Help interpret JBL K2 S5800 data from Lansing Heritage forum

[killitmore]

Hi all, I found some datasheet of JBL K2 S5800 from Lansing Heritage forum. I'm trying to interpret potential issue with this speakers.
Hoping someone who are familiar with data can help me.

Based on these pictures. I'm only sure that the distortion looks good but I cannot interpret info related to its frequency response.
Thank you for your help!!!

 

[NTK]

The middle plot is the standard CTA-2034, aka spinorama, plot, shown below in the right orientation. The DI curves (the bottom 2 curve) are a bit bumpy. Ideally, these 2 curves should be smooth and the rise of the curves should be monotomous. The curves on the top, in particular the 2 top ones (on-axis and direct, which I guess meant listening window), should be flat without bumps.

This directivity behavior is quite typical of the JBL's "legacy" designs before they decided to adopt Dr Toole's research findings on the proper speaker design targets. This speaker, as with many of JBL's horn based speakers, will probably sound dynamic with mediocre tonality, and will be bettered by JBL's more recents ones (with much better wave guides and compression drivers).

The same data of this speaker (from JBL, courtesy of Speakerdata2034) is also available at spinorama.org.

 

[kyuu]

While NTK is right that it's not great by modern standards, I'd put that frequency response squarely in the "not terrible" category. Particularly considering what the response of its peers at the time likely looked like. Although it's probable that the smoothing is hiding some sins.

 

[killitmore]

The dip around 1k seems to be due to crossover and cannot be remediated by EQ as there is a dip in DI curves as well. Apart from that, wiggles in the treble region can be fixed by EQ.
Is that correct?

 

[kyuu]

The dip around 1k seems to be due to crossover and cannot be remediated by EQ as there is a dip in DI curves as well. Apart from that, wiggles in the treble region can be fixed by EQ.
Is that correct?

That appears to be correct based on my reading of it, yes.