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View Full Version : What is the freq range of a LE-175?



Wardsweb
10-06-2003, 09:38 AM
Anyone have or know where I can find the specs on a LE-175?

4313B
10-06-2003, 10:12 AM
The LE175 is the same as the JBL 2410 (http://www.jblpro.com/pub/obsolete/2410.pdf)

Wardsweb
10-06-2003, 10:20 AM
Thanks ! Just what I was looking for. I'm in the process of adding the mid horn to my 2-way corner horns. So, need to determine the crossover.

Mr. Widget
10-06-2003, 01:55 PM
As you can see from the frequency plot, unless you are unable to hear above about 12KHz, you may want to consider a different driver or adding a tweeter.

The LE175 was considered full bandwidth in the early days of High Fidelity. Then along came the LP and high quality playback electronics.

Harvey Gerst
03-13-2004, 06:23 PM
The 175 was a decent driver back then, especially compared to some of its Altec counterparts. It was pretty decent out to 15k, whereas the JBL 375 dropped "like a rock down a well" after 9500Hz.

John Y.
03-13-2004, 06:48 PM
Harvey,

The fact that the 375 (or 2440) drops off so fast simpliifes the crossover to a 2405 since the roll off is so extreme. All you need is a good second order high pass on the 2405 and you are in business with a minimum of extra circuitry. Don't you think?

John Y.

Harvey Gerst
03-13-2004, 07:02 PM
John, you hafta remember I left before they introduced the 4 digit model numbers, so I don't know what that is.

Don McRitchie
03-13-2004, 07:09 PM
Harvey

The 2405 that John is referring to is the 077 slot tweeter that was an upgrade of the 075 bullet. I'm guessing you know what that was even though it was introduced after you left.

Harvey Gerst
03-13-2004, 07:27 PM
Yup, the 075 was designed by Bill Burton (who also designed the D123).

The 077 was Ed's redesign of the 075, using some of the slot-loading stuff Ed came up with when he worked at Fraiser-May in Texas, before he came to work at JBL.

rpstephen
03-13-2004, 07:34 PM
Would eliminating the bandpass on the 375 and running it out flat improve the sonics with the 075 driver in a paragon? Might have to move the xover frequency up to 9khz to avoid too much overlap. Also wonder if using the 077 diaphragm might extend the HF response with the 075.

Mr. Widget
03-13-2004, 07:54 PM
Originally posted by rpstephen
Would eliminating the bandpass on the 375 and running it out flat improve the sonics with the 075 driver in a paragon? Might have to move the xover frequency up to 9khz to avoid too much overlap. Also wonder if using the 077 diaphragm might extend the HF response with the 075.

Yes. It would improve the sonics. IMHO

It would be necessary to crossover at 9-10KHz.

The 2405 diaphragm would extend the response. JBL even made up some of these. They were sold on the "Tent Sale" as 2402-5s. (I believe that was the designation.)

Widget

scott fitlin
03-13-2004, 09:05 PM
Using the 077 diaphragm in 075,s has been done, with good success! It will extend the frequency response of the 075, but it wont change the beamy dispersion of the 075 tweeter. Yes you should use the 9K crossover point if you decide to do this.

Although I do like the bullet tweeter for a particular application, I tend to think that in home listening the narrow dispersion of the 075 might get annoying.

Jus my 2 cents!

:cool:

rpstephen
03-13-2004, 09:13 PM
Unfortunately, placement of the 075 in the paragon requires a narrow dispersion.

Harvey Gerst
03-13-2004, 09:19 PM
One trick George Augspurger and I came up with was to aim the 075 at the wall behind the speaker (yes, we took it out of the cabinet and turned it around). It help with the dispersion a great deal. In the Ranger cabinets, placement of course, is a lot more critical.

scott fitlin
03-13-2004, 09:20 PM
Originally posted by rpstephen
Unfortunately, placement of the 075 in the paragon requires a narrow dispersion. Ill agree with that.

Try the 077 diaphragms and the sound should have better extension. I have heard 075,s with 077 phragms and they do sound more delicate with better top end air!

:)

John Y.
03-16-2004, 09:41 AM
Originally posted by Harvey Gerst
One trick George Augspurger and I came up with was to aim the 075 at the wall behind the speaker (yes, we took it out of the cabinet and turned it around). It help with the dispersion a great deal. In the Ranger cabinets, placement of course, is a lot more critical.

Harvey,

Couldn't the 075 be aimed at the curved panel instead of direct line of sight to the listener. I think that was how the 075 was installed in the Metregon. Seems this would really improve the dispersion of the 075 in the Paragon without the losses incurred by aiming off a back wall. Just a thought.

John Y.

Harvey Gerst
03-16-2004, 10:12 AM
Yes, a curved panel would work fine. As far as losses, the 075 was probably the loudest device JBL ever made, and you could stand significant reductions in level without any problems.