tweeter frequency response drops rapidly but not single

[testitbinit]

Hi
Trying to understand an observation of a frequency response measurement I have made. When measuring a speaker with a single woofer and two tweeters the measurement shows a total fall off from 10khz and up. If i measure just one side either left or right the response is fine, no drop. In normal use the speaker sounds fine, no audible phase issue and the highs are fine. what can cause this issue between two tweeters at this frequency? my other speakers measure fine.

 

[voodooless]

What exactly are you measuring, what are you measuring with and what is your physical setup? Any pics, screenshots and specs?

Two tweeters in one speaker sounds highly suspect..

 

[testitbinit]

its just a portable speaker. just trying to measure its frequency response. im using an omni mic and dayton audio software.

 

[jonfitch]

I think Axiom speakers like the M80 used to have multiple tweeters and so do some of the Sonys. Does cause losing at some angles.

 

[voodooless]

its just a portable speaker. just trying to measure its frequency response. im using an omni mic and dayton audio software.

I’m guessing those are not two tweeters, but two wideband speakers and one woofer for some bass. Usually those wideband units will be beaming high up, so measuring off axis will show some drop off. Try measuring close to one of them exactly in front. Also close proximity of the two will cause quite some comb filtering. Shifting the mic a bit will then yield quite a bit different response. Your ears mostly filter this out, also because of lots of indirect room reflections.

 

[testitbinit]

yeah i tried moving all all around, up down to the side. result was the same. didnt look like comb filtering, just a steep drop from 10khz. playing just left or right channel and response was fine, extended towards 20khz.

 

[voodooless]

So what is the device we’re talking about?

you could try creating a barrier between the tweeters while measuring one of them in stereo mode, see if that gets the full spectrum back?

 

[testitbinit]

its a jbl xtreme speaker. will try the barrier, thats a good idea.

 

[Andysu]

Pictures please no a video would be better.