Something is wrong with my spkr

[kgveteran]

My WTMW speaker is sick, it has a dip around 360hz, almost 10db deep. Its the speaker pictured in that build thread here. The dip is between 150hz and 800hz……XO points 400hz and 1.8khz

I measured using my omnimic which im slowly relearning my way around the program.

Any thoughts ? Questions ?

I’ll try to post a graph

[JonMarsh]

Questions, yes... this isn't enough info to begin to help.

• Is this a known design provided by someone, or your own effort?
• Was it working previously OK, or just measured recently and the problem discovered?
• What does the crossover schematic look like? And what drivers are used in the system?

You see, you haven't told us enough to know whether this is a design problem you are having and just discovered, or if this a known design with documented performance characteristics that has developed a failure of some kind, like a defective solder joint or capacitor or driver...

To help you, we need the above information plus a measurement of how the speaker is currently functioning, or rather, not functioning. And keep in mind that if the crossover has shallow slopes, if the midrange driver opened up, it would look like a big dip at the center of the midrange bandpass, with fill in on each side from the woofer and tweeter due to their roll off slopes.

[wolf_teeth]

https://www.diyaudio.com/community/t.../#post-6963825

Wolf

[kgveteran]

Im so sorry i dropped off, please accept my apologies.
I have a few sets of graphs i would like to post but i get the to post ???

[kgveteran]

Thanx wolf

[technodanvan]

If you're having issues attaching an image I understand completely, it isn't as intuitive here as it is at some other forums. When you 'go advanced' when posting this is the button you should use. It'll bring up a popup window where you can upload images and insert them in your post. Of course be sure your browser isn't blocking the popup window - a lot do that by default anymore.



In any case, looks like you're getting some good suggestions from the folks at DIY Audio. Am I correct in seeing:

1. Four of the six woofers having a dip at 800 Hz? These were measured all in the same location, right?
2. Two of the mids almost look like they aren't being crossed over to the woofer (i.e. only one has the dip at 150Hz.)
3. The tweeter plots look odd to me. I'm not an expert (nor am I a designer) but something is clearly wrong.
4. None of these plots appear to add up to the 400 Hz dip you have for one speaker as a whole. Maybe the one exception being that tweeter plot?

Hoping one of the guys with more experience comes along to evaluate further. Glad you're getting some help though!

[kgveteran]

If you're having issues attaching an image I understand completely, it isn't as intuitive here as it is at some other forums. When you 'go advanced' when posting this is the button you should use. It'll bring up a popup window where you can upload images and insert them in your post. Of course be sure your browser isn't blocking the popup window - a lot do that by default anymore.

[ATTACH=CONFIG]31989[/ATTACH]

In any case, looks like you're getting some good suggestions from the folks at DIY Audio. Am I correct in seeing:

1. Four of the six woofers having a dip at 800 Hz? These were measured all in the same location, right?
2. Two of the mids almost look like they aren't being crossed over to the woofer (i.e. only one has the dip at 150Hz.)
3. The tweeter plots look odd to me. I'm not an expert (nor am I a designer) but something is clearly wrong.
4. None of these plots appear to add up to the 400 Hz dip you have for one speaker as a whole. Maybe the one exception being that tweeter plot?

Hoping one of the guys with more experience comes along to evaluate further. Glad you're getting some help though!

Thanx Dan! I will load up the images later. Since you looked at the graphs already, the two cabinets that measure fine at the LP are all the same, the center cabinet every single driver has a wonky :0) response or at least different from the other two that measure ok.

[kgveteran]

here are the close mic sweeps, again, im just looking to see if theyre all the same and clearly the one cabinet is different from the other two. these speakers are the ones in my avatar

[kgveteran]

Im sorry about all the different colored graphs, i never thought of doing matching colors for each speaker.

If you look at the tweeter response, and the mid response of all three of each cabinets, the tweeter and mid that dont line up are in the cabinet in question

[kgveteran]

Looking at the six woofers, the two graphs that dont match are in the same cabinet, the other four are close enogh

[kgveteran]

Questions, yes... this isn't enough info to begin to help.

• Is this a known design provided by someone, or your own effort?
• Was it working previously OK, or just measured recently and the problem discovered?
• What does the crossover schematic look like? And what drivers are used in the system?

You see, you haven't told us enough to know whether this is a design problem you are having and just discovered, or if this a known design with documented performance characteristics that has developed a failure of some kind, like a defective solder joint or capacitor or driver...

To help you, we need the above information plus a measurement of how the speaker is currently functioning, or rather, not functioning. And keep in mind that if the crossover has shallow slopes, if the midrange driver opened up, it would look like a big dip at the center of the midrange bandpass, with fill in on each side from the woofer and tweeter due to their roll off slopes.

Gotcha, its the WTMW threeway center designed here at the HTguide, (the pic of three gray identicals are mine), back in 2005ish, there were three
XO designs submitted , i picked Curts XO 400hz/1.8kh, you submitted one too i think

[kgveteran]

Update: i swapped woofers from one cab to the other and the woofers are fine, the XO has issues, i gotta pull it out….