This is listed as a speaker system. How many speakers are included?

One speaker only. You may consider it a system as they are active. They have a Class D amplifier and a DSP built in.

Can I use this for my home stereo, in 14’ by 25’ living room

This is designed more for a 140' by 250' living room.... I'm guessing that, if you have 2 grand to spend on a sub, and have to ask this question... Return the stolen money.

I am planning to buy a sound system for 1000 people venues or a little more mostly out door. What would you guys recomend me tu buy and quantities?

Buy 4 of these, 2 per side and 2 or 4 subs. I would say 4 subs.

What cables (short) are needed connect my phone's audio out to srx835p? should modify anything when providing unbalanced mono input from phone?

First I will say the speakers are killer and destroy they can go so loud perfect for my outside venue. I run mine off of a mixer board (they are not expensive) so I have a Blootooth reciever into the board going into the speakers. I have not tried it but on other speakers like this I simply used a 3.5mm output from my phone with a 3.5mm TRS to two 6.35 mm TRS plugs that go into the speakers. search for example on amazon "UGREEN 3.5mm 1/8" TRS to Dual 6.35mm 1/4" TS Mono Stereo Y-Cable Splitter Cord Compatible for iPhone, iPod, Computer Sound Cards, CD Players, Multimedia Speakers and Home Stereo Systems 15FT" You could also buy a bluetooth reciever/transmitter and plug the 3.5mm into that so you can walk around with your phone and play tunes that way. For example something like this again on amazon (there are many) APEKX Clip Bluetooth Audio Adapter for Headphones, Headset, Speaker, Wireless Receiver with MIC for Hands-Free Call and Music

ASIN	B013JKHT2O
Colour	Black
Compatible devices	Professional audio equipment (mixer, amplifier, etc.)
Control method	App
Country of origin	Mexico
Impedance	8 Ohms
Included components	[Subwoofer]
Is waterproof	False
Item model number	SRX818S
Item weight	78 Pounds
Manufacturer	JBL
Material	Engineered Wood
Model name	SRX835
Mounting type	Floor Standing
Number of Items	1
Power source	Corded Electric
Product dimensions	57.4D x 68.3W x 68.3H centimeters
Recommended uses for product	For Music Players, For Smartphones or Tablets
Speaker size	18 Inches
Speaker type	Passive Subwoofer
Special features	Bass Boost, Hi Res Audio, USB Port
Subwoofer diameter	18 Inches
Surround sound channel configuration	1.0
Unit count	1 Count
Wireless communication technologies	No Wireless Communication Technology

Jbl Srx818S Professional Passive Subwoofer System, Single, Black (Pack Of 1)

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