Depends what the driver is, what you're crossing it to, what your goals are for frequency, impedance, polar responses are etc. Just from the FR and impedance plots, ideally no > than about 400Hz to avoid the energy storage indicated, but as said, that's completely dependent on circumstance & objectives, without which we're 'flying blind'.
This an 8 inch driver and it's impedance. Wanted to know if it can be used from 100hz to 1k? For use with a CD
I was asking what the driver is? 8in covers quite a lot of possible units 😉
You can probably use it, depending on those frequency & impedance graph scales, if you don't mind some energy storage & raised harmonic distortion -how much so depending on the degree of resonance (unknown since the graph scales are missing) the quality of the motor design etc., which is why I asked what it is -as in manufacturer, model name / number.
You can probably use it, depending on those frequency & impedance graph scales, if you don't mind some energy storage & raised harmonic distortion -how much so depending on the degree of resonance (unknown since the graph scales are missing) the quality of the motor design etc., which is why I asked what it is -as in manufacturer, model name / number.
The plot doesn't tell me much but an 8" is ordinarily ok at 1kHz. You might need to take it a little higher to meet a CD, or use a larger woofer.
You need of axis response to exactly decide that. I cross before beaming and breakups.
12 dB/octave (second order) low-pass filter at 2 kHz with RLC notch filer at 4 kHz.
I crossed 8" @ 2khz 24db to a small compression driver, worked well.
But a 6.5" woofer sounded better.
Perhaps due to better off axis response all the way up to 2khz, maybe more pistonic up to 2khz, idk.
But the more I do this, the more i agree with cross a 15" @ 800hz, a 12" @ 1.2khz, an 8" @ 2khz.................
Now getting a tweet (and or horn) to get down that low with minimal reflections, that gets interesting................
But a 6.5" woofer sounded better.
Perhaps due to better off axis response all the way up to 2khz, maybe more pistonic up to 2khz, idk.
But the more I do this, the more i agree with cross a 15" @ 800hz, a 12" @ 1.2khz, an 8" @ 2khz.................
Now getting a tweet (and or horn) to get down that low with minimal reflections, that gets interesting................
Ciare class it as 50mm / 2in, so I make it a 2.193KHz point source HF corner from the coil diameter & an optimum XO frequency of 269Hz [nearly], with the next up at 768Hz & the three following ranging from 1.298KHz - 1.923KHz. Upper piston corner from the rated Sd appears to be 663.4Hz.
Sticking my neck out, since Ciare usually have reasonable motors & sensitivity is decent, I'd probably pick the 768Hz / 800Hz as a compromise upper BW limit, since it makes (passive) filter design less expensive than right down low, & accept there's a bit of energy storage going on -it's got company enough on that front after all. 😉
Sticking my neck out, since Ciare usually have reasonable motors & sensitivity is decent, I'd probably pick the 768Hz / 800Hz as a compromise upper BW limit, since it makes (passive) filter design less expensive than right down low, & accept there's a bit of energy storage going on -it's got company enough on that front after all. 😉
Thanks! I have a tendency nowadays to miss the 'hidden' posts. 
OK but what horn/waveguide? Are you going for a DI match at crossover? That seems low for a typical 90 degree waveguide with say a 15" woofer. You have any measurements on the CD horn combo to see how well it supports an 800Hz crossover point.
Rob 🙂