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babadono

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Posts posted by babadono

  1. Youthman,

    From the look of your equipment list I suspect you have had to track down problems like this before. If not you are blessed. Please do yourself a favor and go to the Jensen Tranformer website and search their app. notes and white papers. They explain how to systematically go through your system and determine the cause of the problem. Of course they want to sell things also but the amount and quality of the knowledge they dispense for free is awesome. Usually with unbalanced gear it is bad cables and dirty connections or somehow unbeknownst to you a ground loop has been introduced in your system.

    Happy troubleshooting

    no affliation with Jensen Transformer

    babadono

  2. As I have stated in other threads there is excellent info on tracking down these types of issues on the Jensen Transformer website. How to make shorting plugs/cables for unbalanced or balanced gear and how to use them to track down problems etc... etc...

    One of the best suggestions..write down what you do/try or else you will repeat your attempts.

    No Affliiation yada,yada ,yada

    babadono

  3. Tasdom,

    Hopefully you will get this... I know your posts are a little old. But I have a question. Is your TV base sitting directly on top of your RC64? I was wondering if this would be OK to do. I am thinking to get a wall mount for my TV instead and set the RC64 on top of my cabinet. BTW who made or where did you get your cabinet?

    babadono

  4. Everytime the the power is increase 10x, the SPL will increase by 10 db:


    1
    watt = 90dB



    10
    watts = 100dB



    100watts
    = 110dB


    This reminds me of how quick you can run out of amplifier power. I agree with some of the other post on increased dynamic as a goal and not volume. Most Klipsch speaker can get really loud but the detailed sound is what's best.

    And remember every 10dB increase in SPL is preceived by us humans as a doubling of volume. So in the example from 90 to 110db it got 4 times louder but the amplifier power went up 100 times!

  5. Beechnut,

    Did you even consider in ceiling speakers? I really want to hide as many wires as possible and I know in my realatively new house the electrician put some wires up in the ceiling someplace. He said "Oh you're gonna need these, trust me". In my situation it is one side that is open to the kitchen not the rear.

    babadono

  6. Hello,

    I am a long time Klipsch heritage speaker owner in my 2 channel set up but trying to get my first HT set up in my familyroom. I am thinking of going with RF-7ii and RC-64ii across the front but because of the room and WAF I think I'll have to go with in ceiling speakers for surrounds and/or rear. Is this going to work? Any help is much appreciated.

    babadono

  7. DrWHo/djk,

    Please do not take offense by my questions and comments. I am not in any way trying to be obtuse only trying to understand this. It looks like by your graphs DrWho that in the audible band the 2.2k resistor doesn't make as PWK used to say a "dimes worth of difference". Especially with the 100 ohm output impedance. Am I interpreting the graph correctly?

    babadono

  8. DrWho,

    In both graphs there are two sets of curves, excuse my ignorance but one is amplitude and one is phase? Ok that's cool. But 1 Mhz, even the dogs in my neighborhood can't hear up there and I'll be lucky if I can hear 15 kilohertz. But thanks very much for anaysis. I still don't understand the original claim by djk that loading down the input of an amplifier magically cancels the effect of cable capacitance. I do understand of course that measuring or listening to an amp that has its input unterminated is noisier than an amp whose input is shorted to ground through 2.2k.

    babadono

  9. Some of us just design our output stages to drive the capacitive load...lowering the input impedance is just lowering the impedance seen at all frequencies in the same way that the capacitor is reducing the impedance at high frequencies - not at all an elegant solution if you ask me, and one with quickly diminishing returns.

    Dr Who?/djk

    I'm getting confused. The lower input resistance is still getting even lower at higher frequencies because of the capacitve reactance (of the cable) isn't it? Maybe that is what you mean by a non elegant solution. This sounds like hocus pocus to me. What's the difference if the 2.2 k is at the output of the driving circuit or the input of the receiving circuit? It still attenuates the signal because of the non zero output impedance of the driving circuit.

  10. Terminate the amplifier input with a low value resistor and any roll-off from capacitance will become moot.

    I use 2.2K, most preamps can drive that with ease.

    This will also reduce 1/F noise on long cable runs, as much as 10dB.

    djk,

    When you say terminate what do you mean? 2.2K right across the input signal to ground? Or in series with the signal?

    babadono

  11. Coytee,

    Only 2 feet! Just about any wire configuration should work. It sounds like you have confirmed that you are talking about unbalanced equipment (I own a 3BX also, I know it is unbalanced). The chassis of the 2 pieces of equipment must be tied togrther some how. Otherwise there is no circuit. But at a length of 2 feet it is not going to matter if is the shield or the white conductors or both that are connecting the chassis together. BTW if your 3BX is as old as mine, which it probably is since they only made them for a few years long ago, make sure you give those RCA jacks a good cleaning.[;)]

    babadono

  12. Coytee,

    What are you wiring? Unbalanced equipment? If so you should always use the shield for the ground connection, otherwise why call it a shield? Whether you also use the white conductors is a try it both ways and see. Adding the white conductors will lower the resistance of the ground connection (good) but also increase the capacitance the signal on the blue conductors see to ground (bad).How long are the wire runs? Remember both resistance and capacitance go up the longer the wire runs.

    babadono

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