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

🎶 Feel the bass, own the stage with JBL SRX828S!

SEAMLESS INTEGRATION - M20 pole cup and indexing feet enable flexible setups with JBL SRX series for perfect sound coverage.
ERGONOMIC PORTABILITY - Designed handles and manageable weight make transport and setup a breeze for busy professionals.
TOUR READY DURABILITY - Built with 18mm wood, steel grilles, and DuraFlex finish to withstand the rigors of heavy use.
PRECISION AUDIO CONTROL - Compatible with Audio Architect app for effortless tuning and customization on the fly.
UNMATCHED LOW END POWER - Dual 18-inch woofers deliver thunderous bass that commands attention in any venue.

The JBL SRX828S is a professional-grade passive subwoofer featuring dual 18-inch drivers, delivering up to 141 dB SPL and handling peak power of 4800W. Engineered for touring and installed sound, it boasts a rugged 18mm wooden enclosure with steel grilles and JBL’s patented DuraFlex finish for ultimate durability. Designed for easy integration with JBL SRX speaker systems and controlled via the Audio Architect app, it offers powerful, precise low-frequency performance ideal for concerts, corporate events, and large venues.

Specifications

Model Name	SRX828S
Speaker Type	Passive Subwoofer
Special Feature	Portable
Recommended Uses For Product	public
Compatible Devices	Amplifier
Subwoofer Diameter	18 Inches
Net Quantity	1.0 count
Surround Sound Channel Configuration	2.0
Colour	Black
Product Dimensions	57.4D x 120.4W x 68.1H Centimeters
Item Weight	62.14 kg
Is Waterproof	False
Number of Items	1
Control Method	App
Speaker Size	18 Inches
Power Source	Corded Electric
Brand Name	JBL
Colour Name	Black
Audio sensitivity	141 Decibels
Signal-to-Noise Ratio (db)	141 dB
Item model number	SRX828S
Manufacturer	JBL Professional
Item Weight	62 kg 100 g

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