Whilst the SMPS may sound complex it is actually very straightforward with
high reliability. The net result is good bass and fast response. Because the
supply is regulated, the power amplifier will produce the same power output
even if the AC line voltage falls by more than 20%!
Figure 13. Current-voltage characteristic of different power supply topologies.
1) Conventional power supply shows voltage drop due to internal resistance.
2) Regulated power supply used by MARTIN AUDIO.
3) Unregulated switch mode power supply with current limiting.
Traditional PSU's can behave erratically at low frequencies, particularly under
clip conditions with the rise in their output impedance producing uncontrollable
speaker cone movement. MARTIN AUDIO SMPS produces its rated power
output at all frequencies regardless of speaker demands and AC line
conditions.
Minimum Load Switch (MLS™)
Thanks to the regulated SMPS, the maximum power available for the output
stages can be adjusted without increased heat dissipation or efficiency loss.
This allows users to match the output power with the loudspeaker impedance.
Because the amount of power delivered into a load is dictated by its
impedance (at 2 ohms you use the least voltage but use the most current),
the MLS switch can be used to advantage to enable powers in excess of the
normal power rating to be produced.
Martin Audio – MA1.6 Power Amplifier
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