Sorry guys amp that can't keep it's end up at those 1ohms loads, will not have a flat frequency response from 20hz to 20khz no matter what level it's being played at. It becomes a tone control, end of story.
Cheers George
Tube Amp for Martin Logan Speakers
An amp like say a Krell or similar, will remain almost flat in it's response across the frequency spectrum. All you need to do is look at the simulated speaker load graphs of amps at 1/3 power on Stereophile to see what happens to them if they have, high'ish output impedance or can't deliver current, many tube amps exhibit this, and even many Mosfets, they are far from the ideal flat. And the simulated speaker load that Stereophile uses is not as savage as what we're talking about here with the ML's, and things like Wilson Watt/puppy, Alexandria etc. Cheers George |
Here is an Audio Research Reference 150 considered by many to be a tube amp with better drive than most. It's only being asked to drive 2.83v hardly taxing. Look at the black trace in the link, this is Sterophile's simulated (rather easy speaker load), the 150 is having a hard time staying flat.(I can show you an impedance graph of their simulated speaker load, I have it somewhere it's not as nasty as the ML's) Then look what happens to it when it has to drive a straight 2ohm load (green trace) it's really starting to take a dive in the upper mids/highs. What do you think will happen to the highs into a 1ohm capacitive load of the ML's http://www.stereophile.com/content/audio-research-reference-150-power-amplifier-measurements#dgk5iym3Akuwqg5H.97 Cheers George |
Here is a link to those Stereophile simulated speaker loads, as I said hardly as taxing as the ML's loads. http://www.stereophile.com/content/real-life-measurements-page-2#GhGr6lrCxHfPYcsl.97 Cheers George |