Is this the new Drain Tuba?
Posted: Wed Sep 07, 2022 7:32 pm
BillFitzmaurice.info
Loudspeaker Design
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Is this the new Drain Tuba?
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Re: Is this the new Drain Tuba?
Posted: Wed Sep 07, 2022 9:58 pm
Re: Is this the new Drain Tuba?
Posted: Wed Sep 07, 2022 11:39 pm
Re: Is this the new Drain Tuba?
Posted: Thu Sep 08, 2022 9:21 am
I built a bass reflex out of a 40" long piece of maybe 20"? wide PVC. The calculated ports were so damn big I tried running them OUTSIDE of the enclosure. Does that screw things up? (I mean screw them up any more than using BR in the first place. )
)Re: Is this the new Drain Tuba?
Posted: Sun Sep 11, 2022 4:34 am
I've only found problems with simulating bass reflex when either the port is long enough to have its own resonance in the pass band or the box is deep enough that the back causes a half wave cancellation in the pass band. Beyond about 2.5 feet deep.
I mean if you have a port as wide as the box it becomes a tuned quarter wave enclosure. If you flare it enough it's a rear loaded bandpass horn!
As for using a bass reflex instead of a horn, well when you start getting small like a tuba 24 the horn becomes less efficient - e.g. only 90dB efficient (low bass) when a bass reflex of the same size is 98 dB efficient which is why I didn't go with a single tuba 24 in my limited space vehicle, but if you have room for the bigger horn cabs go with them.
I mean if you have a port as wide as the box it becomes a tuned quarter wave enclosure. If you flare it enough it's a rear loaded bandpass horn!
As for using a bass reflex instead of a horn, well when you start getting small like a tuba 24 the horn becomes less efficient - e.g. only 90dB efficient (low bass) when a bass reflex of the same size is 98 dB efficient which is why I didn't go with a single tuba 24 in my limited space vehicle, but if you have room for the bigger horn cabs go with them.