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Thread: Allen 2160A and Hauptwerk

  1. #11
    Administrator Admin's Avatar
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    Jun 2003

    Quote Originally Posted by NatePul View Post
    Is the schematic saying there should be a 20k resistor connecting the two wires at the end as well?
    Yes it is. It's to insure that the summing network is always seeing a minimum load impedance.

  2. #12
    ppp Pianississmo NatePul's Avatar
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    Jan 2018

    1 members found this post helpful.
    Well, I have my parts ordered now, and I'll post up here what the finalized connection looks like.
    -475 ohm resistors
    -20k resistors
    -RCA cables to run from my computer's interface
    -Y cables to take apart to create summing cables
    -soldering iron (I used to have one, but it got misplaced )

    I think I'm going to be using GrandOrgue instead of Hauptwerk, because you get the multi-channel outputs without having to pay hundreds of dollars, and the organs I have found still sound quite good (compared to the St. Annes Mosley which I would have been using). I have found a somewhat inexpensive interface for my computer that outputs two stereo RCA signals plus a headphone signal, so I'll be able to practice with headphones and also have more control over the output

    The stuff should arrive Friday, so I'll get to work then

  3. #13
    ppp Pianississmo NatePul's Avatar
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    Jan 2018

    Unfortunately, I just found out today that I had shipped the 475 ohm resistors to the wrong address, so I won't have them till Monday. The rest of the stuff arrived, and I got a start with soldering in the 20k resistors. Monday will be a day off for me, so I'll have time with which to get everything assembled completely

  4. #14
    ppp Pianississmo NatePul's Avatar
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    Jan 2018

    1 members found this post helpful.
    So, I have gotten the resistors in the mail, and I soldered the summing cables together (4 of them, total).

    Today I went to install them in the organ. After a bit of experimenting, I found that the cables that fed the mixer panel (numbers 1 to 6) were as follows:
    1: Half of the Great/Pedal stops
    2: Half of the Swell Stops
    3: the other half of the swell stops
    4: the other half of the Great/Pedal stops
    5: Alterable voice 2
    6: Alterable voice 1

    Channels 1 and 4 were controlled by the Great/Pedal pedal and 2, 3, 5, and 6 were controlled by the Swell pedal.

    I was surprised to see that though there were two channels per section, they were just mono connections that split stops equally among each cable.

    Using this knowledge and my summing cables, I connected two outputs from my sound card to channels 1 and 4; the other two outputs went to channels 2 and 3.

    Using the Skrzatusz Sanctuary Organ in GrandOrgue, I created 2 output groups: one labeled Swell, and the other Great/Pedal. I then set the stops to output to their respective output groups.

    Now, I have my laptop sending audio through the organ's amplifier, and I have individual control over dynamics versus a "Master Volume Control" pedal.


    I only have to fix one problem: when I am using an 8' stop in the pedal and press the low A, Bb, or B, there is this vibration from the speaker area that I would consider to be a bad sort of resonance. Everything else sounds fine and is a massive improvement over the organ's original sound (even the notes below A sound fine). Would this be best solved by placing and Equalizer in-line to lower the affected frequencies, or would speaker isolation be the best method (There are two speakers just sitting on a large wooden shelf hidden by a pipe fašade)?

  5. #15
    Moderator jbird604's Avatar
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    Sep 2006
    Arkansas, USA

    1 members found this post helpful.
    Doesn't GO have some kind of built-in equalizer function? If so, just use the controls to slightly reduce the level of the frequency range that causes the vibration.

    If GO doesn't have that kind of function, you might need to get a multi-band equalizer (15 band is good) and route the great/pedal signals through it on the way to the Allen inputs. Then you can locate the frequency band that is causing the undesirable resonance and turn it down a bit.

    Congratulations on getting it set up so neatly. Obviously not every user can do as you have done, since many if not most users will only have the default two channel audio signal from their computer to work with and would not be able to divide the stops by division as you did.
    Church: Allen MDS-45 with Allen MIDI-DIVISION-II expander
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    Shop: Bunch of organs in varying conditions, some good, some not...
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  6. #16
    ppp Pianississmo robhoward's Avatar
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    Nov 2011
    Colorado Springs, CO

    I too have a 2160A at church. It sounds great and a vast improvement over the Nord C2 I was playing. However... I too have wondered about the addition of Hauptwerk. Once you are up and running, and if you are willing, I would love to see some pictures of how you connected everything.

  7. #17
    ppp Pianississmo dr.luke's Avatar
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    Dec 2017
    Columbia, SC

    I have an ADC 2160A. Does your unit have Antiphonal channels? I have considered running a vpo through the antiphonal by disconnecting the native inputs, thus providing open rca jacks for my external source. Of course this means adding a mixer or 4 additional speakers.

    Which "somewhat inexpensive interface" did you find for your laptop?
    Last edited by dr.luke; 01-26-2018 at 11:05 PM.

  8. #18
    pp Pianissimo tbeck's Avatar
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    Sep 2015
    Puerto Rico

    Is that "bad resonance" heard only through you speakers, or through your headphones as well?

    I have many of the Piotr Grabowski GrandOrgue sample sets, and there are some pedal notes that set off sympathetic vibrations somewhere within the church. Piotr claims that he can't completely clean those vibrations without degrading the sound of the pipe. As such, I guess it is a natural artifact of the instrument.

    If that is indeed the problem, you can edit the ODF to "stretch" some of the surrounding samples that don't have that resonance.


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