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Thread: 3 ways to climb Everest

  1. #121
    Senior Member ivica's Avatar
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    Quote Originally Posted by Brian DK View Post
    And again.. Why a lower resistor to lower the output level?
    Should it not be a resistor with higher value.?
    Hi Brain DK,

    The influence of the 'shunt-resistor' can be calculate using the following formulas:

    if with Ro we denote 'serial resistor' and with Rs we denote shunt resistor, and if with Rd we denote the driver resistance the
    the voltage response Av on the driver (neglecting ALL real and equivalent capacitors and inductors) would be:

    Av = 1 / [ 1 + Ro*( 1/Rd +1/Rs)]

    so from here as Rs become smaller 1/Rs become LARGER, so the products Ro*( 1/Rd +1/Rs) become larger, and Av become smaller.

    Such formula become much more complicate if other elements of the network are included, especially if equivalent impedance and the response of the driver are included too. In such situations some computer programs has to be used..

    regards
    Ivica

  2. #122
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    For those who have been reducing the output of the lower bass woofer on the Pass xvr1 crossover.... I was forwarded this from the great master.

    2nd order. You need to set the second bank of the crossover to X1 and Out, the slope switch to 6/12 and set the Filter Q switch to L
    There are 3 configurations to try.

    Config #1 is 106 Hz, 106 Hz and X1
    Config #2 is 106 Hz, 133 Hz and X1
    Config #3 is 133 Hz, 133 Hz and X1

    In all cases, the LF1 voltage and LF2 voltage should be the same (at about 50 Hz). Adjusting the roll off point of the outer woofer will adjust the mid-bass region which has been too prominent when the woofers were set to the same voltage. I think one of these three settings should work much better.

    You can try the Filter Q at M, but I don’t think it will work as well as L. You want to concentrate on the main crossover point for setting the relative levels of the HF and inboard woofer and then play with the settings for the outboard woofer. I think the output level will change slightly with each different configuration, but not a lot. Big changes come if you change the Q or the degree of crossover (6, 12, 18 dB)

  3. #123
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    Pic
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  4. #124
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    I went for config 1

  5. #125
    Member jbljfan's Avatar
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    X-over settings

    Thank you for posting the updated information.
    Active systems since eighty three.

  6. #126
    Senior Member Doctor_Electron's Avatar
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    Frostbite !

    Quote Originally Posted by vivaregina View Post
    In short, I stopped thinking about the audio and really enjoyed the music.

    Try the Miles Davis Kind of Blue, first track, 8th minute, when the bass starts playing a little rhythm.

    My ears are bleeding but I can hear everything.
    Ear bleeding could be caused in part by listening at 25,000' + altitude.

    I'd bet you had some help from Sherpas in transport and positioning.

    Since you mentioned Miles, I would like to suggest a piece of music that think you would really dig.

    From the Billy Cobham LP/CD "Warning", the tune "Mozaik".

    I have it on the CD GRP Digital Sampler #2 (GRP Jazz). Catalog# GRP-D-9529 - Produced by Dave Grusin and Larry Rosen.

    Don't know if it is available on Vinyl. The sound quality, dynamics et al. on the CD are outstanding ++

    All tunes on this disc are great Jazz.

    I have a .wav of Mozaik, 54.4 MB, if there is a way to get it to you via the 'net. My burner won't burn! What a burn!

    Regards, -de-

  7. #127
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    Below is the latest clarification from our man. This is the one you should follow.

    For each pole (1 thru 4) there are 2 out settings. On poles 2, 3 and 4, you should select both out positions for the two jumpers.

    On pole 1, select the frequency (106) and X1 which is the multiplier. In this case 106 Hz x1 = 106 Hz.

  8. #128
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    Previously I did not match the voltage on the lower woofer to the mid woofer as it was too much bass on 133 and 106. It was on around 50%.

    I am trying to match the voltage now, and having tried every setting on the way down, I ended up with the inside of the xvr-1 is on 59 for pole 1 & 2.

    Have fun trying yourself as everything is easily adjustable on the xo.
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  9. #129
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    Quote Originally Posted by vivaregina View Post
    Kiwame Carbon Film resistor.
    The sound is smoother, less nervous around the 2k Hz region.
    Previously it was a little more metallic, more glare.
    I was skeptical before the change, but I heard it on the 2nd pair, and went for it.
    I would say the change improved the character of the speakers.

    Attachment 54765
    very interesting..
    will the horn Sound even more smoot, if all the
    Resistors ind the horn X-over is changed to Kiwarme Carbon film?

  10. #130
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    In case anyone want to upgrade their network to 67000 as a diy build.

    If you keep your original set, you can compare.
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  11. #131
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    The good news is that, according to some folks, you don't need to charge-couple the capacitors so you can DIY a pair of DD67000 networks that are substantially less expensive.

  12. #132
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    You mean take out the diodes !

  13. #133
    Senior Member grumpy's Avatar
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    Diodes? We don't need no stinkin' diodes!

    l'm assuming there was intended humor a couple of posts back...

    If someone carves up networks in a factory DD67000 expecting improvments
    they may deserve what they get.

  14. #134
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    Quote Originally Posted by grumpy View Post
    If someone carves up networks in a factory DD67000 expecting improvments
    they may deserve what they get.
    I'm pretty sure that the price of admission keeps the riff-raff out?

    Quote Originally Posted by vivaregina View Post
    You mean take out the diodes !
    More than just the diodes and I won't detail the rest given that charge-coupling absolutely makes a positive difference despite all the flak from the naysayers sporting obviously compromised auditory mechanisms.

  15. #135
    Administrator Mr. Widget's Avatar
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    Sorry OT

    Quote Originally Posted by 4313B View Post
    ....sporting obviously compromised auditory mechanisms.
    Oh! Where can I get those for my system?


    Widget

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