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  1. #1
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    h66000 h9900 h4365

    A member asked for the raw data curves for the horn/driver combinations in the Everest II, K2-S9900 and 4365 so here they are.
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    Guido, here's what I got in LEAP substituting in a 1500AL for a 1501AL. These are starting values with optimization set at the knee of the curve so that the proper crossover frequencies are maintained. This results in a slight decrease in voltage drive through the passband, as you mentioned.
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    The dark curves are the target curves using a 1501AL and the light curves are the result of the above values along with the 1500AL. LEAP wanted to put in less shunt resistance so I put in the values I wanted and took them out of the optimization. The values LEAP wanted took too much of a hit in efficiency. (e.g. 18 ohms on LF2 instead of my chosen value of 33 ohms. Interestingly, when I went over this years ago using BB6P it also wanted to put 12 to 18 ohms across that woofer. My opinion is that's too much of a cut.
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    Here are the impedance curves. The actual Everest II 1501AL curve is the light one.
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    Ok, here is a better set of curves. The light gray curve is the 1501AL in the Everest II box. The blue curve is a 1500AL in my personal 5 cu ft (gross) @ 28 Hz box and the red curve is a 1501AL in my personal 5 cu ft (gross) @ 28 Hz box. When I have time I'll run the simulations on these last two curves instead and see what values LEAP comes up with. I don't have time to play with it further tonight.

    You probably don't want the dual drivers dipping below four ohms so you might need to use slightly higher DCR in your coils to make sure that doesn't happen?
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  6. #6
    Senior Member Guido's Avatar
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    Thanks for this awesome work Giskard!

    I'll have a closer look this weekend and add what I find (or not ).
    I also work on it but your input is higly appreciated.
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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    Senior Member Guido's Avatar
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    Thanks for this information about the GT active crossover.
    I'll have a look at it when I find the time.
    The last weeks I tried to refine the passive network in LEAP. I'm done at the moment and can't continue until I have the real thing here. Looks like a 99dB design and impedance is not lower than 3.6 ohms. The implementation of the 045Be isn't that problematic. The UHF will slightly roll off to 3 dB down between 20 kHz and 50 kHz. I'm not really worried about that

    I'm sure your 1500AL/476Be/H4338 design sound wonderful. I already have a 1x1500AL + 2435 + H4338 design since 3 years now, remember?

    This time the 2 woofer setup is a given as the EV2 cabinets are already in production.
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

  8. #8
    Senior Member Guido's Avatar
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    Giskard, let's continue here

    I want to refresh this thread as my EV2 cabinets will be here in september/october and I need to lift my a$$ now and build prototype networks to be refined in use with the actual speaker.

    Giskard, when converting the schematics from 1501AL to 1500AL, what DCR's did you use?
    E.g. the two 10mH subwoofer coils together are 1.3 ohms in the original network.

    The mod network use only one 10mH coil. 0.65 ohms? 1.3 ohms?
    Same for all othe coils.

    What do you think
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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