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Monoblock Amplifiers not CEA Compliant

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

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

$54.99

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

$119.95

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!

$172.95

IN STOCK

1500W Max Psyclone Series Monoblock Class AB Amplifier with Wired Bass Knob

• RMS: 250W x 1 @ 4 ohms, 1500W x 1 @ 2 ohms
• Total Peak Power: 1500W
• Wired Bass Remote Included
• Bass Boost: 0-18 dB
• Speaker Level Inputs
• Dimensions: 2-7/16"W x 9-1/16"L x 11-1/4"H

25% off a 4 Gauge Amp Kit with Purchase

$54.95

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

$94.99

IN STOCK

1200W Max, Auto Sound Series Class D Monoblock Amplifier (ASA600.1DX)

• Auto Sound Monoblock Class D Car Amplifier
• 150 Watts x 1 Chan. @ 4 Ohms
• 300 Watts x 1 Chan. @ 2 Ohms
• 1200 Watts Max
• 3-Way System Protection Circuitry
• LED Power And Protect Indicators
• MOSFET Power Supply

Get a FREE 4 Gauge Amp Kit with Select Amps!

$149.99

IN STOCK

4000W Max Phantom Series Class D Monoblock Power Amplifier

• RMS: 1600W x 1 @ 4 ohms
• Peak: 3000W x 1 @ 2 ohms, Peak Power: 4000W x 1
• Class D Circuitry
• Bass Boost 0-18 dB
• Wired Bass Control Included
• Dimensions: 9-1/2" D x 15"W x 2-1/4"H

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

$99.99

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

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

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!

$209.95

IN STOCK

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

1800W Max Monoblock Class D Zeus Series Car Amplifier

• Peak: 500W x 1 @ 4 ohms, 900W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 1800W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 14-13/16"L x 10"W x 2-1/3"H

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

$149.99

IN STOCK

6000W Max, Monoblock Gothic Series Car Amplifier

• RMS: 2300W x 1 @ 4 ohms, 3000W x 1 @ 2 ohms, 3700W x 1 @ 1 ohm
• Total Peak Power: 6000W
• Class D Circuitry
• Bass Boost: 0-12 dB
• 1 Pair of Preamp Outputs
• Dimensions: 17-1/2"L x 9-3/4"W x 2-3/10"H

10% off 4 Gauge Amp Wiring Kit with Purchase

$229.99

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

3000W Monoblock Mosfet Power Car Amplifier

• RMS Power: 650W x 1 @ 4 ohms, 1500W x 1 @ 2 ohms
• Total Peak Power: 3000W
• Selectable Bass Boost: 0, 6, 12 dB
• Subsonic filter (0 dB at 80 Hz)

$71.95

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

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

$239.99

IN STOCK

Only 3 Left!

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

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

$249.99

IN STOCK

450W RMS Axis Series Class AB Monoblock Car Amplifier

• RMS: 450W x 1 @ 4 ohms
• Total Peak Power: 1500W
• Wired Bass Knob Included
• Switchable Bass Boost: 0 or +18 dB at 50 Hz
• High-Level Inputs
• Dimensions: 10-5/8"W x 9-7/16"D x 2-7/16"H

$61.95

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!

$149.99

IN STOCK

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

$129.99

IN STOCK

625W RMS Class AB Single Channel Monoblock Chaos Exxtreme Series Amplifier

• RMS: 500W x 1 @ 4 ohms, 625W x 1 @ 2 ohms
• Total Peak Power: 1250W
• Wired Bass Remote Included
• Bass Boost 0-18 dB at 50 Hz
• Speaker Level Inputs
• Dimensions: 11"W x 10-5/8"L x 2-7/8"H

25% off a 4 Gauge Amp Kit with Purchase

$59.95

IN STOCK

5000W Max, Evolution Series Class D Monoblock Power Amplifier

• RMS: 1800W x 1 @ 4 ohms, 2500W x 1 @ 2 ohms
• Peak: 2200W x 1 @ 4 ohms, 3500W x 1 @ 2 ohms, 5000W x 1 @ 1 ohm
• Wired Bass Level Remote
• Bass Boost: 0-18 dB
• DataLink Cable for Connecting Two Evolution Amps
• Dimensions: 10"D x 19-1/2"W x 2-3/8"H

$169.99

IN STOCK

2500W RMS, Rubicon Series Class D Monoblock Amplifier

Rubicon Series Monoblock Car Amplifier • 1000 watts x 1 chan @ 4 Ohms • 1700 watts x 1 chan @ 2 Ohms • MOSFET Power Supply • LED Protection Indicator • SMT Built In Cooling Fan • Aluminum Alloy Heatsink

25% off a Soundstream 2 Farad Capacitor with LED Display

$259.95

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!

$142.99

IN STOCK

3000W Max Monoblock ARMOR Series Class D Car Amplifier

• RMS: 1200W x 1 @ 4 ohms
• Peak: 2200W x 1 @ 2 ohms, 3000W x 1 @ 1 ohm
• Strappable Peak: 6000W x 1 @ 2 ohms
• Bass Boost 0-12 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 12-1/3"W x 5"D x 2-8/10"H

25% off a 4 Gauge Amp Kit with Purchase

$89.99

IN STOCK

Only 1 Left!

5000W Monoblock Powerzone Series Class AB Car Amplifier

• RMS Power: 1250W x 1 @ 4 ohms, 2500W x 1 @ 2 ohms, 5000W x 1 @ 1 ohm
• Total Peak Power: 5000W
• Rugged MOSFET Pulse Width Modulation Power Supply
• Includes Wired Bass Boost Remote Control

$139.99

IN STOCK

2000W RMS Mean Machine Series Monoblock Class D Car Audio Amplifier

• RMS: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm
• Peak: 1000W x 1 @ 4 ohms, 2000W x 1 @ 2 ohms, 4000W x 1 @ 1 ohm
• 1 Pair of Preamp Outputs
• Bass Boost 0-12 dB at 45 Hz
• Bass Knob Included
• Dimensions: 14-7/8"L x 9-1/16"W x 2-1/2"H

25% off a 4 Gauge Amp Kit with Purchase

$139.95

IN STOCK

3400W Max Monoblock Class D Gorilla Series Car Amplifier

• RMS: 1000W x 1 @ 4 ohms, 1400W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 3400W
• Class D Circuitry
• Bass Boost 0-12 dB
• 1 Pair of Preamp Outputs
• Dimensions: 9-1/10"W x 12"L x 2-3/10"H

$109.99

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

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

50% off Belva BBSW167 16 ga. Speaker Wire with purchase!

$67.15

IN STOCK

5000W MAX Class D Single Channel Monoblock Chaos Exxtreme Series Amplifier

• RMS Power: 2000W x 1 @ 4 ohms
• Peak Power: 3500W x 1 @ 2 ohms, 5000W x 1 @ 1 ohms
• Class D Circuitry
• Bass Boost 0-18 dB at 50 Hz
• Speaker Level Inputs
• Dimensions: 11"W x 20-11/16"L x 2-7/8"H

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

$129.95

IN STOCK

1000W Class D 1-Channel Monoblock Reference Series Amplifier

• Peak: 475W x 1 @ 4 ohms, 750W x 1 @ 2 ohms, 1000W x 1 @ 1 ohm
• Total Peak Power: 1000W
• Built-In System Diagnostics
• Variable Bass EQ: 0 to +10 dB at 45 Hz
• Class D Circuitry
• Dimensions: 8-5/16"W x 15-1/2"D x 2-3/8"H

$139.99

IN STOCK

650W RMS Single-Channel Monoblock iON Series Class D Full-Range Digital Stereo Bridgeable Amplifier

• RMS: 400 x 1 @ 4 ohms, 650W x 1 @ 2 ohms
• Total RMS Power: 650W
• Class D Circuitry
• Bass Boost: 0 - 12 dB at 45 Hz
• Wired Bass Remote Included
• Dimensions: 5-5/16"W x 9"L x 1-11/16"H

25% off a 4 Gauge Amp Kit with Purchase

$119.99

IN STOCK

2000W Max Digital Monoblock TNT Series Car Amplifier with High Level Inputs

• RMS: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms
• Total Peak Power: 2000W
• Wired Bass Remote Included
• Bass Boost: 0-10 dB
• Class D Stealth Design
• Dimensions: 11"D x 9-3/4"W x 2-1/4"H

$129.95

IN STOCK

4000W Max Class D Monoblock BAMF Series Amplifier

• RMS: 1200W x 1 @ 4 ohms, 1700W x 1 @ 2 ohms, 2200W x 1 chan @ 1 ohm
• Total Peak Power: 4000W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 1 Pair of Preamp Outputs
• Dimensions: 13-3/4"L x 8-1/4"W x 2-1/8"H

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

$189.95

IN STOCK

1500W Class D 1-Channel Monoblock Reference Series Amplifier

• Peak: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms, 1500W x 1 @ 1 ohm
• Total Peak Power: 1500W
• Built-In System Diagnostics
• Variable Bass EQ: 0 to +10 dB at 45 Hz
• Class D Circuitry
• Dimensions: 8-5/16"W x 15-3/4"D x 2-3/8"H

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

$154.99

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

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

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

$139.99

IN STOCK

1000W RMS, Rubicon Series Class D Monoblock Amplifier

Rubicon Series Monoblock Car Amplifier • 600 watts x 1 chan @ 4 Ohms • 800 watts x 1 chan @ 2 Ohms • MOSFET Power Supply • LED Protection Indicator • SMT Built In Cooling Fan • Aluminum Alloy Heatsink

25% off a Soundstream 1.5 Farad Capacitor with LED Display

$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

2000W Class D 1-Channel Monoblock Reference Series Amplifier

• Peak: 650W x 1 @ 4 ohms, 1300W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm
• Total Peak Power: 4000W
• Built-In System Diagnostics
• Variable Bass EQ: 0 to +10 dB at 45 Hz
• Class D Circuitry
• Dimensions: 8-5/16"W x 20-1/2"D x 2-3/8"H

50% off a 0/1 Gauge Amp Kit with Select Amplifiers!

$199.99

IN STOCK

2500W Max Anarchy Series Monoblock Power Amplifier

• RMS: 1800W x 1 @ 4 ohms
• Peak: 2500W x 1 @ 2 ohms
• Illuminated Logo
• Bass Boost 0-18 dB
• Chrome-Plated Connections
• Dimensions: 14"L x 10"W x 2-3/16"H

25% off a 4 Gauge Amp Kit with Purchase

$93.25

IN STOCK

1500W Max Monoblock Class D Zeus Series Car Amplifier

• Peak: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms, 1500W x 1 @ 1 ohm
• Total Peak Power: 1500W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 14-8/10"L x 10"W x 2-1/3"H

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

$139.99

IN STOCK

4000W Max Monoblock ARMOR Series Class D Car Amplifier

• RMS: 1600W x 1 @ 4 ohms
• Peak: 3000W x 1 @ 2 ohms, 4000W x 1 @ 1 ohm
• Strappable Peak: 8000W x 1 @ 2 ohms
• Bass Boost 0-12 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 14-1/3"W x 5"D x 2-8/10"H

25% off a 4 Gauge Amp Kit with Purchase

$109.95

IN STOCK

Only 1 Left!

3800W MAX Class D Single Channel Monoblock Chaos Exxtreme Series Amplifier

• RMS: 1600W x 1 @ 4 ohms
• Peak: 2600W x 1 @ 2 ohms, 3800W x 1 @ 1 ohms
• Class D Circuitry
• Bass Boost 0-18 dB at 50 Hz
• Speaker Level Inputs
• Dimensions: 11"W x 14-15/16"L x 2-7/8"H

$99.99

IN STOCK

1000W Max, Monoblock Gothic Series Class AB Car Amplifier

• RMS: 375W x 1 @ 4 ohms, 470W x 1 @ 2 ohms
• Total Peak Power: 1000W
• 1 Pair of Preamp Outputs
• Bass Boost: 0-18 dB
• Low Pass Filter: 40-150 Hz
• Dimensions: 9"L x 9-3/4"W x 2-3/10"H

25% off a 4 Gauge Amp Kit with Purchase

$79.95

IN STOCK

1000W Monoblock Ground Pounder Class A/B Amplifier

• RMS Power: 500W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms
• Variable Bass Boost
• Total Peak Power: 1000W
• 9.05"W x 13.93"L x 2.29"H

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

$79.99

IN STOCK

Only 3 Left!

3500W Max, Onyx Series Class D Monoblock Power Amplifier with Remote Level Control

Onyx Series Monoblock Class D Car Amplifier • 1500W x 1 Chan. @ 4 ohms • 3500W Max • MOSFET PWM Power supply • Variable gain controls • Phase Shift Selector • Black Heatsink • Variable Subsonic and low-pass filter

$89.99

IN STOCK

900W RMS Class AB Single Channel Monoblock Chaos Exxtreme Series Amplifier

• RMS: 700W x 1 @ 4 ohms, 900W x 1 @ 2 ohms
• Total Peak Power: 1800W
• Wired Bass Remote Included
• Bass Boost 0-18 dB at 50 Hz
• Speaker Level Inputs
• Dimensions: 11"W x 13-3/4"L x 2-7/8"H

25% off a 4 Gauge Amp Kit with Purchase

$64.95

IN STOCK

Only 2 Left!

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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.