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OK, as now, I see no problem to conclude to the project successfully in 1-2 weeks. The horn give much less problem then was expected, as my progress with crossover going on the midbass horns sound more and more disciplinized. Today I will be exploring the option to roll off the upperbass lower end vs. extending the midbass upper end. The crossover I use is not too comfortable for those tasks but I will survive it.

There is one aspect that at this point is not resoled and I would need to deal somehow. I do not have a position how to proceed at this point so, I will lay out all options. The problem is that my Vitavox 15 driver has too light cone/too strong suspension for this type of horn. The current setting has 43.7Hz of primary resonance. To keep everything as I understand it perfect I would like to have 35-40Hz primary resonance and then to lock it at 42 Hz with large a back chamber. With 43.7Hz I have no spare Hz to close up the back of the horn. So, here is the options I have how I might deal with the problem.

1)  Leave it as is. The 43.7Hz is near OK primary resonance for these horns. If I built a very large fiberglass-made sarcofague around the back end of the horns then I might be OK to keep horns unclosed from behind. This is what I am doing for now.

2)  Find another driver with free air primary resonance of near 40Hz. Possible and I can always do it in future.

3)   To glue to the driver some mass to drive the primary resonance down. This is not brainer was to do it but I have no collage how it will affect the driver sound. I am sure the motor will handle it but to impact the driver paper is a bit dangers. Also if I do it then what material and what techniques to use.

4)   Soften the driver suspension by soaking the outer spider with minerals. Again, it might fuck up the driver, not to mention that it will be stiffening back with time goes by

5)  Introducing artificial impediments in the mouth or near the mouth that would reflect a part of the horn pressure back to the horn belly and introduce more aggressive throat reactance. This will drive the primary resonance down but it might also modify the sound of the horn.

6)  Trying to change loading of output tube of the amp the drives the midbass horns. Currently the 6C33C is load to 1500R with midbass horns. I wonder if change of loading will slightly alter the primary resonance

If anyhow know any other ways to drop primary resonance then, please, advise.

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