electronic crossover and a NOTCH Filter

[mitchyz250f]

Has anyone used these with an electronic crossover and a NOTCH Filter so that these could be run to 6K or so?

Would this affect sensitivity.

[Dr.EM]

I think some information is missing? Is there a particular driver you want to run to 6kHz?

You are talking about an active line level electronic crossover I presume, but with addition of notch filters to control driver breakup? If this is the case, sensitivity is unaffected (level at the notch freq is naturally reduced!)

I have used one, in my case to control the breakup of a metal coned woofer (Hi-Vi M8a), works very well. Here is the schamatic for the circuit I used:



When designing your own filter as a rough guide the ratio of R4 and R3 controls notch depth (attenuation), C2 effects notch frequency and C1 notch width, but all of these are quite interactive so I reccomend you check it in software like this

[mitchyz250f]

The speaker is a Dayton RS52 dome midrange. It has nasty breakup at 13000Hz or so.

[Dr.EM]

Ah, well that is the same midrange driver I am using!

I tried a 13khz notch but in practice it didn't seen very required. I also found that it added a lot of noise and seemed to resonate a bit at the 13khz frequency, though that may have been in part due to the breadboard construction. I decided it was such a high frequency that it wasn't of much concern in my application.

Anyhow, in my application I am crossing over at 4.7kHz with 24db slopes. If you are going for 6k at 24db you should be ok, though 6k with less than 24db might be an issue. I found the filter created phase shifts even at my crossover point, so look out for these. Here is the schematic for the filter I tried (values needed altering on breadboard due to stray capacitances):

[mitchyz250f]

Wow, All my questions have answered.

Mitch