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KEF KUBE 8b vs ELAC SUB3070 Comparison
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Subwoofer to replace
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KEF KUBE 8b

Powered Subwoofer | 34-140 Hz

KEF KUBE 8b
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ELAC SUB3070

Powered Subwoofer | 18-180 Hz

ELAC SUB3070
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KEF KUBE 8b KEF KUBE 8b
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ELAC SUB3070 ELAC SUB3070
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KEF KUBE 8b
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ELAC SUB3070
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KEF KUBE 8b vs ELAC SUB3070 Speaker Comparison

In this review, we will be comparing KUBE 8b and SUB3070, two Powered Subwoofer speakers from KEF and ELAC. 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 8b and ELAC SUB3070 first before getting into our more detailed comparison.

KEF KUBE 8b Key Specs

  • 8" Not given Woofer
  • 34-140 Hz Frequency Response
  • 300 watts Max Amplifier Output
  • Weight:11.36kg
  • Dimensions (H x W x D): 294.0" x 11-5/8" x 13-5/16"( 294.0 x 296.0 x 339.0mm )

ELAC SUB3070 Key Specs

  • 12" Aluminum Woofer
  • 18-180 Hz Frequency Response
  • 1200 watts Max Amplifier Output
  • Weight:35.00kg
  • Dimensions (H x W x D): 435.0" x 20-7/16" x 18-3/4"( 435.0 x 520.0 x 477.0mm )

In the following sections, we will get into details in order to better understand how the KEF KUBE 8b and ELAC SUB3070 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 8band ELAC SUB3070 have a single woofer setup however the KEF KUBE 8b's woofer is 8-inch whereas the ELAC SUB3070 features a 12-inch woofer.

Frequency Response

KUBE 8b has a frequency range of 34-140 Hz whereas SUB3070 has a frequency range of 18-180 Hz. With a minimum frequency of 18Hz, the SUB3070 can go significantly deeper on the low side and provide stronger bass compared to the KUBE 8b's min frequency of 34Hz.

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 8b
ELAC SUB3070
Min
Average
Max
High Frequency

Subwoofer Speakers

KEF KUBE 8b
ELAC SUB3070
Min
Average
Max

Cabinet Type

Both KEF KUBE 8b and ELAC SUB3070 have Acoustic Suspension type cabinets. 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.

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 8b's and ELAC SUB3070's external dimensions. KEF KUBE 8b has external dimensions of 294.0 x 296.0 x 339.0mm ( 11-9/16 x 11-5/8 x 13-5/16inch) whereas ELAC SUB3070 has external dimensions of 435.0 x 520.0 x 477.0mm ( 17-1/8 x 20-7/16 x 18-3/4inch) .

ELAC SUB3070 is clearly the larger of the two speakers. Its body is 224mm wider, 141mm taller and 138mm deeper than KEF KUBE 8b.

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 8b is approximately 1003.4cm2 / 155.5inch2 and base area of the ELAC SUB3070 is approximately 2480.4cm2 / 384.5inch2. The KUBE 8b requires 60% less surface area than the SUB3070 which gives it a small advantage 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 8b weighs 11.36kg / 25lbs and the ELAC SUB3070 weighs 35.00kg / 77lbs. This makes the SUB3070 208% heavier than the KUBE 8b.

Here is a comparison of how KUBE 8b and SUB3070's weights compare with the average, max and min weights in Powered Subwoofer class.

Weight
All Subwoofer Speakers
KEF KUBE 8b
ELAC SUB3070
Min
Average
Max

What's in the Box of KEF KUBE 8b?

Here are the items that are included inside the box of KUBE 8b:
  • 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 ELAC SUB3070?

    Here are the items that come with the SUB3070:
  • Powered subwoofer
  • AC power cord
  • 2 Steel bottom plates
  • 4 Spikes
  • 4 Locking-knobs
  • 4 Protective discs
  • Operating Instructions

  • Reasons to choose KEF KUBE 8b over ELAC SUB3070
    Height 294mm vs 435mm Easier to fit in smaller spaces
    Base Surface Area 1003cm2 vs 2480cm2 Takes less floor space
    Reasons to choose ELAC SUB3070 over KEF KUBE 8b
    Woofer Size 12 inches vs 8 inches Larger woofer
    Low Frequency Response 18 Hz vs 34 Hz Generates deeper bass
    High Frequency Response 180k Hz vs 140k Hz Generates higher frequency
    Wireless Operation Yes vs No Connect your subwoofer to your system wireless
    KEF KUBE 8b vs ELAC SUB3070 Specs Table
    Detailed comparison of specifications
    General KEF KUBE 8b ELAC SUB3070
    Brand KEF ELAC
    Speaker Type Powered Subwoofer Powered Subwoofer
    Max Amplifier Output 300 watts 1200 watts
    Frequency Response 34-140 Hz 18-180 Hz
    Amplifier
    Watts RMS (Continuous) 300-watt RMS 1200-watt RMS
    Drivers
    Woofer Quantity 1 1
    Woofer Size 8" 12"
    Woofer Composition Not given Aluminum
    Tweeter Size - -
    Aimable Tweeter No No
    Midrange Driver No No
    Crossover Frequency 40-140 Hz n/a
    Firing Direction front side
    Physical Specs
    Height 294.0mm (11.6") 435.0mm (17.1")
    Width 296.0mm (11.7") 520.0mm (20.5")
    Depth 339.0mm (13.3") 477.0mm (18.8")
    Weight 11.36kg (25lbs) 35.00kg (77lbs)
    Enclosure Acoustic Suspension Acoustic Suspension
    Moisture Resistancy No No
    Connections
    Other
    Parts Warranty 2 Years 1 Year
    Labor Warranty 2 Years 1 Year

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