Doing woofer measurements for crossovers

[Defo]

What is the norm here?

Should they be done in room with room gain?
In an anechoic chamber?
Outside?
Near field? Far field?

Wouldn't it be sensible to do them in a typical room with room gain, and design the crossover around that? In other words, tailor the crossover to the environment the speaker is meant to be used in. Especially with regards to BSC.

 

[bentoronto]

Of course you are right and right for all speakers. You set them up with no freq filtering and see how they perform on REW sweeps in your room (but not playing the treble speakers too loud of course). Then you can dial in whatever band-passing, time correction, phase adjustment, and EQ'ing you want with a DSP.... and most important that you never get with passive XO, the basic necessity of level adjustment.

You can't make sensible passive crossovers except for trivialized ("ideal") speaker models playing in anechoic rooms. Maybe not even then.

B.

 

[AllenB]

tailor the crossover to the environment the speaker is meant to be used in.

Whether to consider the overall power and adjust according to a response measurement at the listening position. This ignores important factors such as whether the reflections are wanted or not, their positioning, their timing. Power that is lost due to destructive interference.

It is sometimes thought best to measure the room at bass frequencies, and the speaker at higher frequencies. Can it be assumed that higher frequencies will have their behaviour designed into them, so that room behaviour is predictable? This reduces the uncertainty.