would one of these sound better than 2 motion booms ?

Honestly, no. You should check out Alan Ross reviews on YouTube- he does the exact comparison of what you're asking. 2x booms beat out the boom plus in soundstage and overall sound frequency quality (it's quite close though). Hard to beat the soundstage of two separate speakers. From my personal experience, I'm still so happy with the boom plus in terms of portability and sound (in custom eq mode, I don't really like the soundcore tuning). This speaker is only about 1.5x the size and weight of the motion boom (surprisingly light when you pick it up) and it goes twice as loud. Easier than lugging around two speakers if you go on holiday or to a park or beach or something. But yeah, if you're looking to set up a sound system in the house and not move them about to often then it might be better for you to get two motion booms. (I have one boom and now a boom plus fwiw). Hope that helps!

will this work when plugged into mains power via the usb?

Yes most definitely although I cant imagine the charge wattage will cope with the output power if High volume so you'd be in deficit mode. It does flash the charge power light and then limit volume so it may know how to balance charge wattage versus power output requirements - hope this helps...

is it 80 watts rms or peak?

It didnt say but I doubt its RMS, simply not loud enough and the energy recovery / charge is only via a type C USB so assume peak only.

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soundcore Anker Motion Boom Plus Bluetooth Speaker, Portable Speaker with 80W Booming Sound, IP67 Waterproof and Dustproof, Type-C, Custom EQ, Bluetooth 5.3, Outdoor Speaker For Camping

Product ID: 440606540

Details

Audio output mode
Stereo
Brand
soundcore
Connectivity technology
Bluetooth
Frequency response
20 KHz
Input voltage
5 Volts
Material
SKZZF144

💧IP67 waterproof & dustproof

🔊80W stereo power

🔋20h battery + 13,400mAh power bank

€ 228.33

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Take your sound everywhere — loud, proud, and waterproof!

ALL DAY POWERHOUSE - Massive 13,400mAh battery fuels up to 20 hours of non-stop playtime, plus charges your devices on the go.
EPIC 80 W STEREO SOUND - Two 30W woofers + 10W tweeters deliver booming, crystal-clear audio with BassUp tech for next-level bass.
PORTABLE READY TO ROAM - Lightweight with built-in handle and removable strap—perfect for camping, road trips, and every adventure.
UNSTOPPABLE OUTDOOR COMPANION - IP67-rated waterproof and dustproof design means your soundtrack never stops, rain or shine.
SEAMLESS CONNECTIVITY CONTROL - Bluetooth 5.3 with Soundcore PartyCast syncs unlimited speakers; customize your sound via the intuitive app.

The Anker Motion Boom Plus is a rugged, portable Bluetooth speaker boasting 80W of immersive stereo sound powered by BassUp technology. With IP67 waterproof and dustproof certification, it’s built for outdoor adventures. Its massive 13,400mAh battery delivers up to 20 hours of playtime and doubles as a power bank. Bluetooth 5.3 connectivity, app-based EQ customization, and Soundcore PartyCast support make it a versatile, must-have audio companion for millennials who demand premium sound on the move.

Specifications

ASIN	B09VKZPST7
Antenna Location	Outdoor, music, camping
Audio Driver Size	30 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Battery Average Life	20 Hours
Battery Capacity	13400 Milliamp Hours
Battery Charge Time	5.5 Hours
Best Sellers Rank	106 in Portable Bluetooth Speakers
Bluetooth Range	15 Metres
Box Contents	60cm C-C cable* 1, Happy card1, QSG1, Safety1, speaker1
Brand Name	soundcore
Colour	Black
Compatible Devices	Smartphone
Compatible with Vehicle Type	ATV, Boat, Car, Motorcycle, Truck, UTV
Connectivity Protocol	Bluetooth
Control Method	App
Controller Type	App Control
Country of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (10,180)
EU Spare Part Availability Duration	7 Years
Enclosure Material	SKZZF144
Frequency Response	20 KHz
Global Trade Identification Number	00194644098421
Input Voltage	5 Volts
Is Electric	Yes
Is Waterproof	True
Item Dimensions D x W x H	14D x 39W x 20H centimetres
Item Weight	2.28 kg
MP3 player	No
Manufacturer	Anker
Maximum Range	100 Metres
Maximum Speaker Output Power (in watts)	80 Watts
Model Name	A3129
Model Number	A3129
Mounting Type	Tabletop Mount
Network Connectivity Technology	Bluetooth
Number of Audio Channels	2.1
Number of Batteries	1 C batteries required.
Number of Items	1
Number of Power Levels	1
Power Source	Battery Powered
Product Features	Bluetooth, Waterproof, Long Battery Life, BassUp Technology
Product Warranty	18.00
Series Number	3129
Signal-to-Noise Ratio	75 dB
Speaker Size	3.5 Inches
Speaker Type	Outdoor
Specific Uses For Product	Camping, Music, Outdoor
Subwoofer Connectivity Technology	Wireless
Tweeter Diameter	2 Inches
UPC	194644098421
Warranty Type	Limited
Water Resistance Level	Waterproof
Wireless Technology Type	Bluetooth
Woofer Driver Diameter	20.32 Centimetres

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