Your Details for the Proper LourdboxUsage

Your Details for the Proper LourdboxUsage

The loudboxes are the centerpieces of any loudbox. A speaker can produce sound without a speaker, but it is the combination of one or more speakers with a cabinet that gives the speaker. As far as the manufacture of loudboxes is concerned, many technologies coexist. We will try to shed a simplified light on these different technologies of sound emission.

The Loudboxes

The electrodynamicloudbox

This is the most common. It uses a membrane integral with a coil immersed in a magnetic field. The shape of the membrane depends on the frequencies to be restored: cone for the bass and midrange registers, rigid or flexible dome for the midrange and treble. There were experiments with flat membranes, but the results were disappointing. A cone loudbox has a membrane that must be as rigid as possible. It is held in place by 2 suspensions: the device visible from the outside and the back called a spider, which keeps the coil perfectly centered in the gap. The half-roll suspensions offer a great journey, essential for small diameter speakers. The pleated paper suspensions are more rigid and mostly used on large diameter speakers. The membrane itself can use a lot of materials. Each constructor has its own methods with paper, coated or not, fiberglass, carbon, composites, ceramic cones, etc. The use of comes important here.

Examples of electrodynamic speakers

Examples of electrodynamicloudboxes: on the left, a flexible dome tweeter charged to reproduce the high frequencies, on the right, a medium-bass with a composite membrane.

Just be aware that each speaker has a global behavior, summarized in small’s characteristics, and that all technologies have their qualities. when they are well used.

The dome speaker

Dome speakers exist with and without throat adaptation. Mounted flat, the dome radiates very widely and offers a good transient response. Placed in the center of a phasing surface, efficiency is improved and directivity better controlled at different frequencies. The field, very wide, limits the range of tweeters and dome-shaped mediums to a few meters.

The compression speaker

Compression loudboxes use a metal dome membrane loaded by a horn via a phasing piece. The pavilion greatly improves performance and directivity. The latter is much smaller (60×90 ° for Tractrix, 120×90 ° for diffraction and Iwata), but much better controlled. The range is also much better.

By comparing two speakers, one with a dome midrange and the other with compression, we find:

  • A balance roughly equivalent to 2 m of speakers,
  • A very downward balance for the domes from 5 m while the compressions keep the same balance. The bass is more present when you are far from the speakers, compressions are more linear when you are more than 5 m from the speakers.

The coaxial speaker

2-way speakers typically have 2 speakers placed one above the other. For better sound propagation, positioning on the same vertical axis is desirable. Some manufacturers have developed coaxial speakers in which the tweeter (high-pitch speaker) is placed in the center part of the woofer.