Measuring the SPL of loudspeaker at home.

[Pano]

The only "minor" issue is that they are a little bit sharp in high region.

Do you have level controls on the crossovers? Simply turning the tweeter down a bit could help. And titanium can have nasty breakup modes, that may be what you are hearing.

 

[a.wayne]

Better to control tweeter resonance Pano , damping helps but may mush up everything . i would like to see impedance magnitude , the ringing should be present here and he can control from xover ...

 

[Pano]

Yes, a trap on the tweeter could help. Let's wait to hear how the treatment goes.

 

[RamJBL]

OK. I brought the speaker in the middle of the room. And this is the response I got!!!

 

[ghemml]

Sorry I'm a noob in using HOLMImpulse, where do you get the cursor and how to set the delay from the 1st impulse?

 

[RamJBL]

Sorry I'm a noob in using HOLMImpulse, where do you get the cursor and how to set the delay from the 1st impulse?

I found this link very helpful:

A HOLM starter guide
A HOLM starter guide

 

[RamJBL]

Do you have level controls on the crossovers? Simply turning the tweeter down a bit could help. And titanium can have nasty breakup modes, that may be what you are hearing.

I have L-pads, and they help a bit, but not quite.

Better to control tweeter resonance Pano , damping helps but may mush up everything . i would like to see impedance magnitude , the ringing should be present here and he can control from xover ...

I heard Greg Timbres have said, coating the dome of these Ti tweeters, removes the "zing" out of them and should tame them.

See here:
https://www.google.ca/search?q=JBL+...woH4Aw&ved=0CAkQ_AUoAQ&biw=1097&bih=581&dpr=1

How can I measure the impedance magnitude?

 

[Pano]

OK. I brought the speaker in the middle of the room. And this is the response I got!!!

To me the midrange looks hot and then you have some trouble around 7.5K. Wonder if that is driver or crossover related? Guess the only way to tell is now to measure the drivers solo.

Thanks for doing all the work and posting here! We'll figure out something yet. 🙂

 

[Pano]

Oh, one more thing. I see a lot of hard surfaces. Bare walls, fireplace, wood floor. The wood and brick can sound OK, but in combination with the bare walls may lead to a harshness you are hearing. I had to treat my walls like crazy to avoid that. Still have a little ring left.

 

[ghemml]

I found this link very helpful:

A HOLM starter guide
A HOLM starter guide

Thanks, HOLM looks much easier to use compared to ARTA.

This is what I got from ARTA using Near-Field(LF Diffraction), Far-Field and then combine them. I see if I can get the same results with HOLM, and figure out if my ARTA's jig can be used on it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Pano]

How can I measure the impedance magnitude?

You'll probably need some dedicated hardware to do that. Either a woofer tester or a jig to use with software. The impedance can be plotted by hand, but it's tedious.

 

[RamJBL]

Thanks for doing all the work and posting here! We'll figure out something yet. 🙂

I have to thank you for the help. 🙂

Oh, one more thing. I see a lot of hard surfaces. Bare walls, fireplace, wood floor. The wood and brick can sound OK, but in combination with the bare walls may lead to a harshness you are hearing. I had to treat my walls like crazy to avoid that. Still have a little ring left.

I totally agree. How do you suggest I treat the walls?

 

[RamJBL]

You'll probably need some dedicated hardware to do that. Either a woofer tester or a jig to use with software. The impedance can be plotted by hand, but it's tedious.

Can't one simply use the factory measurements?