I was reading through this thread http://www.psaudio.com/ps/forum/viewthread/2100/P0/ and read Paul's comments:
What we have determined over all these years of building regenerated power devices is that the three most important issues of power to be dealt with are:
1. Low output impedance. Lower than the wall.
2. Dynamically regulated voltage. This is where the voltage never waivers under dynamic (musical demands) conditions.
3. Perfect shape sine wave. This is where we add missing energy back to correct the sine wave shape. We measure the results as distortion.
Unfortunately, only a regenerator like the Power Plant can address all three of these major issues. Isolation transformer, balanced transformers and passive filters all make every single one of the above desired results WORSE not better.
He goes onto to say:
Yes, a Power Plant produces well over 100 times LESS output impedance than what comes out of the wall - so instead of raising it like everything else on the market does, it lowers it - and dramatically so.
What are your thoughts on this? Does the Buss lower output impedance?
The short answer is: yes, of course.
Any power supply needs to be low noise, low impedance to be effective and applicable to quality audio reproduction.
The wall output impedance is generally given to be ~ 1 ohm. The PFC network in an UberBUSS is about .001 ohm, but it is in parallel with the wall impedance and the load will vary upon the the PFC. Under normal operating conditions, the output impedance is less than .1 ohm.
I agree with what Paul has to say
in theory, but application sometimes proves to be different. Also, the target use has to be considered. For noise reduction, balanced transformers measure superior at my home. Dynamically regulated voltage is less important the dynamic current capability. The PP are limited here.
As a past owner of Power Plants, they worked well as long as the use did not exceed the headroom capabilities of the PP. Dynamis headrrom on them appeared to be < 3dB which is not suitable for large power amps. The PPs are essentially class AB stereopower amplifiers putting out 60V RMS to the outputs with one inverted to give AC. Even my 20W Cary Class A amps would run a P600 out of current with the resultant dynamic compression of the music. They did sound very good on froint ends, especially when driven with an UberBUSS
The PowerPlants would be ideal for the new generation of digital amps, methinks.
The new BatteryBUSS has an output impedance of < .01 ohm, FYI.
Dave
