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  1. #1

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    Default High/Low power amplifier or receiver

    I see many references to low and high power amps....just what criteria determines if an amp is high power...or low for that matter?

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    Like everything else in audio, it's purely subjective...
    HT/2-channel Rig: Sony 50 LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."

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    Quote Originally Posted by muncybob View Post
    I see many references to low and high power amps....just what criteria determines if an amp is high power...or low for that matter?
    Do you mean "high power" or "high current"?

  4. #4

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    my guess is that anything under a 100wpc is low powered... but amp ratings can be very misleading. Most of the companies now rate their equipment with two channels being driven when tested. For example, Sony nominally rates their receivers 100-120wpc with two channels driven. When driving all seven channels, they drop to about 30-45 watss which is a big 6dB loss in volume.

    Conversely, Onkyo rates their top tier receivers at ~120-140wpc with two channels driven. Reviews shows that the receivers can still deliver a considerable 100-120wpc when all channels are driven.

    The difference here is that the Sony does not have a power supply big enough to supply the current required to maintain the power output. The Onkyo OTOH has a large power supply which is quite powerful. It shows up in the weight of the receiver, Sonys weigh in at about 30-40lbs, and the Onkyo weighs about 45-55 lbs. Opening them up reveals the Onkyo has huge power transformers compared to the Sonys.

    So if you are looking for a powerful receiver, do your research and see how the units are reviewed at A/V sites.

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    Quote Originally Posted by Kex View Post
    Do you mean "high power" or "high current"?
    I'm sure that's what he meant to say.....
    Living Room:.................... Zone 2 (Workout Room):
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  6. #6

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    The Pioneer SX-34/SX-34B(aka Allied 333 and Knight 333) 6BM8 push-pull stereo receiver (at about 8 watts continuous per channel) would qualify as low-powered. Not a bad little receiver, though, attractive and relatively inexpensive on the used market.



    The Sansui 221 solid state stereo receiver was also 8 wpc:




    on the other hand...


    A Pioneer SX-1980 solid state receiver would qualify as high-powered at 270 watts continuous per channel into 8 ohms).



    The winner of the 1970s (i.e., FTC-power-spec-era) power wars, though, was the Technics SA-1000 at 330 continuous watts per channel into 8 ohms.



    In between there was ahem the Marantz 2600 at 300 watts per...


    That's pretty much the gamut :-)
    all the best,
    mrh

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    High current is what I meant...sorry!
    Those oldies brought back some memories!

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    mhardy,
    Boy that did bring back some memories.:p I had a Technics SA1010 (early 80's) only 120wpc but it did sound nice and could run MM and MC cartridges on a switchable phono input. Overall build quality wasn't all that great but it was my first real "high end" receiver. That's gone but I still have the speakers I bought to go with it. Genesis Physics 320's they're sitting in a spare room with replacement surrounds waiting for me to get time to replace them.

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    Quote Originally Posted by muncybob View Post
    High current is what I meant...sorry!
    Those oldies brought back some memories!
    oh. nevermind. :-)
    all the best,
    mrh

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    Quote Originally Posted by mhardy6647 View Post

    In between there was ahem the Marantz 2600 at 300 watts per...


    That's pretty much the gamut :-)
    Dear God, that Marantz wrapped with padauk is schweet. Doesn't even look like they oiled it or anything.

  11. #11

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    It's a monstrosity. They're known to have somewhat undersized power transformers, unfortunately.
    all the best,
    mrh

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