MIT impedance settings

heiney9
heiney9 Posts: 25,165
edited June 2010 in 2 Channel Audio
I have a pair of std RCA MIT Shotgun S2 interconnects I plan on running between my amp and pre-amp. These have a 3 position impedance switch how do I determine where to set the switch

The Aleph 30 has an input impedance of 47 Kohms

The Adcom 750 has an output impedance of 600 ohms

Any help or explanation would be great.

H9
"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • madmax
    madmax Posts: 12,434
    edited June 2010
    Where they sound the best.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    madmax wrote: »
    Where they sound the best.
    madmax

    Not the answer I was looking for. Trying to understand the mechanics of why they need impedance matching. :)
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • Face
    Face Posts: 14,340
    edited June 2010
    Rtfm. ;)
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    Face wrote: »
    Rtfm. ;)

    It doesn't really explain it, unless I missed something :)
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • Face
    Face Posts: 14,340
    edited June 2010
    I was under the impression it did, but it's been a long time since I read it(or any manual).

    EDIT: Are you using the 750 in passive mode at all times? Does it have an input buffer?
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • thsmith
    thsmith Posts: 6,082
    edited June 2010
    H9, Doubt I am answering your question but the impedance setting on the MITs should be set to what is a close match to the Preamps input impedence.

    I have S3s. I forget what setting I used on my 750.
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs
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  • BlueFox
    BlueFox Posts: 15,251
    edited June 2010
    I just recevied the Shotgun S1.3 ICs last week, and the instructons say to set the impedence to the input impedence of the cable destination. The output impedence is not used for the cables. Mine were XLR so they could only be installed in one direction, but I believe RCAs are directional.

    The confusion issue for me is the upper low end range on the settings extends into the low end of the mid range setting. Anyway, mine are set at the low end, and they sound great. Maybe I might try the mid setting at some point in the future once I am 'used' to the new sound of these cables.
    Lumin X1 file player, Westminster Labs interconnect cable
    Sony XA-5400ES SACD; Pass XP-22 pre; X600.5 amps
    Magico S5 MKII Mcast Rose speakers; SPOD spikes

    Shunyata Triton v3/Typhon QR on source, Denali 2000 (2) on amps
    Shunyata Sigma XLR analog ICs, Sigma speaker cables
    Shunyata Sigma HC (2), Sigma Analog, Sigma Digital, Z Anaconda (3) power cables

    Mapleshade Samson V.3 four shelf solid maple rack, Micropoint brass footers
    Three 20 amp circuits.
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    Face wrote: »
    I was under the impression it did, but it's been a long time since I read it(or any manual).

    EDIT: Are you using the 750 in passive mode at all times? Does it have an input buffer?

    Ha, no mostly active and some passive, but here's the kicker. Most of the time I run the Dared tube pre-amp through the HT bypass on the 750, especially for serious listening sessions. I wouldn't think that would change the impedance.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited June 2010
    use the input impedance of the component receiving the signal but r u wanking this or what
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    reeltrouble1 wrote: »
    but r u wanking this or what

    If you are referring to the tube pre running through the HT bypass, no it does exactly what it's supposed to do, pass the signal straight through. I do this because sometimes I don;t have time to listen to tubes so this way I can turn on the Adcom 750 and listen to music without having to worry about warming up the tubes or short on/off cycles of the tube gear. It's especially nice when I want to watch a movie I can just run the SS gear saving tube life.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited June 2010
    r u trying to match my dribble.......................good luck, U dont know where to set the switch.........waaaaaaaaaa, must be a slow day, sure is for me, feels good. Anyway, when I had the Dodd Tom now has I did that with its by-pass, had some nice Tele smooth plates in it, but alas, in the end the two-channel was missing that last 3.83%% or so on the Rabbit Hole scale of Ear Candy Magic so I built the HT room and 2-ch Room, oh yea, I bought a few components, hi-fi stuff as they say. So U have been getting your hi-fi on for a bit, no doubt, good luck though with the switch thingy.

    RT1
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    reeltrouble1 wrote: »
    use the input impedance of the component receiving the signal but r u wanking this or what

    So if the input impedance of the amp is 47 Kohms, then set accordingly? Yep, slow day here, beautiful day as well.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • dorokusai
    dorokusai Posts: 25,577
    edited June 2010
    Face wrote: »
    Rtfm. ;)

    Why did you buy something you don't know how to use?
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • heiney9
    heiney9 Posts: 25,165
    edited June 2010
    dorokusai wrote: »
    Why did you buy something you don't know how to use?

    I do that all the time :D.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited June 2010
    its what I would do.

    so you see Tubes add Soul
    and Tubes add Warmth
    and Tubes do it with a Matched Mate
    the correlation to the essence of life is evident

    Tubes Rule.

    MIT Rocks.

    RT1
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  • dorokusai
    dorokusai Posts: 25,577
    edited June 2010
    heiney9 wrote: »
    I do that all the time :D.

    LOL....you're not alone Heiney. I usually keep mine in the middle for all gear since I've found it's the most common set of values.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • F1nut
    F1nut Posts: 50,566
    edited June 2010
    So if the input impedance of the amp is 47 Kohms, then set accordingly?

    You got it. :)
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • hearingimpared
    hearingimpared Posts: 21,137
    edited June 2010
    Brock if the input impedance of the target component falls between two different settings on the box, I've found that the higher switch selection sounds best. I asked Joe Abrams about this when I was wiring up all my components and this is what he recommended . . . to my ears, he was right.
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  • madmax
    madmax Posts: 12,434
    edited June 2010
    heiney9 wrote: »
    Not the answer I was looking for. Trying to understand the mechanics of why they need impedance matching. :)

    OK, I guess you could set them to where they sound the worst. :D

    Impedance matching allows maximum power transfer and probably some slight change in the frequency curve. If it were RF it would deal with reflection but at audio frequencies I don't think this is relevant. In actual use of these little switches I notice a wider more open soundstage at one extreme or more detail and cohesivness at the other extreme. No matter the case its still a tradeoff and what matters is what sounds best to you given your system characteristics.
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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