Talk:Acoustic transmission lines

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I have a few problems with the list of transmission line attributes

  1. virtually no sound emanating from the enclosure except the loudspeaker;

That is OK, but applies even more to a closed box.

I don't think that is correct. The port in a TL is tuned such that the port output is highest where the second electrical impedance peak is reached. Whatever this frequency is, most of it is then heard at the port. This contradicts #1, and a closed box would likely have more sound, not less, coming from the cabinet due to standing waves. Desmoid (talk) 18:57, 7 January 2008 (UTC)

  2. precisely defined imaging, particularly in the bass region and vocals;

This is not a function of transmission line loading. This is to do with the detailed design of the speaker, particularly for vocals which are generally above the band where TL operation becomes dominant.

  3. precicely timed bass without echo or reverberant 'booming';

Bass timing is a function of many factors, of which the box is just one. Any speaker is resonant and a TLS is no less so than any other. As for reverberation, that does not apply in a space so small and well damped as a speaker enclosure.

  4. excellent transient response and uncompressed dynamics;

Transient response is a function of the upper part of the response curve, not the bass. So things like crossovers and phase matching with tqweeters determine transient response. Dynamic compression has absolutely nothing to do with transmission lines. That is a function purely of the driver design.

  5. typically, extended bass below a half wave frequency of the reflected line length e.g. 30Hz=8foot length;

No. The bass extension depends solely on the resonance frequency of the driver, provided the TL is long enough.

  6. typically, even loudspeaker-impedance, from the unchanging consistent load(no reflection resonances);

Again no. A good TL will leave the resonance of the driver unchanged. That means a large resonance peak at the primary driver resonance. Reflection resonances will occur with a TL speaker to just as great an extent as any other, since it must couple power to the room.

  7. high efficiency.

The efficiency of a speaker is determined solely by the design of the driver. You cannot change it with the cabinet loading design.