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He says it effectively increases the Q and essentially dials down output around the Fs.
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I suppose it would indeed dial down the output at Fs, but it sounds like a terrible idea to me.....
Normally, all the voltage you supply from your amp will be across the driver. The output impedance of the amp is extremely low, so it acts as a voltage source.
When you add a resistance (not an impedance), it becomes a fixed resistive divider set up between the impedance of the driver and the resistor.
Examine what happens when the drivers impedance is at 4 ohms. The drivers impedance of 4 ohms and the 4 ohm resistor are in series, which effectively divides the maximum voltage you can develop across each component in half.
This doesn't unfortunately divide the power dissipated by each by half, but by about a quarter of what the single driver dissipated, because power is the square of the voltage divided by resistance.
Simply put, the volume will be much lower with two devices in series and you'll have to turn it up a lot more to get the same volume you enjoyed without the wasted power you're dumping into a resistor that produces no sound.. and you're worried about clipping....
In addition you are feeding more noise floor.
Anyway, off the top of my head this sounds goofy...
brucek