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RE: Nope.

In my experience the strongest reinforcement comes at the frequency where the line is 1/2 wavelength long due to the backwave adding in-phase with the frontwave. But unfortunately there will also be a dip in the response at the frequency where the line is 1 wavelength long, as now the backwave energy emerges out-of-phase with the frontwave. By stuffing the line the energy that causes the 1 wavelength dip is attenuated, but so is the energy that is beneficial down at lower frequencies. Too much stuffing and you will not get usable bass extension down to the 1/4 wavelength frequency. So, it's a juggling of tradeoffs.

A transmission line enclosure with the line closed off at the end (instead of open) is really just a well-braced sealed box. I do recall reading that the theory was based on the idea of an infinite line length (probably in Bailey's original article), but don't think that was much more than talk. The idea all along was to use the backwave energy to reinforce the bass - as you very correctly point out, why waste it? I wouldn't be surprised if the misnomer "transmission line" stuck mainly because it sounds so cool.

Duke


Edits: 09/11/07
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