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

Jbl Professional Srx818s Portable Passive Non Powered Subwoofer System Single

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Description

🎶 Own the low end, dominate the room.

PRO LEVEL CONTROL - Full Audio Architect support for custom tuning and remote management—own your sound.
SEAMLESS INTEGRATION - M20 pole cup and indexing feet for effortless stacking and perfect sound alignment.
ROCK SOLID DURABILITY - Built with 18mm wood and steel grilles to withstand the rigors of touring and heavy use.
MASSIVE 18 WOOFER POWER - Feel every beat with precision and depth that commands attention.
UNMATCHED 2400 W PEAK OUTPUT - Deliver earth-shaking bass that fills any venue, from corporate halls to concert stages.

The JBL Professional SRX818S is a portable, passive 18-inch subwoofer engineered for professional use in concerts, corporate events, and venues. With 2400W peak power, a frequency range down to 28Hz, and a rugged 18mm wooden enclosure, it delivers powerful, precise bass with durability and easy integration for superior sound performance.

Specifications

ASIN	B013JKHT2O
Additional Features	Portable
Age Range Description	Adult
Antenna Location	For Surround Sound Systems
Audio Driver Size	18 inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#59,941 in Musical Instruments ( See Top 100 in Musical Instruments ) #186 in Stage Subwoofers #20,439 in Music Recording Equipment
Brand	JBL
Built-In Media	[Subwoofer]
Color	Black
Compatible Devices	Amplifier
Compatible with Vehicle Type	Car
Connectivity Protocol	Wired
Connectivity Technology	XLR
Control Method	App
Controller Type	Remote Control
Customer Reviews	5.0 5.0 out of 5 stars (2)
Enclosure Material	Stainless Steel
Frequency Response	45 hertz
Global Trade Identification Number	00691991001659
Impedance	8 ohm
Is Waterproof	FALSE
Item Dimensions D x W x H	22.6"D x 26.9"W x 26.9"H
Item Type Name	JBL SRX818s 18" Passive Subwoofer System Black
Item Weight	78 pounds
Manufacturer	JBL
Model Name	SRX835
Model Number	SRX818S
Mounting Type	Floor Standing
Number Of Circuits	1
Number of Audio Channels	2
Number of Items	1
Number of Power Levels	2
Power Source	Corded Electric
Series Number	818
Signal-to-Noise Ratio	135 db
Speaker Maximum Output Power	2400 watts
Speaker Size	18 inches
Speaker Type	Passive Subwoofer
Specific Uses For Product	Musicians, bands, and DJs; concert use; public speaking; performance venues, corporate spaces, educational facilities, and houses of worship
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	18 inches
UPC	691991001659
Unit Count	1 Count
Warranty Description	This product is sold by an authorized jbl professional north american dealer and includes the official jbl professional manufacturer’s warranty. The warranty is valid only for products purchased from authorized sellers within the united states. Full details are available on the jbl professional website.
Warranty Type	Limited Warranty
Wireless Technology	No Wireless Communication Technology
Woofer Diameter	18 inches

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