Hello, with my two latest speakers i've built (My own ported design with Sica 5,5C1,5CP and the small Hinson cube speaker from DIYRM on facebook) I've used together with DSP amps, and I've given the speakers a big boost below the drivers Fs (and the ported sica cabinet below Fb) and like what I hear. I'm clearly trying to extract lower frequencies out of the speakers at the expense of SPL. I remember reading about subwoofers with what I think is called "b6 assisted alignment" on speakerplans some time ago and found a formula from old time trusted member djk in this thread https://forum.speakerplans.com/don-keeles-vented-box-formulas_topic41578.html
It's supposedly doing what I have been trying to do but in a more controlled manner (and with the possibility to simulate the speaker), trying to extract low frequencies out of small cabinets with a filter/EQ boost. On my neverending quest for lower bass I started looking at drivers (best with a Qts of .312) and low tuning and I found the SB15CAC30-4 which looked interesting. I simulated according to the formula (Qts^2)*Vas*4.5 = box size. Fb should be (Fs/Qts)*0.312. I think I can understand the beauty of the alignment from the simulation in hornresp, however I got what I think is the port resonance way lower than I had hoped, I wanted to make this a 2 way cabinet and hoped for the 5" driver to be able to meet up with a tweeter somewhere in the 2500-3500hz region, but the port resonance is already showing around 300 hz. Is this alignment not suited for 2 way speakers like this? Should I avoid building with the port resonance audible like this? Thanks for any assistance. I'm a noob at this so please bare with me.
It's supposedly doing what I have been trying to do but in a more controlled manner (and with the possibility to simulate the speaker), trying to extract low frequencies out of small cabinets with a filter/EQ boost. On my neverending quest for lower bass I started looking at drivers (best with a Qts of .312) and low tuning and I found the SB15CAC30-4 which looked interesting. I simulated according to the formula (Qts^2)*Vas*4.5 = box size. Fb should be (Fs/Qts)*0.312. I think I can understand the beauty of the alignment from the simulation in hornresp, however I got what I think is the port resonance way lower than I had hoped, I wanted to make this a 2 way cabinet and hoped for the 5" driver to be able to meet up with a tweeter somewhere in the 2500-3500hz region, but the port resonance is already showing around 300 hz. Is this alignment not suited for 2 way speakers like this? Should I avoid building with the port resonance audible like this? Thanks for any assistance. I'm a noob at this so please bare with me.
