The 7 Best 4 Ohm Mono Amps (2023 reviews)

We consider a 4 ohm mono amp to be a worthy investment in the long run. We are here to help you choose the right one for your purposes from all the best available products in market today.

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Our Top Picks:

Best Overall: Buy: Hifonics 4 Ohm Mono Amp READ REVIEW

Best For competition: Buy: Skar Audio 4 Ohm Mono Amp READ REVIEW

Best For Car Speaker: Buy: Taramps 4 Ohm Mono Amp READ REVIEW

Best With capacitor: Buy: Amazon Renewed 4 Ohm Mono Amp READ REVIEW

Best For The Money: Buy: CT Sounds Mono Amplifier READ REVIEW

Best With woofer: Buy: Polk Audio 4 Ohm Mono Amp READ REVIEW

Best For Small Install space: Buy: CT Sounds 4 Ohm Mono Amp READ REVIEW

Best Overall: Hifonics 4 Ohm Mono Amp

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Hifonics has been making great amp for years, thanks to a combination of clever design and high-end materials. This amp puts out power non stop. It is producing true raw power and low frequencies. It comes with 2 sets of speaker terminals so it can wire more subs. If your set up is a little off adjustment like on the boost level, the bass knob will light up red and no more sound will emit, but a minor adjustment to it, restart your car, and your back in business. It truly is amazing the sound quality is crisp and clear.

This feature is there to not allow an overload and protect both your amplifier and speakers which you work so hard to pay for and own.

• Goes into protect mode only with half level and gain
• Delivers what they promise

Best For competition: Skar Audio 4 Ohm Mono Amp

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For a low asking price, skar audio 4 ohm mono amp has managed to overwhelm their customers by packing as many features as they could. This amp should give you 1000 watts of rms easily. It is designed to run subwoofers. It delivers well over 1200w at 1ohm. It even comes with a alan key and bass knob. It will cover the RMS power rating but depending on how hard u plan to push the speakers, u will wind up over working the amp and potentially burning up the speakers and the amp.

It is 1-ohm stable and utilizes a wide array of premium internal components that make it extremely powerful and reliable. It puts out amazing power and doesn't get hot.

• Worked flawlessly with two kicker single 4 ohm subs
• Fit great under the driver seat of the wrangler
• Plenty of power, easy to install
• Very clean and awesome volume in an open cockpit

Best For Car Speaker: Taramps 4 Ohm Mono Amp

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Various types of car audio systems, whether external or internal, the HD line delivers sophistication and robustness with powerful and mono amplifiers. It is made for most car speaker applications. The Full-range amplifier can operate on all frequencies using the right measure. It protects the amp from overheating with 3 speeds.

It is a mono amplifier and its maximum power is 3000w rms with 4 ohms impedance, and one 3000w rms channel.

• Output short circuit / high or low supply voltage / thermal protection
• Ideally made for most car speaker applications
• Excellent for voice as well as bass

Best With capacitor: Amazon Renewed 4 Ohm Mono Amp

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The amazon renewed 4 ohm mono amp gives the top-tier amp a run for their money by offering flagship specs at a much more affordable price. This certified refurbished product is tested and certified to look and work like new. It includes functionality testing, basic cleaning, inspection, and repackaging. It has the tools to properly adjust the levels. They may not have the loudest or hardest hitting stuff but they will last and they have really good sound. It's compact, easy to install. It comes with all relevant accessories, a minimum.

• Led power (green) and protect (red) indicators
• 4 gauge power and ground wiring
• Great bass sound,it's only small but sound perfect

Best For The Money: CT Sounds Mono Amplifier

Buy on Amazon

It’s all about the dual voice coil configuration. It features high voltage, low voltage, over current, and high-temperature protection. The user-adjustable controls feature a gain control, low pass filter (lpf), subsonic filter, and bass boost so that you can get the exact sound you are looking for out of your mono amplifier.

The amp comes out to 1ohm at 1000watt rms while the subwoofers are rated 250rms x 4 subs=1000watt rms for the amp and your subs. The edge inductors allow for maximum current flow and power output making this amplifier extremely efficient. It will work if you wire the subs to a final 1 ohm load.

• Good investment for long term
• Good brand reputation

Best With woofer: Polk Audio 4 Ohm Mono Amp

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This Polo Audio Monoblock amplifier is an incredibly sleek class d mobile audio amp with a toroidal transformer that makes it run cleanly and efficiently in just a. It comes with thermal, dc offset, reverse dc voltage, and short circuit protection for peace of mind. The heat dissipation on this amp is fantastic as well.

This amp is 1 Ohm stable at 1200 watts. It includes level control and adjusts the gain of the channel to match the output voltage from your head unit. It is a safety measure built into the amp. It will literally take your breath away.

• Sturdy and compact which allows for discrete mounting
• Stable at 1 ohm and extremely powerfull and clean
• Compact, durable and powerful all while producing high fidelity sound

Best For Small Install space: CT Sounds 4 Ohm Mono Amp

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The amp itself includes many features not standard on many budget amps such as variable subsonic (for protecting subs in ported enclosures) and variable bass frequency and boost. It features high voltage, low voltage, over current, and high-temperature protection. The user-adjustable controls feature a gain control, low pass filter (lpf), subsonic filter, and bass boost so that you can get the exact sound you are looking for out of your mono amplifier.

The amp also draws only 300mA at idle. The included remote bass level control gives you extra flexibility of adjusting how much or little bass you have from the comfort of your front seat. The amp also includes dual speaker outputs and 4ga power/ground connections. It is designed for small install space.

• Lot of satisfied buyers
• Good investment for long term