Skip to content
Orders Profile
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure
In Phase XTB-828R 8 inch 300W active subwoofer enclosure

In Phase XTB-828R 8" 300W Active Subwoofer with Passive Radiator and Class D Amplifer

Save 60% Save 60%
£249.00 GBP
£249.00 GBP - £249.00 GBP
£249.00 GBP
£99.99 GBP
£99.99 GBP - £99.99 GBP
£99.99 GBP
by In Phase
SKU 82996
Availability:
In stock
  • Free & Next-Day Delivery Available

    Next Day Delivery

  • Hassle-Free Returns Within 30 Days

    Hassle-Free Returns

  • Free & Next-Day Delivery Available

    Quality Products

Key Features
  • True Bass Accuracy: Experience true bass accuracy with deep and controlled bass frequencies not typically found in standard active subwoofers.
  • Passive Radiator Technology: Equipped with a passive radiator alongside the 20cm (8') drive unit, allowing for enhanced bass response without the downsides of ported enclosures.
  • Compact Design: Compact size, similar to a small desktop computer case, ensures thumping bass without compromising space in the boot.
  • Class D Amplifier: Built-in 300W Class D amplifier provides high power handling and efficient performance.
  • High and Low-Level Inputs: Compatible with both aftermarket and OEM head units for versatile connectivity options.
  • Superior Subwoofer Cone: Glass fibre woven cone is lightweight, durable, and purpose-built for optimal sound quality, offering a unique and performance-based solution.
  • Complete Package: Comes with a wiring kit and RCA cables for easy installation, making it a convenient and comprehensive solution for adding bass to your car audio system.
  • Smooth Bass Output: Eliminates port noise common in ported designs, providing smooth and linear bass output for enhanced sound quality.
  • Unique Technology: Utilizes Passive Radiator technology for better sound quality and higher output compared to traditional ported designs, offering a more efficient and compact solution.
  • Unprecedented Innovation: A unique and innovative solution by In Phase, offering superior performance and exceptional bass reproduction.
Specifications

ParameterValue
RCA Input Sensitivity0.2 - 6 V
High Level Input Sensitivity1 V
Phase Switch0 - 180 Degrees
Dimensions248 mm x 255 mm x 250 mm
Weight8 kg
RMS Power200 W
Max Power300 W
S/N Ratio> 88 dB
Fuse Rating25 A
Bass Boost0 dB ~ +12 dB
Protection CircuitThermal and short
Impedance4 ohms
LPF50 - 150 Hz

Shipping information

Free Standard Delivery on all orders over: £50.00 (Excludes Northern Ireland, Channel Islands and International Orders)

UK Next Working Day Delivery with DPD: Need your order urgently? Take advantage of our next working day delivery option by placing your order before 16:00. This excludes Northern Ireland, Scottish Highlands and Channel Islands (Sorry!)

Saturday Delivery Option with DPD: Choose our Saturday delivery option during checkout for seamless and convenient weekend delivery, ensuring your needs are met precisely when you need them. This excludes Northern Ireland, Scottish Highlands and Channel Islands (Sorry!)

We are dedicated to providing exceptional service and convenience, ensuring swift and efficient delivery of your products. Benefit from our various delivery options tailored to meet your specific preferences and requirements.

Returns & warranty

Hassle-free Returns: At Car Audio Discount, we strive for your satisfaction. If you are not completely satisfied with your purchase, we offer a straightforward 14-Day Money Back Guarantee. Simply return any unused and unopened products within 14 days of delivery for a full refund.

Easy Return Process: To initiate a return, please ensure the product is in its original, unused condition and contact our customer service team. We will guide you through the simple return process and ensure a prompt refund.

Customer Satisfaction Priority: We place a strong emphasis on customer satisfaction and aim to make the return and refund process as convenient as possible for you. Your feedback is valuable to us, and we are dedicated to resolving any concerns promptly and efficiently.

Shop with confidence at Car Audio Discount, knowing that our 14-Day Money Back Guarantee ensures a hassle-free return process for your convenience and peace of mind.

From the manufacturer

  • 5 stars: 95 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
J
Jan B.

Awesome product for great price.

Jan B. review photo
A
Anonymous

very good subwoofer, good value for money

T
Tim H.

Delivery was fast! The unit looks really well-made actually nice and presentable

M
MJ

Impressive sound out of a small unit - fast easy install

D
David

Great Black Friday deal, fast delivery, sounds great in a small van👌 perfect seller..thank You!!!

M
Mark J.

Very fast shipping and works perfectly
Will definitely use your store again

M
Mark J.

Very fast shipping and works perfectly
Will definitely use your store again

M
Mark

Very fast shipping and works perfectly
Will definitely use your store again

p
patrick d.

Good sound for its size and nice finish

p
patrick d.

Good sound for its size and nice finish

p
patrick d.

Good sound for its size and nice finish

P
Paul L.

awesome sound..small unit

P
Paul L.

awesome sound..small unit

P
Paul L.

awesome sound..small unit

A
Anonymous

replacing factory harmankardon sub in my merc aclass, which was previously upgraded with a 6.75" kicker sub, installation a breeze, using existing sub speaker outputs :) just playing with controls but so far so good, enough low bass and kick to satisfy and with control and clarity as well, smooth in a small neat box. last time had a sub in my car was in my youth had twin 10"'s.

A
Anonymous

replacing factory harmankardon sub in my merc aclass, which was previously upgraded with a 6.75" kicker sub, installation a breeze, using existing sub speaker outputs :) just playing with controls but so far so good, enough low bass and kick to satisfy and with control and clarity as well, smooth in a small neat box. last time had a sub in my car was in my youth had twin 10"'s.

A
Anonymous

replacing factory harmankardon sub in my merc aclass, which was previously upgraded with a 6.75" kicker sub, installation a breeze, using existing sub speaker outputs :) just playing with controls but so far so good, enough low bass and kick to satisfy and with control and clarity as well, smooth in a small neat box. last time had a sub in my car was in my youth had twin 10"'s.

A
Anonymous

OMG, this box rocks!

A
Anonymous

OMG, this box rocks!

A
Anonymous

OMG, this box rocks!

A
Anonymous

Fitted this in my classic beetle, more than enough bass, great value for money.

A
Anonymous

Fitted this in my classic beetle, more than enough bass, great value for money.

A
Anonymous

Fitted this in my classic beetle, more than enough bass, great value for money.

A
Anonymous

Great value bass - the best active box on the market for the price. Great having all the wiring included and the remote lead fed from the driving area to adjust to your listening preference.

A
Anonymous

Great value bass - the best active box on the market for the price. Great having all the wiring included and the remote lead fed from the driving area to adjust to your listening preference.

A
Anonymous

Great value bass - the best active box on the market for the price. Great having all the wiring included and the remote lead fed from the driving area to adjust to your listening preference.

A
Anonymous

So much bass from this tiny box, it was easy to fit to my stock stereo. The bass in Unreal.

A
Anonymous

So much bass from this tiny box, it was easy to fit to my stock stereo. The bass in Unreal.

A
Anonymous

So much bass from this tiny box, it was easy to fit to my stock stereo. The bass in Unreal.

A
Anonymous

0

A
Anonymous

0

A
Anonymous

0

A
Anonymous

After trying the alpine SWE-815, I was disappointed. I was then directed on the phone by a CAC member to buy this. Best decision ever!!! The sound of this box was amazing. I couldn't believe it. Best value for money I have ever come across!!

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare