LF cut-off

[Mallick]

I am doing the sweep to measure the freq response of my speaker which is 2way system, but my freq is limited is 100Hz and not below, I tried the following.

1. Mic calibration file installed in REW
2. Tascam 366 calibrated and found linear
3. Both loopback and timing levels are ok
4. SPL level was calibrated by an external SPL meter
5. All filters in Soundcard was bypassed
6. All filters/tone was bypassed on the amplifier
7. Loopback as ref was check in
8. Use main spks test signal to test levels
9. Freq range set to 10Hz to 20KHz

I am almost given up on ideas from my side, need more experienced guys to help me.

The graph doe not show any filter roll-off but an abrupt cutt below 100Hz, I am missing something basic?

Thanks guys in advance.

Mallick

 

[John Mulcahy]

You probably have a 10ms right hand window width, which is setting the LF limit.

 

[Mallick]

You probably have a 10ms right hand window width, which is setting the LF limit.

Hi John,

Thanks for the quick solution, missed to see thise options.

I saved it as a preset to recall later but one question.

Cant we set it as a default setting for all new measurement? seems to change on every measurement.

Tks Mallick

 

[John Mulcahy]

You can set default windows in the Analysis preferences.

 

[Mallick]

works all set, tks