Audio Transformer Outputs, Bridged Mode

Bridged Mode

Doubling the power amplifier’s output power is accomplished by engaging bridged mode operation, whe- re the two power amplifier output stages are linked for push-pull operation. In other words, a monaural power amplifier is “created” offering double the output voltage and double the output power capacity of a single channel. As a result you are provided with floating 50 V, 140 V, and 200 V as well as with a direct output with doubled nominal output voltage.

If the BRIDGED-MODE switch is engaged, the audio input signal has to be fed via the CHANNEL A input while the CHANNEL B input is without function. The signal is internally inverted and the power amplifier stage B is driven by that inverted signal. The power amplifier stage A is still driven by the unaltered inco- ming audio signal. Bridged mode operation is possible with using the isolated and/or the direct outputs. When using the isolated outputs, bridging the (–) binding posts of channels A and B is mandatory, using short cables with suitable diameter (1.5 mm2 ... 2.5 mm2)!

Careful consideration of the loudspeaker systems’ correct connection is important in preventing phase correlation problems. Channel A carries the signal “in phase” and therefore has to be connected to the

(+)-pole of the correspondent loudspeaker system while the loudspeakers (–)-pole has to be connected to the (+)-output connector of channel B. The output voltage of each power amplifier stage A&B is pre- sent at the binding post strip, but utilization is not recommended because of the negative correlation.

AUDIO TRANSFORMER OUTPUTS

B	LOW IMPEDANCE			A
+ 100V		BRIDGED+		100V +
+ 25V +70V		1200W/8		70V+ 25V+
+ 25V +70V	B	DUAL	A	70V+ 25V+
	B	DUAL	A
	+	600W	+
		4
100 70	0 DIRECT OUTPUTS 0			70 100
	ISOLATED OUTPUTS

∗

50V

BRIDGED 50V

.....1000W

figure: output connection in 50 V bridged mode operation

*Caution! The bridging cable has to be at least 1.5 mm2 in diameter.

Driving 4 ohms loads at the direct output is not admissible in bridged mode operation. For details on nominal load impedance and nominal loads of the individual outputs in bridged mode operation, please refer to the specifications in the appendix. Also in bridged mode, the nominal load impedance is not to be declined.

DPA 4260, DPA 4245 specifications

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