Hi Rob,
You've correctly deduced the ( new ) LC values from the old .
But no, the acoustic output won't be the same due to your using a diaphragm with a higher impedance ( than the original design ).
Your derived LC values will duplicate the OEM slope & shape / but at a reduced level .
And ( to further complicate matters ) there's no padding ( in the form of resistors ) to re-adjust that HF output back upwards ( there's no Lpad because all the db loss is accomplished by the LC values ) .
One piece of good news is that most of this db loss ( in the HF leg of this network ) is determined by the very first capacitor ( ie; 2.2uF in the SR schematic ).
- You can double it's size ( even triple it ) to effectively turn up the complete horn/driver combo.
- The (following) stock coil & much larger cap, ultimately determine the shape of the "knee" around the crossover point .
- You may need to play with the coil size a bit ( varying it between .56 & .8mH to get the flattest "knee" .
One way or another, be prepared to play with the LC values until it sounds correct ( assuming you can't measure things ).
Remember, this SR circuit that you're using wasn't meant for your 2305 ( Potato-Masher ) or for the higher impedance driver that you've opted to use ( so, some component fudging is required ).
PS; I'd first try; 3.3 uF, with .62mH, then 18uF, followed by the 15R-6uF combo.
See my pic ( Right-Click to open to Full-Size ).
- Remember ( when playing with caps ), you can directly add the cap values ( in parallel ) to make up any value.