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KEF R400b

KEF R400b
alaScore 88

6 reviews

Apr, 2018

alaTest has collected and analyzed 6 reviews of KEF R400b. The average rating for this product is 4.7/5, compared to an average rating of 4.3/5 for other Speakers for all reviews.

We analyzed user and expert ratings, product age and more factors. Compared to other Speakers the KEF R400b is awarded an overall alaScore™ of 88/100 = Very good quality.

Review analysis

(Based on 6 reviews)

Expert Reviews  

User Reviews  


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Showing 1 - 1 of 1 Show Reviews: in English | in other languages (5)

Expert review by : Greg Borrowman (

KEF R400B Subwoofer Review and Test


My opinion is that this is a brilliantly designed -- and brilliantly executed -- subwoofer.

Product Specifications


Color of product:Black / White

Energy Management

AC input frequency:50/60
AC input voltage:100 - 240
Power source type:AC

Ports & interfaces

Line inputs (RCA):1


AC input frequency:50/60
AC input voltage:100 - 240 / 100-240
Power source type:AC


Subwoofer driver diameter:8.86
Subwoofer driver diameter (imperial):9
Subwoofer driver size:8.86
Subwoofer frequency range:26 - 140
Subwoofer RMS power:500
Subwoofer sensitivity:111
Subwoofer type:Active / active subwoofer

Weight & Dimensions

Subwoofer depth:13.8
Subwoofer height:14.4
Subwoofer weight:47.4
Subwoofer width:13