Lab.gruppen fP 3400 - Manual (Page 9)

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The Bridge mono mode is used to deliver both channels' power to a single load. The nominal impedance
of the load must be more than 3 ohms. Set the Link switches to the “On” position and use one of the
input connectors. You may use the remaining input connectors to carry the signal to other amps. Both
level attenuators must be at the same position. We recommend that you set them to the 0dB (full)
position.
Connect the speaker as shown. Always use Channel A’s output connector.
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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 o
4 ohms part of the load, and the other
channel shares the other 4 ohms part. The power into 4 ohms from an fP 3400 (MLS at 0dB) is 1500W
So, the total bridged power into the 8 ohms load will be 2 x 1500 = 3000W
ne
.
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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 3400 into 2 ohms without increased heat loss.
As stated earlier, the fP 3400 can produce 1500 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 3400 can produce output power in excess of 1500 watts.
fP 3400
MLS SWITCH SETTING
LOAD CONFIGURATION -5 dB -4 dB -2 dB 0 dB
16 ohms Stereo (2 channel) 160 W 200 W 340 W 520 W
8 ohms Stereo (2 channel) 300 W 400 W 700 W 1100 W
4 ohms Stereo (2 channel) 600 W 750 W 1300 W 1500 W
1900 W [2]
2 ohms Stereo (2 channel) 1200 W 1400 W 1550 W 1700 W [1]
1900 W [2] 3000 W [2]
16 ohms Bridged mono 600 W 800 W 1400 W 2200 W
8 ohms Bridged mono 1200 W 1500 W 2600 W 3000 W
4 ohms Bridged mono 2400 W 2800 W 3100 W 3100 W 1
[1] Component tolerance dependent
[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.
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