Greater than 20dB gain at DC with Linkwitz Transform - bad?

[consort_ee_um]

whoops I didnt spot that its a closed box design, the sixth order is of course a ported design. Is your box only 10 litres? Could you even fit 2 drivers in a 10litre box?
For the Keele alignment and a single SX10 driver you end up with a box of 60litres with a 3db point of 19Hz but its hardly a small box

[Jim85IROC]

My goal is to make a very small cube, similar to the Sunfire subwoofer that Bob Carver sells. While I haven't determined any exact dimensions, I estimated that once I fill up some of that cube's volume with drivers and a plate amp, I should be able to achieve a 10 liter volume without much difficulty.

Of course, as I mentioned, right now this is all theoretical just to determine whether it's worth dropping the time and money into the project.

[AndrewT]

Hi,
remember the conflicting requirements

low frequency extension.
high efficiency.
small speaker.

You cannot more than 2 from that list.
Do it badly and you might only manage any one from three.

[richie00boy]

Also bear in mind that with really tiny boxes, once you start fitting massive excursion drivers the box volume becomes dynamic, leading to poor distortion performance.

[Ron E]

Originally posted by richie00boy
....the box volume becomes dynamic, leading to poor distortion performance.

Perhaps a clearer way of stating that is that the box compliance becomes nonlinear. This is generally neglectable as long as driver swept volume (one way=Sd*Xmax) is less than 10% of box volume.