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    I'll bet its fun figuring out those values for...

    I'll bet its fun figuring out those values for real world caps from the typical vendor spec sheet... or do you measure them on the bench?
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    they are a 2-way speaker with a 3" cone tweeter...

    they are a 2-way speaker with a 3" cone tweeter mounted on a bridge over the 8" shallow woofer.

    and, no, as-is, they don't work. they are at best parts for a rebuild project, and I honestly...
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    trashed pair of altec 409-8c

    i stumbled upon a old pair of altec 409-8c, sadly, abused as car speakers for a long long time, and then somewhat trashed. i suppose these are probably totally worthless and should just be tossed ?...
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    I'm inclined to suspect that another reason why...

    I'm inclined to suspect that another reason why 9V is enough regardless of the signal negative peak voltage is that a few millivolts of glitch on a large signal is insignificant, while that same few...
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    http://www.mouser.com/Images/mouser-reg-logo.gif...

    http://www.mouser.com/Images/mouser-reg-logo.gif http://dkc3.digikey.com/hp/en/ts_dklogo.jpg

    (eg, you buy the parts, you build your own)
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    while I think 4313b may have nailed the ghist of...

    while I think 4313b may have nailed the ghist of it, I'll try to answer literally in the most non technical terms I can come up....


    Capacitors are a key component used in crossover networks to...
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    indeed. and the other link... ...

    indeed. and the other link...

    http://www.linearx.com/cgi-bin/filebot.pl?/pdf/XvrShop_Brochure.pdf
    [the crossover shop brochure...]


    I'm impressed. I'd seen various LEAP graphs here, but...
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    of course, LEAP probably models a theoretical...

    of course, LEAP probably models a theoretical perfect capacitor and doesn't cope with things like dielectric absorption, internal resistive leakage, parasitic inductance, or any of the rest of the...
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    the phase shift as measured in degrees depends on...

    the phase shift as measured in degrees depends on the frequency, capacitance, and impedance of the circuit. a circuit that causes a 90 degree phase shift in a 8khz signal will only shift a 60 hz...
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    ah, yes, Bob Pease. that man is a genius. I miss...

    ah, yes, Bob Pease. that man is a genius. I miss reading his regular columns in Electronics Design.
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    indeed, many people believe in Magic, as defined...

    indeed, many people believe in Magic, as defined by Arthur C Clarke: Any sufficiently evolved technology, meaning, something beyond the understanding of the observer. :deal:

    Magicians perform...
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    RMS is normally used on AC voltages, it stands...

    RMS is normally used on AC voltages, it stands for Root Mean Square. for a DC, or unchanging constant voltage, RMS would be somewhat meaningless, and in fact, any DC offset (bias) is usually removed...
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    +9VDC and a +/-9V AC signal (aka 18V P-P aka 6.4V...

    +9VDC and a +/-9V AC signal (aka 18V P-P aka 6.4V RMS) would equal a 0-18V signal. you can call that what you want, AC and DC are just names and abstractions.

    its all volts, its just that some...
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    AC is volts changing over time, while DC is...

    AC is volts changing over time, while DC is constant volts. volts is volts.

    Electronics engineers tend to prefer to simplify things and treat DC and AC as distinctly different things, it...
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    you cut off the interesting part... its just...

    you cut off the interesting part...


    its just that AC is changing in time while DC isn't, so this complicates the circuit analysis, and takes it from simple arithmetic into the realm of calculus...
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    actually, AC and DC follow exactly the same set...

    actually, AC and DC follow exactly the same set of rules, its just that AC is changing in time while DC isn't, so this complicates the circuit analysis, and takes it from simple arithmetic into the...
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    my comment about Magic was in reference...

    my comment about Magic was in reference specifically to Hoerniger's statement ...



    odd how a foil which can change polarity at megahertz speeds would have a memory for a dc charge that required...
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    I do not believe in Magic.

    I do not believe in Magic.
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    a capacitor is charged to 63% after R*C seconds,...

    a capacitor is charged to 63% after R*C seconds, so 2.2 megohms into a 20uF capacitor (typical for what I've seen) would be 63% charged in 44 seconds. another 44 seconds would charge 63% of the...
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    the obvious answer is, when they aren't...

    the obvious answer is, when they aren't outputting 9V anymore. I'd bet they are good for 3-4 years assuming the series resistor is on the order of several megohms as I've seen in most of the...
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    so how come the biased cap designs I've seen...

    so how come the biased cap designs I've seen haven't also had bypass caps?

    [/me ducks and runs laughing maniacally..... is it Friday yet? :p]
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    I had one piece of 1970s stereo gear go postal on...

    I had one piece of 1970s stereo gear go postal on me and deliver 70 volt square waves at 200khz regardless of the input signal. I couldn't HEAR it (maybe my dog could?), but smoke came out of the...
  23. Thread: wtf big horns

    by pierce
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    ok, turns out it WAS a Community horn, but not a...

    ok, turns out it WAS a Community horn, but not a Leviathan, it was a unamed one-of from the 80s, a bass horn with JBL D130 as the driver (!) and a nested mid horn with a 2" throat and a JBL driver (I...
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    grills off at the moment, and worse, they are...

    grills off at the moment, and worse, they are crowded against the wall, half buried in stuff, and I'm sitting like 2 feet from one. this all conspires against these speakers, I know.

    I *need* to...
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    Just to achive some closure here, today, I got my...

    Just to achive some closure here, today, I got my speakers back from the local sound shop that re-foamed them, and reinstalled them in my L100T's.

    they did a decent job, although it does look like...
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