HomeSpeakerKRK S8.4 Active Studio Subwoofer

KRK S8.4 Active Studio Subwoofer

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£329.00 inc. VAT
In stock
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SKU: DJK45790

KRK S8.4 Active Studio Subwoofer Special Offers When bought with this product

KRK S8.4 Active Studio Subwoofer Product Description

The KRK S8.4 powered studio subwoofer builds upon KRK’s legacy for sonic accuracy in a compact form factor. The custom-voiced, glass-aramid woofer delivers tight, defined bass, while the Class-D power amplifier dramatically increases transient response, control and punch. The four-position selectable crossover lets you adjust the subwoofer setting easily to your existing monitors.

Pairing the S8.4 subwoofer with KRK or another studio monitor delivers an optimized mixing and listening experience with extended low end, while the exclusive bypass-control feature provides full range audio to the monitors without switching off the subwoofer. KRK’s S8.4 subwoofer doesn’t just deliver precise bass and a rich feature set: it’s the next dimension in subwoofer performance.

Bypass Footswitch

Mix with confidence. The bypass footswitch control allows you to quickly mute the sub and send full-range audio to your recording monitors.

Heavy Duty Enclosure

KRK Subwoofers feature reinforced MDF enclosures for maximum strength and durability. Never let a spilled beer or wild ninja roundhouse kick stop your mixing session again.

Front-firing Port

KRK engineered the front port to provide low frequency extension while reducing boundary coupling. The unique shape is optimized to avoid port turbulence.


S8.4 Features

  • 8" glass aramid composite woofer
  • Bass extension to 29Hz with a max SPL of 112.8 dB
  • Footswitch control enables/disables sub and crossover filter (footswitch not included)
  • Redesigned cabinet with a lower profile and front-firing bass port
  • Powerful, lightweight Class D amplification
  • Optimized four-position crossover control
  • Universal connectivity: XLR, 1/4" TRS, and RCA inputs and outputs
  • Polarity and input sensitivity controls
  • Ground lift switch prevents ground loops

KRK S8.4 Active Studio Subwoofer Bundles


Technical Specs


Front Loaded, Vented Subwoofer

System Type

Active Subwoofer


8" Glass Aramid Composite Woofer

Frequency Response

34.5Hz - 133Hz

Max Peak SPL

112.8 dB


Class D

Power Output (Continous)

109 Watts @ 1% THD+N @ 46Hz

Signal to Noise Ratio

92 dB

Amplifier Distortion (THD + N)

≤ 0.1% @-3dB Of Max Power Output 35Hz-133Hz

Input Impedance

9.4 KΩ Balanced, 9.2 KΩ Unbalanced

Ground Lift


HPF Bypass

With Footswitch Only





Input Connectors

XLR L/R, 1/4" TRS L/R, RCA L/R, 1/4" Footswitch

LFE Input


Output Connectors

XLR L/R, 1/4" TRS L/R, RCA L/R

AC Power Input



15 mm and 18 mm Reinforced MDF


Black Vinyl Wrap, Baffle - Black Paint


EVA Isolation Pad

Dimensions (H x W x D)

(H x W x D): 11" (279 mm) x 16.125" (410 mm) x 11.5" (292 mm)


26.5 lb. (12 kg.)

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KRK S8.4 Active Studio Subwoofer Reviews

Do you own the KRK S8.4 Active Studio Subwoofer? Why not write a review based on your experience with it.
7 February, 2022
I bought this along with two krk rokit 5s as a TV home cinema set up. The sound quality, depth, range, and volume exceed all expectations. And of course you can listen to music like nothing else !
0 found this helpful
7 August, 2021
Great speaker
Fantastic sound at a great price. Also great service as really helpful and delivered the following day.
0 found this helpful

KRK S8.4 Active Studio Subwoofer Questions

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KRK S8.4 Active Studio Subwoofer
£329.00 inc. VAT

Delivery And Stock Information

Free next working day delivery on all orders over £50 placed before 3:30pm Monday to Friday.

Orders placed at the weekend or after 3.30pm on Friday will be delivered on the following Tuesday (excluding Bank Holidays).

Larger items / orders e.g large bass speakers or multiple speakers may have to be shipped via a pallet service which may take 1-2 days.

Free next day delivery applies only to the UK mainland for orders over £50. Other locations will be charged as follows:

    • Highlands and Islands 2-3 Days* + £25
    • Northern Ireland 2-3 Days* +£10
    • Deliveries will be made subject to the terms and conditions of the courier company. will not be held responsible for late deliveries.

In the event that the items ordered are unavailable for next day delivery, you will be contacted by to arrange a suitable delivery date.

"In stock" means that the product displayed is either in stock with ourselves or our suppliers and is available for delivery. Stock levels are subject to change without prior notice.


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Finance Available!

0% Interest Free Finance!
0% Finance on all orders over £280
10% deposit then 12 months payment of £18.37

You can apply for finance to purchase this item. A minimum 10% deposit is required and you can opt for either 12, 24 or 36 monthly payments thereafter 17.9% APR.

KRK S8.4 Active Studio Subwoofer
from £10.74/month

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