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

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Description

🎉 Unleash the Beat with JBL's Powerhouse Subwoofer!

DURABLE DESIGN - Built to withstand the rigors of touring with 18mm wooden enclosures and robust steel grilles.
PERFECT PAIRING - Optimize your sound by pairing with JBL SRX812, SRX825, or SRX835 for a complete audio experience.
UNMATCHED POWER - Experience a thunderous 2400W peak output that elevates your sound to concert levels.
VERSATILE SETUP - Easily configure with M10 suspension points and ergonomic handles for seamless transport.
PRECISION ENGINEERING - Crafted with JBL’s Differential Drive Technology for low distortion and extended low frequencies.

The JBL Professional SRX818s is a portable, passive 18-inch subwoofer designed for high-performance audio applications. With a maximum SPL output of 135 dB and a frequency range of 28-150 Hz, this subwoofer delivers powerful bass and exceptional sound quality. Built with durable materials and engineered for easy handling, it’s perfect for musicians, DJs, and various performance venues.

Specifications

Is Electric	Yes
Power Source	Corded Electric
Speaker Maximum Output Power	2400 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Protocol	Wired
Connectivity Technology	XLR
Number Of Circuits	1
Item Weight	78 Pounds
Item Dimensions D x W x H	22.6"D x 26.9"W x 26.9"H
Unit Count	1.0 Count
Impedance	8 Ohm
Number of Audio Channels	2.0
Compatible with Vehicle Type	Car
Compatible Devices	Amplifier
Speaker Size	18 Inches
Woofer Diameter	18 Inches
Specific Uses For Product	Musicians, bands, and DJs; concert use; public speaking; performance venues, corporate spaces, educational facilities, and houses of worship
Controller Type	Remote Control
Color	Black
Is Waterproof	FALSE
Warranty Type	Limited Warranty
Control Method	App
Mounting Type	Floor Standing
Material Type	Engineered Wood
Speaker Type	Passive Subwoofer
Additional Features	Portable
Recommended Uses For Product	For Surround Sound Systems
Subwoofer Diameter	18 Inches

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