swtnate
500+ Head-Fier
1mm ID on CI strips the driver of so much warmth and character. Damper effect is more pronounced the closer to the sound bore, further away from the nozzle. CI has such a big engine! Nothing really replicates. What you will have to balance is overall loudness. CI and ED can really overpower the tweeters. If you put the tweeters closer to the sound bore, you will introduce acoustic phase issues as the higher frequencies will reach your ear drum much faster than the longer wave signature of the lows. I would recommend using 1.5-2mm ID tubing for all drivers. Cut tube lengths to 20mm long. Place your damper in the tube and measure how far from the nozzle it is placed. Attach them to the driver and test the FR with your test mic. Keep trimming the tubing(s) until you get the right response. Lastly, combine them all and test the whole IEM. Tweak your design from there.
So, based on your advice, would this be the go-to design? Cap values based on what I have (0.22 uF) and what I can find online (4.7 uF). Also, advice on tube length and damper choice if you can. I thought of putting the SWFK as close to the nozzle as possible and the CI with a 1mm ID tube and heavy damper a long way from the nozzle, but professional advice is appreciated. Thanks
Note: these FR’s will move around A LOT based on variability in source impedance. However, these will be “close”.