Lab.gruppen fP 6400 - Manual (Page 9)

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Bridged mono mode combines the power of both channels into one speaker. This results in twice the
voltage swing, four times the peak power and just less than three times the full power of a single
channel.
One way to understand the load
and power from the amplifier’s
perspective in bridged mode is
that it is zero voltage at the
centre of the voice-coil
winding. This is because the
coil is driven with positive
voltage at one pole and an
equivalent negative voltage at
the other pole. So, if an 8 ohms
load is connected in bridged
mode, one channel shares one 4
ohms part of the load, and the other channel shares the other 4 ohms part. The power into 4 ohms from
an fP 6400 (MLS at 0dB) is 2300 watts. So, the total bridged power into an 8 ohms load will be 2 x
2300 = 4600 watts.
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The MLS TM switches are located on the rear panel. The MLS (Minimum Load Select) switches offer
impedance matching, so you can drive the fP 6400 into 2 ohms without increased heat loss.
As stated earlier, the fP 6400 can produce 2300 watts into both, 2 and 4 ohms. Use lower MLS
TM settings
(e.g. -4 or -5dB) when connecting to lower impedance loads as shown in table 1. As can be seen in table
1, the fP 6400 can produce output power in excess of 2000 watts.
fP 6400 == MLS SWITCH SETTING
LOAD CONFIGURATION -5 dB -4 dB -2 dB 0 dB
16 ohms Stereo (2 channel) 220 w 260 W 410 W 650 W
8 ohms Stereo (2 channel) 430 W 520 W 820 W 1300 W
4 ohms Stereo (2 channel) 830 W 1000 W 1600 W 2300 W
2 ohms Stereo (2 channel) 1660 W 2000 W 2400 W 2900 W [1]
3050 W [2] 3200 W [2]
16 ohms Bridged mono 860 W 1040 W 1640 W 2600 W
8 ohms Bridged mono 1660 W 2000 W 3200 W 4600 W
4 ohms Bridged mono 3320 W 4000 W 4800 W 5800 W [1]
[1] Depending on component tolerances.
[2] Continuous power one channel driven, or peak power both channels driven.
(Thermal protection may occur at high continuous power)
Power in watts (EIA 1 kHz, 1% THD)
Table 1
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 6400 amplifier is a
power converter, and by selecting MLS
TM positions you are allocating a portion of the 6400 watts power.
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