Non-PRO inglés al español Técnico/Ingeniería Electrónica / Ing. elect. Description of speakers

Hello, Iam translating some descriptions of different products that are sold on Ebay and there is a word Ican´t understand: BASS

It appears in different sentences and descriptions, for example:

"The Xorb Wireless offers fantastic sound quality and huge bass in a great design.
With Bluetooth you can stream music wirelessly meaning your favourite device doesn't have to leave your hand."

"It's 30watts of power and built in subwoofer ensure there's plenty of bass and power for any party."

"DUO's unique design provides a powerful sub-woofer speaker system with a detachable portable speaker for bass-rich sounds around the home or on your travels."

"The patented Seamless Sound Technology (SST) allows the Satellite Speaker to be effortlessly docked into the Bass Unit where its built-in Lithium-ion battery will automatically recharge making it permanently ready for portable use."

Any idea??

Thank you very much!!!!