Technical aspects of loudspeaker

The audio signal passes through the conductive belt and generates a magnetic field interacting with the permanent magnetic field around the conductive belt. This causes the ribbon to move back and forth, producing sound.

Instead of using a cone connected to a voice coil suspended in a magnetic field, the ribbon drive uses a piece of material (usually aluminum) as a diaphragm, suspended between the north and south poles of two magnets. Ribbons are often pleated to increase strength. The audio signal passes through the conductive belt and generates a magnetic field interacting with the permanent magnetic field around the conductive belt. This causes the ribbon to move back and forth, producing sound. In fact, the ribbon acts as both a voice coil and diaphragm. A ribbon can be considered as a voice coil extending to the length of the ribbon. These will affect the portable Bluetooth speakers.

 

 

In all other planar magnetic sensors, a planar or slightly curved diaphragm is driven by an electromagnetic conductor. The wire is connected to the back of the diaphragm, which is similar to the voice coil of a dynamic driver and is expanded in a straight line here. In most designs, the diaphragm is a piece of plastic with a conductive body bonded to its surface. The flat metal conductor provides the driving force, but it only accounts for a part of the diaphragm area. This kind of driver is also called a quasi-strip sensor. Figure 3 shows the difference between real ribbon and quasi ribbon drivers.

 

Although the designs of these drives are very different, they work the same (Figure 1). First, a simple explanation is that the current from the power amplifier flows through the driver's voice coil. This current forms a magnetic field around the voice coil, which expands and contracts at the same frequency as the audio signal. The voice coil is suspended in a permanent magnetic field generated by the magnet in the driver. The permanent magnetic field interacts with the magnetic field generated by the current flowing through the voice coil, alternately pushing and pulling the voice coil back and forth. Because the voice coil is connected to the driver's cone, this magnetic interaction pulls the cone back and forth to produce sound.

 

On a more technical level, a voice coil is a piece of wire wrapped around a thin cylinder called a voice coil former. The former is connected to the diaphragm (cone or dome). The current from the amplifier flows through the voice coil, which is installed in the permanent magnetic field, and its magnetic flux line passes through the gap between the two permanent magnets. According to the "right-hand law" of physics, the current circulates through the voice coil winding to produce a magnetic force along the axis of the voice coil. The interaction between the wave field of the voice coil and the fixed magnetic field in the gap generates axial force, which makes the voice coil move back and forth and carries the diaphragm. The faster the audio signal alternates, the faster the diaphragm moves, and the higher the sound frequency is generated. For obvious reasons, dynamic drives are also called dynamic drives.

 

Other elements of the dynamic driver include a spider that suspends the voice coil in place as it moves back and forth. The basket is a cast or stamped metal structure that holds the entire assembly together. (cast baskets usually appear in higher quality

wireless Bluetooth speakers, punching baskets in budget models.) A ring of a compliant rubber material called a surround connects the cone to the basket frame. The surround allows the cone to move back and forth while still connected to the basket. The maximum distance the cone moves back and forth is called its offset.

This article comes from:https://www.loudhop.com/


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