--- title: Benefits of a Class D Amplifier description: A class D amplifier is an economical solution that can increase the performance of an audio system, especially when DSP is incorporated. image: https://blog.miscospeakers.com/hubfs/Benefits%20of%20a%20Class%20D%20Amplifier.jpg --- [Skip to main content](https://blog.miscospeakers.com/class-d-amplifier#main-content) Menu [![misco speakers custom audio solutions](https://blog.miscospeakers.com/hubfs/MISCO%2075th%20anniversary%20logo.svg "misco speakers custom audio solutions")](https://www.miscospeakers.com/) [800-276-9955](tel:+18002769955) - [Get a Quote](https://info.miscospeakers.com/support/get-quote) - Case Studies - [Commercial Sound](https://info.miscospeakers.com/sh-acoustics-case-study-0) - [Gaming](https://info.miscospeakers.com/yfageo-audio-case-study) - [Hi-Fi](https://info.miscospeakers.com/concierge-audio-misco-rms-one-luxury-speaker) - [Musical Instruments](https://info.miscospeakers.com/little-walter-amps-tonespeak-speakers-download) - 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One place you can save a bit of money is by selecting the right amplifier. Thanks to advancements in microprocessors, amplifiers today can do some pretty amazing things. ## Amplifiers Explained At its most basic level, an amplifier is needed to increase the low-voltage signal coming from your audio source to be strong enough to power the mechanical movements of a speaker to create sound waves. Initially, when they were first invented, amplifiers used Class A circuit topology which used vacuum tubes (to control power delivery according to the input signal) that had a constant power source and output transformers connected directly to speakers. This made amplifiers rather large and heavy, susceptible to noise, and potentially unreliable. Also, these older amplifiers were terribly inefficient, wasting up to 75% of the consumed power as heat. This required large heatsinks to prevent thermal runaway and could damage speakers if not carefully monitored. ![Lee De Forest’s audio amplifier prototype 1914](https://blog.miscospeakers.com/hs-fs/hubfs/unnamed%20(5).png?width=306&name=unnamed%20(5).png) Caption: Lee De Forest’s audio amplifier prototype, circa 1914. ![Fritz Lowenstein’s audio amplifier circuit 1911](https://blog.miscospeakers.com/hs-fs/hubfs/unnamed%20(4).png?width=356&name=unnamed%20(4).png) Caption: Fritz Lowenstein’s audio amplifier circuit, circa 1911. With the advent of the transistor in 1947, vacuum tubes were quickly replaced in many amplifiers with metal-oxide-semiconductor field-effect transistors (MOSFETs) by the 1970s. This allowed for much smaller amplifiers, but for high power output, many MOSFETs were needed, as was a large on-board transformer and heatsinks to keep the MOSFETs cool. Class AB amplifier circuits became more popular and increased efficiency to around 70% while retaining most of the audio quality of the less efficient Class A circuit. [Class D amplifiers](https://store.miscospeakers.com/products/class-d-digital-audio-amplifiers) work differently. They operate digitally, switching the output on and off very fast. So fast, infact, that the impulses they emit simulates an analog signal into a loudspeaker well enough that a listener can’t tell the difference. They have come a long way from their 1950s invention date where the first Class D amplifier’s power output was only 2.5 watts. In 1978, Sony introduced a Class D amplifier with switch mode power supply (the TA-N88) that output 320 watts.  They are now over 90% efficient, come packaged as an integrated circuit, and can save you money (and/or engineering work) when figuring out how to power an audio system. Class D amps are generally smaller (the MISCO [38036](https://store.miscospeakers.com/pcb-amp-module-with-lead-set-12-usb-cable-38036) is less than 2¾” square), lighter, produce less heat (often not needing heatsinks), and generally last longer than the other kinds of amps. Switch mode power supplies, used with Class D amplifiers, have also decreased in size to the point where a 100 watt power supply footprint is smaller than the average cell phone. ![Texas Instruments’ TAS5731M Class D Amplifier IC](https://blog.miscospeakers.com/hs-fs/hubfs/unnamed%20(3).png?width=512&name=unnamed%20(3).png) Caption: Texas Instruments’ TAS5731M Class D Amplifier IC. Take advantage of the space and weight savings, while also taking your audio system to the next level; select a Class D amplifier that has DSP capabilities, such as the [MA-2105P](https://store.miscospeakers.com/2-1-channel-90w-plate-amplifier-with-dsp-93106). Digital signal processing (DSP) is like adding a state-of-the-art mixing board to your audio system. It allows you to manipulate a source signal in many ways to achieve your audio goals.   ## Bi-Amping A multi-channel class D amp (such as the [MA-4101](https://store.miscospeakers.com/2-2-1-channel-175-watt-misco-amplifier-93108)) can save you money in an audio system through a process called bi-amping. This is where you send one channel from the amp to a tweeter (the higher frequency sounds) and another channel to a woofer (the lower frequency sounds). Of course, you always want the specific frequencies sent to the speaker that was designed to handle them best. Historically this was done by a passive crossover which uses resistors, capacitors, inductors, or some combination of all three. The advantage of a passive crossover is that it doesn’t require power–it just happens automatically inside a system. The drawback to these components is that they can add significant cost to the creation of an audio system.  If your amplifier has DSP, you won’t need to use a passive crossover. The [DSP can be programmed](https://blog.miscospeakers.com/audio-dsp-crossover-solutions) to send the right frequencies to the corresponding speaker. This eliminates another issue with passive crossovers. They impart phase changes onto the signal, which can smear stereo imaging (the ability of speakers to recreate the placement of instruments and singers in a recording). DSP can also be used for filtering, frequency equalization, and dynamic range control. ## The Right Amount of Power As an audio system manufacturer, MISCO’s process is to work with you to determine the amount of output needed from your speakers. From there, we can work backward and figure out the minimum power supply required of the amps to attain the desired level of performance.  This process is collaborative and requires a mix of technical know-how and creativity. If you have questions about powering an audio system, we’d be happy to help you. Please [reach out to us](https://info.miscospeakers.com/contact) for answers.[![Download this free guide to help you build you loudspeaker acumen](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/14566965/c44953ae-1cbb-4c0e-a1e5-9afcd1c6c196.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/14566965/c44953ae-1cbb-4c0e-a1e5-9afcd1c6c196) Tags: [Loudspeakers](https://blog.miscospeakers.com/tag/loudspeakers), [Amps/Amplifier](https://blog.miscospeakers.com/tag/amps-amplifier) [Back to Blog](https://blog.miscospeakers.com) ## Related Articles [![The Advantages of a Bi-Amp Audio System](https://blog.miscospeakers.com/hs-fs/hubfs/dual-connection.jpg?quality=80&width=640&height=360&name=dual-connection.jpg)](https://blog.miscospeakers.com/the-advantages-of-a-bi-amp-audio-system) ### [The Advantages of a Bi-Amp Audio System](https://blog.miscospeakers.com/the-advantages-of-a-bi-amp-audio-system) If you want a quick win for improving the sound quality in an audio system, bi-amping (or... [Explore More on Loudspeaker Design](https://blog.miscospeakers.com/the-advantages-of-a-bi-amp-audio-system) [![Dual-Ported Speakers Can Go Lower and Louder](https://blog.miscospeakers.com/hs-fs/hubfs/dual-ported-speaker.jpg?quality=80&width=640&height=360&name=dual-ported-speaker.jpg)](https://blog.miscospeakers.com/dual-ported-speakers-can-go-lower-and-louder) ### [Dual-Ported Speakers Can Go Lower and Louder](https://blog.miscospeakers.com/dual-ported-speakers-can-go-lower-and-louder) You’ve probably seen a speaker enclosure with a port built into it (also called vent). The air... [Explore More on Speaker Design](https://blog.miscospeakers.com/dual-ported-speakers-can-go-lower-and-louder) [![Audio DSP Crossover Solutions](https://blog.miscospeakers.com/hs-fs/hubfs/rsz_1adobestock_250565911-min.jpg?quality=80&width=640&height=360&name=rsz_1adobestock_250565911-min.jpg)](https://blog.miscospeakers.com/audio-dsp-crossover-solutions) ### [Audio DSP Crossover Solutions](https://blog.miscospeakers.com/audio-dsp-crossover-solutions) If you are lucky enough to own a Ferrari GTO you probably put some thought into making sure it has... 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