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New 3-way Speaker Build has finally started.

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I'm curious about how you decided upon cap and coil values, and why a 2nd order filter couldn't work for your mid (did you try a series cap/resistor across the low-pass coil?).

 

Personally, I would have chosen a larger mid, for possibly more comfortable crossover to both the woofer and tweeter.

 

If you feel like sharing, I'd love to hear more about your design process. Sure others would, too.

 

Sorry to hear about the distractive year - know the feeling well! (I also had father issues).

 

Thanks for your fascinating update.

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15 hours ago, BioBrian said:

I'm curious about how you decided upon cap and coil values, and why a 2nd order filter couldn't work for your mid (did you try a series cap/resistor across the low-pass coil?).

 

Personally, I would have chosen a larger mid, for possibly more comfortable crossover to both the woofer and tweeter.

 

If you feel like sharing, I'd love to hear more about your design process. Sure others would, too.

 

Sorry to hear about the distractive year - know the feeling well! (I also had father issues).

 

Thanks for your fascinating update.

Yes, happy to share my reasoning.  Every choice has it's pros and cons.

I went with this particular mid for a couple of reasons:

- It has extremely good off-axis response right across the pass-band that I wanted (and beyond).  I take particular note of 30deg off-axis response curves, as that is closest to the angle at which we do most of our listening. (unless using toe-in).  When originally researching midrange drivers I was surprised to see how many start to fall away soon after 1kHz on their 30deg response.

- Being primarily designed as a compact mid-woofer, it has very low Fs for its size, decent power handling and very similar sensitivity to the woofer.  Since I wanted a fairly low 350Hz crossover point, this all made for an extremely comfortable transition to the woofer using 2nd order filters.  Larger drivers that I looked at generally had higher efficiency and would have required attenuation.

- It has low inductance and an extremely tame impedance curve which is good for the crossover to the tweeter.

- It has very low distortion even at higher listening levels.

 

The only downside with this choice (AFAIK!) is that rise in the response above 3.5kHz that you can see in the driver response graph in yesterdays post.  Even in the 30deg curve, the peak at around 5.7kHz is 5dB above the level at 2k.  So up to that point, the 2nd order filter was merely flattening that peak rather than providing 6dB of cut.

I thought about filtering out the peak, but figured the cleanest solution with the most predictable results was to change the Mid low-pass and Tweeter high-pass filters to 4th order.  Values were obtained from the calculator on the mh-audio website which allows a good range of variables to be entered.

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