Lab.gruppen fP 3400 - Manual (Page 10)

MLS TM settings can be different for each channel, and a variety of combinations can be achieved – see
table 2. Table 2 provides the simplest way to find the best MLS TM settings for your application. There is
no risk to damage the amplifier since it is very well protected (even down to 0.3 ohms). The fP 3400
amplifier is a power converter, and by selecting MLS
TM positions you are allocating a portion of the 3400
watts power.
MLS switches on rear panel
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1. Check if the loudspeaker can take the
amp’s maximum output power
(generally, twice the RMS power
handling should be okay).
2. If the loudspeaker can handle the amp’s
maximum output power, leave MLS at
its highest position (0dB).
3. If the loudspeaker is specified at a
lower power handling, reduce the
amp’s output power by changing MLS
to a matching lower value (-2dB, or
-4dB, or -5dB).
4. Try the setup with a musical signal. If
the amp runs into thermal protection, or
into current limiting (audible as
distortion, or as “clicks” from a cone
driver/woofer), reduce the amp’s output
power by changing MLS to a lower
value.
If you reduce the amp’s output power by choosing
lower MLS values, you only reduce the maximum
output voltage. In fact, you will get more current
headroom for low impedance loads. The amp runs
at higher efficiency, and the risk for going into
thermal protection is significantly lower.
Type of mode Power/Impedance
Ch.A
Conventional mode 1100/8 Conventional mode
1500/4
1700/2
High voltage mode 94Vrms High voltage mode
1100/8
520/16
Load matching 1100/8 Load matching
1500/4
700/8
Power sharing 1700/2 Power sharing
1700/2
1700/2
Limited power 1200/2 Limited power
1400/2
750/4
Bi-amp mode 1700/2 Bi-amp mode
1500/4
1100/8
1700/4
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