distortion at 4 ohms vs. 8 ohms?

I got a hi-fi amplifier (Harman Kardon AVR45) off Craigslist (what a
deal), and am running it on four 4-ohm speakers within the house.
(Two 10" subs, rated at 200+ W continous; two 6-1/2" speakers rated at
300W continuous). The manual specs say the following:

Five-Channel Surround Mode
Power Per Individual Channel

Front L&R channels:
55 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Center channel:
55 Watts, @ < 0.07% THD, 20Hz–20kHz into 8 ohms

Surround channels:
55 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms


It sounds great on 4 ohm speakers.

I was wondering, what kind of increased distortion numbers am I
looking at, running at 4 ohms?

I know not to overdrive it too much, since it will get hot. Most of
the time I listen to George Winston piano solos, but during the
occasional party, ... well, it still works...

Thanks,

Michael
.

Relevant Pages

  • Re: Single ended triode amplifiers
    ... If the most efficient speakers are used, ... This is 25 watts per channel. ... So let me see, if my speakers have an efficiency of 96dB SPL/1W/1M, then ...
    (rec.audio.tubes)
  • Re: ? for Will Brink about Dorian
    ... but the channel is still there. ... Paradigm makes packages with speakers well matched. ... You have a top of the line SUB... ... and good quality front speakers are better to reproduce the lower ...
    (misc.fitness.weights)
  • Re: No stereo sound First set of answers
    ... No music comes through the left channel from any source: CD, DVD, wave file, the speaker test program, nothing. ... I think this is not relevant because after noticing the problem, I plugged in two different sets of headphones with the same result: no sound from the left channel. ... only Creative can answer why they wired their speakers to work that way. ...
    (microsoft.public.windowsxp.hardware)
  • Re: Speakers and amp power
    ... It is doubtful that you will deliver 100 watts to ... the speakers on an average continual basis. ... RMS rarely do they tell you how they arrived at this spec. ... receivers that claim to put out 100 watts per channel for 5 channels. ...
    (rec.audio.car)
  • Re: ? for Will Brink about Dorian
    ... since the quality of right and left is better then the centre, ... but the channel is still there. ... Paradigm makes packages with speakers well matched. ... You have a top of the line SUB... ...
    (misc.fitness.weights)