9 best desktop speaker amp

Product description

Parameters:

Audio input: Bluetooth 5.0 / 3.5mm AUX

Audio output: raw cable speaker jacks

Number of channel: 2.0

Work Voltage: DC 5V-27V, >2A (recommended)

Bluetooth distance: 15 meter (Without obstacles)

Matched speaker: 4-8Ω, 50W~300W

Max output power: 100W*2

Dimensions with case (L*W*H): 84*52*24mm / 3.31*2.05*0.94in

Net weight: 100g / 0.22lb

Package weight: 200g / 0.44lb



Packing List:

1*Amplifier Board

2*Acrylic shell

1*Volume Konb

1*5.5/2.1mm Power Cable

4*Copper column

8*Screw

1*Screw Driver

1*Steel Nuts

1*Manual



Warm tips:

1. Before use please read user manual and description.

2. Please tear off the protective film on the acrylic board.

3. Please use sufficient power adapter according to the size and rated power of your speakers.

4. Please keep amp board as far away as possible from the router or other electronic device and don' t use too long wires to avoid signal interference.

5. Recommended DC 8~24V, 2A or above power adapter.

6. Recommended to use a speaker above 50W to avoid speaker damage.

7. If you put the amp board into metal case, please pull out Bluetooth antenna.

• With Bluetooth 5.0 and 3.5mm AUX audio input, achieving more stable and faster transmission. Compatible with most common audio device such as iPod, Phone, MP3, computer, TV, CD players, or Streaming Media players and so on.
• Adopting 2PCS classical TPA3116D2 chip with AM interference suppression function, max output power can reach 100W*2, easily to drive most home desktop/bookshelf/floor-standing speakers.
• Adding filter and red ring inductance, the sound is clear, sweet, mellow and full, no pop sound when skipping or pausing songs, and no audible noise even at high power output.
• Mini size and higher playability, easy to assemble and install. With protective case, reverse connection / over-voltage / under-voltage and over-heat / short-circuit protection. Its wide working voltage DC 5-27V make it easy to used at home or in the car.
• Very easy and convenient to use. We include the tool you may need to install it. This board only adopts short prompt tone instead of annoying voice prompt.

Product description

Aimpire Audio Amplifier Only Designed for Hi-Fi Sounds



Enjoy Transparent Natural Warm Music Anytime.



Mini Compact Design with Practical Powerful Function, Our Small Mini Integrated Home Amplifier Exclusively Designed for the People who Pursue HiFi Sound.



Just Plug and Enjoy Music

Portable design perfect for your desktop or a smaller space in your home or office, digital amplifier is easy to connect to your audio system, just plug and play, no any driver needed.



Bluetooth 5.0 Mini Audio Amplifier Parameter

Power Supply: DC24V, 5A

Output Power: 100W x 2 RMS

Total Harmonic Distortion (THD+N): ≤ 0.04%

Frequency Range: 20Hz - 20KHz (±1 dB)

SNR: ≥ 98dB

Input Sensitivity: ≤ 280mV

Bluetooth Transmission Distance: 33ft/10M

Terminating Impedance: 2 Ohm - 8 Ohm (Ω)

Audio Input: Bluetooth / RCA

Audio Output: RCA (connected to DAC Decoder, Pre-amplifier, Passive speaker)

Material: Aluminum Alloy shell

Size: 110 x 90 x 38mm (without the bluetooth antenna height)

Weight: 0.6kg



Warm Tips

1.Support both Bluetooth input and RCA input, but prior use Bluetooth input. You need to turn off the Bluetooth from your device if you use RCA input when Bluetooth pairing.

2.To avoid sparks, please connect power supply with the device before plug it into socket;

3.For passive speakers, not the powered speakers.

4.Dolby signal input is not supported.

5.Please do not use in car as the power in car is not stable.



Package Including

1 x Bluetooth 5.0 Amplifier

1 x Power Supply Adapter 24V-3A

1 x Bluetooth Antenna

1 x Manual

• [Classic TPA3116 Amp Chip and PCM5102 Bluetooth Chip] The Mini Bluetooth Amp adopt Texas Instruments TPA3116D2 chips and PCM5102 bluetooth decoding chip. Enjoy the music more delicate and transparent to nature, warm, clear.
• [Desktop Speaker Amplifier Designed for HiFi Sounds] No sparks and no audible noise, Aluminum Alloy shell to keep the purity of the sound, 2 channel Hi-Fi stereo audio circuit exclusively designed for Audiophile.
• [QCC3003 Bluetooth 5.0 Technology] Qualcomm QCC3003 Bluetooth chip, wireless streaming range up to 33ft connection. No pop no audible noise when bluetooth connecting. Built-in speaker protection circuit and low pass bass filter.
• [Bass & Treble Control Mini Amp] Volume, Treble and Bass control knobs for more delicate adjustment of the sound, much fun and high playability, best choice for either beginner or audiophile. Perfect for home Theater speakers, or any Hi-Fi streaming media.
• [2 Channel Amplifier Plug and Play] 0.04% THD, 100W x 2 with 24V power supply, can drive 4ohm - 8ohm speakers. Digital Amplifier is easy to connect your audio system with no driver to install or any settings. Free technical support, 18-month manufacturer's warranty.

User questions & answers

Question:	Can it work with my iphone via bluetooth
Answer:	The net weight of the whole brush set is about 136 grams. The handle of these rose makeup brushes are all made of high quality alloy with gold/rose gold plated, and the texture is very good. Buy one and experience it and it will not disappoint you.
Question:	Can I connect to bluetooth headphones
Answer:	I personally haven't had this issue. I normally use a small amount of isopropyl alcohol on a cotton pad and wipe them once every one to two weeks. I normally wash my hands before I do anything makeup related to minimize how many times I have to clean the handles of my expensive/nice brushes to prevent potential fading.
Question:	How do I connect this to my tv
Answer:	It would work well for blush and bronzer/contour
Question:	Does it come with the power supply
Answer:	Yes they are very soft and feel and look like professional brushes.

Product features

Aimpire Audio Amplifier Only Designed for Hi-Fi Sounds

Bluetooth 5.0 Mini Audio Amplifier Parameter

Power Supply: DC24V, 5A

Output Power: 100W x 2 RMS

Total Harmonic Distortion (THD+N): ≤ 0.04%

Frequency Range: 20Hz - 20KHz (±1 dB)

SNR: ≥ 98dB

Input Sensitivity: ≤ 280mV

Bluetooth Transmission Distance: 33ft

Terminating Impedance: 2 Ohm-8 Ohm (Ω)

Audio Input: Bluetooth /RCA

Audio Output: Speaker Out

Just Plug and Enjoy Music

Portable design perfect for your desktop or a smaller space in your home or office, digital amplifier is easy to connect to your audio system, just plug and play, no any driver needed.

Warm Tips

1.Support both Bluetooth input and RCA input, but prior use Bluetooth input. You need to turn off the Bluetooth from your device if you use RCA input when Bluetooth pairing.

2.To avoid sparks, please connect power supply with the device before plug it into socket;

3.For passive speakers, not the powered speakers.

4.Dolby signal input is not supported.

5.Please do not use in car as the power in car is not stable.

Package Including

1 x Bluetooth 5.0 Amplifier

1 x Power Supply Adapter (24V,5A)

1 x Bluetooth Antenna

• ♬ HIGH RESOLUTION POWER AMPLIFIER: SMSL SA100 use the Texas Instruments's power amplifier digital amplifier chip TPA3116. High current 19V adapter adapts to the dynamic response of audio.
• ♬ BLUETOOTH STEREO AMPLIFIER: The new Bluetooth 5.0 technology with low power consumption and high sound quality. Output 50W X 50W.
• ♬ TREBLE & BASS ADJUSTMENT: With tone adjustment, the BASS and TREBLE can be adjusted separately.
• ♬ HIGH QUALITY SOUND: Electronic volume control, without the potential noise of traditional resistor volume control noise when adjusting the volume.
• ♬ SIMPLE DESIGN & SMALL SIZE: Home small hi-fi integrated amplifier; Simple compact design; Sturdy; Lightweight makes it perfect for projects and DIY. 24-Hours service, any question, please contact seller directly.

User questions & answers

Question:	How would i use this with the smsl sp100 and sanskrit 10th mkii
Answer:	Come with cuby fish.
Question:	Does this amp needs a dac
Answer:	Pretty long just like in the pic
Question:	Does 14 gauge cable fit or do I need banana plugs
Answer:	I think China
Question:	Any sparking when connection the main 120 Volt power outlet or when connecting the power supply to the amplifier
Answer:	I talked to Amazon's chat support and they said that in order to qualify for the free shipping with this seller, you had to spend at least $50 on their products.

Product features

SMSL SA 100 desktop Small Amplifier, with TPA3116 Chip, Support Bluetooth 5.0 ,50w X2 Power Audio Amplifier

• SMSL SA 100 is desktop amplifier, adopt power amplifier chip TPA3116D2, output Power:50W x 2(4Ω)，driving speakers up to 50-80W/2Ω in mono.
• SMSL SA100 Bluetooth amplifier support 5.0 , the amplifier can be easily connected to your phones,and other portable devices with Bluetooth.use Phone, MP3 players, Echo Dot etc., as input.
• SMSL SA100 BASS and TREBLE can be adjusted seperately. Adjust the volume knob gently to achieve a accurate volume value. SA100 portable amplifier perform better with other HIFI devices, DAC----Amp----Speaker. SMSL M100 Dac is recommended.(ASIN:B07KLJRKS7)
• Tips: This product is designed to be desktop and exquisite, please turn the volume Knob gently, or the volume value may skip.

Class-D Stereo Amplifiers

TPA3166D2 Class-D Stereo Amplifiers are stereo efficient, digital amplifier power stage devices for driving speakers up to 100W/2Ω in mono. TPA3116D2 does 2x50W/4Ω with a small heat-sink attached to its top side PowerPad. TPA31162D2, output distortion less than 0. 1%

Bluetooth 5.0 Amplifier

Support Bluetooth 5.0 input, and come with Bluetooth antenna.

• 1)Hold to switch power ON/OFF.
• 2)Press to switch INPUTS between "AUX,Bluetooth" which display as "RUN,bt".
• 3)When in bluetooth inputs, It is forced to enter the pairing state.
• 4)Turn on the phone Bluetooth, choose pairing to SMSL SA100 device.

Bass & treble volume control

SMSL SA100 is designed with accurate volume control and easy-to-read display, BASS and TREBLE can be adjusted seperately.

• 1）Short Press power button to switch betwwen high and low adjustment options.
• 2)The Bass and treble range is is -7--+7, and each number represents the gain of 2dB.
• 3)Gently turn the knob right or left to adjust volume and achieve the accurate volume value.

2x50W/4Ω output power

Can drive outdoor/ desktop /bookshelf /floor standing speakers from 25w~50w, can use with iPod, Phone, MP3 players, TV, Echo Dot, CD players, pc,or Streaming Media players as input.

Product description

Additional Notes:

Please plug the power cord into the amp THEN the wall.

Parameter:

1. Power supply voltage range: 15v-24v;

2. Power supply RMS range: 90w - 120w;

3. THD: ≤ 0.5%;

4. Frequency Range: 20Hz - 20kHz (±1 dB);

5. SNR: ≥ 98dB;

6. Input sensitivity: ≤ 280mV;

7. Terminating impedance: 2Ohm - 8Ohm;

8. RMS Output power: 100W + 100W;

9. Input mode: Analog;

10. Supplied Accessories: Amplifier, Power supply, Manual.

• Perfectly suited for your desktop or a smaller space in your home or office, digital amplifier is easy to connect to your audio system with no software to install or settings to change;
• 100W MAX Power Output X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with 24V power supply, can drive 200watts(8 ohm), 300watts(4 ohm) speakers;
• Simple compact design but practical and powerful; No pop, no audible noise, dead silent when nothing is playing through it;
• Home small hi-fi integrated amplifier, Sturdy, Lightweight, Aluminum enclosed amp makes it perfect for projects and DIY;

Product features

2.0 Channel Simple Powerful Stereo Amplifier

• Power Adapter: 24V/4.5A
• DC Input Range: 12-24V
• Terminating Impedance: 2 Ohm - 8 Ohm
• MAX Power Output: 100W x 2
• THD ≤ 0.04%
• Frequency Range: 20Hz - 20kHz (±1 dB)
• SNR ≥ 98dB
• Input Sensitivity ≤ 280mV
• Input Mode: RCA

Extraordinary Clarity Hi-Fi Sound

Enjoy Hi-Fi music with next-generation stereo amp for unrivaled sound quality. Improved channel balance, lower noise floor, and overall A purer sound. Reduced distortion and increased dynamic range. Clean and potent power output.

Advanced Audio Architecture

The High-Performance Texas Instruments TPA3116D2 Chip presents music with rousing highs and deep lows. Even at high volumes, there’s less than 0.04% harmonic distortion resulting in remarkable clarity.

Irresistible Finish

Fosi Audio TB10A curved edges and sleek controls accentuate its unibody design. With truly useful features, and thoughtfully designed premium enclosures. A new generation: exquisite design, improved operation.

Drive passive speakers

Perfect if you prefer separate passive speakers and preamps for your audio setup. 100 watt per channel power output can drive most home passive speakers to create astonishing Sound. Easy to fit your audio system with RCA input,

Upgraded DC Outlet

The old version or other brand amplifiers sparks flying when power supply plugin, it's unsafe. With a built-in power protection circuit, there are no sparks flying when you plug the power adapter into the amplifier. Safe for use!

24V/4.5A Power Supply

Unlike other amplifiers come with a cheap 12V power supply. Fosi Audio TB10A equip with the energy-efficient and stable power supply which got authoritative certification by many security tests, can get an astonishing sound.

• Easy to set up, no special software, app, or driver to install, a true plug-and-play digital audio adapter
• With USB, optical and coaxial S/PDIF inputs can fit with most home audio system, and RCA output can be connected to amplifier or powered speakers on your desktop; Built-in Hi-Fi headphone amp chip can drive most 16ohm to 200ohm headphones
• 160mW RMS(32 ohms, 20 Hz - 20 KHz, 0.01% THD), with bass and treble control can be used as preamp or volume controller for your PC/MAC/Computer
• Mini Compact D/A converter, stream bit-perfect 24bit/192KHz HD with low jitter, with output protect circuit, safe for your expensive audio system
• Come with 5V USB power supply cable, optical cable, USB type B cable and 18-month warranty; Full metallic shell to ensure high quality

Product features

Product description:

PC-USB supports input sampling rate: 96K/24Bit

High and low sound adjustment range: ±6dB

Fiber/coaxial support input sampling rate: 192K/24Bit

Frequency response: 20Hz-20kHz (±3dB)

PC-USB support operating system: XP/W7/W8/W10/MAC/linux

Distortion: 0.01%; SNR: ≥105dB

Amp output maximum power: 100mW 32Ω load

Headphone matching impedance: 16-200Ω

Working voltage: DC5V; RCA output level: 2.3V

Size (L*W*H): 73.5*98*33MM (without knobs and terminals)

• High power high fidelity Class-D power amplifier chip TPA3116.
• Master design,integrated into minimalist design style;Specially designed power supply,superb dynamic response!
• High quality gold-plated input and output jacks.Minimalism design,keep compact under guaranteeing performance.
• Full aluminum CNC milling shell,very fine workmanship.
• Humanized operation and switch memory function.

User questions & answers

Question:	Dose this unit support eu voltage
Answer:	Wire Method: "+" (beside two black cables) means the two black cable connected to the positive pole. "-" connected to the negative pole. The black cable of the blower is connected to the negative pole, and the red cable is connected to the positive pole. When you strip the two wires of the cigarette lighter, you will see the difference between positive and negative poles. Red (positive) connecs to red Black (negative) connects to black
Question:	Is this worth buying to push my 2 KB6000B kickers
Answer:	Hello, mine did not come shattered. My daughter loves the colors. It’s up to you to try again.
Question:	I notice in some pictures the black version has a cheaper looking generic volume knob. Which knob will mine come with
Answer:	Thanks for your purchase. Sorry to say we do not sell these as individual units, only as a palette.
Question:	Sorry, but how can 120W (60+60) be produced if only 40W is consumed
Answer:	Warm natural and smoke show are the same. Lovely colors.

• ❶ Adopt The Instruments TPA3255D2 chip, NE5532 op-amp. Very Quiet, Runs Extremely Cool,Easy to set up
• ❷ 300W+300W HiFi integrated class D amplifier, Exclusively designed for the customers who pursue HiFi sound,High efficient power output up to 300 Watt
• ❸ Two input ways:3.5mm AUX Audio input/ RCA Audio input
• ❹ Simple compact design,And the exterior design is delicate and beautiful little amp,It can match with your computer/ desktop /Home theatre system and so on
• ❺ Package with a DC 32V 5A Power Adapter for free,but you can purchase a DC 48V 5~12A power supply to achieve the best performance(Cannot use linear power supply).Please read carefully before buying and use it properly. If you need technical help, please contact the seller for support: www.amazon.com/hz/help/contact/A3BG62S1F23IH5#

User questions & answers

Question:	Does this ship with the LM4562 op chip
Answer:	No idea, search paring for a new remote or email the manufacture.
Question:	Is there a tun on/off pop or noise
Answer:	Yes, if you do not choose the voice model, it will play a clear sound, also there are 4 Types of EQ: FLAT; POP; ROCK; CLASSIC , Thank you.
Question:	Can this power amp be used for home subwoofers
Answer:	If you have connected your phone with projector via chrome cast, we think you should connect this soundbar with your projector via AUX or RCA cables, and Pls switch the soundbar play mode into RCA Mode (Green light) or AUX Mode (White Mode), Thank you, and you can feel free to contact us at "[email protected]" if you would have any questions.
Question:	Is the power supply included
Answer:	That's exactly what happened to me! I had to go and buy an "Audio 3.5mm Aux Cable" plugged it into the audio in from the sound bar and the headphones spot on the TV. Make sure the volume is low! Use the mode button on the remote until the light on the sound bar is white! Good luck!
Question:	is this Stereo to Mono cable
Answer:	Yes, and bring the cable as well!
Question:	If using an external amp with an avr, would this cable work for the 2 outputs on the avr to 1 input on the external amp
Answer:	Yes, As long as your TV has a working RCA, USB, Optical or AUX audio output, it should work just fine with the soundbar.
Question:	Where does the cable split from one cable to two? Is it near the single-male end or near the dual male end
Answer:	Probably three feet.
Question:	What's the length of this cable before the Y, and the length of each after the split
Answer:	Dear Consumer Yes，The remote control has batteries.

Product features

HiFi integrated class D amplifier

300W+300W Dual Channel audio amplifier ,Mini Power Amp, More powerful, Sound great

Build quality is surprisingly solid,Nice touch

The dual 300W shocking bass output is compatible with passive stereo speakers of most sizes and impedance specifications

Two input ways:3.5mm AUX Audio input/ RCA Audio input

Use TPA3255 Chip, digital audio amplifier BTL bridge power output 300W x 2 channel design, THD less than 0.008% when working continuously

Please pay attention!

Q: Why the amplifier distortion when raising volume ?

A: Under normal circumstances, distortion is caused by the mismatch between the power of the amplifier and the speaker. Therefore, it can be reasonably matched according to the ratio of 1.2-1.5 to 1 between the power amplifier and the speaker

Q: How to match the amplifier and speakers reasonably?

A: The best match is 1.2-1.5:1 (that is, the speaker power is 50W, then the power amplifier power is 60W-75W)

Q: The power amplifier is connected correctly, why is there noise such as electric current?

A: please check whether there is current sound when no load, and whether there is no current sound when no load, please replace the audio input wire and input device. If there is current noise at no load, you can replace the power supply to test again

At the same time, confirm that the surrounding current signals will not cause interference to the equipment

More technical support and help,pls ask me:www.amazon.com/hz/help/contact/A3BG62S1F23IH5# .Or leave any of your instant messaging account and I'll contact you!

• 【Big Power Output, with SUB Port】This amplifier’s max output power can reach 160W X 160W with high-quality 32V/5A power supply , the package include24v power supply. it also can support SUB Output when it connects with active subwoofer.
• 【Bluetooth Audio Amplifier Widely Use】This Home Amplifier has RCA and USB port, also support bluetooth 5.0 transmit. so compitable with many device such as: MP3, CD, TV, PC, Echo Dot, iPhone, Android Smartphones, iPad, iPod, Tablets, Turntable, etc. (USB Port is only used U-disk input)
• 【Home Amplifier Easy to Use】 Perfectly suited for Bookshelf/ Computer/ Desktop/ Theater audio system or other external passvie speakers in your home or office. and this home stereo amplifier is easy to connect to your audio system with no software to install or settings to change
• 【2 Channel Amplifier High Quality】 Adopt TDA7498E chip to get clear and clarity sound. No Pop, no audible noise or dead silent when nothing is playing through it. Advanced short circuit protection, ssimple compact design, Aluminum shell and knob,Filter more noise

Product features

Main Feasure

• 1. Big Power: max output power can reach 160W X 160W with high-quality 32V/5A power supply
• 2. has RCA and USB port, also support bluetooth 5.0 transmit. so compitable with many device
• 3. it also can support SUB Output when it connects with active subwoofer
• 4. Perfectly suited for Bookshelf/ Computer/ Desktop/ Theater audio system or other external passvie speakers in your home or office.
• 5. Adopt TDA7498E chip to get clear and clarity sound. No Pop, no audible noise or dead silent

Support U-Disk Input, Fast Speed

Support SUB Output, Need Connect Active Subwoofer

Support Bluetooth, Stable Connection Up to 32FT

Specifications

Maxpower output: 160W*2 4Ω load,(32v power adapter)

THD: 1W 0.05%

Speaker matching impedance: 4-8Ω

SNR: ≥98Db

Working voltage: 19-35V

Bare metal size: L 4.6*W 4.6*H 1.3 in

Input sensitivity: 0.775V

Frequency response: 20Hz-20kHz(±3dB)

Package Dimension: L 9.44in*W 8.26in*H 2.36in

Support music format MP3:WMA,APE,FLAC,WAV

Safe Use, Good Quality

1.Class D grade audio amplifier to ensure its excellent sound quality

2.Software turn on/off, better using experience

3.overheat protection design, more safety

4.Bigger heat sink design, faster heat emission

Operation Steps

1.Make sure the VOL button to the minimum.

2.Connect the speakers according to the rear panel interface, pay attention to distinguish between positive and negative.

3.Connect the sound source that needs to be used(Optional RCA/Bluetooth, U disk）

4.If the current playback state, inserting a U-disk will automatically jump to the U-disk mode.

5.Connect to power.

6.Press the power switch.

package include

Amplifier *1

24V Power Adapter *1

Power cable *1

User Manual *1

note: if you need to use a 160w output, pls buy extra 32V power adapter

Product description

Warm tips: Bluetooth input with priority. Please make sure the Bluetooth is disconnected when using line input.



Parameters:

Audio input: Bluetooth / stereo RCA

Audio output: banana speaker jacks

Speaker impedance: 4-8Ω

Ampifier class: class D

Quiescent current: 60mA

Work efficiency: > 90%

Output Power:

315W / 4Ω, 10% distortion

185W / 8Ω, 10% distortion

260W / 4Ω, 1% distortion

150W / 8Ω, 1% distortion

Frequency response: 20Hz-20KHz

Dynamic range: >100 dB

Signal to noise ratio: > 111dB

Working voltage: AC 100-240V

Dimensions(W*D*H): 189*183*52mm / 7.44*7.20*2.04in

Net weight: 1.45kg / 3.19lb

Package weight: 2.0kg / 4.40lb



Packing List:

1*Digital Amplifier

1*Power Cord

• With stereo RCA and wireless Bluetooth input, supporting iPod, Phone, MP3 players, TV, MP3, CD players, laptop, desktop computer or other devices input. Adopting QCC3003 Bluetooth chip that has strong compatibility with much Bluetooth devices to achieve lossless transmission.
• Super large output power that can reach 300W +300W, easily to drive large passive speakers, matched very well with outdoor/ bookshelf/ computer/ desktop /ceiling /floor standing speakers.
• With tone control, treble, mid and bass can be adjusted independently to provide much delicate sound that suits different listening style, and a bypass switch(treble knob) is specially designed to turn on/off the tone control to enjoy original sound, adding much fun and higher playability.
• High quality components are used to ensure HiFi sound and long time stable work. Built-in large power high-efficiency switching power supply, AC 100-240V working voltage for global use.
• High-precision chip resistors for better signal-to-noise ratio. Special inductance for audio to ensure clear and powerful sound. Pure aluminum chassis and fine process, with good heat dissipation.

User questions & answers

Question:	Is tje 150watts per channel, or 150 watts total power? I don't see where it specifies.Thank you
Answer:	Hello. It is 300W per channel @ 4 ohm.
Question:	iis power adapter included
Answer:	Hello. Its power supply is inside. The device only need a power cord and it is also included.
Question:	Is the power output in peak or rms
Answer:	Hello. It is RMS.
Question:	What about adding a subwoofer
Answer:	Hello. We are sorry this is only a two channel amplifier. Maybe you can try our professional sub amp https://www.amazon.com/dp/B07MR6YCQ1?ref=myi_title_dp https://www.amazon.com/dp/B08D6G9CB7?ref=myi_title_dp