1) is this good enough sound for soprano saxophone solo? 2) how loud is this? can it fill church with 200 people when i do sax solo?

A soprano sax prcatically fills a football stadium by itself. With two hundred people in a dead silent room most people would be annoyed with a soprano sax using any sound reinforcement at all, like a trumpet. A slight amount of reverb/delay with that speaker just barely cracked to 1 would be enough. The range of the soprano sax hits the human ear in its most sensitive area around 1k. It would take at least 15 other classical instruments playing against it to completely drown it out in an ensemble. It is a member of the brass family because of its metal covering making it 3 times louder than a clarinet.

Can I use any brand of USB wireless microphone?

No it cannot. I bought a Samson X1U to use with it and it does not work. I emailed Behringer and here is their response. "The USB port on the MPA40BT-PRO is proprietary and will only work with the BEHRINGER Wireless USB Microphones ... either the ULM100USB or the ULM202USD dual mic system. It will not work with any other brand of USB Wireless Mic. I hope this helps to clarify!"

Is it good for singing in a street performance? if i use a cello do you think the sound it's going to be clear? compared to roland st. cube(not ex)?

If you're putting the cello through it, I would say don't. It's a nice powerful little speaker but the bass roll off is pretty high, cutting out well before I get to my low C string. I've run this with my acoustic cello through a microphone and my electric cello through a pedal board; neither covered the full frequency range of my instrument. If you're using it for vocals or backing tracks it's fine. I've used it to play my accompaniments while I play my acoustic cello and I can play over it just fine and still get the full range I need for either a pre-recorded piano or digital backing track. Actually playing my instrument through it, not so much. If you're looking to do that I would suggest getting a pickup for your cello and running it through small factor mixer with at least a 3 band EQ to a decent speaker set. You really want to control the attenuation to as much of the frequency spectrum as you can. I just ordered a LR Braggs Venue DI specifically to fine tune my electric cello. While the MPA40BT is nice and powerful, it just can't handle the low end of the cello. There just isn't a substitute for quality equipment. I started with this little $200 backpack, for street performing. Now I'm using 2X1500W Mackie's, mixer, and a DI. I like this speaker, just not for my instrument. Voice, pre-recorded tracks both sound excellent. Once you put a Lo-Z line into it, it just doesn't hold up to a good instrument amplifier.

Does this system have an aux port to connect mp3 players?

Yes it does. You must use a Male 3.5mm stereo to stereo RCA cable. Like this - https://www.amazon.com/Cable-iXCC-Shielded-Gold-Plated-Stereo/dp/B019D048XCPlug the RCA ends into the AUX RCA inputs on the unit and use the BT/AUX volume control.

Mounting type	Floor Standing
Power source	Battery Powered
Connector type	Bluetooth
Material	Metal
Item weight	19.73 Pounds
Number of channels	4
Audio input	Microphone inputs (XLR), Bluetooth
Recommended uses for product	For Public Speaking Events, Musical Performances, and Presentations
Frequency response	50 Hz
Manufacturer	Music Tribe
UPC	713757162210
Global Trade Identification Number	00713757162210
Item model number	MPA40BT-PRO
Product Dimensions	30.91 x 24.21 x 42.01 cm; 8.95 kg
ASIN	B00EMDNLKC

MPA40BT-PRO Portable PA System - Black

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