Free UK DeliveryFinance at checkout30 Day ReturnsWorldwide DeliveryAudio Affair Facebook

Warehouse Clearance


ATC C4 SUB Mk2 Limited Edition Subwoofer


. 0 Reviews . Write a Review

Enquiry/price check? Click here SKU: ATCC4SUBMK2LE
Ex VAT: £6,245.83

Available. To discuss, call 0121 224 7300/7401

Condition: Brand new in original retail packaging

Earn 7495 loyalty points when you order this item.

This item is unavailable to order online. To discuss this item, please call us on 0121 224 7300/7401 or send us an enquiry

You can earn loyalty points on every order you place on this website. If you select to create an account at checkout, your loyalty points will be saved and you can use these to discount future orders online. 


Each product page shows you how many loyalty points you can earn when you order that item. Essentially, for each £1 you spend, you earn 1 loyalty point and for every 1 point earned, 1p will be added to your loyalty point balance (this is the same as some of the UK's biggest loyalty point cards). So for example, if you spend £500, you'll earn 500 loyalty points which can be used to discount a future order by £5.00. 


Read more

Get a trade in quote

To reduce the price of this item, we may be able to accept your old equipment as a trade in (part exchange).

Please send us your details along with details of the item(s) you'd like to trade in and we'll come back to you within 2 working days (but usually a little sooner) with a quote.

Send us a message now

Do you have any questions on this item you'd like us to answer? Or have you seen it cheaper elsewhere and would like us to see if we can beat it? Send us the details below and we'll come back to you quickly (usually within 24hrs, sooner during opening hours)


Colour Blue High Gloss
Brand ATC Speakers

Product Description

To celebrate ATC’s 50th anniversary an upgraded subwoofer has been released. The ATC C4 SUB Mk2 Limited Edition Subwoofer is designed to go with the SCM20ASL Limited Edition Speakers. The subwoofer features a matching gloss blue cabinet and leather upholstered baffle as well as silver anodized components.

The design is built without compromise and offers new standards of bass clarity for movies and music. This subwoofer is made in England and also features outputs so that subwoofers can be daisy chained or active speakers connected directly to the subwoofer. The ATC c4 Sub Mk2 is limited to 20.

300 watt class A/B amplifier

The ATC C4 SUB Mk2 Limited Edition Subwoofer features a 300-watt MOSFET Class A/B amplifier for plenty of power. There is also adjustable gain as well as a low pass filter with four settings. Moreover, there are polarity and phase settings. Unusually Class D is not used for this premium unit. Two XLR line-level connectors are provided for the inputs one for each stereo channel.

Balanced XLR connections are preferred, however converter cables are available with an RCA connector on one end. Balanced connectors work by having three conductors per channel. One has a positive signal while the other has a negative signal. When these out-of-phase signals are combined at the subwoofer the cable tends to cancel out any noise.

Why a subwoofer?

Smaller bookshelf speakers often have limited bass response, hence the need for a subwoofer. Moreover, movie soundtracks are mixed with a subwoofer output in mind. Additionally, more advanced AV receivers will also have an LFE or Low-Frequency Effects channel so that two subwoofers are used.

The ATC C4 SUB Mk2 Limited Edition Subwoofer has line-level inputs intended for AV receivers with subwoofer outputs. Older amplifiers may not have these outputs. However, subwoofers with line-level inputs are available.

Using a subwoofer

There are various settings that need to be calibrated before using a subwoofer. The input is line level and the subwoofer outputs of an AV receiver should be used. Firstly the input level is set. This should be set to 0dB if both inputs are used. It can then be adjusted so that the bass does not overpower the main speakers at normal listening levels.

The polarity setting is used to correct the polarity of the input signal. When set to - the output will be the reverse polarity of the input. The phase adjustment is used to compensate for phase shifts between the subwoofer and the main speakers and can be set by ear. Lastly, the low pass filter is set to match the cut-off frequency of the main speakers.

Subwoofer positioning

Subwoofer placement is important to prevent booming. The room can act as a filter affecting the sound. Room modes can cause uneven frequency response with either too much or too little bass at the listening position. As a result, try to avoid placing the subwoofer in corners or mid-way along parallel walls.

Write Your Own Review

Write a Review

  • 1 star 2 stars 3 stars 4 stars 5 stars
    1 Star 2 Star 3 Star 4 Star 5 Star


Contact Details

Customer Services Landline
0121 224 7350/7351

Sales Landline
0121 224 7300/7401

Sales WhatsApp
07706 203859

As Featured/Seen In

The Telegraph
Gadget Show
BBC Midlands Today
Birmingham Mail
Hi-Fi Choice Magazine

Mobile Site

Copyright © Audio Affair (Alexander Michael LTD) 2006-2024. Vat No. 913183835. All rights reserved.