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.

Mounting type	Tabletop
Material	aluminum
Model name	B212D
Speaker type	PA Speaker
Special features	Class-D Amplifier Technology
Recommended uses for product	For Surround Sound Systems
Compatible devices	Laptop, Tablet, Smartphone
Subwoofer diameter	12 Inches
Controller type	App Control
Surround sound channel configuration	2
Colour	red
Battery life	1 days
Included components	NO
Age range (description)	Adult
Item weight	14500 Grams
Is waterproof	false
Item Weight	14.5 Kilograms
Product Dimensions	26.92 x 34.54 x 55.12 cm; 14.5 kg
Item model number	B212D
Color Name	red
Speaker Amplification Type	Active
Material Type	aluminum
Speaker Count	1
Output Wattage	450 Watts
Power Source	Corded Electric
Voltage	240 Volts
Wattage	450 watts

B212D 2-Way Active Loud Speaker - Black

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