Figure 14. 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 switches can be used to advantage to enable powers in excess of
the normal power rating to be produced.
Martin Audio – MA2.8 Power Amplifier
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