HDMI receiver vs 4 ohm speakers

Discussion in 'High End Audio' started by tworthen, Jun 7, 2008.

  1. tworthen

    tworthen Guest

    I'm looking for recommendations for a modern HDMI receiver that is
    rated to drive my 4 ohm Magnepan 2 speakers. Thanks in advance.
    tworthen, Jun 7, 2008
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  2. tworthen

    DaveW Guest

    Those Magnepan's require high current output availability due to their 4 ohm
    rating. You are looking at getting a high end, NOT standard consumer brand
    such as Denon or Sony, receiver such as a Lexicon brand or similar. Quite
    DaveW, Jun 10, 2008
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  3. tworthen

    Jdarmo Guest

    I would look at the NAD receivers. The T-755 and T-765 would drive the 'pans
    quite well.
    They are a little pricy, but have the stability that you will need for the 4
    ohm loads. I remember
    years ago, I ran a pair of MG2 with a 40wpc NAD integrated.

    Jdarmo, Jun 10, 2008
  4. tworthen

    Arny Krueger Guest

    ]> I'm looking for recommendations for a modern HDMI
    Receivers that are rated for 4 ohm loads are a bit few and far between.
    However, your speakers are not the kind of speakers that most people use to
    push their receivers to the edge.

    The problem with 4 ohm speakers like yours is that they draw a lot of
    current from the receiver if you push the receiver to its full output.
    However, if you avoid pushing whatever receiver you obtain to its limits for
    extended periods of time, there should be no problem.

    I have a pair of fairly inefficient 4 ohm speakers (KEF Q15s) that I have
    used with a standard non-4-ohm rated receiver for extended periods of time
    without any difficulty.
    Arny Krueger, Jun 11, 2008
  5. tworthen

    JimC Guest

    You might consider getting a modern receiver with the features you want
    plus a decent, high-current amplifier to power your Maggies. Strange,
    but that may be cheaper than getting a preamp-power amp combination with
    the same capabilities, or an upscale receiver with the same features and
    same power capacity.

    JimC, Jun 11, 2008
  6. tworthen

    Sonnova Guest

    I've run many different Maggie models on all kinds of amps from expensive
    tube amps to cheap Japanese receivers. No problems. I wouldn't worry about
    it. As speakers go, Maggies are very easy loads for most amplifiers because
    they are mostly resistive and pretty constant across the audio spectrum.
    Sonnova, Jun 11, 2008
  7. tworthen

    JamesGangNC Guest

    As long as the receiver has analog outputs for the channels you can
    get any number of good, high current, used amps off fleabay for a
    couple hundred bucks. Quality solid state amps have been around for a
    long time now and lots of them work just as well as a new one. Just
    park it on the floor behind your stuff.
    JamesGangNC, Jun 11, 2008
  8. As has been stated, Maggies are an easy load due to their low phase
    angles, so should not stress any decent receiver. I have used Maggies
    previously, and now have Apogee Duetta Signatures, but even those
    notorious amp-busters are actually an easy load (aside from their low
    electro/acoustic efficiency). I do actually use a Krell to drive the
    Apogees, but I've tried several cheap amps and receivers on them
    without audible or thermal problems. Again, this is due to their
    primarily resistive nature, so I wouldn't be overconcerned about the
    ability of any reputable multi-channel receiver to drive your Maggies.
    Impossible to give an actual recommendation since you don't mention
    Angus Stewart Pinkerton, Jun 11, 2008
  9. tworthen

    Arny Krueger Guest

    This sort of thinking, while correct in its way, has some offsets.

    Historically, reactive loads have been problems for SS amplfiiers, but
    modern output devices have addressed that problem well for relatively small
    incremental costs.

    The flat impedance curve of the Maggies does create a different kind of
    challenge, simply because the impedance curve is flat and low.

    Comparing Maggies to the other speaker mentioned in this thread, the KEF
    Q15, both speakers have minimum impedance of about 4 ohms. Furthermore, the
    Q15 is a more difficult load in the sense that it does get signficantly
    reactive over some fairly wide ranges of frequencies.

    Here are impedance magnitude and phase curves for the Q15.



    The phase of the impedance curve reaches an extreme of over 60 degrees at 3
    KHz. However, the impedance is an OK 8 ohms at this point.

    The impedance curve reaches a minimum of 3 ohms at 8.5 kHz, but the phase is
    less than 15 degrees.

    Note that over much of its impedance curve, the Q15's impedance is greater
    than 6 ohms

    Here is impedance magnitude and phase curves for a typical Magnepan speaker:


    Note that the speaker's impedance is less than 6 ohms over most of the
    frequency range. It is uniformly low at low frequencies where much of the
    power in music resides.

    The Maganepan's impedance curve does not have the extreme phase angles we
    see with the Q15.
    The combination of low efficiency, and generally low impedance creates a
    tough load, but in a different sense than a speaker like the Q15 which
    probably has a higher average impedance, but is more extremely reactive at
    some frequencies.
    I sense that extreme operational conditions like home dance parties and
    running the amp into clipping for long periods of time was avoided.
    Arny Krueger, Jun 13, 2008
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