| | foxfire3
Bill, I'm not trying to come up with a crossover right now.
I'm measuring the drivers' responses and phase so I can import them into crossover design software later.
My question is really why the paralleled response is lower in level than the individual responses?
Ok, to get frequency and phase response you only need the individual drivers responses which should be referenced to the system you are using to measure it. It's only after you get these figures that it enables you to design the crossover and then you can get the full system frequency vs phase response.
In effect your parallel response is lower because the load you are applying to the amp with a simple 30 microfarad cap is not good. Assuming the drivers are 8Ω then you are effectively crossing over around 700 to 800 Hz.
For accurate crossover design software you really need to obtain the Theile/Small parameters and model your drivers and then choose a suitable crossover point.
Without the Thiele/Small parameters you either need to measure the individual drivers response and design the system from there, or you need to measure the combined response with a "best guess" crossover in place.
Unfortunately there are no shortcuts that will give meaningful results as you have demonstrated.
Can you tell me the driver models and manufacturer so I have a better idea as to how they will interact?
PS A 10 microfarad cap and 0.64 millihenry inductor should only set you back a couple of dollars to do some preliminary measurements.