Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Since the 2123J driver is a 16Ω driver, it will be less voltage sensitive than the 8Ω driver, and will produce less sound pressure at a given drive voltage. So the level of padding required will be reduced as a result.
Midrange padding is accomplished using R4 and R5. You will notice that R4 is 4Ω in series and R5 is 8Ω in parallel. These value provide the right amount of attenuation for the 8Ω driver.
If you wanted the same level of attenuation for a 16Ω driver, you would double the values to 8Ω and 16Ω, respectively. This is the same ratio, and creates the same voltage division, so provides the same attenuation.
But since the 16Ω driver is less sensitive with respect to drive voltage, we actually need to change the ratio. I would probably use 4Ω R4 and 40Ω R5. Try those values and measure to verify. As I said earlier, you may be able to remove the padding altogether.
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