Av receiver power compatablity with speakers



I am planning to buy sony sapf55h71 speakers which has 100w power , are they compatible with onkyo receiers which has power output 60 and 90 watts per channel. How do you match speaker power to av receiver power?/


How do you know that which powered av receivers are compatible with speakers, do you match each speaker channer, does Impedence (ohm) of speaker matter?


You need to compare the maximum power input rating of your speakers with the output power from your A/V receiver.

Ideally the maximum output from your A/V receiver should be similar to the maximum input for your speakers which means you know you won’t blow your speakers at high volume.

In reality though providing you don’t have the volume phenomenally high then a slightly higher powered amp can actually be safer as a low powered amp can induce clipping and distortion which can potentially damage the tweeters.

As far as impedence goes you need to match that to your A/V receiver.

Most home theatre speakers have an impedence of 8 ohms and most A/V receivers therefore support this.

Some (mosty higher end) speakers are rated at 4 ohms though and pairing these with say an 8 ohm receiver would place too great a load on it as it’s not designed to support this.

This is because lower impedence draws more current and therefore increases the power demand on the amp.



Speakers do not come with volume buttons. Therefore a single speaker will accept anything you feed it.

However, a multiple speaker set (bass, center, tweeter, etc) will have some sort of electronic schematic called a filter to cancel out all frequencies it was not designed to handle). This can be applied either per speaker (which is the best) or on a single schematic print inside the speaker box (which is the cheapest). There are of course really crappy filters and there are superiour filters. Depends on price and schematic.

What is more important is that the impedance (resistance) as already was mentioned. You need the same impedance at your output as on your input.

There are a lot of professionals and semi-professionals that can give you very good advice on what to connect and what to buy, but perhaps it is more wise to follow a golden rule:

Do you think the sound is good enough for you or not?

If so, do not upgrade your system at all.


I’ve driven over 200 watts of [B]clean[/B] power into speakers rated at 40 watts without issues.

I’ve seen people destroy the voice coils in speakers designed to handle 300 watts with 40 watts.

Rarely does [B]clean[/B] power blow speakers. Power is usually not the enemy. [B]Distortion[/B] is.

When an amplifier starts to clip it generates distortion which will not trip the speaker’s built-in protection (usually fued or reset breaker). It will simply fry the voice coil.

With that said, speakers rated to handle the maximum power of a given amplifier would be fine [B]as long as the amplifier’s output does not exceed it’s rated specification[/B]. Not only for power output but also for THD.

It is all in the operator’s hands.

Distortion generates excessive voltages, which generated heat, which destroys the voice coils.