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Old 7th February 2003, 12:57 PM   #21
OliverD is offline OliverD  Germany
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When amps are bridged, each amp "sees" half of the speaker impedance at its output. Therefore each amp will deliver its 4 Ohm output power when an 8 Ohm load is connected to the bridge.

If an amp delivers 300W into 4 Ohms, a bridge of two such amps will deliver 600W into 8 Ohms.

When your amplifiers are not rated for 2 Ohm loads (this is the case for both PA-300 and PA-600), you should not connect a 4 Ohm load to a bridged version.

This is of course simplified. Often you will see that the output power of a bridged version is not exactly twice the output power of each channel (at twice the load impedance), because the common power supply for both channels is too weak to supply two channels running at max.
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Old 9th April 2011, 07:44 AM   #22
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Hi.
I have built PA300 and this is a fine amplifire.
but there is problem in my amp and I didn't know how can I do for this situation and I want to help me.
I test it with function generator with 20Hz to 20khz frequency.
But after 5khz(for instance 10khz) and high power the relay is cut off.but in this stage there is not any clipping and the output voltage is still low than 1khz frequency.in this frequency the output voltage is 27V.
but at 1khz and maximum power there is no any problem.so in this stage the output voltage is around 36V and it is more than the 10khz voltage output.
So in other High frequency for instance 20khz the output voltage would reduct to 20V and in this frequency at that voltage relay will cut off.
please help me about it.
thanks.
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