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Sanitarium wrote:

Hi again,
Anyone here have experience with Aperiodic vented sub enclosures? It
seems like an easy way to get more low end out of a smaller than optimal
enclosure. Richard Clark was doing this in the late 80s. His aperiodic
vents were around $200 / pair and way out of reach for many.

Parts Express sells a Scan Speak vent for relatively little money.

What are the pros/cons to this design? Thinking about giving it a try.

thanks,
Garrett

I've tested the AutoSound2000 device and, well, it was underwhelming. It had a
fibrous pad that you placed over the front of a woofer that added some
mechanical damping along with a EQ device that pretty much restored the lower
end output lost by the damping pad.

I also listened to it by placing the pad on and off the face of a 12-inch
woofer installed in an infinite baffle arrangement in a Honda CRX. The net
result was that I was unabl etohear any change in response with/without the
pad. There were minor (less than a dB at 30 Hz) measured differences but
overall the sound of the system was identical with/without the pad and EQ.

There's another type of 'aperiodic' approach that generally involves installing
a small leak in a sealed enclosure. Audio Concepts used to do this. In the
early 70s Dynaco had a port/stuffing system said to be aperiodic; but none of
them had any special performance quality that could be 'caused' by the
technique as far as I could tell.