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JL Audio 4-Channel Amplifier plus 50% OFF a Set of Four JBL 6-1/2" Speakers

JL Audio HX280/4 280W 4-channel Class D Full-Range Amplifier + JBL GTO628 360W Max 6-1/2" 2-Way Grand Touring (GTO) Series Coaxial Speakers

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JL Audio 4-Channel Amplifier plus 50% OFF a Set of Four JBL 6-1/2" Speakers

JL Audio HX280/4 280W 4-channel Class D Full-Range Amplifier + JBL GTO628 360W Max 6-1/2" 2-Way Grand Touring (GTO) Series Coaxial Speakers

$262.97

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JBL GTO628

360W Max 6-1/2" / 6-3/4" 2-Way Grand Touring (GTO) Series Coaxial Speakers with 1" My-Ti Tweeters, Plus One Woofer Cone & 2-ohms Impedance
Quantity: 2 (Two Pairs, Four Speakers Total)

JBL GTO939

General Features:

  • 6-1/2" (also fits 6-3/4") Grand Touring Series 2-way Car Speakers
  • Power Handling:
    • Peak: 720 watts per set / 180 watts each
    • RMS: 240 watts per set / 60 watts each
  • Recommended Power Range: 10 - 75 watts RMS per channel
  • Low-Q woofer design
  • Patented Plus One® polypropylene cone material
  • 1" High-bandwidth, edge-driven Mylar-titanium dome tweeter
    • UniPivot™ rotating tweeter, rotates nearly 360 degrees
    • 0 / +3dB level adjustment
  • On-board crossover network
  • Intermount III (patent no. 6,505,705) mounting system included
  • Frequency response: 50 - 21,000 Hz
  • 2 ohms impedance
  • Sensitivity: 92 dB
  • Top-mount depth: 2-1/16"
  • Tweeter height: 13/16"
  • Cutout dimensions: 5-1/4"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Priced Per Set of Four

JL Audio HX280/4

280W 4-channel Class D Full-Range Amplifier
Quantity: 1


 

General Features:

  • Monoblock Class D Full Range Amplifier
  • RMS Power Rating @ 14.4 V:
    • 4 ohms: 50 watts x 4 chan.

    •  
    • 2 ohms: 70 watts x 4 chan.
    • Bridged 4 ohms: 140 watts x 2 chan.
  • RMS Power Rating @ 12.5 V:
    • 4 ohms: 36 watts x 4 chan.
    • 2 ohms: 52 watts x 4 chan.
    • Bridged 4 ohms: 100 watts x 2 chan.
  • NexD™ ultra-high-speed switching design
  • Black powder-coated finish
  • Gasketed cover for the controls
  • Stainless steel hardware for durability
  • LED power (green) and protect (red) indicators
  • Accepts RCA (low-level) & Speaker-level (high-level) signal
  • Switchable Input sensitivity: 250 mV-4 V (Low) to 750 mV-15 V (High)

  •  
  • Channel Input Mode Switch: 2 / 3 / 4
  • Switchable filter modes: Low-Pass / High-Pass
  • Variable filter: 35 - 300 Hz, 12 dB/octave
  • Frequency Response: 20 - 20,000 Hz
  • Total Harmonic Distortion (THD): <1.0%
  • Signal to Noise Ration: 89.5 dB
  • Damping Factor: >60
  • Fuse Rating: 35A x 1
  • Dimensions: 8.66"W x 3.09"D x 1.77"H
  • 8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty


  • Check out the JL Audio HX280/4 Owner's Manual

    Front Speaker Specifications

    Speaker Size
    Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
    6-1/2" (also mounts in 6-3/4" w/ included brackets)
    Design
    The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
    2-way
    Shallow Mount Installation
    This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

    Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

    Yes
    Tweeter Design
    Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
    Dome
    Tweeter Composition
    Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

    PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

    Mylar/Titanium Hybrid
    Woofer Composition
    Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
    Plus One
    Peak Power Handling
    Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
    180 watts
    RMS Power Handling
    The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
    60 watts
    Sensitivity
    An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
     
    Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
    92 dB
    Frequency Response
    The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
    50 - 21,000 Hz
    Impedance (Per Voice Coil)
    The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
    2 ohms
    Top-Mount Depth
    The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
    2-1/16"
    Speaker Grilles
    A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
    Yes

    Rear Speaker Specifications

    Speaker Size (Rear)

    Refers to the size of the speaker.

    Every vehicle has standard application sizes. Please contact us for your vehicle's specific speaker sizes if you do not know them.

    6-1/2" (also mounts in 6-3/4" with included brackets)
    Design
    The number of individual drivers in a car speaker. Speakers with 2 drivers are known as 2-way, 3 drivers = 3-way and so forth. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer (main driver) and the tweeter. Center channel speakers are great for those looking to capture true surround sound in their car.
    2-way
    Shallow Mount Installation
    This means that the speaker is designed to be installed in areas that do not have a lot of space. Shallow mount speakers will typically have a mounting depth of less than 2".
    Yes
    Tweeter Design
    Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Read below for a description of each and other designs.

    Cone tweeters are simple, efficient and typically are the most reasonably priced.

    Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound.

    Semi-dome design is one with a dome placed inside a cone.

    A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver.

    An "EMIT" tweeter was introduced by industry leader Infinity. "EMIT" is the acronym for Electro Magnetic Induction Tweeter. They are a thin piece of plastic material with an etched voice coil on the surface of them suspended between 2 very powerful Samarium Cobalt magnets. This design is the key to the EMIT tweeters super fast, crystal clear high end sound.

    A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.

    Dome
    Tweeter Composition
    Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as aluminum, titanium, Mylar, and other materials.

    PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

    PEN is an acronym for the space age material "biaxially oriented polypropylene naphthalate film".

    Mylar/Titanium Hybrid
    Woofer Composition
    The woofer cone material is essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene: thermoplastic plastics or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speaker manufacture.
    Plus One
    Peak Power Handling
    Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
    180 watts
    RMS Power Handling
    The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
    60 watts
    Sensitivity
    An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.

    Efficiency (1W/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other subwoofers to determine which one is "louder".
    92 dB
    Frequency Response
    The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
    50 - 21,000 Hz
    Impedance (per voice coil)
    The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit you/your amp best.
    2 ohms
    Top Mount Depth
    The depth when installed on top of the mounting surface. Measured from the bottom of speaker(magnet) to the bottom of mounting holes on rim of speaker.(Most common application)
    2-1/16"
    Speaker Grilles
    If yes, then package of speakers includes matching speaker grilles. If no, then there are no grilles or included. If optional, then we most likely will also have an optional set of grilles that can be purchased separately.
    Yes

    Amplifier Power Specifications

    RMS Power @ 4 ohms

    The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

    If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

    50 watts x 4 channels
    RMS Power @ 2 ohms

    The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

    If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

    70 watts x 4 channels
    Bridged RMS Power

    Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

    Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

    140 watts x 2 channels

    Amplifier Specifications

    Amplifier Class

    An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

    Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

    Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

    Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

    D
    Number of Channels
    Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
    4
    Total RMS Power Output
    Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

    RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

    The RMS output figure is much more accurate than the peak rating when comparing products.

    280 watts
    Maximum Input Gauge Size
    This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
    8 AWG
    Minimum Impedance Unbridged
    The lowest impedance the amplifier will handle when it is not bridged.
    2 ohms
    Minimum Impedance Bridged
    The lowest impedance the amplifier will handle when it is bridged.
    4 ohms
    THD at Rated RMS Power
    The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
    <1.0%
    Speaker Level Inputs
    Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
    Yes
    Preamp Outputs
    Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
    No
    Built-in Crossover

    A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

    When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

    Low-Pass (LP)
    High-Pass (HP)
    High-Pass Crossover Frequency
    The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

    The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

    35 - 300 Hz
    Low-Pass Crossover Frequency
    The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

    The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

    35 - 300 Hz
    Signal-to-Noise Ratio
    This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
    89.5 dB
    Bass/Gain Remote
    If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
    No
    Fuse Rating
    The amperage and the number of fuse(s) an amp requires.
    35A x 1 

    Warranty and Return Policy

    Parts Warranty Duration
    1 year
    Labor Warranty Duration
    1 year
    Warranty Provider
    Manufacturer

    Summary of Customer Ratings & Reviews

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    Product Summary

    Manufacturer

    Model Number

    2-GTO628_HX280/4

    Weight

    17.00lbs

    Internal SKU

    2-gto628_hx2804

    Internal Product ID

    106319

    Sonic Electronix Wiring Guide

    Wiring Diagram Legend

    Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

    Product Name: JL Audio 4-Channel Amplifier plus 50% OFF a Set of Four JBL 6-1/2" Speakers

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