Question about amp power

[dadood 10+ year member]

Someone please help me understand this:

Say you have an amp that is rated at 300W and is a 4 channel amp. Each channel gets 75W. You have a set of 2-way components on channels 1 and 2. Channel 1 outputs to a crossover which feeds a tweet and a mid. If the amp is sending 75W to the crossover, does each speaker receive 75W or is the 75W divided between the 2 speakers?

Say the crossover also has outputs on it to hook up a rear fill driver. Does that driver also receive 75W as well or is the 75W now divided between 3 speakers?

Ya it's a noob question but I just never learned this. Thx.

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[n2audio 5,000+ posts]

regarding the components -- at freq's below the x/o point the woofer will be the load, at freq's above the x/o point the tweeter will be the load -- at or near the x/o point both speakers provide some of the load.

I have no idea how the rear fill would work.

What component set are you dealing with?

 

[dadood 10+ year member]

regarding the components -- at freq's below the x/o point the woofer will be the load, at freq's above the x/o point the tweeter will be the load -- at or near the x/o point both speakers provide some of the load.
I have no idea how the rear fill would work.

What component set are you dealing with?

So your answer means that there is 75 watts for that channel and that 75 is divided up amongst the sources correct? This is different than each source getting 75 watts at all times.

The x/o's with rear fill output are from DA Hex S600s. I wrote to DA tech support asking the same question (using the example of 150W/ch) before asking here and this is what they said:

"The power will be the same as what's going in, The RAF has the attenuation

feature to "pad" down the RAF output if its too loud, and you're correct the

impedance does not change. If your tweet is 4 ohm and so is the mid, they

will each get 150W.

If you run a full range 150 watts into the x-over, then the RAF will have a

full range out of 150 watts with attenuation control."

 

[helotaxi 5,000+ posts]

For all intents and purposes, both the tweet and mid will have full power available to them at all times. They are effectively a single driver with regard to the amp and power.

As far as the rear fill, the actual power going to the front and rear with the rears hooked up is going to depend on the design of the crossover and the final load that it presents the amp and what the amp can do with that load. I find it somewhat impossible to believe that they figured out a way to keep the impedance the same as the front drivers.

 

[dadood 10+ year member]

Ok thanks for the edu guys. As for the impedence load, what he was saying was that as long as the impedence of the RAF driver is the same as the component then impedence remains the same (I had asked him if RAF affects the impedence load).

Anyways, I have a JL 300/4 and I'm going to take my rear drivers off of ch3 & 4, bridge the front and rear channels so I'll be running 150W/channel to the S600s and hook up the rear drivers to the RAF output on the Hex x/o's and see if it sounds better than having each corner on a separate channel.