Location: Goa, India
Posts: 143
I'm Denzil.
Location: Goa, India
Posts: 143
I'm Denzil.
Location: Goa, India
Posts: 143
I'm Denzil.
Yes, I know that reducing port length will raise the tuning frequency. My gut feeling is that the ports are not really working as tuned ports with the aperiodic shelf in place. I think ports need a certain velocity, speed of air in order to work as tuned ports. With the aperiodic shelf the velocity will be reduced considerably and they will probably only act as vents.
Denzil
https://www.instagram.com/elsewheregoa
Location: Goa, India
Posts: 143
I'm Denzil.
Yes Macca, there's no point in having any length of port in a aperiodic cabinet. However the Tannoy York aperiodic shelf cabinets did have a shallow port which may only have been there for aesthetics. I will eventually remove the ports. Because they also reduce the volume of the cabinet unnecessarily. But I need help to remove the ports and with social distancing, that will have to wait.
I'm going to leave the rock wool in the lower section because I do believe it's reducing the boom.
Thanks,
Denzil
https://www.instagram.com/elsewheregoa
You could experiment with temporarily blocking the ports. Some speakers work well with sealed boxes. You'd get a slower bass roll-off and possibly more extended bass at the cost of reflex reinforcement. If you can locate plastic document mailing tube stoppers the right size, try those. They can always be BluTacked in place.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Location: Goa, India
Posts: 143
I'm Denzil.
Ah well. That could be because the drivers have a fair degree of self damping (powerful magnets and stiffish cone surrounds). I'm wondering if a resistive port might offer something? Goodmans did an ARU that worked that way, but for 12 inch drivers as I recall.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Location: Goa, India
Posts: 143
I'm Denzil.
Yes Geoff, it's called an aperiodic port. In the case of Tannoy, they used a aperiodic shelf (with a resistive felt sheet on the shelf), which I had put in and then taken off. That's the topic of this disconnection which you may not have realised because of what we are calling it "aperiodic shelf)
Regards,
Denzil
https://www.instagram.com/elsewheregoa
Used to be called variovents
Regards,
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