Hi. This is probably a dumb question, but I'm cobbling together a pair of presence speakers using existing drivers and parts I have lying around.
I want them to operate only from 500Hz up, and I want to cross from the midrange to the tweeter at 2kHz.
I have a pair of existing existing 500Hz and 2kHz high-pass filters already built up from a different project few years ago, so should I take the 2kHz filter feed to the tweeters directly from the amp's full-range output, or daisy-chain it off the 500Hz filter?
Thanks.
I want them to operate only from 500Hz up, and I want to cross from the midrange to the tweeter at 2kHz.
I have a pair of existing existing 500Hz and 2kHz high-pass filters already built up from a different project few years ago, so should I take the 2kHz filter feed to the tweeters directly from the amp's full-range output, or daisy-chain it off the 500Hz filter?
Thanks.
Your existing crossover will not fit the impedance and frequency response of the new drivers. However, if you just want to 'make noise', it will protect your drivers from getting too much power (unless, well, you crank it up too much).
No, connect it parallel to the input.
"The loading would change, can't readily say whether that's better or worse. What filters are they?"
-They're simple 12dB/octave inline filters, in series with the driver, each with a single cap and an inductor, intended for 8-ohm drivers The midrange and the tweeter are both 8-ohm.
-They're simple 12dB/octave inline filters, in series with the driver, each with a single cap and an inductor, intended for 8-ohm drivers The midrange and the tweeter are both 8-ohm.
If you just high-pass the midrange at 500hz and high-pass the tweeter at 2khz then both will play frequencies above 2khz. That is probably not what you want, as the midrange may not sound good so high up and there will be interference.
Cascading the filters will effectively - to a rough approximation - turn the tweeter’s high-pass into a 4th-order filter below 500hz, providing a marginal amount of additional protection for the tweeter, but you need to model it to know how it will affect the cutoff frequency & phase curve.
To properly cross from the midrange to the tweeter at 2khz you’ll also need to low-pass the midrange at 2khz. Two high-pass filters won’t do it for you.
Cascading the filters will effectively - to a rough approximation - turn the tweeter’s high-pass into a 4th-order filter below 500hz, providing a marginal amount of additional protection for the tweeter, but you need to model it to know how it will affect the cutoff frequency & phase curve.
To properly cross from the midrange to the tweeter at 2khz you’ll also need to low-pass the midrange at 2khz. Two high-pass filters won’t do it for you.
"That is probably not what you want, as the midrange may not sound good so high up and there will be interference."
Good point. I'd wrongly assumed the mid would fall off quickly, but I took a look at the chart and it's pretty much flat to 7kHz and then bounces around a bit at a pretty high output all the way to ~20kHz.
Thanks.
Good point. I'd wrongly assumed the mid would fall off quickly, but I took a look at the chart and it's pretty much flat to 7kHz and then bounces around a bit at a pretty high output all the way to ~20kHz.
Thanks.