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Clarion SW1251

12" Single 4 ohm Subwoofer

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Clarion SW1251

12" Single 4 ohm Subwoofer

$35.99

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  • 12" SW Series Single 4 ohm Subwoofer
  • Power Handling:
    • Peak: 700 watts
    • RMS: 250 watts
  • Single 4 Ohm Heat Resistant Voice Coil
  • Polypropylene Electronic Spun Aluminum Dust Cap
  • Fiber Glass / Paper Cone Design
  • Nitrile Butadiene Rubber High Excursion Surround
  • Dual Strontium Ferrite Magnets
  • Hyper Extended Vented Pole Piece
  • Spider Exhaust Technology (SET) Cooling
  • Dual Gold Plated Terminal Blocks
  • Linear Cotton Spider with Integrated Tinsel Leads
  • Custom Stamped Steel Powder Coated Chassis
  • 1-year SonicElectronix.com warranty

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
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.
700 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.
250 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.
Single
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.
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).
30 - 1,000 Hz
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".
89.6 dB
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.
Dark Gray
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.
Woven Glass Fiber
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.
Rubber
Magnet Structure
Defines the overall structure of the subwoofers magnet.
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
No
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Sealed
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.
.90 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.
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
.90 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.
1.10 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.
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.10 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.
6.5"
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.
11.31"
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.

No

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.
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.
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.
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.
Electrical Resistance of Voice Coil (Re)
Amount of DC resistance of the subwoofer when measured with an ohm meter. Typically, this will read less than the impedance rating of the subwoofer.
Mechanical Q Value (Qms)
This is the subwoofers relative damping (Q) at the resonance frequency (Fs), including mechanical losses. Also called the mechanical damping of the subwoofer. This unitless measurement usually varies from 0.5 – 10.
Efficiency Bandwidth Product (EBP)
This number represents the trade off between having an efficient woofer and one with a wide bandwidth. To calculate this number, take the Fs and divide it by the Qes. If the number is below 50, the woofer is designed for a sealed enclosure only. If it's between 50-100 it can be used in either. Lastly, if it's greater than 100 it's designed for vented enclosures.

Specials with this Item

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Warranty and Return Policy

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
83%
4 Star
17%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.2
Design
4.3
Usability
4.8
wendell

GonzalesGonzales, LA

Overall
Durability
Value
Features
Design
Usability
clarion- best dollar for dollar sub

October 24, 2008

clarion does not play around i have two of these in my ford ranger in a dual ported box, and they slam. This sub is one of the best dollar for dollar sub you get the best bang for your buck!

5 of 6 found this helpful

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Mike

Canada

Overall
Durability
Value
Features
Design
Usability
Pretty Decent For The Price

September 13, 2009

I Bought four of these and only have three of them in a box because I could only afford a box that fit three and it still knocks i got three of those and 2 other twelves and two 10s plus my two 10inch mid range and 6 tweeters and after market 6x9s in the back. all in my ford windstar. soon enough im gonna build one big box to fit in the back of the van and put all my subs in it and itll bang pretty good. i only got two amps. one for the highs and one for the lows so im going to have to by another amp. and itll deff be from here

3 of 4 found this helpful

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kris

Coshocton, OH

Overall
Durability
Value
Features
Design
Usability
gooooood

December 4, 2007

i justgot 2 of these from here. they pound pretty good escpecially for 37ish bucks i have 2 in a sealed box, ran from a 1000W panasonic 4 channel amp both bridged they rock out, i like heavy metal but they pound with anything, i listen to more rap then i ever have, they are sweet!

3 of 4 found this helpful

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jeresara

palmdale,ca

Overall
Durability
Value
Features
Design
Usability
idk

January 22, 2010

this sub is good.....i have a three 12 box in my trunk and 2 of them are pioneers....the clarion stand out very nicely......good stuff sonic...i will have much more things to buy...=D

2 of 3 found this helpful

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Pistol

Orlando, Fl/ Harrison, Ar

Overall
Durability
Value
Features
Design
Usability
150+ DB

December 25, 2009

I bought 8 of these subs for a wall build. I had all 8 in a pac man style wall center port tuned to 33Hz powered by 2 Audiopipe 1500Ds and did a 149.x with stock battery. I later installed 2 Kinetik HC1800s and 2 runs of 0ga and did a 152.4 on the dash on TL with driver window down. They are the best bang for the buck sub on the planet!

2 of 3 found this helpful

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ju5t1f13d

Ashland, OH

Overall
Durability
Value
Features
Design
Usability
great sub great value

June 10, 2009

i bought 2 of these subs locally then later found sonicelectronix and to see them on here for about half of the price!!!!!! needless to say i only shop at sonicelectronix for my car audio needs! great value and they are amazing subs. they have been pounding for 2 years now and they do not fail to please me i would highly recommend these subs

1 of 2 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 $37.85

Belva 23 ft. of 12 Gauge Speaker Wire

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Your Price $94.95

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

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Your Price $18.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $74.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $7.99

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.

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Universal 12" Subwoofer Grille

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Universal 12" Subwoofer Grille

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Scosche SPL Meter

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1 Clarion SW1251 Subwoofer

Mono Amp

2 Channel Amp - Bridged

2 Clarion SW1251 Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp - Bridged

3 Clarion SW1251 Subwoofers

4 Channel Amp

4 Clarion SW1251 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

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Product Summary

Manufacturer

Model Number

SW1251

UPC

729218015735

Weight

13.00lbs

Internal SKU

sw1251

Internal Product ID

9044

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: Clarion SW1251