LR reverse null axis

[gainphile]

For the purpose of developing time-aligned LR xo, where is the best place to measure and check the reverse null?

- At tweeter axis, 1m
- At midrange axis, 1m
- At ear/listening height, 1m
- or at listening position?

[jimangie1973]

Originally Posted by gainphile

For the purpose of developing time-aligned LR xo, where is the best place to measure and check the reverse null?

- At tweeter axis, 1m
- At midrange axis, 1m
- At ear/listening height, 1m
- or at listening position?

Is this a 2 driver two way? If so, set the mic 1m from the baffle directly between the center of the two drivers. MTM is a little harder because you have to put the mic at the tweeter axis, then account for the distance between tweeter and mid woofers.

[jerome69]

- At tweeter axis, 1m
I have used to measuring like this and I'm happy with the result.
I consider the tweeter very directive and I measure at the tweeter height.
The reverse of the midrange of my big OB and the result is convincing


- At midrange axis, 1m
I never use this.

- At ear/listening height, 1m
Not easy to do. The height of the sit is very variable. And people don't have the same height.

- or at listening position?
Could be done only to measure the response but I think too much reflection to see a deep suck.

[ttan98]

Hi,

Do you necessary trying to to achieve/get a deep null in FR curve when the driver is connected in reverse? In some cases when you connect the drivers in correct order there a dip at the X-over frequency. I think some people will get, is this a more suitable response? or one should try to get a flatter response(not a bigger dip at x-over frequencies) when the measuring OFF-axis FR curves measurements ie horizontal and vertical dispersion measurements should do not deviate too much from on-axis measurements. I use this approach I am happy with the sound. I think this area should be discussed further.