Dynacord DPA 4245, DPA 4260 Power Outputs - Isolated Outputs, Power Outputs - DIRECT OUTPUTS

Power Outputs - Isolated Outputs 25 V

The floating 25 V output is mainly used for driving low impedance loudspeaker systems (4 - 16 ohms). Because of the effect of line attenuation, the distance between power amplifier and loudspeaker systems should not exceed 50 meters. It is further important that the total impedance of the entire loudspeaker network does not decline the nominal load impedance of the 25 V output. For details on the nominal load impedance of the 25 V output, please also refer to the specifications in the appendix.

AUDIO TRANSFORMER OUTPUTS

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

8 8 6 x 8

16 16 12 x 16

figure: example configuration – DPA 4260 with 8 ohms and 16 ohms loudspeaker systems at maximum load

Power Outputs – DIRECT OUTPUTS

In addition to the output transformer equipped outputs and for driving low impedance, high performance loudspeaker systems, the power amplifier’s direct, low impedance outputs are carried out as well, offering a minimal load impedance of 4 ohms. Each power amplifier channel is capable of simultaneously driving loads at the direct output and at the isolated output. But it is of major importance that the overall power consumption of the connected loudspeaker systems or lines does not exceed the output power capacity of the power amplifier.Example: If a loudspeaker system with 8 ohms and a nominal power handling ca- pacity of 300 watts is connected to the DPA 4260 channel A Direct Output, this equals exactly half of the power amplifier’s output power capacity since the minimal load impedance for each channel is 4 ohms. That leaves the possibility to utilizes exactly half of the nominal output power capacity of the channel A 100 V output – which in this example equals 500 watts/2 = 250 watts – to supply a split loudspeaker line. The total impedance of the loudspeaker line has not to decline 20 ohms*2 = 40 ohms.

AUDIO TRANSFORMER OUTPUTS

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

10 x 25W/100V

8 /300W

figure: example configuration – DPA 4260 channel A in mixed mode

22