I bought a used Astron RS-4A 13.8 VDC 4 Amp Power Supply off Ebay for 25.00. Before I did I emailed Toni at Dspeaker to ask about it. His opinion was more power than needed, but perfectly fine to use. A ham radio operator friend of mine said the Astron brand was highly regarded because of it's clean power, and reliability. It was one of the more respected ones he said.
Once I installed the Astron I can honestly say I heard an immediately improvement. Bass had more definition and punch. Midrange had some extra clarity that was noticeable. The unit just came more "alive". I am thinking when I heard this "why in the world would Dspeaker use this cheaper wall wart when using a good linear power supply like this makes the unit sound like it just increased in price!" I listened to the DC with this power supply daily for about 6 weeks before switching back to the "switching" power supply that came with it. The difference in sound to the negative was instant. There was so much of a difference that I emailed Toni at Dspeaker again to suggest that Dspeaker needs to either upgrade the power supply, or raise the price and include an external linear power supply. After all, why hold back on the power supply if it makes the Dspeaker sound that much better?
I have heard of people paying of upwards to 500.00 for a power supply for the DC. IMHO, I am just not sure how much more of a difference it would make, and I am not willing to shell out 500.00 to find out until I read about a side by side comparison. I am thinking that the improvement is such that Astrons are all you need.
