As above. Would a few of these, screwed/glued to surfaces, perhaps filled with felt/foam help reduce standing waves and reflections? 🙂
https://www.amazon.co.uk/Suwimut-Flexible-Training-Activity-Basketball/dp/B097PM736F/ref=sr_1_15?crid=SD87ZBZWA6NW&dib=eyJ2IjoiMSJ9.Un9uyLddcefvvNxpqxFoPm52GjgjR43MJu0W-nWkqfyrCElDYc2LMcNFcB4VoP_8-VlZ5u9zfoJBviy2jrDUwR-SM7DpLCzrqMOO1ELhv3yApyMzJ5QlOQNye9Zpocbmv41X7kfVRWo2axlynSJ8G6I4ri4Rsonv6o9PsbqR4xmN7ARNVegBS0n4qktcbsGLrb7zaZ2tjBXAjbZx_mWxLzm0_g7zy3c1rjSuusuolTc8cdLV2lZOSZMYciMyHN0fIo_E93e6G8Tx_cPraamEDBW1PZn4rJWzgRiiw4OQxp7vg1JfM9yvtUilJwqaOcJ1ZD70kyrviGJXoH8jqYw9PD45s8hypYeefoFWXcH45cLwfCPILE43Uga8hkqCkWOP68kLhw5Uuht6aXnVBwlvL1YcmDckr_VRMU-LPHeZR5TJ6VWtFCAxQGjhcps1rQqm.NyZU2Q4t5vmuqSljTw8nAMcHzTuaQPu_5uUXlaS2mpk&dib_tag=se&keywords=plastic+cones&qid=1743431284&sprefix=,aps,163&sr=8-15
https://www.amazon.co.uk/Suwimut-Flexible-Training-Activity-Basketball/dp/B097PM736F/ref=sr_1_15?crid=SD87ZBZWA6NW&dib=eyJ2IjoiMSJ9.Un9uyLddcefvvNxpqxFoPm52GjgjR43MJu0W-nWkqfyrCElDYc2LMcNFcB4VoP_8-VlZ5u9zfoJBviy2jrDUwR-SM7DpLCzrqMOO1ELhv3yApyMzJ5QlOQNye9Zpocbmv41X7kfVRWo2axlynSJ8G6I4ri4Rsonv6o9PsbqR4xmN7ARNVegBS0n4qktcbsGLrb7zaZ2tjBXAjbZx_mWxLzm0_g7zy3c1rjSuusuolTc8cdLV2lZOSZMYciMyHN0fIo_E93e6G8Tx_cPraamEDBW1PZn4rJWzgRiiw4OQxp7vg1JfM9yvtUilJwqaOcJ1ZD70kyrviGJXoH8jqYw9PD45s8hypYeefoFWXcH45cLwfCPILE43Uga8hkqCkWOP68kLhw5Uuht6aXnVBwlvL1YcmDckr_VRMU-LPHeZR5TJ6VWtFCAxQGjhcps1rQqm.NyZU2Q4t5vmuqSljTw8nAMcHzTuaQPu_5uUXlaS2mpk&dib_tag=se&keywords=plastic+cones&qid=1743431284&sprefix=,aps,163&sr=8-15
I'm reminded of B&W's Prism technology:
"The back wall of the speaker enclosure is entirely covered with long plastic wedges. These break up standing wave patterns between the front and the back of the box, patterns that otherwise would emanate through the woofer cone and result in interference with the direct sound. Or in severe colourations, if you want. The Prism wedges are meant to be most effective in the critical range centered around 1-3 kHz, where the human ear is most sensitive."
"The back wall of the speaker enclosure is entirely covered with long plastic wedges. These break up standing wave patterns between the front and the back of the box, patterns that otherwise would emanate through the woofer cone and result in interference with the direct sound. Or in severe colourations, if you want. The Prism wedges are meant to be most effective in the critical range centered around 1-3 kHz, where the human ear is most sensitive."
The wedges will be soft foam, not hard shiny plastic - shiny surfaces reflect high frequencies a lot. So no, not those plastic cones... Better off with a hot-wire cutter and some upholstery or acoustic foam?
Rear view of B&W DM302 prism technology speaker:
Since the "plastic wedges" are moulded or cast into the speaker's back panel, I would assume them to be hard plastic.
Since the "plastic wedges" are moulded or cast into the speaker's back panel, I would assume them to be hard plastic.
The identical dimensions of the training cones shown in your link may result in them only being effective over a narrow range of standing wave frequencies.
Note that the differing length and orientation of the wedges in the prism speaker results in them being effective over a wider range of standing wave frequencies.
However, it would be still be an interesting experiment to fill the training cones with absorbent as you suggest and attach them to the back panel of one speaker in order to compare the result with the other, unmodified speaker.
If you decide to have a bash at this, do let us know your findings. Could be fun!
