Expert Service 1-877-289-7664 [Hours]

Boom. SUBTEMBER is here!
Narrow Your Results
Price range:
$37.95 $2399.99
$
to
$

Number of Channels:

Amplifier Series:

Minimum Impedance Unbridged:

CEA-2006 Compliant:

Maximum Input Gauge Size:

Monoblock Amplifiers

1000W RMS Class D Monoblock HFi Series Amplifier

HFi Series Monoblock Class D Car Amplifier • 750W x 1-Chan. @ 2 Ohms • 1000W x 1-Chan. @ 1 Ohms • Wired HFR-3 Bass Remote • 4-Way System Protection Circuitry • Preamp RCA Outputs • Blue Illuminated Hifonics Badge

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$129.95

IN STOCK

200W Monoblock Class A/B Car Amplifier

• Total Peak Power: 200W
• Variable Low-Pass Filter (50-250 Hz, 24 dB/octave)
• Dimensions: 1.625"W x 4"L x 3.125"H

$39.99

IN STOCK

1800W RMS Class D Monoblock BB Series Car Amplifier

• RMS: 780W x 1 @ 4 ohms, 1260W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 3000W
• 1 Pair of Preamp Outputs
• Bass Boost 0-12 dB from 30-80 Hz
• Subsonic Filter from 20-50 Hz
• Dimensions: 13-3/4"W x 8-1/4"D x 2-1/4"H

25% off a 4 Gauge Amp Kit with Purchase

$149.99

IN STOCK

Micro-V Series 300W RMS Monoblock Class D Compact Car Amplifier (MVPA.1)

• Incredibly Tiny! The size of a postcard!
• RMS: 200 x 1 @ 4 ohms, 300W x 1 @ 2 ohms
• Total RMS Power: 300W
• CEA-2006 Compliant
• Switchable Bass Boost: (0dB/+6dB/+12dB)
• Extremely Small Footprint
• Dimensions: 4"W x 5-7/16"L x 1-9/16"H

Save 25% on a Complete 8 Gauge Amp Kit!

$159.99

IN STOCK

1500W RMS Class D Monoblock HFi Series Amplifier (HFi 1500D)

• HFi Series Monoblock Class D Car Amplifier
• 1000W x 1-Chan. @ 2 Ohms
• 1500W x 1-Chan. @ 1 Ohms
• Wired HFR-3 Bass Remote
• 4-Way System Protection Circuitry
• Preamp RCA Outputs
• Blue Illuminated Hifonics Badge

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$159.99

IN STOCK

1500W Max Monoblock Armor Series Class A/B Car Amplifier

• RMS: 700W x 1 @ 4 ohms
• Peak: 1500W x 1 @ 2 ohms
• Wired Bass Remote Included
• Bass Boost 0-18 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 10-1/3"L x 5"W x 2-3/16"H

10% off 4 Gauge Amp Wiring Kit with Purchase

$59.99

IN STOCK

500W True RMS, 1-Channel Monoblock Amplifier with Digital Input Mixer and Graphical Status Display

• RMS: 500 x 1 @ 4 ohms, 500W x 1 @ 2 ohms
• Total RMS Power: 500W
• CEA-2006 Compliant
• DSP (Digital Signal Processing)
• Sophisticated Crossover Functions and Selectable Crossover Slopes
• Dimensions: 8-13/16"L x 7-1/4"W x 2-13/16"H

25% Off NVX XKIT42 4 gauge amp kit with Purchase!

$229.99

IN STOCK

3000W Max Anarchy Series Class D Monoblock Power Amplifier

• RMS: 1000W x 1 @ 4 ohms, 1500W x 1 @ 2 ohms, 2100W x 1 @ 1 ohm
• Total Peak Power: 3000W
• Illuminated Logo
• Bass Boost 0-18 dB
• Chrome-Plated Connections
• Dimensions: 13"L x 10"W x 2-3/16"H

$102.95

IN STOCK

1200W RMS Class NextGen Super-D Monoblock Brutus Series Amplifier

• RMS Power: 450W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total RMS Power: 1200W
• CEA-2006 Compliant
• Bass Boost: 0-10 dB at 40 Hz
• Aluminum Alloy Heatsink with Illuminated Hifonics Logo

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$169.99

IN STOCK

1500W EVOLUTION Series Monoblock Class A/B Amplifier

• 750W x 2 Chan. @ 4 Ohms
• 1500W x 2 Chan. @ 2 Ohms
• Soft Turn-On Circuit
• Nickel-Plated Terminals
• Variable Bass EQ

$68.65

IN STOCK

1100W Max Class A/B Riot Series Monoblock Car Amplifier

• RMS: 250W x 1 @ 4 ohms
• Total Peak Power: 1100W
• Hi-Level Inputs
• 9.13" W x 10.44" L x 2.25" H

50% off NVX 2-Channel RCA Cables w/ purchase!

$56.95

IN STOCK

2400W Max Class D Monoblock Zeus Series Amplifier

• Peak: 650W x 1 @ 4 ohms, 1200W x 1 @ 2 ohms, 2400W x 1 @ 1 ohm
• Total Peak Power: 2400W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 17-3/16"L x 10"W x 2-7/16"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$179.95

IN STOCK

1200W RMS Class D Monoblock BB Series Car Amplifier

• RMS: 540W x 1 @ 4 ohms, 900W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total Peak Power: 2000W
• 1 Pair of Preamp Outputs
• Bass Boost 0-12 dB at 30-80 Hz
• Subsonic Filter From 20-50 Hz
• Dimensions: 12-1/2"W x 8-1/4"D x 2-1/4"H

25% off a 4 Gauge Amp Kit with Purchase

$109.99

IN STOCK

2000W RMS Class NextGen Super-D Monoblock Brutus Series Amplifier

• RMS: 700W x 1 @ 4 ohms, 1400W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm
• Total RMS Power: 2000W
• CEA-2006 Compliant
• Bass Boost: 0-10 dB at 40 Hz
• Aluminum Alloy Heatsink with Illuminated Hifonics Logo
• Dimensions: 16-11/16"L x 10-5/16"W x 2-1/2"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$239.99

IN STOCK

2400W RMS Class NextGen Super-D Monoblock Brutus Series Amplifier

• RMS: 850W x 1 @ 4 ohms, 1600W x 1 @ 2 ohms, 2400W x 1 @ 1 ohm
• Total RMS Power: 2400W
• CEA-2006 Compliant
• Bass Boost: 0-10 dB at 40 Hz
• Aluminum Alloy Heatsink with Illuminated Hifonics Logo
• Dimensions: 18-11/16"L x 10-5/16"W x 2-1/2"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$289.99

IN STOCK

500W RMS Monoblock Single Channel Class D Prime Series Amplifier

• RMS: 300W x 1 @ 4 ohms, 500W x 1 @ 2 ohms
• Total RMS Power: 500W
• CEA-2006 Compliant
• Punch Bass: 0 to +12 dB
• Class D Circuitry
• Dimensions: 8-1/2"L x 6-3/4"W x 2"H

25% off a 4 Gauge Amp Kit with Purchase

$149.95

IN STOCK

5000W Max Anarchy Series Class D Monoblock Power Amplifier

• RMS: 1800W x 1 @ 4 ohms, 2500W x 1 @ 2 ohms, 3500W x 1 @ 1 ohm
• Total Peak Power: 5000W
• Illuminated Logo
• Bass Boost 0-18 dB
• Chrome-Plated Connections
• Dimensions: 18"L x 10"W x 2-3/16"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$159.95

IN STOCK

1500W Max Anarchy Series Monoblock Power Amplifier

• RMS: 1100W x 1 @ 4 ohms
• Peak: 1500W x 1 @ 2 ohms
• Illuminated Logo
• Bass Boost 0-18 dB
• Chrome-Plated Connections
• Dimensions: 10"L x 10"W x 2-3/16"H

25% off a 4 Gauge Amp Kit with Purchase

$64.99

IN STOCK

1100W RMS Class NextGen Super-D Monoblock Brutus Series Amplifier

• RMS: 450W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1100W x 1 @ 1 ohm
• Total RMS Power: 1100W
• CEA-2006 Compliant
• Bass Boost: 0-10 dB at 40 Hz
• Aluminum Alloy Heatsink with Illuminated Hifonics Logo
• Dimensions: 14-3/8"L x 10-5/16"W x 2-1/2"H

25% off a 4 Gauge Amp Kit with Purchase

$159.99

IN STOCK

1800W Max V-Drive Series Class D Single Channel Monoblock Car Audio Amplifier

• Peak: 450W x 1 @ 4 ohms, 900W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 1800W
• Wired Bass Level Remote
• Bass Boost: 0-10 dB
• Illuminated Badge and Heatsink
• Dimensions: 12-3/16"L x 9-1/2"W x 2-1/8"H

Save 50% on the NVX Bass Expanding Processor w/ Purchase!

$119.99

IN STOCK

1500W Max, Monoblock RAZOR Series Full Range Class D Car Amplifier

• RMS: 600W x 1 @ 4 ohms, 900W x 1 @ 2 ohms
• Total Peak Power: 1500W
• Wired Bass Remote Included
• Bass Boost: 0-12 dB
• Class D Circuitry
• Dimensions: 4-3/4"W x 10"L x 1-1/3"H

25% off a 4 Gauge Amp Kit with Purchase

$89.99

IN STOCK

500W RMS Class D 1-Channel Monoblock Performance Series Car Power Amplifier

• RMS: 300 x 1 @ 4 ohms, 500W x 1 @ 2 ohms
• Total RMS Power: 500W
• CEA-2006 Compliant
• Bass Boost: 0 - 18 dB at 40 Hz
• Class D Circuitry
• Dimensions: 9-7/16"W x 7-9/16"L x 2-3/16"H

25% off a 4 Gauge Amp Kit with Purchase

$119.99

IN STOCK

1200W RMS GM Digital Series Class D Monoblock Amplifier

• RMS: 500W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total Peak Power: 2400W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB
• Class D Circuitry
• Dimensions: 12-3/8"W x 7-7/8"D x 2-3/8"H

50% off NVX 2-Channel RCA Cables w/ purchase!

$199.99

IN STOCK

1200W Max Class D Monoblock Zeus Series Amplifier

• Peak: 400W x 1 @ 4 ohms, 600W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total Peak Power: 1200W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 45 Hz
• Wired Bass Remote Included
• Dimensions: 12"L x 10"W x 2-7/16"H

20% Off XS Power Battery with Purchase of Select Amplifiers!

$129.95

IN STOCK

1100W Max ZR Series Class D Monoblock Amplifier

• 330W RMS x 1 Chan. @ 4 Ohms
• 600W RMS x 1 Chan. @ 2 Ohms
• 1100W Max
• High-Level Sensing Power On Feature
• Gold Plated Speaker Terminals
• Active Thermal Control

25% off a 4 Gauge Amp Kit with Purchase

$104.95

IN STOCK

1000W RMS Class D Monoblock Performance Series Car Amplifier

• RMS Power: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms
• Total Peak Power: 2000W
• CEA-2006 Compliant
• Dimensions: 13-13/16"W x 7-9/16" D x 2-3/16"

25% off a 4 Gauge Amp Kit with Purchase

$179.95

IN STOCK

True 1200W RMS, Class D Monoblock Amplifier with Bass Remote

• RMS: 500W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total RMS Power: 1200W
• CEA-2006 Compliant
• Wired Bass Remote Included
• Ultra Efficient Class D Design
• Dimensions: 6-7/10"W x 12-8/10"L x 1-8/10"H

25% off a NVX True 1/0 Gauge Amp Kit with Purchase!

$259.99

IN STOCK

2600W BRUTUS X-14 Series Class-D Monoblock 1-Channel Amplifier

• RMS Power: 1100W x 1 @ 4 ohms, 1900W x 1 @ 2 ohms, 2600W x 1 @ 1 ohm
• Total Peak Power: 2600W
• CEA-2006 Compliant/Preamp Outputs/LPF
• 17.72"W x 2.5"H x 9.49"L

25% off a NVX True 1/0 Gauge Amp Kit with Purchase!

$279.95

IN STOCK

1200W RMS Prime Series Monoblock Class D Car Amplifier

• RMS: 400W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total RMS Power: 1200W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Class D Circuitry
• Dimensions: 6-3/4"L x 11-1/16"W x 2"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$259.95

IN STOCK

2200W BRUTUS X-14 Series Class-D Monoblock 1-Channel Amplifier

• RMS Power: 950W x 1 @ 4 ohms, 1600W x 1 @ 2 ohms, 2200W x 1 @ 1 ohm
• Total Peak Power: 2200W
• CEA-2006 Compliant/Preamp Outputs/LPF
• 13.39"W x 2.5"H x 9.49"L

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$209.95

IN STOCK

5000W Max, Phantom Series Class D Monoblock Power Amplifier

• 1 ohm: 5000 watts x 1 chan.
• RMS power output: 1800 watts x 1 chan.
• Wired remote subwoofer level control
• Nickel-plated speaker and power terminals
• Subsonic Filter

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$149.99

IN STOCK

2300W Max, Monoblock RAZOR Series Full Range Class D Car Amplifier

• RMS: 900W x 1 @ 4 ohms, 1400W x 1 @ 2 ohms
• Total Peak Power: 2300W
• Wired Bass Remote Included
• Bass Boost: 0-12 dB
• Class D Circuitry
• Dimensions: 4-3/4"W x 11"L x 1-1/3"H

25% off a 4 Gauge Amp Kit with Purchase

$104.99

IN STOCK

1500W Max, Evolution Series Monoblock Power Amplifier

• 600W x 1 Chan. @ 4 Ohms
• 1500W x 1 Chan. @ 2 Ohms
• Speaker Short Protection
• Soft Turn-On Circuit
• Nickel-Plated Terminals
• Variable Bass EQ

$69.99

IN STOCK

3200W Max Class D Monoblock Zeus Series Amplifier

• Peak: 800W x 1 @ 4 ohms, 1600W x 1 @ 2 ohms, 3200W x 1 @ 1 ohm
• Total Peak Power: 3200W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 19-15/16"L x 10"W x 2-7/16"H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$239.95

IN STOCK

1500W Max Phantom Series Monoblock MOSFET Power Amplifier

• RMS: 350W x 1 @ 4 ohms
• Peak: 1500W x 1 @ 2 ohms
• Wired Bass Remote Included
• Bass Boost 0-18 dB
• Line and Speaker Level Inputs
• Dimensions: 9-1/2" D x 10" W x 2-1/4" H

25% off a 4 Gauge Amp Kit with Purchase

$67.15

IN STOCK

5500W Max Class D Monoblock BAMF Series Amplifier

• RMS: 1700W x 1 @ 4 ohms, 2300W x 1 @ 2 ohms, 3200W x 1 chan @ 1 ohm
• Total Peak Power: 5500W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 1 Pair of Preamp Outputs
• Dimensions: 16-7/8"L x 8-1/4"W x 2-1/8"H

50% off NVX 2-Channel RCA Cables w/ purchase!

$221.00

IN STOCK

500W V-Power Series Class D Monoblock Digital Amplifier

• RMS: 300W x 1 @ 4 ohms, 500W x 1 @ 2 ohms
• Total Peak Power: 500W
• CEA-2006 Compliant Amplifier
• 4-Channel Speaker-Level Inputs
• Heavy Duty Aluminum Alloy Heat-Sink
• Dimensions: 7-7/8"W x 7-7/8"L x 2-3/16"H

20% Off XS Power Battery with Purchase of Select Amplifiers!

$169.99

IN STOCK

600W Monoblock Class D XD Series Car Amplifier

• RMS Power: 600W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms
• Variable Slope Low Pass Filter
• 1 Pair of Preamp Outputs
• Dimensions: 14-3/4" W x 7-1/8" D x 2" H

$419.95

IN STOCK

Only 2 Left!

4500W Max Onyx Series Class D Monoblock Power Amplifier

• RMS: 2100W x 1 @ 4 ohms
• Peak: 3500W x 1 @ 2 ohms, 4500W x 1 chan @ 1 ohm
• Class D Circuitry
• Bass Boost 0-18 dB
• Line and Speaker Level Inputs
• Dimensions: 15-1/4" L x 10" W x 2-3/16" H

50% off NVX 2-Channel RCA Cables w/ purchase!

$119.99

IN STOCK

850W RMS Sedona Series Class D Monoblock Amplifier

• RMS: 350W x 1 @ 4 ohms, 600W x 1 @ 2 ohms, 850W x 1 @ 1 ohm
• Total RMS Power: 850W
• Class D Circuitry
• Selectable Bass Boost: 0, +6, or +12 dB at 55 Hz
• High-Level Inputs
• Dimensions: 13-1/2"L x 9-1/2"W x 2-3/8"H

$119.95

IN STOCK

2000W Max, Class D Monoblock BAMF Series Amplifier

• RMS: 600W x 1 @ 4 ohms, 900W x 1 @ 2 ohms, 1200W x 1 chan @ 1 ohm
• Total Peak Power: 2000W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 1 Pair of Preamp Outputs
• Dimensions: 11-3/8"D x 8-1/4"W x 2-1/8"H

50% off NVX 2-Channel RCA Cables w/ purchase!

$129.95

IN STOCK

1900W BRUTUS X-14 Series Class D Monoblock 1-Channel Amplifier

• RMS Power: 800W x 1 @ 4 ohms, 1400W x 1 @ 2 ohms, 1900W x 1 @ 1 ohm
• Total Peak Power: 1900W
• CEA-2006 Compliant
• 13.39"W x 2.5"H x 9.49"L

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$189.95

IN STOCK

4000W Mean Machine Series Monoblock Amplifier

• RMS Power: 1000W x 1 @ 4 ohms, 2000W x 1 @ 2 ohms, 4000W x 1 @ 1 ohm
• Total Peak Power: 4000W
• Fully Adjustable Pro-Design Crossovers
• Dimensions: 9.72" W x 12.6" L x 2.28" H

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$149.99

IN STOCK

2500W EVOLUTION Series Monoblock Class A/B Car Amplifier

• 1250W x 1 Chan. @ 4 Ohms
• 2500W x 1 Chan. @ 2 Ohms
• Peak Power: 2500W
• Soft Turn-On Circuit
• Nickel-Plated Terminals
• Variable Bass EQ

$104.95

IN STOCK

1100W BRUTUS X-14 Series Class-D Monoblock 1-Channel Amplifier w/ 2-year Warranty

• RMS Power: 400W x 1 @ 4 ohms, 700W x 1 @ 2 ohms, 1100W x 1 @ 1 ohm
• Total Peak Power: 1100W
• CEA-2006 Compliant
• Class D Monoblock

20% Off XS Power Battery with Purchase of Select Amplifiers!

$149.95

IN STOCK

300W RMS, Class D Mono Block CX Series Car Amplifier

• RMS: 150W x 1 @ 4 ohms, 300W x 1 @ 2 ohms
• Total Peak Power: 600W
• CEA-2006 Compliant
• Bass Boost 0-12 dB at 40 Hz
• Vertical Mounting Option
• Dimensions: 7-3/16"W x 8-1/8"D x 2-3/8"H

Free Gift: 1.0 Farad Capacitor with Amp Purchase!

$149.95

IN STOCK

2500W Max Monoblock ARMOR Series Class A/B Car Amplifier

• RMS: 1400W x 1 @ 4 ohms
• Peak: 2500W x 1 @ 2 ohms
• Wired Bass Remote Included
• Bass Boost 0-18 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 16-1/3"W x 5"D x 2-8/10"H

25% off a 4 Gauge Amp Kit with Purchase

$79.95

IN STOCK

3000W RMS Class D Monoblock BB Series Car Amplifier

• RMS: 1200W x 1 @ 4 ohms, 1800W x 1 @ 2 ohms, 3000W x 1 @ 1 ohm
• Total Peak Power: 5000W
• 1 Pair of Preamp Outputs
• Bass Boost 0-12 dB from 30-80 Hz
• Subsonic Filter from 20-50 Hz
• Dimensions: 20-3/8"W x 8-1/4"D x 2-1/4"H

50% off 1/0 Gauge Amplifier Kit with Purchase of Belva Amp

$249.99

IN STOCK

1800W Consumer Line Series Monoblock Class D Amplifier

• Power: 750W x 1 @ 4 ohms, 1150W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 1800W
• Adjustable Low Pass Filter
• High Quality Aluminum Heat Sink
• Dimensions: 7" W x 17" L x 2.2" H

$199.99

IN STOCK

5500W Max Onyx Series Class D Monoblock Power Amplifier

• RMS: 2300W x 1 @ 4 ohms
• Peak: 4000W x 1 @ 2 ohms, 5500W x 1 chan @ 1 ohm
• Class D Circuitry
• Bass Boost 0-18 dB
• Line and Speaker Level Inputs
• Dimensions: 18-1/8" L x 10" W x 2-3/16" H

50% off NVX 2-Channel RCA Cables w/ purchase!

$159.99

IN STOCK

Items per page: 20 50 100

Related Categories

Amplifier Wiring Kits
Get all the cables, wires, and hardware you need to install your new car audio amplifier with one of these power amp kits. Amplifier wiring kits come with your basic power and ground cables, as well as other necessary wires. Select complete amplifier kits will include speaker wire, RCA interconnect cables, and more! To make sure you get the kit that is best designed for your car audio system, scroll down to the bottom of this page for the buying guide.
Capacitors
Car audio capacitors are a great addition to any aftermarket audio system that is in need of a little extra power. Capacitors store a temporary electrical charge that can be released during periods of extra power strain. If a vehicle has dimming headlights when music is played, a capacitor could solve that problem.
Sound Processors
For those who want the most out their car audio system, a quality sound processor is a must. After some slight adjustments, your systems will sound like it has been professionally tuned and optimized. Tune your system to perfection with these crossovers, equalizers, and bass drivers.

Monoblock Amplifiers Information

Mono Subwoofer Amplifiers

Mono amplifiers are single channel amps, but they can be used to power more than one subwoofer. Mono amps typically produce more power than multi-channel amps, which makes them ideal for powering subwoofers. Class D mono amps are the most efficient of all amplifier designs because they draw less current and as a result generate less heat in comparison to the classic mono amplifier design.

A mono amplifier puts out only one channel of sound, as opposed to a stereo amp that puts out two channels of sound. A mono amp is generally used for extremely low frequencies, such as bass, that are channeled into a single subwoofer. It doesn't matter that both stereo channels are combined for these low bass frequencies because you couldn't tell which channel the sounds are coming from anyway because you feel the sound pressure more than hear the sound.