Ahh a good old Family reunion 
Interestingly, the people making (arguably) the current favourite DAC, claim this about SMPS...
Poweramp A2.120 | PHISON AUDIO
"We have choosen a classic linear supply for the power amplifier as we have tested different types of SMPS and every time we end up having worse bass performance from the amplifier even is the SMPS is rated 3 times the power of the linear power supply. It is not something that we need to listen extensively to hear, it is obvious right away for everyone that have heard the difference from SMPS and Linear classic powersupply."
Interestingly, the people making (arguably) the current favourite DAC, claim this about SMPS...
Poweramp A2.120 | PHISON AUDIO
"We have choosen a classic linear supply for the power amplifier as we have tested different types of SMPS and every time we end up having worse bass performance from the amplifier even is the SMPS is rated 3 times the power of the linear power supply. It is not something that we need to listen extensively to hear, it is obvious right away for everyone that have heard the difference from SMPS and Linear classic powersupply."
Anyone can make claims
I assume that is in the context of linear (class A/B) amplifiers?
Anyone can make claims
I assume that is in the context of linear (class A/B) amplifiers?
What difference would it make?
Class D amps are less sensitive to power supply issues (especially HF noise) - even more so with SMPSs designed to drive class D amps.
Especially HF noise; so maybe more issues?
Class D and class A/B amps both draw power supply current with signal, so I don't see much difference there.
Both would be sensitive to power supply sag because of current peaks combined with not so low impedance power supply.
Class D might be less sensitive to HF noise because of its limited HF bandwidth but I doubt if that is an advantage.
In what respect differ SMPS's designed to drive class D amps from common SMPS's?
Class D and class A/B amps both draw power supply current with signal, so I don't see much difference there.
Both would be sensitive to power supply sag because of current peaks combined with not so low impedance power supply.
Class D might be less sensitive to HF noise because of its limited HF bandwidth but I doubt if that is an advantage.
In what respect differ SMPS's designed to drive class D amps from common SMPS's?
One significant difference between SMPS's is whether they are synchronized or not.
Class D amps, by design, have a low pass filter / choke on the output. Yes, it is an advantage, unless you are using your amp as mosquito repellent or are trying to communicate with bats.
Mains frequency.
They do, at moderate frequencies. They are remarkably bad at high frequencies due to the inductance of larger electrolyte caps.
Synchronized with mains frequency?
That's new for me. Interesting. Any link available to dive into that subject?
Instead of a couple of large electrolytic caps, preferably assemble a bank of small caps with for example Panasonic FC's, and no problems with the inductance. It's not a linear supply related issue.
That's new for me. Interesting. Any link available to dive into that subject?
Instead of a couple of large electrolytic caps, preferably assemble a bank of small caps with for example Panasonic FC's, and no problems with the inductance. It's not a linear supply related issue.
I'm not on either side but the diagram in the link shows diodes replaced with switches. If those switches aren't timed correctly with the mains frequency I would expect magic smoke. Well actually a light show and loud poof!
Sent from my iPad using Tapatalk so there will be spelling mistakes...
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