four subwoofers help. HSU VTF-15H, MBM-12, VTF-2 MK4 , and Velodyne CHT-15

[andrewtungnguyen]

frequency sweep with subs only

subs and front speakers canton karat

subs only group delay

subs and canton karat group delay

 

[andrewtungnguyen]

i think i fixed it, i had an amazon box on the couch maybe causing the null at 90 . still there though

 

[Keith_W]

Please read this. Your post:

- does not have a question
- does not tell us exactly what you are measuring (4 subs together? both speakers together?)
- unsure if your measurements were taken properly

The biggest flaw I can see is that your subs are 40dB higher than your mains. But then you terminated your measurement at 100Hz so we don't know the rest of your frequency response.