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Audio Impedence Matching Circuit

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Suraj143

Active Member
I have a PA amplifier. Its output power is 70W, 100V, 4-16Ohms.

What I want is a small circuit to give inputs from the above amplifier (output) to another amplifier (input) rated 470mV/10Kohms specifications

Thanks
 

Suraj143

Active Member
Hi Nigel I don't know what is an attenuator !

The speaker is in very far.So I need to take the signal from the speaker to the input of the 2nd amplifier (470mV/10Kohms).

What should I make?
 

Suraj143

Active Member
Ok thanks but PA speaker systems have another transformer inside the speaker.

Do you telling to use a voltage divider input of the transformer (same amplifier output) or output of the transformer (final speaker lines).
 

Suraj143

Active Member
I just calculated divider resister values.Top resister should have 2.2Mohms & the bottom resistor must have 10K.

Is my values ok?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
I just calculated divider resister values.Top resister should have 2.2Mohms & the bottom resistor must have 10K.

Is my values ok?

Try it and see - however, you're better off tapping from the 4-16 ohm ouput, as the 100V transformer output 'may' be isolated - if not, then it's fine to use the 100V. I would suggest an initial 100/1 ratio if you're tapping off the 100V line, bringing it down to about 1V
 

audioguru

Well-Known Member
Most Helpful Member
If you use very high value resistors like 2.2M feeding 10k then you will lose high audio frequencies and will not have enough output level.
Use 22k ohms /0.5W feeding 470 ohms /0.25W ohms then turn down the volume control on the second amplifier to the volume you want.
 
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