Best 8 Variable Gain Amplifiers in 2026

Power - 1100 Max x 1 @ 2 Ohms, 550 Max x 1 @ 4 Ohms

Class A/B Topology - Class ‘A’ amplifiers have enormous amount of current flowing through its output transistors with no audio signal. Class ‘B’ amplifiers have no current flowing through its outputs with no audio signal

Mosfet Power Supply - A MOSFET is an electrical switch that allows the flow of electrical current. It controls the output voltage & current precisely by removing the output current sensing loss & eliminating all secondary feedback circuitry

500-Watt MOSFET 4-Channel Class A/B Power Car Amplifier

RMS Power at 2 Ohms: 125 Watts x 4 Channels

RMS Power at 4 Ohms: 75 Watts x 4 Channel

The R2-500X1 full-range class-D mono amplifier (1.9" x 6.8" x 8.5") is packed with features and performance to deliver power and bass on demand with 500 Watts of RMS power

Class D technology makes this amp extremely efficient by reducing demand on the vehicles electrical system (RMS Power: 300 Watts x 1 @ 4Ω OR 500 Watts x 1 @ 2Ω)

Featuring C.L.E.A.N. circuitry to help you adjust your gain settings, a P.O.W.E.R. Supply that generates more power as voltage increases, and integrated Punch EQ that corrects for acoustic deficiencies while delivering up to 3X the bass

Power - 1000 Watts Max x 2 @2-Ohms, 500 Watts Max x 2 @4-Ohms, 2000 Watts Max x 1 Bridged @4 Ohms

Class A/B Topology - Class ‘A’ amplifiers have enormous amount of current flowing through its output transistors with no audio signal. Class ‘B’ amplifiers have no current flowing through its outputs with no audio signal

Full Range - With a Full Range amplifier you not only have the option to run your speakers, but also your subwoofers

Stereo/Parallel/Bridge-Mono Mode

User Selectable Input Sensitivity - 0.775V And 1.4V

Electronically Balanced Rca & Xlr Inputs; Binding Post And Speak On Outputs

1400 WATT POWER: The Pyle Dual Channel Car Amplifier is perfect for your vehicle's sound system. Gives you up to 1400W bridgeable output. Features switchable bass boost, variable gain control, configurable electronic crossover network

GOLD-PLATED RCA PORTS: The RCA ports are gold-plated for eliminating signal loss. A subsonic filter allows low-end interference to be cut so your speakers will always deliver the highest quality audio. Features switchable bass boost, low level inputs

MOSFET PULSE: The MOSFET pulse width modulation power supply allows for a clean, distortion-free signal to your compact speakers providing you with crisp and clear audio for an outstanding music experience. Also features anti-thump turn on

550 W MAX Power @ 2 Ohm x 2 Channels

250 W MAX Power @ 4 Ohm x 2 Channels

1000 W MAX Bridged Power @ 4 Ohm x 1 Channels

Full-range

Class-D amplifier

4 channels of 110 watts RMS @ 2 Ohms

COMPACT DESIGN: Digital class D Brazilian technology allows this amplifier to have a small footprint by integrating a high-speed mosfet power supply with top of line transistors to ensure performance in a small heat sink without compromising performance. Dimensions: 3.93″ depth x 5.02″ width x 2″ height

POWER: This amplifier is designed to run your stereo system with the power it needs to perform! 500 Watts maximum dynamic RMS power output of 4x 125 Watts at 2 Ohms per channel. Its high efficiency rate of 87% provides more power with less battery consumption.

BRIDGEABLE: Double the power output to your speakers by bridging two channels. Minimum impedance of 4 Ohms per bridged channel at output power of 2 x 225 Watts RMS

4 CHANNEL BRIDGEABLE AMPLIFIER: Pyle’s PLMRA420 is engineered as a 4 Channel bridgeable marine amplifier that powers up your speaker and is universally compatible. It also has high and low electronic crossover network or pass filters

PREMIUM RCA INPUT: For an easier use of this hydra marine amplifier, it comes with premium RCA inputs. If your marine receiver lacks RCA output jacks, you can connect speaker output leads to the high level inputs

SHORT PROTECTION: Built with a heavy duty Aluminum Alloy heatsink, thermal overload speaker short protection and LED light indicator. These are to protect the amp and your vehicle's electrical system from short circuit conditions

Product Name : Audio Amplifier Module;Chip : LM386

PCB Board Size : 41 x 14mm(L*W);Material : Electric Part

Onboard LM386 Chip.With 200 multiplier benefits circuit design

A MUST HAVE | The UR 1 Gain Amplifier Subwoofer Volume Knob allows you to control your Subwoofer output channel from the driver's chair for when you need that quick adjustments without fussing with your Graphic Equalizer or Stereo Volume Controls!

RATED FIVE STARS | The UR 1 is a great control knob to have and a nice addition to your sound system. With its good build quality, the control knob is very precise, giving you unparalleled level of control on adjusting the bass for different types of music.

EASY SETUP | Works great, and it is very easy to mount on your car's console with no hardware to buy. Great for multi-sub setups in cars. Adjust the volume on the fly, and crank it up!

1000 WATT POWER: The Pyle Dual Channel Car Amplifier is perfect for your vehicle's sound system. Gives you up to 1000W bridgeable output. Features variable subwoofer crossover, variable gain control and high level low impedance MOLEX input connector

SILVER-PLATED RCA PORTS: The RCA ports are silver-plated for eliminating signal loss. The subsonic filter allows low-end interference to be cut so your speakers will always deliver the highest quality audio

DISTORTION-FREE: The MOSFET pulse width modulation power supply allows for a clean distortion-free signal to your compact speakers providing you w/ crisp and clear audio for an outstanding music experience

0.1-2000MHz RF Wide Band Amplifier

Power supply voltage: 9-12 VDC

High Gain Low Noise LNA Amplifier

Mutiple input/output interfaces: with 3.5mm AUX/stereo RCA/5-DIN inputs and stereo RCA/5-DIN outputs, can be compatible with most low-volume audio sources such as ipod, ipad, phone, TV, MP3 player, potable CD player, computer, video game etc., and boost their output to the level needed to drive amplifier or speakers.

With built-in amplification and voltage boost circuit: adjustable gain to match better with different audio sources, support DC 5-24V wide input voltage that can share the power supply of amplifiers, while L1 can always work at a high voltage of 26V to provide ±12.5V high output amplitude and max 20dB high gain.

Unique design and HiFi clear sound: double-side PCB design, NE5532P op amp with pluggable socket design, convenient to change other op amps to enjoy different sound and bring much DIY fun for audiophiles. High-qaulity sealed potentiometer, with wide frequency bandwidth and excellent dynamic response, the sound is smooth and natural, warm and delicate with ultra-low distortion.

1600 WATT POWER: The Pyle 4 Channel Car Amplifier is perfect for your vehicle's sound system. Gives you up to 1600W bridgeable output. Features switchable bass boost, variable gain control, configurable electronic crossover network

SILVER-PLATED RCA PORTS: The RCA ports are silver-plated for eliminating signal loss. The subsonic filter allows low-end interference to be cut so your speakers will always deliver the highest quality audio

DISTORTION-FREE: The MOSFET pulse width modulation power supply allows for a clean distortion-free signal to your compact speakers providing you w/ crisp and clear audio for an outstanding music experience. Also features pulse width modulation system

6 CHANNEL BRIDGEABLE AMPLIFIER: Pyle’s PLMRA620 is engineered as a 6 Channel bridgeable marine amplifier that powers up your speaker and is universally compatible. It has a bridge mode selection switch and high or low electronic crossover network

WATERPROOF & WEATHERPROOF: The audio amplifier is waterproof with its marine grade rating of IP-01. It’s constructed with gold-plated stereo speaker output terminal connectors to combat weather corrosion with long-term us

SHORT PROTECTION: Built with a heavy duty Aluminum Alloy heatsink, thermal overload speaker short protection and LED light indicator. These are to protect the amp and your vehicle's electrical system from short circuit conditions

COMPACT DESIGN: Digital class D Brazilian technology allows this amplifier to have a small footprint by integrating a high-speed mosfet power supply with top of line transistors to ensure performance in a small heat sink without compromising performance. Dimensions: 8.11″ depth x 8.11″ width x 2.60″ height

POWER: This amplifier is designed to run your stereo system with the power it needs to perform! 1200 Watts maximum dynamic RMS power output of 4x 300 Watts at 2 Ohms per channel. Its high efficiency rate of 84% provides more power with less battery consumption.

BRIDGEABLE: Double the power output to your speakers by bridging two channels. Minimum impedance of 4 Ohms per bridged channel at output power of 2 x 520 Watts RMS

Material: Electric Parts

Model: LM386

200 multiplier benefits circuit design

Class-D Mono-block Subwoofer Amplifier, 1200 Watts Max Power, RMS 600 Watts x 1@2Ohm; RMS 350 Watts x 1@4Ohm.

Featuring a high-speed MOSFET power supply, premium grade internal components, as well as 4-way protection circuitry, the amplifier will safely operate at the highest levels of performance for hours on end. Highly efficient heatsinks keep the amplifier cool with a sophisticated new look.

Recoil mono amplifiers come with bass remote control. Use it to customize your bass on the fly with just a turn of a knob.

voltage: 9-12 VDC

Maximum power output+13dBm 20mW

HIGH PERFORMANCE - DS18’s SXE series of amps was designed for users looking for an extreme increase to the quality of music reproduced by their vehicle. The SXE-4000.4D guarantees your sound system’s speakers perform at their peaks on every use

VARIABLE CROSSOVER - The SXE series of amplifier gives users the ability to tailor the audio reproduced by their vehicle to their personal listening preferences through the use of it’s fully variable crossover, adjustable gain input sensitivity, and multi-channel amplifier design: everything you need to take control of your listening experience

PERFECT SIZE - As a Class D amplifier, the SXE series uses power transformers significantly smaller than your average amplifier, making it the perfect size for any vehicle’s custom build: but, what it lacks in size it makes up for in power

1-Ohm Minimum Impedance Monoblock Operation | Multi-color RGB LED Illumination Accent Lighting | Solid Color, Flashing, Random, or Slow-Motion Color Change | MOSFET Power Supply with Audiophile Grade IR Transisitors

Direct Short, Thermal and Overload Circuits Protect Amplifier | 200mV-6V Low Level RCA Input and Pre-Amp Output | Variable 12dB Low Pass and Subsonic Crossovers | 12dB Bass Boost Increases Low Octave Harmonics

DataLink for Strapping Two Amps for Double Power | Dash Mount Gain Control Module Included | RMS Power Rating: 800W x 1 at 4-Ohm | 1,400W x 1 at 2-Ohm | 2,500W x 1 at 1-Ohm | 3,000W x 1 at .5-Ohm | 6,000W Max Power

Name: AD603 Voltage Controllable Gain VCA Module Size: 50mm X 39mm Supply voltage range: ±5v

This amplifier module is a voltage controllable gain amplifier. It is composed of two AD603 cascade amplifiers. It can amplify the signal voltage amplitude well. The gain can be adjusted up to 80dB.

The AD603 is a low noise, voltage controlled amplifier for radio frequency (RF) and intermediate frequency (IF) automatic gain control (AGC) systems.

New for 2017!

Gain Control With "Optimal Input" Indicator

FIT2 (Fail-Safe Integration Technology) Circuitry

1000W Max Class AB @ 2 Ohm, Stable at 2 Ohm and 4 Ohm with Bass Knob Included

S/N Ratio > 70 dB with and Input Sensitivity at 200mV-6V with Input IMP at 22k Ohms

HPF at 80 Hz ~ 1.2 kHz with LPF at 50 Hz ~ 250 Hz and Frequency Response at 10 Hz ~ 30 kHz

This audio amplifier module is a mono audio amplifier based on the LM386 chip,which is useful for DIY many HAM radio experiments.It is a very cost effective method of small signal amplification.Very convenient instead of using separate components.Handy!

Great small low frequency audio power amplifier to be used for driving small speakers or to build an RC sound module with an arduino. It could be hooked up to headphones directly too

This tiny Op Amp module is good and delivers clear crisp sound.Easy to adjust volume with variable resistor.A convenient screw terminal allows the user to connect a suitable loudspeaker without any soldering.It works with RC truck sound system or an RC boat project

Onboard LM358 Chip .

100 gain of the circuit design.

Onboard10K adjustable resistance, you can adjust the magnification.

Power Handling: 1200W @ 1-Ohm, 1000W @ 2-Ohm, 650W @ 4-Ohm; includes power and protection LED

Remote sub level; bridgeable in/out that allows you to link two amplifiers together

Gain control with 0-12db bass Boost

Onboard chip LM386 Audio Amplifier Module. A circuit design with the advantages of a 20 multiplier. Chip: LM386 power amplifier for Arduino EK1236. PCB Board Size: 1.61 x 0.55inch(L*W), Material: Electric Part.

Car speaker wire clamp. Few peripheral devices; Low distortion; This plate is 200 times the default gain; Onboard horn socket;

Vehicle-mounted 10K variable resistance, adjustable volume. Components and total are widely used tape recorders and radios being.