Can I run a subwoofer off this one

Don't understand the question. This is a subwoofer. If you mean can you connect it to another, I don't think so, but that's a question for the vendor.

If you connect with RCA cable, is wi-fi connection necessary?

It isn't connected that way. It uses an RCA to 3.5mm cable to connect the subwoofer to the main speakers. After that, if your main speakers are multi-hookup type, then you can attach your playing device to your main speakers. Keep in mind, the subwoofer is only a sub, it has to slave off the master speakers. Wi-Fi only involves your player device and main speakers.

Will this work with a bose soundbar?

It depends on what kind of Bose sound bar you have. If it’s a newer genre Bose it will not work with it. Look on the Bose website to see subwoofer capabilities.

can i use this sub for karaoke amplifier that can also play music

Thanks for your question. Pls send the ports‘ photo of your amplifier to support@bestisan.com. We'll have a check and give you a reply.

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BESTISAN 6.5’’ Subwoofer, Powered Home Audio Sub woofer with Deep Bass in Compact Design, for Studio and Home Theater, Black,SW65C

BESTISAN 6.5’’ Subwoofer, Powered Home Audio Sub woofer with Deep Bass in Compact Design, for Studio and Home Theater, Black,SW65C

Product ID: 366695452

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Details

Brand
BESTISAN
Speaker Maximum Output Power
400 Watts
Frequency Response
35200 Hz
Connectivity Technology
Auxiliary RCA
Audio Output Mode
Stereo

📏Compact 9.3x9.3x13 inch design

🔊400W max output power

🎚️Independent bass & volume controls

Description

🎶 Compact Powerhouse: Feel Every Beat, Own Every Room

PRECISION BASS CONTROL - Separate knobs for bass level and master volume let you tailor the low-end impact perfectly.
SEAMLESS COMPATIBILITY - LFE & line inputs ensure plug-and-play with most receivers, soundbars, and bookshelf speakers.
SLEEK SPACE SAVVY DESIGN - At just 10.5 lbs and under 13 inches tall, it fits effortlessly into any home theater or studio setup.
ROOM SHAKING BASS IN A COMPACT FRAME - 6.5’’ downward-firing woofer delivers deep, immersive bass without hogging your space.
POWERFUL PERFORMANCE MINIMAL FOOTPRINT - 400 watts of wired power output for rich, room-filling sound that commands attention.

The BESTISAN 6.5’’ Powered Subwoofer packs a punch with 400 watts of wired power, a downward-firing 6.5-inch driver for enhanced bass extension, and user-friendly controls for bass and volume. Its compact 9.3x9.3x13 inch footprint fits seamlessly into small to mid-sized rooms, making it ideal for home theaters and studios seeking deep, precise low frequencies without sacrificing space.

Specifications

Is Electric	No
Power Source	Corded Electric
Speaker Maximum Output Power	400 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Technology	RCA, Auxiliary
Audio Driver Size	6.5 Inches
Item Weight	10.5 Pounds
Item Dimensions D x W x H	9.3"D x 9.3"W x 13"H
Frequency Response	35200 Hz
Compatible with Vehicle Type	Car
Compatible Devices	Television
Speaker Size	6.5 Inches
Woofer Diameter	6.5 Inches
Water Resistance Level	Not Water Resistant
MP3 player	No
Specific Uses For Product	home theater setup, watching movies, and listening to music
Controller Type	Corded electric
Color	Black
Is Waterproof	FALSE
Warranty Type	Limited
Control Method	Remote
Audio Output Mode	Stereo
Mounting Type	Shelf Mount
Speaker Type	Subwoofer, Bookshelf, Woofer
Additional Features	bass_boost
Recommended Uses For Product	For Surround Sound Systems, For Televisions
Subwoofer Diameter	10 Inches