HOME > FREQUENTLY ASKED QUESTIONS (FAQ) > AUDIO DISTORTION ON SUBWOOFER AND REAR SPEAKERS
Audio Distortion on
Subwoofer and Rear Speakers
These are the 4 most common reasons for audio distortion on subwoofer and rear speakers:
1. Router interference (Applies to All Models)
Our soundbars utilize industry standard 5.8Ghz wireless chipsets to send data wirelessly to the subwoofers. Why is the industry standard 5.8GHz? It is to avoid interference with 5-GHz Wi-Fi home routers, of which 99% of them operate on 5-GHz frequencies that are around the middle of the 5-GHz frequency spectrum. However, there is still a small risk of interference.
A simple fix will be to change the frequency that your router is operating at (All routers come with multiple operating frequency options).
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Shockwafe Soundbar Wireless Frequency: 5.725 - 5.875 GHz
Recommended operating frequency for 5-GHz Wi-Fi Router:
DO NOT USE the following operating frequencies for your 5-GHz Wi-Fi Router:
Note: Depending on modem specification, do not use Auto option for channel selection as the 5 GHz modem may switch to these channels that will interfere with your Shockwafe soundbar.
Please DO NOT use the following channels:
For the detailed instructions on how to change the WiFi router operating frequency:
For mesh network users, they could be a dedicated backhaul WiFi channel at the backend for satellite/secondary device to transmit data with primary router. This is usually unable to configure the operating frequency manually.
To avoid WiFi operating frequency interference:
1. Turn OFF your mesh network routers
2. Turn ON soundbar to establish wireless connection with the subwoofer(s)
3. Stream audio to occupy the wireless connection bandwidth
4. Turn ON your mesh network routers
5. Use the Channel Finder feature (channel scanning equivalent) to search for non-congested WiFi frequency to establish backhaul channel
If you are experiencing Bluetooth streaming interference with the soundbar, change your WiFi router to operate 5GHz WiFi only (Disable 2.4GHz) to avoid interference with the Bluetooth wireless connection, which is also using 2.4GHz
2. Non-optimal conversion by TV (Applies to All Models)
This only occurs when the streaming device is connected via HDMI to TV, and TV is connected via OPTICAL to soundbar.
Example: Your input source device (Nvidia Shield) is connected to your TV via HDMI. But your TV is connected to your soundbar via OPTICAL. In such a setup, the TV is converting the audio from the HDMI input to OPTICAL output to the soundbar, which might lead to the audio cutting in and out.
3. HDCP standard not compatible (Applies to All Models)
This only occurs when connecting HDCP 2.2 and HDCP 2.0 devices directly to soundbar. This may results the soundbar takes longer time to switch between devices. For the devices with older HDCP standard, the playback quality will be restricted to just 1080p HD and lower audio quality.
Solution: We recommend to connect HDCP 2.2 devices directly to soundbar while connecting older HDCP devices directly to TV. The segregation helps to ensure the smooth playback experience for HDCP 2.2 devices that connected to soundbar.
4. Audio Settings (Shockwafe Pro 7.1  Only)
Soundbar is receiving PCM input content from source devices instead of Bitstream, Dolby or DTS
For PCM input content, the audio decoding is done by the source devices. Then, the raw audio signal is sent to the soundbar for playback.
For Bitstream input content, the audio decoding is done by the soundbar (recommended). What happens here is that the source device sends the original audio content to the soundbar for the soundbar to decode.
The benefits of bitstream over PCM are as follows:
Bitstream supports object-based content (e.g DTS:X audio) whereas PCM does not include height channels and additional surround information.
Using a Bitstream signal allows the soundbar to accurately decode and perform channel mapping according to its channel configuration (upmixing if required). Using PCM, on the other hand, may cause audio signals to be outputted by the wrong channels because the decoding is done by the source device, which is independent from the soundbar.
There are 2 types of PCM channel mappings as seen below:
To verify what audio format is being received on the soundbar:
For Shockwafe Ultra 9.2 DTS:X, Elite 7.2 DTS:X and Pro 7.1 DTS:X
Press the INFO button once on your remote control. The audio format being received on the soundbar will be shown on the soundbar's LED display (Dolby, DTS or PCM).
For Shockwafe Pro 7.1 (2016)
When a Dolby Digital or DTS signal is detected, the Dolby Digital (last 3 LEDs) or DTS (last 2 LEDs) indicator will light up for 5 seconds before fading away.
For more information or further assistance, email our customer care team at