Amperes???

AsSiMiLaTeD
AsSiMiLaTeD Posts: 11,728
edited February 2004 in Electronics
I'm gonna get myself kicked out of this forum if I don't quit asking questions...if anyone can refer me to a book to get most of my questions answered, I'm not opposed to reading.

Anyway, what's the deal with amperes? I know that more is better, but that's about it. Why don't all receiver manuals list them? On another thread I posted, someone mentioned that that H/K with 45 amps might drive my 150s, what does this mean, and why is 45 amps better than 30 (my current Oink Tx595 only has 30 (had to contact Onkyo to get that info))?

Thanks again for the info...
Post edited by AsSiMiLaTeD on
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  • VR3
    VR3 Posts: 28,786
    edited February 2004
    Why dont receivers post the ampres? They DONT want you to KNOW how many ampres it has.....

    I could imagine some numbers now........5? is that even possible? lol

    Ampres is like current, the more ampres, the more current is can push *from my understanding*. 15 more ampres is HUGE.......

    Hmm, how many ampres are my Adcoms?

    Again - from my understanding
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • JrVtecAccord
    JrVtecAccord Posts: 64
    edited February 2004
    H/K recievers list thier amps, I believe the H/K AVR 630 has 50amps.
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  • AsSiMiLaTeD
    AsSiMiLaTeD Posts: 11,728
    edited February 2004
    Originally posted by Vr3MxStyler2k3
    Why dont receivers post the ampres? They DONT want you to KNOW how many ampres it has.....

    I could imagine some numbers now........5? is that even possible? lol

    Ampres is like current, the more ampres, the more current is can push *from my understanding*. 15 more ampres is HUGE.......

    Hmm, how many ampres are my Adcoms?

    Again - from my understanding

    So what's considered to be good, in the mid range market, or is there such a standard?
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  • VR3
    VR3 Posts: 28,786
    edited February 2004
    I think....

    35 ampres is the benchmark for high current? Not totally sure..
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • gatemplin
    gatemplin Posts: 1,595
    edited February 2004
    Amps are a unit of current flow. Voltage pushes current through a load (speaker) or E=IR. Current flow creates heat which obviously can melt components. If an amp can dissipate the heat generated from high current operation then it can drive lower impedance speakers without overheating. All HK amps that I know of can drive 4 Ohm speakers. The current drawn is dictated by the Voltage from the amp and the Impedance of the speaker at the frequency of the signal.
    Graham
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited February 2004
    Probably ought to disqualify myself here since I'm the one that said your HK has a chance to drive your 150's, but WTH...

    Amplifiers do have to deliver more current into lower impedance loads to produce the power needed. High Current Capacity (HCC) is a measure of an amp's ability to do so. Two provisos enter here:
    - Speaker impedance ratings are nominal ratings, i.e., a speaker's impedance can dip even lower for certain frequencies and when a speaker is driven hard for periods of time (voice coil heating); and
    - HCC ratings are not for always for continuous output.

    Delivery of 15 amperes is fairly low and typical of amps that struggle with loads less than 8 ohm. Amps with the ability to deliver 45 amperes are getting in the neighborhood of handling 4 ohm loads. Some (Sunfire/ Rotel/ B&K) can deliver 70 or more amperes.

    The higher the HCC the better for lower impedance speakers. How much is enough depend on the speaker and your listening levels.
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
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  • kingkip
    kingkip Posts: 401
    edited February 2004
    can anyone refer me to a book

    amazon.com has lots of books on the subject, type in home theater (or something similar) there are a number out there. Home theater for dummies was pretty good.

    More amps usually is better, but not necessarily. It takes 2X the amps to make the sound 3db louder (the lowest percetible change). Therefore you would ususally want to double the power to get "louder", which remember, isn't always better. As always trust your ears, and not what obsessive/compulsives have to say.
    There are two ways to argue with women. Both of them are wrong.
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  • AsSiMiLaTeD
    AsSiMiLaTeD Posts: 11,728
    edited February 2004
    Originally posted by kingkip
    amazon.com has lots of books on the subject, type in home theater (or something similar) there are a number out there. Home theater for dummies was pretty good.

    More amps usually is better, but not necessarily. It takes 2X the amps to make the sound 3db louder (the lowest percetible change). Therefore you would ususally want to double the power to get "louder", which remember, isn't always better. As always trust your ears, and not what obsessive/compulsives have to say.

    I believe you're speaking of watts here, not amps, am I correct? I've read that bit on the Polk site before.
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  • gatemplin
    gatemplin Posts: 1,595
    edited February 2004
    Yes, current is measured in Amps, power is measured in Watts. It Takes twice the Watts to double output (3dB).
    Graham
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  • Polkfan
    Polkfan Posts: 15
    edited February 2004
    :):):)
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited February 2004
    Originally posted by gatemplin
    Yes, current is measured in Amps, power is measured in Watts. It Takes twice the Watts to double output (3dB).
    ... and four times the current...
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • jdhdiggs
    jdhdiggs Posts: 4,305
    edited February 2004
    Originally posted by Polkfan


    667 watts divided into 7 channels equals a whopping 95 watts /ch which is almost half of the specified power ratings! If we don't consider derating the fuse, than the total power available would be 120V*11A = 1320 watts - 100 watts = 1220 *0.75 = 915 / 7ch = 130 watts / ch which are still below the 170 watt/ch ratings.


    I feel sorry for someone who listens to all seven channels at 95W/channel, that is damn loud....
    There is no genuine justice in any scheme of feeding and coddling the loafer whose only ponderable energies are devoted wholly to reproduction. Nine-tenths of the rights he bellows for are really privileges and he does nothing to deserve them. We not only acquired a vast population of morons, we have inculcated all morons, old or young, with the doctrine that the decent and industrious people of the country are bound to support them for all time.-Menkin
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