Hi All,
How do you measure bust decay? what are the best practices?
I am using a measurement mic and the REW Spectrogram tab set to burst decay.
I am measuring indoors. (probably a red flag)
I have tried measuring at 50cm, the burst decay is full of noise from room reflections,
I have tried measuring at 5mm from dust cap, there are no resonances visible (I'm pretty sure the enclosure has some resonance)
I have tried measuring at 5mm from the side panel, room reflections dominate the signal and no resonances are visible through the noise.
Do I need an anechoic chamber or an NFS to do this? or is there a clever way of doing it indoors? I have also considered buying one of those portable power station things and taking the measurements in a park, away from all reflective surfaces. The last option doesn't sound very fun, especially as I am trying to compare 4 enclosures using the same drivers so I will be pulling speakers apart in a park...
Thanks in advance for your help,
How do you measure bust decay? what are the best practices?
I am using a measurement mic and the REW Spectrogram tab set to burst decay.
I am measuring indoors. (probably a red flag)
I have tried measuring at 50cm, the burst decay is full of noise from room reflections,
I have tried measuring at 5mm from dust cap, there are no resonances visible (I'm pretty sure the enclosure has some resonance)
I have tried measuring at 5mm from the side panel, room reflections dominate the signal and no resonances are visible through the noise.
Do I need an anechoic chamber or an NFS to do this? or is there a clever way of doing it indoors? I have also considered buying one of those portable power station things and taking the measurements in a park, away from all reflective surfaces. The last option doesn't sound very fun, especially as I am trying to compare 4 enclosures using the same drivers so I will be pulling speakers apart in a park...
Thanks in advance for your help,
Well the closer to the speaker the greater the signal to (room) noise ratio, but that only sees emanations from the cone, not the box. For the box its not loud enough compared to the room reflections I suspect and anechoic chamber or free-space is needed (i.e. hang it from a crane in the open!)
For the box resonances you might get some useful info using a contact mic on the box panels, that ought to up the SNR...
For the box resonances you might get some useful info using a contact mic on the box panels, that ought to up the SNR...