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Romy the Cat wrote:

Any LF acoustic system has two SPL levels: the SPL of pressure and the SPL of tone.

Ahhh! Very good Romy. I don't recall you talking about Pressure and Tone SPL before. The tapped horn can be designed any 3 ways. It can be balanced, tone heavy, or pressure heavy. The Tang Band push-pull tapped horn is pressure heavy and is best used below 60Hz. The 8PE21 tapped horn is tone heavy and light in pressure. The most balanced tapped horn I built was one using a B&C Speaker 12PS100 woofer. Since I have built several different kinds of tapped horns, I've now kind of have a feel for what they will behave like. It is worth saying that your room will also determine how balanced the tapped horn should be. Larger rooms need to be a little more pressure heavy so by the time the room is properly pressurized, the tone is present. If the tone comes forward too soon, then the tapped horn becomes fatiguing to listen to. On the other hand, there is nothing more boring than a tapped horn that has no tone SPL.

Even so, the bass that the tapped horn makes is still more directional than a fart-machine subwoofer. You can steer the bass where you want it. I see this as an advantage over other kinds of bass.

Rgs, John

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