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Kenwood KAC-M1824BT

Compact 4-channel amplifier with Bluetooth® connectivity — 45 watts RMS x 4

Item # 113M1824BT

Kenwood's KAC-M1824BT 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel...

Kenwood's KAC-M1824BT 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel...

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About the Kenwood KAC-M1824BT

Power your music on land or sea

Kenwood's KAC-M1824BT 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel — that's more than twice the power of most car stereos. The super-compact KAC-M1824BT will add new clarity and impact to the basic sound system of almost any kind of vehicle on land or water, and it'll fit in a lot of places when space is tight. The amp uses plastic plugs that protect its power and speaker connections, and features a conformal coated circuit board that keeps out moisture and salt, so the party won't stop just because of a little wetness.

Power your music on land or sea

Kenwood's KAC-M1824BT 4-channel amplifier will pump up your car's audio system with 45 watts RMS per channel — that's more than twice the power of most car stereos. The super-compact KAC-M1824BT will add new clarity and impact to the basic sound system of almost any kind of vehicle on land or water, and it'll fit in a lot of places when space is tight. The amp uses plastic plugs that protect its power and speaker connections, and features a conformal coated circuit board that keeps out moisture and salt, so the party won't stop just because of a little wetness.

Play music wirelessly — no receiver necessary

If you store all your music on your phone or other portable device, you can use the KAC-M1824BT's wireless Bluetooth connection to play your tunes — a great feature if you don't have room to install a receiver. The wired remote controls the volume and track selection. A USB port on the amp lets you recharge your device, so you won't miss a beat of the fun.

It also works with a receiver

The KAC- M1824BT comes with RCA connections so you can use it with an aftermarket receiver. It can handle speaker-level signals as well, so you can still get input from a radio without RCA outputs. The amp senses incoming high-level signals and turns itself on, eliminating the need to install a separate remote turn-on wire.

Bluetooth note: Use of this amplifier's Bluetooth features will depend upon your phone's Bluetooth capabilities. Learn more in our article explaining Bluetooth profiles.

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Product highlights:

  • compact 4-channel amplifier for car, motorcycle, and boat
  • 45 watts RMS x 4 at 4 or 2 ohms
  • 90 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • wireless Bluetooth connection via wired remote controller
    • Apt X technology improves Bluetooth sound quality
    • supports AAC files for iPhone® users
  • USB port for charging your portable device
  • conformal-coated circuit board — suitable for marine applications
  • MOSFET power supply and Class D amp technology
More Features:
  • preamp and speaker-level inputs
  • preamp outputs
  • signal-sensing turn-on on speaker-level inputs eliminate need for a separate remote lead
  • 10-gauge power and ground leads recommended
  • fuse rating: 15A x 1
  • dimensions: 6-11/16"W x 1-13/16H x 3-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # KAC-M1824BT

What's in the box:

  • Bluetooth 4-Channel amplifier with a 15A ATM mini-fuse installed
  • 59" Wiring harness (22-pin Molex plug on one end)
  • Remote control/Bluetooth control unit with attached 10.5' cable (12-pin Molex connector on one end)
  • Remote Unit mounting bracket
  • 4 Self-tapping screws (M4 x 16mm)
  • Two 13.5" Plastic wire ties
  • Dual-sided adhesive tape
  • Protective Cover for Controls (1 sheet)
  • Instruction Manual/Warranty Card

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Features
Connections

Features

Compact Amplifier: The Kenwood KAC-M1824BT is a compact Class D 4-channel amplifier with Bluetooth wireless technology. The amp features a conformal coating on the circuit board to protect it from moisture. This allows you to use the amp for motorcycles, marine applications, or on All-Terrain Vehicles (ATVs). The KAC-M1824BT delivers 45 watts RMS x 4 channels at 4 or 2 ohms. It also gives you 90 watts RMS x 2 at 4 ohms bridged. The amp operates at full frequency range, and is not designed to power subwoofers.

Bluetooth: The built-in Bluetooth wireless technology lets you use your smartphone or Bluetooth digital music player as your primary listening source. This makes the amp ideal for putting a sound system in a classic car, ATV, motorcycle, or other motorized vehicle. The amp comes with a wired controller for raising or lowering the volume and changing tracks. The attached 10.5' cable allows you to place the compact amp in a remote location. The KAC-M1824BT is compatible with Bluetooth Ver.3.0 + EDR, and supports SBC, AAC, and aptX for better sound quality.

Remote: The supplied Remote Control unit's Source button lets you pair the Bluetooth device, as well as switch between sources (Bluetooth or RCA/Speaker Input). Other controls include Play/Pause, Backward Skip/Fast Backward, Forward Skip/Fast Forward, and Volume Up/Volume Down. The remote can be surface mounted using the supplied double-sided tape, or flush-mounted in the included bracket. It also has a 1/4"-20 thread (same as a camera tripod thread) that allows you to attach the remote to an optional bar mount kit.

Protection Circuitry: The amplifier features protection circuitry for thermal overload, DC offset, and short circuits. The amp stops operating when it goes into protection mode. (There are no LED indicators.)

Signal-sensing Turn-on: When the amplifier is connected to a factory head unit, or an aftermarket unit without preamp outputs, you can splice the head unit's speaker wires to a speaker-to-male RCA adapter. In this case, the amplifier's Signal-sensing Turn-on feature will turn on the amp when a signal is detected on the input. This eliminates the need to connect a turn-on lead to the amp's Power Control (blue) wire.

Note: If your only using Bluetooth and no other input (speaker-level or RCA) you will need to hook up the turn-on lead.

Mounting: The KAC-M1824BT can be mounted onto an installation board (5/8" thick or more) using the supplied M4 x 16mm self-tapping screws. Two 13.5" plastic wire ties are included for securing the amplifier to a 2x4 board or other narrow item.

Connections

Power Connections: The power, ground, power control, and speaker output wires are included in the supplied 6' wiring harness. The 16-gauge yellow power wire can be spliced into the continuous power wire for the head unit. It is not necessary to run the power wire directly to the battery. The ground wire should be run to the vehicle's chassis.

Power Control: The Power Control (blue) wire should be connected to the head unit's remote turn-on lead when an aftermarket unit is used. This wire does not need to be connected if you're using speaker level inputs. The Signal-sensing Turn-on feature will turn on the amplifier when an input signal is detected.

Line-Level Inputs: The amplifier is equipped with two pairs of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp. If using a factory head unit, or a unit without preamp outputs, you can splice the speaker wires to an RCA plug, maintaining the same polarity.

Line-Level Outputs: In addition to the line inputs, the KAC-M1824BT has one pair of RCA line outputs. This allows you to feed the input signal to another amplifier, if desired.

Speaker Outputs: The included harness has eight 20-gauge wires for connecting your speakers to the amp. You can connect the eight wires to the 4 speakers in a Front Left & Right and Rear Left & Right configuration. By bridging the amplifier, you can get higher power output to two 4-ohm speakers. The amp's Output Mode switch should be placed in the appropriate position depending upon how the speakers are wired: Stereo 4-channel or Bridged 2-channel. The wiring diagram for both configurations can be found in the instruction sheet.

USB Charging Port: A Type A USB port is provided on the amplifier for charging an iPod, iPhone, or Android device. For charging your device, you should use the cable included with your device or the optional KCA-iP102 (30-pin), KCA-iP103 (Lightning), or Micro USB 2.0 (Android) charging cable.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
It's awesome to deal with River, she's the audio expert!!! [ Carlos  May 22, 2019 ]
A
Golf Cart. [ Joshua  Jun 23, 2017 ]

25 questions already asked

Q
My M1824BT was working. At one point I mistakenly pushed the volume quite load and now I have no sound. The speakers are ok. The unit powers on and connects to my phone and can control pause/play etc. I did see in the .manual' that there is some protection mechanism - I'm assuming that has engaged and I don't know how to reset it. Any ideas?
[ Jerry  Oct 01, 2019 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
[ Krissy  Oct 17, 2019 ]  Staff
Q
I'm hooking this up to two 8" speakers. How much bass will their be without any bass boost or gain control?
[ ryan  Aug 21, 2019 ]
2 answers
A
It would depend largely on the power handling and efficiency of the speakers. Do you know the specs of the speakers you will be powering it with?
[ Cosmo  Aug 31, 2019 ]  Staff
A
Its OK but not a lot. On a scale of 1 to 10 id give it a 6.
[ Tom  Aug 27, 2019 ]
Q
Will this amp be able to push 4 Infinity 822mlw 8in. marine speakers? No Sub will be used.
[ Adrian  Jul 08, 2019 ]
1 answer
A
Hi Adrian, thank you for your question. The Kenwood KAC-M1824BT will push your Infinity speakers, but depending on the way you're looking to use your speakers, there could be a more efficient option for you to check out. Please chat with an Advisor online, or by phone at 1-800-324-9695. They will be happy to discuss your specific needs for your new system, and insure that you purchase the gear that will work best for you.
[ Jess  Jul 19, 2019 ]  Staff
Q
I purchased this system last year and it worked fine until last week. Now, as soon as the Bluetooth is connected, there is a pop in the speakers and the system turns itself off. Why?
[ David  Jun 07, 2019 ]
2 answers
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
[ Krissy  Jun 14, 2019 ]  Staff
A
I never use the bluetooth feature of this amp as my infotainment system has built in bluetooth.
[ David  Jun 08, 2019 ]
Q
How would I wire this just using 2 speakers?
[ Michael  Jan 15, 2019 ]
2 answers
A
You just terminate the two unused speaker wires. You can also run your wires bridged to increase the speaker output. It is included in the instructions which you can download before purchase. I run this unit with two speakers on a motorcycle.
[ jim  Jan 18, 2019 ]
A
I installed this system on my touring motorcycle. Each installation is unique and requires some thought on the overall layout, wiring runs... In my case I also did some very minor fabrication of an aluminum (to help dissipate heat) base plate to hold the main unit in place. I located the main unit under my rear seat in a sheltered cubby hole. I also modified a panel on my fairing to flush mount the Bluetooth controller, making it appear as if it was factory equipment. The location makes it easy to reach/use while riding. I did require smaller speakers, approximately 3.5 inches diameter, in order fit within my fairings existing frame work. Finding 3.5 inch weather resistance speakers that would handle 45 watts was by far the most time consuming part of the installation. Once the speakers were securely mounted, it was then a matter of making the speaker wiring runs to the main unit following the connection instructions in the manual (pretty straight forward). I did not mount rear speakers, left that as a future option if needed, which for two up riding, it is. Hope this helps with your project.
[ Kenneth  Jan 15, 2019 ]
Q
Can I use this as a 3 channel amp aka 2 speakers and one 4ohm subwoofer?
[ trevor  Oct 17, 2018 ]
2 answers
A
I dont know. I use it as a 4 channel with a pass through for my sub
[ David  Oct 17, 2018 ]
A
I used this amp to power 2 x 3in speakers and an 8in on a 2009 Kawasaki GSXR 1000. Works great and performs really well. I have also used this same amp in a few Harley applications with very good results. Hand down one of the best bluetooth amps and my go to for bluetooth motorcycle sound systems.
[ Stephen  Oct 17, 2018 ]
Q
Do I have to connect it to the battery or will the stock unit suffice the power?
[ Ejohn  Mar 22, 2018 ]
4 answers
A
The stock 12v accessory and 12v constant works fine. It is a low draw system.
[ jim  Apr 02, 2018 ]
A
I installed this on a Can Am Commander 1000 XT. I simply used the stock power from the ignition (on) system and did not run a new connection to the battery. Worked great.
[ Daniel  Apr 02, 2018 ]
A
I don't know what power your stock unit supplies, but I ran it direct to a fuse box out. BE VERY CAREFUL what you want to use this for: I thought (and was told) I could bluetooth music straight off my iPhone thru this in a vintage car and it is very cumbersome to use. Not recommended. I disconnected it, unhappy. You will want to connect it thru the stock unit as if connected direct to power it will have to be reset when powered on and other annoyances.
[ RICHARD  Apr 02, 2018 ]
A
I always wire an amps power source to the battery and use the headset only as the remote on/off wire for the amp.
[ Kirk  Apr 02, 2018 ]
Q
is it possible to have the RCA out plugged in to an active subwoofer while using Bluetooth as the source ?
[ Ali  Aug 23, 2017 ]
1 answer
A
Yes, the amplifier's RCA output will feed the input signal from either Bluetooth or line-in to an external amp or powered subwoofer. For more details or to discuss further, please feel free to contact an Advisor directly by phone (888.955.6000) or online chat. Thanks! My bio: https://www.crutchfield.com/advisors/larry
[ Larry  Aug 28, 2017 ]  Staff
Q
my remote box turns on and stays blue and red why it wont do anything?
[ baker  Jul 01, 2017 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer, or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Kenny  Jul 01, 2017 ]  Staff
Q
On the pre-amp outputs what is the voltage rated at?
[ Keith  Jun 04, 2017 ]
1 answer
A
On the site page for this product is the PDF of install instructions and specs for this amp.
[ RICHARD  Jun 04, 2017 ]
Q
Can I hook up two speakers and 1 sub to this amp for a cooler radio ? Any configuration would do
[ Todd  May 05, 2017 ]
1 answer
A
I put two 6 inch speakers and a 8 inch sub with this amp on my new can-am outlander max and it sounds great
[ Mark  May 05, 2017 ]
Q
The bluetooth cord for the amp is acting up it wont connect to my phone anymore do you sell the cord with out the amp ?if so where can i buy it from?
[ Arthur  Dec 04, 2016 ]
1 answer
A
Thanks for your question. Crutchfield does not have the separate components. I would recommend contacting Kenwood directly. Their Customer Service # is 800-536-9663. They should be able to help or point you in the right direction.
[ Kenny  Dec 06, 2016 ]  Staff
Q
what are the dimensions of the remote?
[ Malik  Dec 01, 2016 ]
3 answers
A
3 1/4 inch wide x 1 3/8 inch height x 1 1/4 inch deep
[ William  Dec 03, 2016 ]
A
3 7/8 "x s 1/4 " what is he using to play music on it
[ TERRY E  Dec 02, 2016 ]
A
The remote is about 2"x4" and is easy to route anywhere. The only thing is if you don't need 15' of wire. You'll have to be good at splicing wire. Over all it's a stellar unit. And I'll recommend it to anyone.
[ JUSTIN  Dec 02, 2016 ]
Q
Will the amp work for a 1973 corvette with a factory radio? The radio used 10 ohm speakers from the factory.. Can I send the speaker output to the amp without hurting the radio? I plan to use 4 ohm speakers that the amp will power. Thanks
[ Mike  Aug 22, 2016 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Kenny  Aug 22, 2016 ]  Staff
Q
I'm trying to hook up a sound system in my car and was wondering to what outputs i hook up the RCA cables as there is 3 different sets of out puts?
[ Francisco  Aug 21, 2016 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Aug 22, 2016 ]  Staff
Q
I'm not going to be using a head unit, only the amplifier via Bluetooth. can the amplifier be powered on and off from the Bluetooth remote? or will i need to install a shutoff switch.
[ brad  Aug 12, 2016 ]
1 answer
A
The amp still needs a remote turn-on lead unless you're using the amplifier's "speaker level input" capability (with signal sensing turn-on). If your only audio source with be the Bluetooth device, you will need to connect the remote turn-on lead to a 12volt switched power source in your vehicle. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Aug 15, 2016 ]  Staff
Q
If I'm using Bluetooth as my input source, will I be able to use the RCA preamp outputs of this amp to provide the RCA input for another amplifier?
[ Jared  Jul 22, 2016 ]
2 answers
A
I'm not 100% positive but I do believe soEnter an answer to this question.
[ Don  Jul 24, 2016 ]
A
The answer is yes you can. I have this unit installed on my 4wheeler. And one amp is running the 4 speakers in the front. And I have a second amp powering the speakers and crossovers in the back. The only consideration is the volume control on whatever you are using over Bluetooth. I had the gain to high on my back amp and it was causing distortions. Once I leveled it out it performed flawlessly.
[ JUSTIN  Jul 22, 2016 ]
Q
I don't see any way to control the treble or bass on the remote or the amp itself. Is there a way to add a pre-amp EQ to enhance the highs and lows to front/rear speakers and the Subs? I 'm planning on using the output RCAs to add an Amp for subs. Thanks.. Tony S.
[ El Tigre  Jul 21, 2016 ]
1 answer
A
There is no EQ or Tone controls on the amp. If your source device does not offer the audio adjustments you require, you can add an external EQ for any sources you will be physically connecting to the inputs of the amp but any Bluetooth audio will not benefit from the external EQ. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Jul 23, 2016 ]  Staff
Q
How long is the "Remote" hookup wire?
[ BluzBug  Apr 10, 2016 ]
1 answer
A
The remote turn-on wire is included in the supplied 6' wiring harness and the remote control/Bluetooth control unit comes with an attached 10.5' cable. I hope that helps.
[ Larry  Apr 13, 2016 ]  Staff
Q
Does the remote control the RCA input volume or just the BT?
[ Jeff  Apr 10, 2016 ]
2 answers
A
When using bluetooth, volume can be controlled from remote or from the bluetooth source. When using rca inputs the remote DOES NOT control volume, only the aux source does. For example, I ran a rca to 3.5mm adapter to mine so I could use the aux input to listen to my ipod classic, outputting from the headphone jack. When doing so only my ipod controls the volume, the kenwood remote does nothing to volume. However when hooked by bluetooth to my phone, the phones volume controls and the kenwoods remote will control volume. Note if the bluetooth source volume is low, even having remote volume at full will not give full volume. The source signal has to be up (about 75% or a little more) for the units to give full volume. It does get pretty dang loud. Ive mine bridged to kenwood performance series 6.5" components and it sounds great.
[ Adam  Jul 05, 2016 ]
A
Both I just installed mine. And ran it through its paces. Everything works great. The only thing is the remote length. Might need to shorten it.
[ JUSTIN  Apr 11, 2016 ]
Q
Can you hook up rca cables to this amp and run it to another amp that pushes a sub ?
[ Tater  Jan 13, 2016 ]
1 answer
A
Good news. You can certainly do that. The KAC-M1824BT has one pair of RCA line outputs. This allows you to feed the input signal to another amplifier.
[ Jeff  Jan 15, 2016 ]  Staff
Q
The Kicker advertises a 5A charging port; what's the charge from the Kenwood?
[ Brian  Jan 10, 2016 ]
1 answer
A
The USB charging port on the Kicker PXIBT50.2 is listed 5V @ 1A; The Kenwood KAC-M1824BT's USB is actually the same, 5V @ 1A. That info can be found in the owner's manual which you can view on our website under the "Details" tab of the product page.
[ Larry  Jan 13, 2016 ]  Staff
Q
Does the speaker level inputs accepts differential-balanced speaker level inputs?
[ Rick  Dec 23, 2015 ]
1 answer
A
This amp only has line-level (RCA) inputs. You can download the manual on Crutchfield's site and view the schematic. I think the unit works well for what it is. I used it to run two 4" JBL speakers on my motorcycle. My source (phone, iPod, etc) is connected thru the included Bluetooth receiver and makes its way to the amp that way. I would recommend the amp.
[ David  Dec 24, 2015 ]
Q
This amp doesn't have gain controls. Does the gain auto adjust? Also are gain controls necessary when using your smart phone as the source?
[ CHZWIZ  May 07, 2015 ]
1 answer
A
I forwarded your question to an Advisor and they responded with the following: It doesn't have gain control, but a lot of compact models don't. Most will just offer a high or low level input to use with speaker level or RCA level. The Kenwood will automatically detect the input type. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.
[ Krissy  May 12, 2015 ]  Staff
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