90% people choose the wrong amplifier! Understand this article, and never be pitted by parameters.

Many people have a common problem when playing stereo: they spend a lot of money on speakers and have amplifiers at will.

Finally, it is found that the voice is weak, the bass is turbid, the sound is broken at a high volume, and the voice has no texture.

In fact, in the whole sound system, the speaker is the "voice" and the power amplifier is the "heart".

The sound source is responsible for transmitting signals, the sound box is responsible for sounding, and the power amplifier determines: dynamics, dynamics, control, resolution, and the upper limit of the whole system.

Today, with an easy-to-understand dry article, you can thoroughly understand the power amplifier, and novices can choose the right one time without stepping on the pit.

Let's distinguish first: two kinds of power amplifiers have completely different uses.
Many people make the wrong choice at the first step, and bring the music amplifier to watch movies, or the theater amplifier to listen to songs with a fever, and the effect will never come out.

① HiFi stereo amplifier (pure music amplifier)
It focuses on two-channel high fidelity, simple circuit, less interference and high signal-to-noise ratio.

Advantages: the voice is delicate, the musical instrument is transparent, and the timbre is naturally resistant to listening, which is suitable for listening to songs for a long time.

Disadvantages: no surround decoding, no support for panoramic sound, not suitable for professional cinemas.

Suitable for the crowd: the main music system is listening to songs, vocals, pop, classical, desktop and living room.

② AV theater amplifier (panoramic sound amplifier)
Multi-channel design, with HDMI, Dolby panoramic sound and DTS decoding, focusing on surround sound field.

Advantages: strong sense of orientation, full immersion, full of movies, drama and game atmosphere.

Disadvantages: multi-channel and power sharing, monophonic thrust is not as good as HiFi power amplifier at the same price, and listening to songs is slightly less delicate.

Suitable for people: home theater, audio-visual room, movies and games are preferred users.

Bottom line: Listen to songs and choose HiFi, watch movies and choose AV, and accept "balanced but not extreme" for dual use.

How to choose 02 A, AB and D power amplifiers?
All power amplifiers in the market can't escape from these three architectures, and their timbre, heat generation and efficiency are very different.

(1) A Class A Power Amplifier | Warm ceiling with fever
The whole process is conductive and amplified, with zero crossover distortion, and the timbre is warm, smooth and resistant to listening.

The voice is very emotional and the high notes are not harsh, which is Lao Shao's favorite timbre style.

Short board: huge heat, huge power consumption, small power and expensive price.

② Class AB Class A and B Power Amplifier | Home Universal Mainstream
Low volume class A work and high volume class B switch, giving consideration to sound quality and efficiency.

Full intermediate frequency, solid dynamic, extremely high stability, decades of household benchmarking architecture.

Suitable for: most living room HiFi, home main machine.

③ Class D digital power amplifier | Small and efficient new mainstream
Switching amplification, high efficiency, extremely low heating and small size.

The new high-end class D sound quality is very close to the traditional power amplifier, with low noise floor and fast dynamics.

Suitable for: users with desktop stereo, small apartment, many devices, fear of heat and pursuit of simplicity.

Avoid pits: Low-priced and miscellaneous brands of Class D are prone to high-frequency hardness and heavy digital flavor.

03 "Power Trap" that 90% novices will mistake.
The easiest thing to be fooled about buying a power amplifier is the wattage.

Be sure to distinguish between two parameters:
Peak power PMPO: instantaneous explosive power, no reference, pure gimmick.

Rated RMS power: continuous and stable, undistorted output, the only effective parameter.

Golden formula for matching power amplifier and speaker (remember it correctly)
Rated power of power amplifier = 1.2 ~ 1.5 times of speaker power.

Many people worry: the amplifier is too big to burn the horn?

The truth is quite the opposite:

Low-power power amplifier with full volume is the culprit of horn burning!

Insufficient thrust will produce "clipping distortion", and high-frequency harmonics will go straight to the tweeter, which will easily burn the horn.

The power reserve is sufficient, the waveform is clean and dynamic, but it protects the speaker.

Three key parameters, understanding is half an expert.
1. Damping coefficient | determines whether the bass is dry or not.
Simple understanding: the "braking ability" of the amplifier to the speaker.

The higher the value, the faster and cleaner the bass will be, and it will not be sloppy.

Household suggestion: ≥50, bass texture directly opens the gap.

2. SNR | determines whether the background is black or not.
The higher the value, the smaller the noise floor, the cleaner the background and the more details.

Household qualification standard: above 90dB.

3, impedance matching | Never mess around
Common speakers: 4Ω, 6Ω and 8Ω.

The load supported by the power amplifier must be strictly matched, and the small impedance speaker with incompatible power amplifier will overheat, protect and even damage the equipment.

05 Eight Pit Avoidance Guides for Beginners (Super Practical)
Myth 1: The greater the wattage, the better the sound quality.

Power only represents thrust, not tuning, details and analysis. Bad high power will only be noisy, chaotic and hard.

Myth 2: The power amplifier can be plugged into a closed cabinet.

Power amplifier is most afraid of heat! Long-term high temperature in confined space, rapid aging, easy to protect and crash.

Myth 3: Turn on the phone and pull the volume directly.

Turn on and off the machine and cut the sound source to zero volume first to prevent the impact current from penetrating the horn.

Myth # 4: It doesn't matter if you just wire.

Inferior lines will introduce noise floor and loss dynamics, so long lines must be well used.

Myth 5: AV amplifier can also listen to songs with high HiFi.

The same price must not be as good as the pure HiFi power amplifier, and the power sharing of the channel is a serious injury.

Myth 6: Class D equals poor sound quality.

High-end class D has already been attacked, clean, transparent and dynamic, which is very suitable for modern home.

Myth 7: The power is just equal to the speaker.

No margin, dynamic compression, large volume will be distorted.

Myth 8: Just look at the parameters and not the style.

Some power amplifiers are warm, some are cold and some are analytical. Style matching is more important than parameters.

06 scene quick purchase scheme
Listening to music near the desktop (study/computer)

Small class D combined power amplifier, low power and high fidelity, clean, no fever, enough to listen.

Listening to music in the living room (20–35 ㎡)

Class AB two-channel HiFi power amplifier, with sufficient thrust, stable timbre and the highest hearing tolerance.

Home cinema audio-visual room

High-end AV amplifier, priority HDMI version, panoramic sound decoding, multi-channel thrust equalization.

Advanced fever

Front and rear split structure, tuning and thrust can be upgraded independently, and the upper limit is higher.

Audio is never "the more expensive the better", but the more matched the better.

The speaker is responsible for the upper limit, and the amplifier is responsible for releasing the strength.

Choose the right amplifier, and the sound quality of your whole set of audio will be directly upgraded to a higher level.

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