Ci series
Installation Manual
C8S
Subwoofer
C8S BLK/C8S WHT
C8S is a compact and shallow on-wall subwoofer. The subwoofers face the wall and the sound is
reected out to the surroundings, allowing the subwoofer to blend discretely into any modern
environment and offering full protection of the drivers.
The C8S features a powerful 8” subwoofer with dual voice coil and a passive radiator to extend the
sub bass performance to below 34 Hz. The built-in crossover with heavy duty terminals allows the
cables for the top-boxes to be connected directly from the C8S. The subwoofer features an integrated
mounting system with removable feet. It can be wall-mounted with the drivers facing inward, or, by
removing the feet, positioned on its front with the drivers facing upward—ideal for placement under
sofa or other furniture. Measuring only 16 cm deep – or 19 cm with wall mount, the C8S offers very
loud output for its size with real sub bass extension.
C8S is available in black and white and is designed to be used together with the Ci loudspeaker series by
Blaze Audio.
Included in the box:
Subwoofer
Wall bracket
Mounting template
Safety letter
Introduction
Left speaker
Right speaker
Installation
There are three distinct methods for connecting the subwoofer to the input terminals. We recommend
utilizing our PowerZone™ Connect amplier series, which is designed to seamlessly integrate with our
downloadable speaker presets accessible at blaze-audio.com.
Option 1: If you’re NOT using a PowerZone™ Connect amplier, consider using option 1.
Options 2 or 3: If your loudspeakers and C8S bass module are linked to our PowerZone™ Connect
amplier, options 2 or 3 can be effectively utilized.
Connecting the speaker cable.
There are two sets of speaker terminals. The left terminal is for left and right input from the amplier,
while the right terminal serves as outputs for top-boxes.
OutputInput
L
R
L
R
+ - + -
Option 1: Stereo Mode 8 ohm
1. Connect the positive (+) terminals from each amplier output to the red terminals on the subwoofer,
and connect the negative (-) terminals from each amplier output to the black input terminals on the C8S.
2. Connect L red (+) from the subwoofer output terminal to the red (+) input on your left speaker, and
L black (-) from the subwoofer output terminal to the black (-) terminal on your left speaker. Likewise,
connect R red (+) on the subwoofer output terminal to the red (+) input on your right speaker, and
R black (-) from the subwoofer output terminal to the black (-) terminal on your right speaker.
Note: When connecting, polarity shall NOT be reversed, as the reected sound from the wall will be in
phase with the top-boxes.
OutputInput
L
R
L
R
+ - + -
Left speaker
Right speaker
+ - + -
C8S Subwoofer
Option 2: Dual Mono Sum 4 ohm:
This conguration is ideal for use with our PowerZone™ Connect amplier series. The subwoofer’s dual
voice coil bass unit allows for parallel connection of the inputs, requiring only a single cable run to the
subwoofer. This low-impedance solution is particularly suitable when long cable runs are not needed.
1. Connect the positive (+) terminals from the amplier output to the red terminals on the subwoofer,
and connect the negative (-) terminals from the amplier output to the black input terminals on the C8S.
2. Establish a parallel connection between the L and R inputs as illustrated in the diagram.
Note: The output on the PowerZone™ Connect amplier. shall be set to “Sum” of Left and Right in
Output Routing
OutputInput
Left speaker
Right speaker
L
R
L
R
+ - + -
+ - + -
C8S Subwoofer
Option 3: Dual Mono Sum 16 ohm:
This conguration is ideal for use with our PowerZone™ Connect amplier series. The subwoofer’s dual
voice coil allows for serial connection of the inputs, requiring only a single cable run to the subwoofer.
This 16 ohm solution is advantageous when long cable runs are necessary.
1. Connect the positive (+) terminals to the L red terminal, and the negative (-) to the R black terminal.
2. Establish a serial connection between the L and R inputs as illustrated in the diagram
Note: The output on the PowerZone™ Connect amplier shall be set to 100 V using two (2) outputs as
shown in amplier manual.
OutputInput
Left speaker
Right speaker
L
R
L
R
+ - + -
+ - + -
C8S Subwoofer
Positioning the cabinet.
C8S is designed to be mounted on the wall with the woofers facing inwards. It is also possible to have it
standing with the woofers facing down towards the oor.
For installation on wall:
Up
Left speaker
Right speaker
Speaker presets.
Recommended loudspeaker presets are available at blaze-audio.com/support and are designed for use
with Blaze Audio’s PowerZone™ Connect DSP-enabled amplier series.
Recommended amplier.
The C8S Subwoofer has a high minimum impedance, making them an easy load for ampliers. We
recommend using Blaze Audio’s PowerZone™ Connect DSP-enabled ampliers with power ratings that
exceed the subwoofers’ power handling capacity (see specications). As with all loudspeaker systems,
power handling depends on the quality and size of the amplier. If the amplier is overdriven and runs
into clipping, the drivers can be damaged, even if the amplier’s output is lower than the speaker’s
power handling capacity. When selecting an amplier, keep in mind that a higher power amplier
operating without distortion will typically sound better and cause less damage to the loudspeaker than a
lower power amplier that is constantly clipping.
1 2
3
Mark screw holes for wall bracket
using the provided template.
Mount the included wall
bracket to the wall with the
included screws.
After the speaker cables are
mounted to the terminals, hang
the C8S in the bracket.
Cables
Speaker cables present the amplier with different loads. Cables with high capacitance, high inductance
and high impedance have a strong negative inuence on sound quality as well as amplier reliability. In
order to get the most out of the speaker system, avoid using thin speaker cables.
As a rule of thumb, 2 mm
2
(14 AWG) cable can be used for lengths up to 20 meters. 4 mm
2
(11 AWG)
cable should be used for lengths over 20 meters. For lengths over 50 meters, most ampliers will
become unstable and sound quality is reduced signicantly.
To minimize power loss and response variations, please refer to the following table for guidance,
showing the maximum recommended cable length relative to impedance and cable thickness:
Cable size/load
2 sq mm.
2,5 sq mm.
4 sq mm.
8 Ω
20 m / 65 ft.
30 m / 100 ft.
60 m /200 ft.
4 Ω
10 m /32 ft.
15 m /50 ft.
30 m /100 ft.
2 Ω
5 m / 16 ft.
7,5 m / 25ft.
15 m / 50 ft.
Warranty.
For warranty information, please refer to your local Blaze Audio distributor or dealer, or contact us
directly.
Service.
Spare parts for your Blaze Audio speakers are available through your local Blaze Audio distributor or
dealer. Please contact us directly, in case you are not able to source spare parts locally.
©2025 Sonance. All rights reserved. Sonance is a registered trademarks of Dana Innovations.
Due to continuous product improvement, all features and specifications are subject to change without notice.
For the latest Sonance product specification information visit our website at www.sonance.com.
SONANCE • 991 Calle Amanecer • San Clemente, CA 92673 USA • Phone: (949) 492-7777 • Technical Support: (949) 492-7777 • www.sonance.com • 07.01.25
Rev F 23/06/2025
Specications
374 mm
530 mm
190 mm
32 mm
32 mm
Sensitivity SPL / 1W @ 1m: 88 dB
Maximum SPL, Long Term: 108 dB
Maximum SPL, Peak: 114 dB
Frequency response: 30-240 Hz
Nominal impedance: 8 Ω
Ingress Protection: Indoor use only
Recommended amplifier: 50-150 W into 8 Ω
Measurements with wall mount: 530 x 374 x 190 mm
(20.87 x 14.72 x 7.48 in)
Weight: 10,7 kg (23.59 lb)
Colour: Matt White (RAL9010)
Matt Black (RAL9005)
