JBL 2235h vs. JBL E-145

[more10]

"Thanks for sharing?" I will assume that wasn't intentionally rude sarcasm.

http://www.lansingheritage.org/image...est/page10.jpg

You are right.

I was referring to the comparison by Dr. db.

My English isn't good enough to realize it even could be interpreted as sarcasm :-)

[Mr. Widget]

You are right.

I was referring to the comparison by Dr. db.

My English isn't good enough to realize it even could be interpreted as sarcasm :-)

Dont worry... many of us native English speakers don't have a very strong use of the language either!


Widget

[grumpy]

Indeed. Apologies for bringing it up.
That particular phrase has been so frequently abused
in a sarcastic sense (here) that it was difficult for
me to interpret differently. Happily, the conversation
continued productively in spite of me

[more10]

Apologies for bringing it up.

Not needed. Thanks for teaching me! This outcome is much better than you believing I am a rude sarcastic prick.

[Dr.db]

Copying ivica´s pic....

...and comparing frequency response with the JBL 4560 enclosure:
http://www.jblpro.com/pub/obsolete/L...nclosures2.pdf

I get really confused


Pertaining to ivica´s simulated bassreflex-response, their is an obvious increase in the midrange of 6-7db... and this is the simple bassreflex.
Looking at the 4560`s freq.-response, it does not seem to differ a lot! It clearly shows the increase of the short frondloaded horn of ~6db from about 200hz.... but that´s it!

Wouldn`t you think that the natural midrange-peak would add up with the hornloading increase and should result in something like +12db from 200hz up....!?

[Robh3606]

Pertaining to ivica´s simulated bassreflex-response, their is an obvious increase in the midrange of 6-7db... and this is the simple bassreflex.

The midband response is what the sensitivity is based from and where you would match driver sensitivity. That graph is misleading. There is quite a difference in bass roll-off between the 2 drivers compared to their midband sensitivity. The E-145 has considerably more roll-off in comparison. From my point of view that's not midrange rise with the E-145 it's low end roll-off. FWIW

Rob


http://www.audioheritage.org/vbullet...-E145-8-150-4H

[Dr.db]

I got you

But on ivica`s bassreflex simulation it looses about 9db from 200hz towards 800hz


On JBL`s paper it is pretty flat from 100hz to 800hz, maybe 2-3db peaks/dips...
http://www.audioheritage.org/vbullet...-E145-8-150-4H

[ivica]

I got you

But on ivica`s bassreflex simulation it looses about 9db from 200hz towards 800hz


On JBL`s paper it is pretty flat from 100hz to 800hz, maybe 2-3db peaks/dips...
http://www.audioheritage.org/vbullet...-E145-8-150-4H

Hi Dr.db,

But please read the rest of the post:
"...Here "expectable" behaviors of 2235H and E145-8 in the 5cf box, tuned to 30Hz and 40Hz (as explained).
Here 2.5mH and 40uF low-pass filter applied, and 10Veff voltage source......"

1. JBL data (looking at the Impedance curve) were shown for the CLOSE BOX ( about 10cft) with the resonance peak around 50Hz.....
2. More flatness can be get if Fb=60Hz, where expected -3dB can be around 61Hz ( compared to 2235H where -3dB would be around 37Hz .....)

Here some simulation data (neglecting drivers sensitivity) WITHOUT external passive networks

Regards
ivica

[Dr.db]

@ ivica


Thanks soo much!!
Stupid mistake, I must have overlooked your description.
Thanks a lot for correcting me although I did not read your posts intent enough.


Now all the graphs line up and make sense to me, thanks for your help guys!


Ps. Which programm did you use for simulations ?