or-better wall-mounted bookshelf speakers.

I have the 777's as my main front L/R and the 333's as my 4 surrounds. The 333's are less responsive in the low end then my 777's (as expected) but if you have a sub to fill in then I wouldn't be concerned with a theater environment. Overall I am very satisfied with the performance of the 333's and am considering getting more for my office stereo (the low end response is sufficient for music). They are not a small speaker (check dimensions) but if you have the right wall bracket (or shelf as I have) they are great.

What is the frequency respond of those speakers?

Manufacturer's Specifications: http://usa.yamaha.com/products/audio-visual/speaker-systems/home-speaker-systems/ns-333/Frequency Response: 65 Hz - 35 kHzImpedance: 6 OhmsInput Power (Max/Normal): 150W / 60W

Do these have mounting brackets or receptive screw in mounts on back? thanks

It has a pre-drilled, single-holed bracket to mount on a wall. I would recommend to place a thick felt or rubber/silicone feet to the backside or bottoms of the speakers, so not to scratch wall or mar piano finish to bottom of speakers. These NS Series (333s, 444s, 555s, and 777s) are a fantastic deal considering the realistic sound which these speakers reproduce. All my speakers in these series (excluding the larger 777s), require time to be broken in. Mine took half a year of very infrequent music and movie watching via A/V system. You will discern a big difference of the sound once they are broken in. I knew it when as I was listening to a movie's intro. The sound was very room-encompassing. Enjoy the quality of Yamaha NS speakers and the elegant glossy finish.

What cable would be the best for connecting these speakers to my Yamaha receiver? What AWG would I need for the best possible quality sound?

Although not necessary for this speakers or home use, try to get the lowest AWG cable and as short as possible. Cable acts as a resistor between the amp and the speakers, so the more AWG the thinner the cable. Think a cable as a water hose, the longer the water the heavier is push out the water and the thinner the water hose, more difficult to pass water.

ASIN	B0000W4U1S
Additional Features	Built In Microphone
Age Range Description	Adult
Antenna Location	Music
Audio Driver Size	5 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Brand	ヤマハ(YAMAHA)
Built-In Media	5" PMD corn woofer, 1" aluminum dome tweeter and monster cable internal wiring
Color	Black
Compatible Devices	Home Theater
Connectivity Protocol	Bluetooth
Connectivity Technology	wired
Control Method	App
Controller Type	Corded electrical
Customer Package Type	Standard Packaging
Customer Reviews	4.5 out of 5 stars 124 Your Review
Enclosure Material	Aluminum
Global Trade Identification Number	00027108916781
Impedance	6 Ohms
Is Waterproof	False
Item Dimensions D x W x H	29.8D x 50.2W x 40.6H cm
Item Height	12 inches
Item Weight	25.7 Pounds
MP3 player	No
Manufacturer	Yamaha
Material	Aluminum
Model Name	NS-333
Model Number	NS-333
Mounting Type	Shelf Mount
Number Of Circuits	2
Number of Audio Channels	2.0
Number of Items	1
Number of Power Levels	2
Power Source	AC
Speaker Maximum Output Power	120 Watts
Speaker Size	5 Inches
Speaker Type	Bookshelf
Specific Uses For Product	Home Theater Music
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	5 Inches
Tweeter Diameter	1 Inches
UPC	027108916781
Warranty Type	Extended
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	5 Inches

YAMAHA NS-333 2ウェイバスレフブックシェルフスピーカー(ペア)ブラック

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