I purchased three stereo wireless audio transmitters and tested their frequency response, distortion, channel matching, and delay. The results are below.
I utilized the Motu M2 audio interface and REW to take these measurements. I used REW’s soundcard calibration on the M2 before taking these measurements. Ultimately, I was looking to compare these units against each other. I took these measurements a year ago and never got around to posting it. @amirm has since measured the SVS unit and currently has the Dynasty unit for testing so we should have some precision measurements of that one too.
SVS SoundPath Wireless Audio Adapter:
Price: $120
Wireless: 2.4Ghz
Measured Delay: 25.2ms
Claimed Frequency Response: 6 Hz to 22,000 Hz +/-1 dB
Manufacturer claims 14ms latency on their site, but the Amazon listing says less then 25.5ms and that is true—barely.
Dynasty Proaudio WSA-5TR
Price: $110
Wireless: 5.8Ghz
Measured Delay: 17.75ms
Claimed Frequency Response: 10Hz ~ 23 kHz
Dynasty has a new version that supports 5.2Ghz and 5.8Ghz and roughly doubles the number of auto selectable channels.
Amphony iFinity Wireless:
Price: $59
Wireless: 2.4Ghz
Measured Delay: 31.3ms
Claimed Frequency Response: 2 Hz - 20 kHz
Distortion and Noise:
Frequency Response:
You will notice that the SVS has the worst noise and distortion performance. It’s delay lands in the middle of the three units. Looking at the frequency response graph, you’ll note that I’ve included both the left and right channels. This is because it has a 1db mismatch. All the other units matched their left and right channels exactly.
The infinity has about a 1db fall off above 15kHz.
The scale on these graphs is quite zoomed in to show the differences. The frequency response is more or less flat, and I didn’t consider it a major issue for the subwoofer use case.
To achieve the design goals for my listening room, I needed to transmit the subwoofer audio signal wirelessly. Because I was planning to utilize Multi Sub Optimizer to flatten the response, I didn’t want to introduce too much delay in the transmission that would require excessive delay applied to the main speakers. The room is used to watch TV as well as listen to music, and while it would be irrelevant for music, a huge delay in the audio chain would cause lip sync issues.
I ultimately went with the Dynasty unit and it worked well enough. I would occasionally have connectivity issues that would require a power cycle (less than once a month). I ended up adding a 5Ghz access point near-by that I believe started causing more interference. These units operate in the same 5.15 GHz to 5.85 GHz range that WiFi networks use. Depending on your WiFi density you could have similar interference issues. I ultimately replaced these with a set of Dante AVIO devices, and they have been rock solid.
The other units operate in the 2.4Ghz band that is also shared with WiFi networks.
I utilized the Motu M2 audio interface and REW to take these measurements. I used REW’s soundcard calibration on the M2 before taking these measurements. Ultimately, I was looking to compare these units against each other. I took these measurements a year ago and never got around to posting it. @amirm has since measured the SVS unit and currently has the Dynasty unit for testing so we should have some precision measurements of that one too.
SVS SoundPath Wireless Audio Adapter:
Price: $120
Wireless: 2.4Ghz
Measured Delay: 25.2ms
Claimed Frequency Response: 6 Hz to 22,000 Hz +/-1 dB
Manufacturer claims 14ms latency on their site, but the Amazon listing says less then 25.5ms and that is true—barely.
Dynasty Proaudio WSA-5TR
Price: $110
Wireless: 5.8Ghz
Measured Delay: 17.75ms
Claimed Frequency Response: 10Hz ~ 23 kHz
Dynasty has a new version that supports 5.2Ghz and 5.8Ghz and roughly doubles the number of auto selectable channels.
Amphony iFinity Wireless:
Price: $59
Wireless: 2.4Ghz
Measured Delay: 31.3ms
Claimed Frequency Response: 2 Hz - 20 kHz
Distortion and Noise:
Frequency Response:
You will notice that the SVS has the worst noise and distortion performance. It’s delay lands in the middle of the three units. Looking at the frequency response graph, you’ll note that I’ve included both the left and right channels. This is because it has a 1db mismatch. All the other units matched their left and right channels exactly.
The infinity has about a 1db fall off above 15kHz.
The scale on these graphs is quite zoomed in to show the differences. The frequency response is more or less flat, and I didn’t consider it a major issue for the subwoofer use case.
To achieve the design goals for my listening room, I needed to transmit the subwoofer audio signal wirelessly. Because I was planning to utilize Multi Sub Optimizer to flatten the response, I didn’t want to introduce too much delay in the transmission that would require excessive delay applied to the main speakers. The room is used to watch TV as well as listen to music, and while it would be irrelevant for music, a huge delay in the audio chain would cause lip sync issues.
I ultimately went with the Dynasty unit and it worked well enough. I would occasionally have connectivity issues that would require a power cycle (less than once a month). I ended up adding a 5Ghz access point near-by that I believe started causing more interference. These units operate in the same 5.15 GHz to 5.85 GHz range that WiFi networks use. Depending on your WiFi density you could have similar interference issues. I ultimately replaced these with a set of Dante AVIO devices, and they have been rock solid.
The other units operate in the 2.4Ghz band that is also shared with WiFi networks.
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