Hi.
I get what looks like a "resonance phenomenon" when doing near field measurements on my speakers (both speakers). The wrinkle on the graph is visible around 48Hz, both when I measure the port and the speaker element. When I block the port, the wrinkle on the graph is still visible, but it's not as pronounced. See attached pictures.
The baffle is 22mm thick and the edges of the holes are not chamfered.
Does anyone have an idea what could be causing this, which I believe is a resonance?
All ideas are welcome!
I get what looks like a "resonance phenomenon" when doing near field measurements on my speakers (both speakers). The wrinkle on the graph is visible around 48Hz, both when I measure the port and the speaker element. When I block the port, the wrinkle on the graph is still visible, but it's not as pronounced. See attached pictures.
The baffle is 22mm thick and the edges of the holes are not chamfered.
Does anyone have an idea what could be causing this, which I believe is a resonance?
All ideas are welcome!
Attachments
Are you sure it's not a room related problem?
Please, post Waterfall, you should see a loooooong decay if it's from your electricity.
Please, post Waterfall, you should see a loooooong decay if it's from your electricity.
I moved the speaker to another location and took the same measurements. The wrinkle on the graph is a bit smaller, but it remains in exactly the same place (48Hz). It makes me think that AllenB may be right and that it could be interference from our mains.
Attachments
My guess is that you have a seriously bad ground loop between your equipment, for example PC/audio interface and amplifier, or any 2 pieces of gear that are both powered via a grounded AC plug. You might look into breaking the loop in one way or another.