The
Theory of Operation
BTL mode (also called 'bridged' mode) uses both channels of the
When the MODE switch is in the 'BTL (MONO)' position, only the Channel A input is active; the Channel B input is disabled, and signals present at either of the Channel B input connectors are ignored by the amplifier. The signal at the Channel A input is amplified and sent to both outputs of the
polarly of Channel B is reversed with respect to
Channel A. In other words, the two channels are intentionally out of phase.
The single load (remember, BTL is a monophonic, or
BTL mode is electrically identical to
BTL operation
The voltage across the load is thus effectively doubled
– which doubles the power.
Notice there is a crucial difference between BTL mode and what is normally termed 'mono' in the HiFi world. When we select 'mono' on a HiFi preamp or integrated amplifier, what we intend - and what we get - is the same signal from both speakers with the same polarity. It is very important to understand the distinction between this and BTL mode, because if two speakers are connected to the
Connections
Before changing the position of the MODE switch or making any input and output connections, turn OFF the
Figure 9 illustrates the connections for BTL mode. The input signal is connected to the Channel A input, using either the
The load is connected across the two output 'hot' (red) terminals, and the black terminals are left unconnected. Be sure to observe correct output polarity: Channel A is positive, and Channel B is negative. Note that the minimum permissible load impedanoe in BTL mode is 8 ohms.
Connecting loads with a lower impedance will result in current limiting, and may trigger the Protection circuits to shut down the amplifier.
120V
NO CONNECTION TO BLACK TERMINALS
Figure 9. BTL Mode Connection
TASCAM