There is only one power conditioner that can really deliver, that won't limit a large power amplifier. It was made by Elgar and was for industrial/commercial purposes, so you have to find one used on ebay, and may have to get it refurbished.
It is mechanically noisy, so you have to place it near the breaker box in your house, and run the wiring from it to your audio room. You might have to have an electrician do the work.
However. It is easily the best made, and the 3006 can deliver a perfect sine wave at full load of 28Amps at 117Volts. Seems to me there is a 1KVa version as well. No noise, no distortion, no spikes. The principle of operation is sophisticated- well beyond what typically passes for 'high end'. It uses an isolation transformer, a precision 60Hz oscillator that is synchronous with the AC line, a power amplifier and a comparator circuit. If the output deviates from the reference oscillator, a feedback signal is created and applied to the feedback winding on the transformer- the result: a low distortion sine wave free of noise.
This is the only conditioner I know of that can handle a set of our MA-2s or MA-3s. Most conditioners I have heard mess things up even when presented with our M-60s as a load, so usually I recommend plugging straight into the wall unless you have an Elgar.
