Output filter Caps

Yes and no. Yes the "rewards" are a higher reserve peak current that gives better low frequency extension and control, frequency dynamic range etc as stated by Sean above. But...

By increasing the supply capacitance, you are forcing the transformer to push out more current through its secondary windings. The xfmr VA rating is determined by the DC power on the load side, temperature rise of the secondary, and the secondary voltage. By doubling the filter caps you are increasing the xfmr secondary current draw (what goes out of a cap must come in). Since the xfmr VA is fixed and the filter caps provide a pure capacitance load, the xfmr does not produce more power with the increased current flow. Instead, it is dissipated as heat. Heat which can damage the xfmr and the circuitry nearby (diodes, regulators, etc). The xfmr is now producing more reactive power and less "working" power. The xfmr is an integral part of the PS and, as far as I know, cannot remain a constant with respect to filter cap sizes.

And, for God's sake, be careful about monkeying around with filter caps. They have enough energy stored to kill you if you short them with yourselfdom - even months after the power is switched off.

Lincoln: In response to your email about replacing the stock 22,000MF caps with 27,000MF caps...

From what I remember, the DH500 is rated at 250wpc/8ohms. Which means that it is probably a stable voltage source down to 2 ohms (250wpc/8ohms 500wpc/4 ohms 1000wpc/2ohms). Therefore a 1000 VA transformer is MOST LIKELY it's xfmr size, assuming it is sized for a minimum impedance of 2 ohms. The current output at 1000 wpc is 32 amps and the peak to peak voltaqe would be 63V. The RMS current is calculated at 22 amps and the peak current @ 1000 watt is 1.4 RMS or 31 amps. Assuming 1,000MF for each amp RMS, that's where the 22,000MF is derived for you amp (which is what you stated in your thread).

You can use a pair of up to 31,000MF (up to the peak current) caps without taxing the xfmr. If you really want to go all out, I would use two 15,000MF caps is parallel. Reduces the output impedance by one half and makes for better performance.

Sean: no disrespect taken whatsoever...my mistake - I did not make it clear that my off-the-back-of-the-matchbook calcs were for EACH channel; not the total. Again, I make no claim that I can "re-design" the power supply better than the designers, just trying qualify what MIGHT happen should filter caps be added to a PS with regard to the xfmr.