Mini 3-way (7l). f6 ~40Hz. Low distortion in midrange. Recommended PR PIR slopes. Inexpensive drivers and components. (Mechano325)

[BossBunos]

@XMechanik what is your personal sound impression of these compared to the mechno23? I've build a 2 way sealed speaker my self based on the sb26adc in a somasonus wave guide and the sb15nbac. The tonality is pretty similar to the mechano23 (that I also build, but mine has less extension of course) but both sound less open and darker than my salon2's. I wonder if this is due to a steeper slope of the power response of my own design and the mechona23 or maybe that IMD plays a role. This new 3-way you have made looks really impressive and has a way more shallow power response than the mechano23. So I wonder if you find these more open/less dark sounding that your mechno23. I'm still learning a lot and especially the effects of power response and DI and not so clear to me in regards to subjective impressions.

 

[XMechanik]

what is your personal sound impression of these compared to the mechno23?

Indeed, in my subjective opinion they sound a bit brighter, but I must also add that at least in my listening environment this is not something I really need to be happy.

 

[BossBunos]

I modified my crossover (of my own designed speaker) so the listening window is flat now and the on axis is slightly rising towards the top end. That transformed the sound quite a bit to more open/less dark (brighter?). I think i'll try to modify your crossover for sake of experiment. I want to replace the 15 ohm resistor on the tweeter for a 12 ohm. That creates an almost flat listening window and also reduces the slope of the predicted in-room. It does however reduce the smoothness of the power response. Then I can A/B those

 

[XMechanik]

I think i'll try to modify your crossover for sake of experiment. I want to replace the 15 ohm resistor on the tweeter for a 12 ohm.

Along with your modifications you may consider adding a paralell resonance circuit to reduce THD.
It should have resonance at woofer breakup frequency and it should be connected in series with the woofer. For example 0.1mH and 5.1uF would give f=1/(2*pi*(0.1e-3*5.1e-6)^0.5)= 7.05kHz (0.82uF cap becomes optional and can be removed)
Happy experimenting. Share your results when you're done, preferably in the Mechano23 thread.