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3-4 dB dip at crossover region: what should I listen for to hear it?

I haven’t posted here for about 10 years but thought I’d jump back in to ask about my new JBL 4349s. According to measurements on ASR and even JBLs own graphs, the 4349s have a 3-4 dB dip in the crossover region at about the 1.5 kHz mark. What should I listen for to hear this? I understand that music in this range will be quieter, but I’m not hearing any suckout compared to my Omegas or other speakers Ive had in my system. I’ve played some clarinet and violin concertos, two instruments that spend a lot of time in this frequency range, but I can’t hear an obvious difference. Am I listening for the wrong thing? I’d like to be able to hear this deficiency for leaning purposes if nothing else, so any pointers are appreciated.

 

Many thanks!

rischa
rischa OP
64 posts
 

@toddalin, thanks, I will listen for this and compare with my other speakers. Can I ask what you mean by "overtones"?

jheppe815
59 posts
 

@rischa - I remember distinctly how good the 4349's sounded right out of the box.  However, the high frequency compression driver did smooth out in short order as the drivers broke in.  I didn't have a very long break in period where the cabinets sounded vastly different, though I put quite a few hours on right away.  I run JBL 2269H 18" drivers as subs, so low frequency extension or break in isn't something I could comment on.

As I work for an AV company, my business partner came to audition the system as well and we used a calibrated mic and software to see what was going on in the room.  Both of us were very aware of the various graphs that have been published showing that 1.5k dip and we wondered if we could hear that.  There is a slight (and very slight) downward curve in the 1800 to 2200 hertz area on the graphs as we measured the room / system, but of the various people that have heard the system (all of them musicians and all of them with very good systems better than mine), no one has stated "hey, what's with the dull / flat vocals" or anything like that.  I'm certainly not grabbing for my 1k or 2.5k eq knobs on my preamp and boosting those frequencies.  I find these cabinets very enjoyable and have no want to get rid of these for something else.

I have a second system with reasonable components and as I go back and forth between systems, I don't find the 4349's severely lacking in any way.

oregon
807 posts
 

Wow.

I agree with Corelli. 

timlub
2,039 posts
 

1500 is upper midrange. If you do a search for frequency chart of musical instruments,  you should find what you are looking for.  Erik,  I have built using buttererworth, bessel, linkwitz riley and chebyshev. I believe that you were looking for bessel,  this has a very smooth impulse response and I agree with you, I suspect the designer was most likely dealing with some other issue that they used this dip to deal with it. 

toddalin's avatar
toddalin
167 posts
 

The range in question is above the fundamental pitch of most singers and it is the overtones that add "brightness" to the sound.

Perfect example. Listen how her voice (maybe guitar too?) is a bit more "laid back" with the JBLs.

 

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