Massive Audio SUMMO 84

8" 600W Dual 4 Ohm Car Audio Subwoofer

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List price $169.95

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$85.99

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Massive Audio Store

General Features:

  • 8" Dual 4 ohm Summo Series Subwoofer
  • Power Handling:
    • Peak: 600 watts
    • RMS: 300 watts
  • Kevlar fiber enhanced non-pressed paper cone
  • EROM foam surround with red stitching
  • 2" 4-layer hi-temp voice coil
  • Fiberglass woven dust cap
  • 16 Gauge power cable with direct lead connection
  • Double stacked 120oz high energy magnets
  • Top-mount depth: 5.04"
  • Sensitivity: 91.36dB
  • 1-year Sonic Electronix Warranty

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Summo (Massive Audio)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
8"
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.
600 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.
300 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Dual
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.
4 ohms
Voice Coil Diameter
Diameter of voice coil, usually measured in inches.
2"
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".
91.36 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
10 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Black
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.
Non-Pressed Paper
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Foam
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Double Stacked

Recommended Enclosure Specifications

Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.42 cubic feet
Optimum Sealed Box Volume
This value indicates the ideal sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.75 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.50 cubic feet
Optimum Ported Box Volume
This value indicates the ideal ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.75 cubic feet
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.
5.04"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
7.24"

Electromechanical Parameters

Free-Air Resonance (Fs)
The free-air resonance frequency of the subwoofer, measured in Hz. At this frequency the weight of the moving parts is perfectly balanced with the subwoofers suspension system.
37.85 Hz
Equivalent Compliance (Vas)
This is the amount of air that has the same stiffness as the subwoofers suspension. The greater the rating, the lower the stiffness and larger recommended enclosure. It is measured in Liters.
15.12 liters
Total Speaker Q Value (Qts)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including all dimensionless losses. Essentially, a high Qts value (closer to 1.0) means the subwoofer is great for sealed enclosures and a low Qts value (closer to 0) means the woofer is great in vented enclosures. A Qts of around 0.45 means the woofer will work decently in either enclosure type.
0.399
Electrical Q Value (Qes)
The subwoofers relative damping (Q) at the resonance frequency (Fs), including electrical losses. Also called the mechanical damping of the subwoofer. The unitless measurement usually varies from 0.5 – 10.
0.449

What is in the box?

WITB: Subwoofers
A detailed list of the equipment (main product and accessories) included with your subwoofer. If special accessories are included in the box, they will be listed and detailed below the main list of equipment.
Paperwork
Paperwork included with the product.
Other Accessory #1
Standard accessories are included in the main list above; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #2
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #3
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #4
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.
Other Accessory #5
Standard accessories are included in the list above special accessories; however, this line provides specific details on an additional, unique accessory that is included with the product.

Specials with this Item

Promotions
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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
100%
4 Star
0%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.8
Design
4.6
Usability
5.0
XS2500

Hattiesburg, MS

Overall
Durability
Value
Features
Design
Usability
Awesome Sub

February 10, 2014

Running one of these in a 1.3 cubic foot ported enclosure with about 650 watts RMS running to it and it hammers. Output is comparable to a 12. Amazing bang for the buck.

22 of 27 found this helpful

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Kiley

Hattiesburg, MS

Overall
Durability
Value
Features
Design
Usability
Ridiculous sub!

April 2, 2014

Built a .75 cubic foot vented enclosure for this beast and ran roughly 650watts rms to it and it absolutely hammers! Output could easily be compared to a 12".

19 of 23 found this helpful

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Pam

,

Overall
Durability
Value
Features
Design
Usability
beast of a 8 inch

November 11, 2015

this Is not your everyday 8 inch subwoofer. It has the output of a 12 the weight of a 8 and is compact best 8 inch ever

2 of 2 found this helpful

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Darryl

Lancaster, Ohio

Overall
Durability
Value
Features
Design
Usability
Amazing sub

February 27, 2017

This sub is a killer deal. Takes barely any space, hits hard, hits deep(for an 8) and sounds tight. I've had 12s, 10s, and now this 8 and I can definitely say I'm impressed with the quality.

0 of 0 found this helpful

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Craig

Panama City, FL

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Awesome

December 24, 2015

I have 2 of these in a ported box and I must say I am very satisfied. I'm used to running bigger subs but I wanted some space back in my car. These perform better than any larger sub I've owned and make my rear view mirror useless. Friends have even questioned if I'm really only running 8s and then I show them. Super fast shipping from Sonic also.

0 of 0 found this helpful

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $36.99

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Stinger Sound Dampening Trunk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for your whole trunk!

Your Price $64.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

Five Piece Installer Panel Removal Tool Kit

Installer's Panel Removal Installation Tool Kit for Car Stereo, Speakers and Car Audio Installs

Your Price $11.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $8.99

Spring Post Terminal Cup

Makes adding a spring post terminal to an enclosure simple! Banana clip ready!

Your Price $3.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $33.95

1 Massive Audio SUMMO 84 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Massive Audio SUMMO 84 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

3 Massive Audio SUMMO 84 Subwoofers

Mono Amp

4 Channel Amp

4 Massive Audio SUMMO 84 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Browse 1 question and 2 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Im installing two of theses in a s10 truck and they had the right mounting depth for the box that I can build.
David L on Feb 25, 2015
because its all about the bass, bout the bass, no treble
Dante N on Dec 1, 2014

Product Summary

Manufacturer

Model Number

SUMMO 84

UPC

623169610714

Weight

12.50lbs

Internal SKU

summo84

Internal Product ID

74657

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: Massive Audio SUMMO 84

  • Dalek Massive @ Massive Audio Booth | CES 2014
  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?

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Massive Audio SUMMO 84

8" 600W Dual 4 Ohm Car Audio Subwoofer

$85.99

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NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

$39.99

Add
20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

$59.99

Add
2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

$7.99

Add

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