Five 10,000 micro farad capacitors is usually more expensive than one 50,000 micro farad capacitors. Electrolytic capacitor will always delay current delivery to the amplifier. The best electrolytic capacitors are much more expensive than low grade capacitors. Eight of these would work better than four but four of these would work better than eight low grade caps. A power supply that appears to be perfect can modulate when it is connected to an amplifier.
Current response is very sensitive to changes in the supply voltage.
Most transformer manufacturers will protest because the transformer has to be wound extra thick or with double the number or wires. This increases the complexity and costs of manufacturing the transformer. The picture on the left shows the MultiAmps two specially built R-Core transformers. Each has only 1 ohm impeadance and each transformer is powerful enough to drive both channels. The MultiAmp is a dual mono design with no common grounds or cirucits per channel.