Over the years, amplifiers have evolved significantly and today they are much more than an electronic device for managing audio signals. Today, amplifiers use digital switching supplies instead of the traditional linear power transformer based supplies. This has enabled them to shed about half of their weight. Today, amplifiers weigh between ten and twenty two pounds. Over the years, various circuit designs have emerged. These include AB designs, Class G designs, Class H designs, and Class D designs.
Popular choices for compression drivers, AB designs provide medium efficiency low distortion at moderate power levels for high fidelity. Using the input audio signal, Class D amplifiers employ Pulse Width Modulation. The purpose of these amplifiers is switching the output devices at ultrasonic frequencies and then using a low-pass filter to filter these frequencies. These amplifiers cause minimal distortion, have good frequency response, and are extremely efficient. A second output stage is what Class G amplifiers utilize. When louder input signal require it, these amplifiers turn on the second output stage. The input audio signal controls the DC power supply of Class H amplifiers that use a single output stage.
The last but definitely not the least of the amplifiers introduced in recent times are Class D amplifiers. High audio performance and high efficiency are the two things you can expect from these amplifiers. Today, amplifiers encompass have many ‘modern’ day capabilities. An example of such amplifiers would be a Bluetooth amplifier that allows you to stream music from your computer, tablet, or cell phone to your speakers. These amplifiers are lightweight, feature state of the art technology and have an advanced audio receiver.
Furthermore, they deliver a good amount of RMS power to your speakers, ensure low audio distortion, and enable energy efficiency. Some of these amplifiers even feature in-built cooling systems. However, the best and important thing about these amplifiers is the high quality music that they produce. If you’re looking for a ‘modern’ day amplifier then there isn’t a better choice than Zapco’s ST-D BT amplifiers. Housed in a small chassis, ST-D BT amplifiers produced big power. Apart from being powerful, these amplifiers produce great sound. These amplifiers encompass all the advanced features such as a dash remote control feature and Bluetooth streaming capabilities. With these amplifiers, you can stream music to your speakers from your iPad or Smart Phone. Furthermore, they have preamp outputs, RCA and speaker level inputs, bass boost, and crossovers.
ST-D BT amplifiers are extremely efficient. You’ll find two 4-channel units with 640W and 320W RMS. You’ll also find 2, 4, or 5– channel with 1100W RMS. Fortunately for you, Atrend is taking orders on these items.
These amplifiers are available on Atrend’s website. Atrend is the master distributor for amplifiers, subwoofer, coaxial, component speakers, crossovers etc, and you can find information about these products on their website.