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    Turntable low freq. rumble

    Daxhobo, It must firstly be determined whether the problem is hum, loudspeaker feedback or (real) rumble. Both loudspeaker (sub-woofer) and turntable rumble can usually be fixed by an effective hi-pass filter. In fact I consider this an essential feature of good RIAA correction citcuits...
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    Power Output Varying With Ohms

    There is something wrong with such a statement. Assuming that the rail voltage(s) are constant (ideally so), Mr. Ohm says that power equals sq.(voltage) divided by resistance. Thus unless the voltage supply does some funny things, the output can never be independant of the ohm rating of the load...
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    Cap 'break in'

    An EE's reply if you want one: One funny thing: Coupling capacitors are supposed to be important, since they are "in the signal line". Firstly that supposes that electricity only flows 'in a line' instead of back and forth in a 'circle', fully including the earth. Then: Any influence a...
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    Amplifier Power Question

    Regarding class A vs class AB, it needs to be realised that class A is not necessarily better as in having inherently lower distortion - it depends on the design. Hopefully the old problem of possible cross-over distortion with class AB has long since been buried. With correct design there...
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    Amplifier Power Question

    Just a practical point of comparison, if I haven't missed it: It is mostly agreed that while audible, a 3dB difference in output is slight, as in 'not worth writing home about.' 3dB is a factor of two in power. Thus, it is generally not worth vacillating about amplifiers with less than factor...
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    Are there any maintenance needed for a 22 year old Solid-State Power Amplifier and Pre-Amp?

    Also agree - I was going to say, with equipment that new!! As an EE who worked in a research lab, in 1995 components were already quite reliable. But also agree that, depending on your environment, carefully wiping off and blowing out dust will do no harm. And again agreeing, some switches...
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    Option of Tinning Copper Wire or Using Silver Solder

    I worked in a research lab where we tested for creep of solder under pressure under normal conditions. It does take perhaps a week, but solder does creep - enough to cause a loose connection. Regarding the quoted Belden article earlier. Respectfully, I fear the writer is a mite over cautious...
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    Audio Equipment Distortion

    Verdinut, Yes, a figure at say 500 Hz or 1 KHz would be more meaningful, if that is all one is capable of measuring. Distortion measurements are more meaningful if they could also include harmonic components separately instead of the sum of the total, because some products e.g 7th, 9th and...
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    Audioquest HDMI Audio Rigged Demo Exposed and Addressed in Open Letter

    My background is under my name. A previous encounter with AQ was - er - indicative of lack of sound knowledge about cable role in audio (to put it softly). Since then I could find nothing to change that conclusion. Sadly, they are by no means alone in the phenomenon of sales talk drowning out...
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    Art vs Science of Audio Reproduction: Which Team Are You In?

    The title is Art vs. Science of Audio REproduction. I then also presume that some exactitude is part of the theme. Thus, one way of determining this would be to determine whether there is any difference between the input and output of a system. Has anything been added/removed from the original...
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    POWER CABLE

    Well, can only add that I am relieved to feel at home here. Like others I also have the limitation of engineering training. Also like others I am still waiting for any other evidence than anecdotal regarding burn-in, molecules shaking their feathers to look better, miraculous filtering abilities...
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    Why Audio Amplifiers Can Sound Different

    Not much left to say, except perhaps that one is delighted by the sound - er - NO! Let me rather use the term 'sober' - posts all round. Perhaps to condense: It is so sad thet folks do not realise that the only sense available to enjoy music with and thus judge what we desire, is also (like...
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    pre out voltage

    Firstly, to agree that '1V' cannot possibly be just before clipping. I have interpreted a given output as referring to given 'sensitivities' for various input signal values. If involving headroom, that should be specified as such. I must also agree that 'headroom' can lie with the power...
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    Amp ratings

    When a power figure is stated in the same block as the mains voltage, it is mains power rating (required by law in many countries). Mind that in this case it says "Maximum", not zero-signal or stand-by rating.
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    Driver Construction

    Not into driver expertise that much, my intuition tends toward frowning on specialised driver design, as in 'yet another new design'. The immediate picture coming to mind is that with so many makes and types of (good) drivers on the market already, is there really such a void here that the extra...
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    Speakers Warble with Turntable

    Easy test: Place the stylus on a record on the turntable with the turntable stationary. Carefully turn up the volume until acoustic feedback starts, ready to decrease volume so as not to let the feedback get too much. You can do this with various tone control settings (bass; treble should not...
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    Amplifier placement, power cables - truth or myths?

    Just a few extra cents from me: I find that most if not all myths come from intuitive conceptions. "No component is perfect thus all components must degrade the sound", "thicker cables, fewer losses", and the very convinving "it stands to reason, doesn't it!" (difficult to argue with that one)...
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    Dual Subs & Soundstage

    Looking in carefully - but I still miss the point. As was said before: Subs do not image. So respecting all that was said regarding how to connect the subs, equalise the lot, etc. Assuming that the concept of imaging as in 'soundstage' and 'positioning of instruments' is agreed upon, I simply...
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    Simple Tube vs SS in the bass department

    The problem here is that there are so many varieties of tube circuits that is well nigh impossible to give a general reply. Whereas SS amps cannot function without NFB, there are 'schools' who believe in zero NFB (with its control disadvantages), low NFB and normal NFB. Some tube amps have...
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    Concern about too many wires

    Other than neatness and orderliness I see no technical reason to separate leads - then again, should analogue interconnects be long (many meters) and not properly shielding, having a 220V/110V lead running alongside might worry. Listen, and if you cannot hear any adverse effect, no worry.
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