Not too bad
Pink is LEAP simulation of original EV2 (w/o UHF)
Blue is 1500AL mod giskard post #2 plus MF with 7.5 ohm series resistor and 0.4uF bypass.
What do you think?
Not too bad
Pink is LEAP simulation of original EV2 (w/o UHF)
Blue is 1500AL mod giskard post #2 plus MF with 7.5 ohm series resistor and 0.4uF bypass.
What do you think?
Same as you, not too bad.
You'll need to sub in your own measurements at some point though.
You also might want to do as Tim suggested and simply transpose the values instead of using LEAP's optimization function like I did. Multiply the capacitors by 1.65 and the inductors and resistors by the inverse. What I did was copy the "system curve" voltage drive generated by the stock network over into the "guide curve" section and then used that curve as the optimization curve after substituting in the 1500AL impedance. I changed the acceptable dB deviation from the default 1 dB to 0.1 dB and obtained the results shown in post #2. In the end it is going to boil down to your specific impedance curves in your specific boxes along with your specific coil DCR's.
Here are my 1500AL and 1501AL impedance curves measured in the box shown. 5.0 cu ft @ 28 Hz
Thanks guys.
To the innocent bystander this is still very interesting and educational thread-even at the basic level, the left to right sequential treatment of compensation then notch eq's has for the first time allowed this thick head to understand a xover diagram.
Of the 3 horns in question the H4365 is one I'm not familiar with-is this the modified one closest to the SAM1?.
Cooky
Used in the new $9,500 monitor Greg did right after the $22,000 K2-S9900. The LF transducer has a cloth surround like in the good old days.
http://www.harman-japan.co.jp/jbl/hifi/4365/
Greg is a serious advocate for the vertical horns and the SAM1/1400 Array horn is that horn of choice.
Removing the L9 / C8 / R11 notch filter:
Removing the L7 / C6 / R10 notch filter:
Removing R9 / L6:
Guido, don't forget about the switchable 120 ohm resistors Greg added in on the 1501AL's for a bit of flexibility.
You'd probably want something on the order of 75 ohms for the 1500AL's.
You also asked about the 045Be... the voltage drive should tell the tell. It's a very nice driver though.
You'll notice that the H4338 is horizontal in the photo of the box above? Let's just say that Greg isn't impressed.
But I wanted a couple of "Studio Monitor" boxes with blue baffles and a 1500AL & 476BE/H4338 two-way was a good excuse to make a pair.
I'll do the vertical thing too someday.
You are bloody fast. I will be able to look into it tomorrow or wednesday. I'll do a bit more "Leap"ing.
Thanks for the real DCR values. These are not in the tech sheet. My guess of the coil DCR for the high woofer and some notches where spot on I see.
I hear the woofers are on the way Thanks!
Attached Files
- HF_Impedance.txt (9.9 KB, 9 views)
- HF_FMP_corrected.txt (19.5 KB, 6 views)
- LF_FMP.txt (20.4 KB, 6 views)
- LF_Impedance.txt (9.9 KB, 5 views)
What is an FMP file??
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