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KEF KUBE 10b vs Focal Sub Air Comparison
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KEF KUBE 10b

Powered Subwoofer | 24-140 Hz

KEF KUBE 10b
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Focal Sub Air

Powered Subwoofer | 40-200 Hz

Focal Sub Air
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KEF KUBE 10b KEF KUBE 10b
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Focal Sub Air Focal Sub Air
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KEF KUBE 10b
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Focal Sub Air
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KEF KUBE 10b vs Focal Sub Air Speaker Comparison

In this review, we will be comparing KUBE 10b and Sub Air, two Powered Subwoofer speakers from KEF and Focal. Being Powered subwoofers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features of KEF KUBE 10b and Focal Sub Air first before getting into our more detailed comparison.

KEF KUBE 10b Key Specs

  • 10" Not given Woofer
  • 24-140 Hz Frequency Response
  • 300 watts Max Amplifier Output
  • Weight:17.50kg
  • Dimensions (H x W x D): 372.0" x 14" x 15-5/8"( 372.0 x 356.0 x 397.0mm )

Focal Sub Air Key Specs

  • 8" Cellulose Pulp Woofer
  • 40-200 Hz Frequency Response
  • 110 watts Max Amplifier Output
  • Weight:7.73kg
  • Dimensions (H x W x D): 410.0" x 14-1/4" x 6-3/8"( 410.0 x 362.0 x 162.0mm )

In the following sections, we will get into details in order to better understand how the KEF KUBE 10b and Focal Sub Air compare and hopefully end up with enough arguments to decide which one of these subwoofers is the better choice for you.


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Drivers

The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Both KEF KUBE 10band Focal Sub Air have a single woofer setup however the KEF KUBE 10b's woofer is 10-inch whereas the Focal Sub Air features a 8-inch woofer.

Frequency Response

KUBE 10b has a frequency range of 24-140 Hz whereas Sub Air has a frequency range of 40-200 Hz. With a minimum frequency of 24Hz, the KUBE 10b can go significantly deeper on the low side and provide stronger bass compared to the Sub Air's min frequency of 40Hz.

Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Subwoofer class in our database.

Low Frequency

Subwoofer Speakers

KEF KUBE 10b
Focal Sub Air
Min
Average
Max
High Frequency

Subwoofer Speakers

KEF KUBE 10b
Focal Sub Air
Min
Average
Max

Cabinet Type

The KEF KUBE 10b has a Acoustic Suspension type cabinet. Acoustic Suspension aka Sealed type subwoofers have enclosures that are sealed hence no ports or holes exists on the cabinet. Sealed designs helps to provide more accurate and tight bass responses compared to ported designs. On the other hand the Focal Sub Air have Bass Reflex type enclosure. Bass Reflex type subwoofers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.

Physical Specs

Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare KEF KUBE 10b's and Focal Sub Air's external dimensions. KEF KUBE 10b has external dimensions of 372.0 x 356.0 x 397.0mm ( 14-5/8 x 14 x 15-5/8inch) whereas Focal Sub Air has external dimensions of 410.0 x 362.0 x 162.0mm ( 16-1/8 x 14-1/4 x 6-3/8inch) .

KEF KUBE 10b is 6mm narrower and 38mm shorter than Focal Sub Air but it is also 235mm deeper.

Below you can see the front view size comparison of KEF KUBE 10b and Focal Sub Air in scale.

KEF KUBE 10b vs Focal Sub Air Size Comparison - Front View
Comparison image of KEF KUBE 10b and Focal Sub Air Size and External Dimensions

Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base surface area of the KEF KUBE 10b is approximately 1413.3cm2 / 219.1inch2 and base area of the Focal Sub Air is approximately 586.4cm2 / 90.9inch2. The KUBE 10b requires 141% more surface area than the Sub Air which gives it a small disadvantage on placement in tight spaces.

Weight Comparison

The weight of a subwoofer may become an important factor if you need to move and reposition the unit often to find the optimal positioning, also known as 'Subwoofer Crawling'. The KEF KUBE 10b weighs 17.50kg / 38.5lbs and the Focal Sub Air weighs 7.73kg / 17lbs. This makes the KUBE 10b 126% heavier than the Sub Air.

Here is a comparison of how KUBE 10b and Sub Air's weights compare with the average, max and min weights in Powered Subwoofer class.

Weight
All Subwoofer Speakers
KEF KUBE 10b
Focal Sub Air
Min
Average
Max

What's in the Box of KEF KUBE 10b?

Here are the items that are included inside the box of KUBE 10b:
  • Powered subwoofer
  • 6.5-feet AC power cord
  • Speaker-level input block
  • User Manual
  • Important Safety Information
  • Warranty Information
  • What's in the Box of Focal Sub Air?

    Here are the items that come with the Sub Air:
  • Wireless powered subwoofer
  • Wireless transmitter
  • AC power adapter (attached 6-feet DC cord)
  • AC power plug insert (2-prong)
  • 8-feet AC power cord
  • 4 Rubber feet
  • 2 Brackets
  • Four M4 x 10mm machine screws
  • Four M4 x 17mm machine screws
  • 4 Wood-screws
  • 4 Wall-anchors
  • User Manual

  • Reasons to choose KEF KUBE 10b over Focal Sub Air
    Woofer Size 10 inches vs 8 inches Larger woofer
    Low Frequency Response 24 Hz vs 40 Hz Generates deeper bass
    Height 372mm vs 410mm Easier to fit in smaller spaces
    Price per pair* 750USD vs 1299USD costs less (*prices may change depending on the seller, location and time)
    Reasons to choose Focal Sub Air over KEF KUBE 10b
    High Frequency Response 200k Hz vs 140k Hz Generates higher frequency
    Base Surface Area 586cm2 vs 1413cm2 Takes less floor space
    KEF KUBE 10b vs Focal Sub Air Specs Table
    Detailed comparison of specifications
    General KEF KUBE 10b Focal Sub Air
    Brand KEF Focal
    Speaker Type Powered Subwoofer Powered Subwoofer
    Max Amplifier Output 300 watts 110 watts
    Frequency Response 24-140 Hz 40-200 Hz
    Amplifier
    Watts RMS (Continuous) 300-watt RMS 110-watt RMS
    Drivers
    Woofer Quantity 1 1
    Woofer Size 10" 8"
    Woofer Composition Not given Cellulose Pulp
    Tweeter Size - -
    Aimable Tweeter No No
    Midrange Driver No No
    Crossover Frequency 40-140 Hz n/a
    Firing Direction front front
    Physical Specs
    Height 372.0mm (14.6") 410.0mm (16.1")
    Width 356.0mm (14") 362.0mm (14.3")
    Depth 397.0mm (15.6") 162.0mm (6.4")
    Weight 17.50kg (38.5lbs) 7.73kg (17lbs)
    Enclosure Acoustic Suspension Bass Reflex
    Moisture Resistancy No No
    Connections
    Other
    Parts Warranty 2 Years 3 Years
    Labor Warranty 2 Years 3 Years

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