Can I use these with a StagePAS 400i portable sound system from Yamaha . I want to use them as a vocal monitor.

They are a powered monitor system with left and right RCA inputs and a single mini stereo input and a 1/4" mic input in the front. Basically a mini PA system. They are fairly loud and have a very good sound quality. There are treble,bass and volume attenuators. I use them for a recording studio and they work great with MP3 players. Hope this helps! My guess is they would be loud enough for a personal monitor.

what is the exaxt dimensions of the speaket?

Per the specifications right on the page: Product Dimensions: 15.4 x 7.2 x 11.3 inches ; 10.8 pounds

Are these magnetically shielded?

From using them, they are but I wouldn't say they are too great nor bad at all though.

Will these speakers work as amplifier for entry level electronic drum set?

Yes, they each have an 8 watt amplifier and the sound is excellent. They should work out fine for studio work, but wouldn't have enough power for performance situations with a live band.

Is Electric	Yes
Power Source	Corded Electric
Speaker Maximum Output Power	16 Watts
Connectivity Protocol	RCA
Connectivity Technology	RCA Jacks
Item Weight	9.8 Pounds
Item Dimensions D x W x H	5.51"D x 5.91"W x 9.49"H
Unit Count	2.0 Count
Number of Audio Channels	2.0
Compatible Devices	MP3 Player, Laptop, Desktop
Speaker Size	24.1 Centimeters
Woofer Diameter	4 Inches
Tweeter Diameter	1.5 Inches
MP3 player	No
Controller Type	Corded Electric
Color	Black
Is Waterproof	FALSE
Warranty Type	Limited Warranty
Audio Output Mode	Stereo
Mounting Type	Tabletop Mount
Speaker Type	2-Way Active Nearfield Monitors
Additional Features	Built in microphone
Recommended Uses For Product	For Computers
Subwoofer Diameter	4 Inches

MS16

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