Does this require two connections? One rca from the unit to the sub out connection on headunit. And one to battery?

Yes, it needs 12v power, you need the audio connection from the head unit ( RCA/sub out ) permanent live to the battery and earth to the chassis or battery, then the remote wire to the head unit which tells the sub to turn on and off, all aftermarket head units have a remote live connection for this purpose 👍

Can i use it in my home system? I have a musical fidelity amp and Linn speakers

Yes, however you would need a 12V transformer with 20amps current supply.

how do you turn off if connected straight to battery?

It detects the audio signal and turns itself on and off when you turn your head unit on/off. It's clever like that :-)

Can I wire to cigarette lighter for power? Says max 120w

You cannot. You need to wire the active subwoofer directly for power to the battery Positive. If you are unsure how to do this, many videos on Youtube. It also explains in the instructions. However we always recommend professional installation if you are not sure.

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In Phase USW300 300W Underseat Subwoofer - Active Car Subwoofer with Built-in Amplifier

In Phase USW300 300W Underseat Subwoofer - Active Car Subwoofer with Built-in Amplifier

Product ID: 698387382

Details

Audio output mode
Stereo
Brand
In Phase
Connectivity technology
Auxiliary
Frequency response
150 Hz
Input voltage
12 Volts
Material
Aluminum/Die

📏Compact 16cm width

🔊300W max power

⚙️Die-cast aluminum chassis

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€ 214.11

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Description

🎶 Elevate your drive with bass that commands attention!

POWERFUL 300 W OUTPUT - Feel every beat with a max output that transforms your car audio experience.
HEAVY DUTY METAL BUILD - Die-cast aluminum chassis delivers durability and vibration-free performance.
DISCREET UNDERSEAT DESIGN - Fits seamlessly under seats or in tight spaces without sacrificing sound quality.
RATTLE FREE ALUMINIUM CONE - Lightweight yet robust cone design ensures deep, distortion-free bass.
REMOTE CONTROL CONVENIENCE - Fine-tune your bass on the fly with an easy-access remote, no more awkward adjustments.

The In Phase USW300 is a compact, active underseat subwoofer delivering up to 300W max power through a robust die-cast aluminum chassis and lightweight aluminium cone. Designed for easy installation in tight vehicle spaces, it offers rattle-free deep bass and remote control tuning, making it a premium choice for audiophiles seeking powerful, discreet car audio enhancement.

Specifications

ASIN	B089GZ6F14
Age Range Description	Adult
Antenna Location	Car
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Box Contents	Car Subwoofer Active Enclosure, Wiring Kit, Mounting Brackets, Remote Controller, Instruction Manual
Brand Name	In Phase
Colour	USW300
Compatible Devices	Desktop
Compatible with Vehicle Type	Car
Connectivity Protocol	Auxiliary
Control Method	Remote
Controller Type	Remote Control
Country of Origin	China
Customer Package Type	Standard packaging
Customer Reviews	4.4 4.4 out of 5 stars (553)
EU Spare Part Availability Duration	2 Years
Enclosure Material	Aluminum/Die Cast Aluminum
Frequency Response	150 Hz
Global Trade Identification Number	05060047672757
Input Voltage	12 Volts
Is Waterproof	false
Item Dimensions D x W x H	5D x 16W x 5H centimetres
Item Type Name	Underseat Active Subwoofer
Item Weight	1.5 Kilograms
MP3 player	No
Manufacturer	In Phase
Maximum Speaker Output Power (in watts)	300 Watts
Model Name	USW300
Model Number	USW300
Mounting Type	Underseat Mount
Network Connectivity Technology	Auxiliary
Number of Audio Channels	2.0
Number of Items	1
Power Source	Corded Electric
Product Features	Built-in Amplifier, Aluminium Coned Subwoofer
Speaker Size	28 Centimetres
Speaker Type	Subwoofer
Specific Uses For Product	Car
Subwoofer Connectivity Technology	Wired
Tweeter Diameter	1 Inches
Warranty Type	Limited
Wireless Technology Type	No Wireless Communication Technology
Woofer Driver Diameter	200 Millimetres

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 214.11

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

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TrustScore 4.5 | 7,300+ reviews

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