can you directly plug in an ipod to it with the right aux cord

I run my Android phone to it from the phone's headphone jack. However, as I learned after purchasing the speaker, you cannot run the full (stereo) signal back to the Behringer. This PA is strictly mono, so the cable I use is like this: http://www.amazon.com/Cable-feet-3-5mm-Stereo-Splitter/dp/B0016LFN2C/ref=sr_1_3?ie=UTF8&qid=1384901986&sr=8-3&keywords=stereo+cable+to+rca You will have to also purchase an adapter like this: http://www.amazon.com/Hosa-Cable-GPR101-Inch-Adaptor/dp/B000068O3S/ref=sr_1_1?ie=UTF8&qid=1384902095&sr=8-1&keywords=adapter+rca+to+1+4+inch. There are two there, but since your Behringer only has one input, you'll plug one of the two RCA ends of your cord into the 1/4" adapter, and the adapter into the Behringer. You won't be getting a stereo signal, but with most music, you won't notice it unless you're an audiophile.

is it a necessity to purchase a pair or does one get the job done

Depends on the job. Technically speaking one of these speakers has enough punch to be way more than audible in a medium theater (50'x40' stage, 300 seat house) at about 1/3 volume. I own three of these speakers that I use for my full DJ rig, but if there's some retreat, a beach party, a workshop day, or something that just needs a bit of ambiance music (requires only an iPod and some way to project the track) I'll bring one of these in and adapt 1/8 stereo to 1/4 mono through a DI box and the end result is fantastic. If you're DJ-ing indoor dance floors or something where coverage, volume, and quality are all concerns and your paycheck is one the line, then you'll probably want to go for two speakers to reduce dead-space on the floor.

too much hiss,how can i eliminate the hiss

Make sure all of your equipment is properly connected. Do not use a device that removes the ground on power cords. I had a computer power supply plugged in with a ground eliminating adapter and it created a lot of buzz. I set the volume, treble, and bass all to 12:00 on the speakers.

Can you get a wireless mic to work with this speaker?

Should work with this speaker. Speaker has its own amp, plus volume, high and low adjustments. Performance will probably depend on quality of wireless mic.

Material	Aluminum
Model Name	B212D
Speaker Type	Portable PA Speaker
Special Feature	Subwoofer
Recommended Uses For Product	Compression
Compatible Devices	Desktop, Laptop
Subwoofer Diameter	12 Inches
Net Quantity	1 Count
Surround Sound Channel Configuration	2 1
Colour	Black
Included Components	1 Behringer EUROLIVE B212D Active 550-Watt 2-Way PA Speaker System with 12-inch Woofer and 1.35-inch Compression Driver
Product Dimensions	20D x 20W x 20H Millimeters
Item Weight	14.52 kg
Is Waterproof	False
Number of Items	1
Control Method	App
Wireless Communication Technology	Bluetooth
Speaker Size	12 Inches
Power Source	Corded Electric
Item model number	B212D
Speaker Amplification Type	Active
Speaker Count	1
Audio Wattage	450 Watts
Voltage	240 Volts
Wattage	450 Watts
Item Weight	14 kg 500 g
Manufacturer	Behringer
Country of Origin	China
Imported By	Alphatec Audio Video Pvt Ltd

EUROLIVE B212D Active 550-Watt 2-Way PA Speaker System with 12-inch Woofer and 1.35-inch Compression Driver

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