This is one of Pioneer’s better SINGLE DIN in-dash radios. It features a standard AM/FM Tuner along with Bluetooth, Dual Phone Pairing, an LCD Display, HD Radio, Pandora Support, MIXTRAX and also plays those ancient things called Compact Discs.
Bluetooth is extremely easy to connect. It allows you to safely talk on the phone while driving with hands free calling, gives you access to your phonebook, and the ability to also stream music from your mobile device directly to the radio.
The X8700BH’s MIXTRAX feature creates a non-stop playlist of the music from your mobile device to turn those long drives into a party.
Color illumination can be selected from the settings menu with several options. Choose the color that best matches your dashboard or mood, or simply choose “SCAN” to continuously cycle through each one.
The left side of the radio features a “PHONE CALL” button to make or answer a call, a BAND button to cycle the menus and a POWER button.
The Multi-Control Dial is easy to use and allows you to both SEEK through music tracks or radio stations and adjust the VOLUME.
To prevent theft, Pioneer has designed the X8700BH face-plate to be detachable. Simply release it from the housing and take with you wherever you go.
Lets move to all the connections in the back. First, there are two Pigtails, one for the external microphone and the other for AM/FM and HD Radio. A USB input allows you to connect an iPod to the radio to play music and charge your device. The wiring harness plugs in here to connect power, ground and speakers. There are two 3.5mm AUXILIARY inputs and finally there are 3 sets of 4 volt RCA Outputs for running external amplifiers.
In The Box
Along with the radio, the box includes a wiring harness, a USB extension cable, an external microphone that runs 13 feet, a wireless remote control and mounting hardware.
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Be sure to check out DEH-X8700BH Online at QualityMobileVideo.com and by calling us at 800-363-0096
The Power Acoustik PTID-8290B is a great radio for anyone who can only fit a single-din radio in their car, but really want that large screen display that is usually associated with double-din radios. When you first power the 8920B up, the LCD is display completely hidden inside the radio. When you press the “OPEN” button on the right, the motors kick in and the LCD Display slides out and tilts up. The radio also allows you to adjust the tilt angle of the monitor to your personal preference.
Bluetooth gives you full control over your phone, allowing you to make and receive calls and even go through your phonebook. Hands Free Calling allows you to drive safely while talking on the phone. Bluetooth also gives you the ability to stream music from your mobile device to the radio.
A great feature that makes this radio fun for passengers is its ability to play DVDs! Simply insert your DVD and get to watching. The wireless remote control gives you full control over all radio and DVD functions.
The front of the radio features two audio inputs. One is a USB input, to easily connect an iPod to the radio. The other is a 3.5mm Auxiliary input for other audio devices.
The 8920B also has an SD Memory Card slot and can play MP3, MP4, DivX, and JPEGS! Release the front panel from the housing and insert a card into the slot. Once the front is attached again you can play your media.
To start the PTID-8920B has 5 Channel RCA Outputs, and one for an optional backup camera. Next is a Wiring Harness input. Attached to the radio is a Subwoofer output and a Radio Antenna.
In the Box
Included in the box is the wiring harness, a wireless remote control to control all functions, and mounting hardware.
In today’s line up battle we will be going over three kick ass Kenwood touchscreen radios. The DDX272, the DDX372BT and the DDX672BH.
The three feature built in DVD/CD players, responsive touchscreens, RDS AM/FM Radio tuners, and are Sirius XM ready. All three provide rear USB connections, and have a backup camera input. These multimedia car radio’s play everything from DVDs, CDs, JPEGs, MP3s to MOV files from both USB and DVD.
To start the battle our first contender is the DDX272. It brings a 6.2 inch touchscreen with an integrated DVD slot. The RDS AM/FM tuner has 24 preset memory. The DVD player will prevent watching as you are driving unless you opt to disable this feature.
The built equalizer allows you to adjust the sound to suit your music and listening taste. To match your factory dash the illumination color can be matched with near infinite possibilities. The rotary volume control makes adjusting volume easy and quick. The AV-RCam button gives you direct access to your back up camera or phone apps.
The back reveals all the connections. Starting with the wiring harness which powers the radio and provides speaker level outputs, a USB cable to connect an iPod or thumb drive, The DDX272 has a single 3.5mm audio video input. The 6 channel pre-amp outs provide 4 volts for lower noise and easier integration. The Sirius satellite radio input provides a connection to a Sirius connect SXV300 satellite radio tuner.
To take our battle to the next level, we have the DDX372BT. The 372 adds Bluetooth for both streaming and phone calls. Like the DDX272 the 372 has a 6.2 inch LCD touchscreen with integrated DVD slot. With the direct touchscreen controls you can access any audio video input immediately. The DDX372BT adds the direct Bluetooth button for hands-free phone calls or to quickly pair your phone. The 372BT has access to you phonebook and you can also manually dial any number you need. The external microphone ensures excellent audio quality for your callers.
Bluetooth supports audio streaming from your music library or your favorite music app. Direct connecting your phone through USB provides greater sound quality and charges your phone while its being used.
Like the DDX272 the DDX372BT has the rotary volume control and immediate access to your back up camera. The 372 adds immdiate access to your phone and apps.
Moving to the back. The wiring harness which powers the radio and provides speaker level outputs, a USB cable to connect an iPod or thumb drive, The DDX372BT has a single 3.5mm audio video input. It too has 6 channel pre-amp outs providing 4 volts for excellent noise rejection. The external microphone input is added to the 372BT in addition to the standard Sirius satellite radio input.
Next up the big dog! The Kenwood DDX672BH! The 672 steps up the screen size to 6.95 inches and has a motorized face plate with bottom mounted controls. The DVD/CD player slot is located behind the motorized display and supports most digital formats with the exception of MP4. The 672 introduces us to HD radio and for cd sound quality from your favorite radio stations.
The 672 has integrated Bluetooth for hands free calling and streaming audio. The simple one touch pairing is quick and supports Pandora wirelessly. The external microphone ensure excellent call quality and makes for optimal placement.
The rear layout is virtually identical to the DDX372BT. It features a single 3.5mm audio video input. Microphone input for the included external microphone. Like the 272 and 372 it has 6 channel outputs at 4 volts for excellent sound quality and minimal noise. The USB supports direct iPhone connection and USB thumb drives. The USB supports most digital media types with the exception of MP4 but does play DivX.
All three radios include a double DIN trim plate, radio cage, pull keys, and mounting hardware.
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That’s it for today’s line up battle. Hopefully this helps you decide which one is for you. Leave your questions below. You know what to do like or dislike this video, subscribe to our channel, and visit qualitymobilevideo.com to get yours today. See you again next time!
In response to our blog post Subwoofer Impedance and amplifier output we filmed a video on some of the concepts contained in that post. As we showed in our subwoofer wiring diagrams you can present the amplifier with many different loads depending on how many voice coils and the impedance of those voice coils.
In the next segment we show you how to wire the Pioneer TS-SW2002D2 subwoofers as either an 8 ohm or 1 ohm load. By creating a 1 ohm load this makes them optimized from most class D mono subwoofer amplifiers.
We show you how to wire two 8 inch subwoofers with dual 2 ohm voice coils to create an 8 ohm and 2 ohm load. We also show you how to check your subwoofer impedance. Please leave your comments and questions below.
It is rather enjoyable to listen to music while driving your vehicle. But bad sounding tunes isn’t fun, instead of using your stock stereo and amplifier it’s better that you install a new amplifier to power up your speakers or subwoofer. Aftermarket speakers and factory speaker benefit greatly from additional power. The question is – Where do you start once you purchased your car amplifier?
Amplifier Installation Know How
First, you need to find a suitable location for your newly bought amplifier. We suggest you place the amplifier underneath the seat or in a cargo area. Dissapation of heat is improtant and should be considered when mounting an amplifier.
For the amplifier’s wiring, you should consider buying the proper gauge power cable, a shielded RCA signal cable, 3 feet of ground cable that has the same thickness as the power cable, a ‘remote on’ wire, and a 12-16 gauge speaker wire for the main speakers.
Next, you’ll need to get your tools ready for the job at hand. This would include things like:
Before you get started you will need to determine if you are going to use a line output converter or if you are making a direct connection to the aftermarket car stereo. Once you have determined where you are going to get your audio signal you may need instructions for taking of your vehicle’s dashboard apart. In actual fact, you should only remove the head unit of your vehicle’s dashboard as it is needed for hooking the the remote turn on and RCA cables.
With that out of the way, it is time for installing your amplifier. For your safety please ensure that nothing is connected to an electric current before you start.
Steps for installing the amplifier:
You will start by disconnecting your vehicle’s negative cable from the battery.
Then take the positive (red) power cable and attach it to the battery terminal on the positive side of your vehicle’s battery. Within 18 inches of the main battery connection you will install a fuse holder. The fuse is designed to protect the wire from melting and causing a fire if a short occurs.
Now its simply a case of running the power cable through the vehicle’s firewall and to the amplifier. Care should be taken as to where run the wire. Do not run the power cables too close to speaker signal or wires.
From here, you need make use of a metal screw or stud in order to connect the negative or ground cable. It’s important ensure the distance is not more than 3 feet as this could cause issues.
Next, you will unscrew the bolt, clean the surface using sandpaper or a wire brush. Use a ring terminal to attach the ground wire, then fasten the screw or stud again. We recommend using a factory ground point and not a screw.
Now you simply need to run the RCA cables down the opposite side of the vehicle to prevent noise. You’ll connect the RCA cables to a line output converter or to an aftermarket car stereo and to the amplifier.
The next connection is the remote turn-on This connection is used to turn on the amplifier. This connection is easily made to an aftermarket stereo. If using a factory radio you will need to locate a circuit that has 12 volts when the key is in accessory position.
The wire is typically run with the power wire to the radio location.
From there you will need to run your speaker wires. We recommend that you crimp-on female spade connectors for every connection as this prevent stray strands of wire and shorts.
Before you close everything up
Before putting everything back together we recommend that you you go through your checklist to ensure that everything is in working order.
There you have it. Your amplifier is installed and ready to use.
Last week we showed you a complete Pioneer audio system for under $400. This week we are going to talk all about the BASS.
Let’s get started
Rockford Fosgate is known by all bass heads for their relentless hard hitting bass. Rockford has one of the largest line-ups of subwoofers with three different lines. Within those lines there are 3 performance levels. Prime, Punch, and Power are all performance subwoofers and push the envelope with their output.
Rockford Fosgate Prime subwoofers
For those getting started in car audio or for those looking for a little fuller sound we have the Prime series. These entry level woofers are available in the R1 and R2 series in both 10 inch and 12 inch models. R1’s are the least expensive way to get some low-end notes in your ride.
The R2’s are available in shallow and regular mount. They are a step up from the R1’s with their better power handling and more flexible wiring options thanks to their dual voice coil design.
Punch P1 subwoofers
For those looking for some serious bass, Rockford has the Punch series. Punch subwoofers are available in P1, P2, and P3 performance lines. The P1 is the introduction to the Punch line-up. The P1’s are available in 8, 10, 12, and 15 inch. The P1 introduces a linear spider with embedded 16 gauge tinsel leads and are only available in single voice coil. The Kevlar fiber paper cone is extremely rigid and delivers the bass you expect from a Punch series woofer.
Punch P2 subwoofers
The P2 takes all of the P1 features and pushes the envelope even further. The P2 brings added flexibility with its dual voice coil design. The P2 also has a considerably larger motor structure…. The magnet size is increased nearly 40% and has a 2-1/2 inch voice-coil compared the P1’s 2 inch voice coil. The integrated spider and voice-coil venting is a standard feature of all Punch series subwoofers.
Punch P3 subwoofers
The P3 improves on the P2 and pushes subwoofer technology to the limit. The P3’s are available in 10, 12, and 15 models. Rockford has pushed the XMAX limit to nearly 16 millimeters! To get there, Rockford has yet again increased the magnet size by nearly 35% over the P2. The larger VAST surround allows for the increased excursion and adds up to 25% more cone area. The P2 adds an Anodized aluminum cone and dust cap for even more rigidity.
The P3 line-up adds shallow mount subwoofers in 8, 10, and 12 inch models. The shallow mount P3’s incorporate all of the P3 technology in a depth limited package. The M-roll surround allows for nearly 9 millimeters of XMAX and the dual linear spider keeps everything in alignment. The P3 shallow open up new possibilities in otherwise limited applications.
The P3 is the best performing Punch series subwoofer.
All Rockford Punch series woofers include trim rings and are compatible with optional Rockford grills. The trim rings provide a distinct look for a nice finished product.
Punch pre-loaded subwoofers
For those of us not interested in building a box or having one made.. Rockford has the entire Punch and Prime series subwoofers in pre-loaded enclosures. The Punch pre-loaded enclosures are available in P1, P2, and P3 performance levels and utilize the same drivers in 10 and 12 inch.. They are available in Single and dual driver configurations.
Be sure to check out our video on the Rockford fosgate prime subwoofers in pre-loaded enclosures below for more information on them.
Get your Rockford Fosgate subwoofers today at Quality Mobile Video with a 1 year warranty and 30 day returns. Thanks for watching and leave your comments below.
What’s up guys it’s Lorenzo with Quality Mobile Video and today we are going to show you a couple new things from Pioneer.
Where to start
Last week we showed you the Pioneer AppRadio 4 and we’re going to take it a step further rounding out a complete audio system. To start, we will be using a set of component speakers. Pioneer has just introduced their new components and they’re a step up from previous model in a couple of ways.
Pioneer opted to completely revamp the tweeter. The tweeter was made smaller to more easily fit door pillars, door sails, and factory door locations. The 1 inch tweeter is a soft dome, composite design and establishes a new philosophy for Pioneer called Open and Smooth. This new philosophy is meant to broaden the soundstage beyond the internal walls of your vehicle. The tweeter incorporates a larger rear chamber allowing it to play lower for better synergy with the woofer. The rounded over flange facilitates wider dispersion to create that enveloping sound.
The woofer is all new with it’s composite fibre cone. The cone is extremely rigid and light for high speed mid-bass with minimal distortion at any volume level. To accurately combine these new drivers, Pioneer has redesigned the crossover extensively. The new crossover utilizes high quality components in an easier to mount chassis. +3, -3 and 0db adjustments to the tweeter level, are easily made with the attenuation switch.
To round out the audio system we need a sub. Pioneer has updated their well known pre-loaded enclosures. The TS-SWX2502 uses their all new line of slim subwoofers. The high quality MDF enclosure is small enough to fit in a cargo area or behind seats. It’s wrapped in high quality black carpet and matches any vehicle. The 10 inch driver provides sufficient bass to round out an audio system in a truck or hatchback.
GM-D1004 4-Channel amplifier
To complete our audio system we need some power. To power our system we opted to use the amazing new pocket size amplifier, the Pioneer GM-D1004. Don’t let the small size fool you, this class FD amplifier packs a perfect punch for our small audio system. The four channel amp can be set up to run 45 watts to each of our stereo speakers and 90 watts bridged to our subwoofer. The amplifier is perfect for any audio system, it accepts speaker level and RCA level inputs. The audio sense turn on makes it perfect for OEM stereo upgrades where remote turn ons are not available. Class FD ensures that it runs cool and very efficiently making it perfect for mounting in hidden locations or behind panels.
Under $400 and is a nice upgrade from a factory system
This system can be added to any vehicle and all for under $400 bucks! I challenge you to find a better system for less, so get yours today at quality mobile video with 1 year warranty and 30 day returns. Thanks for watching and leave your comments below. See you again next week.
What’s up guys it’s Lorenzo with Quality Mobile Video and today we are going to talk about the Pioneer APP Radio 4! As you saw last week, Ray introduced the AVIC-8100NEX and the App Radio 4 takes many of the same features from Pioneer’s flagship model.
Awesome New Features:
The App Radio 4 has the same intuitive capacitance touch screen that responds to multi touch commands, pinch to zoom out, open to zoom in, and swipe commands! Pioneer has taken to opportunity of smart phone revolution, digital media and cheap storage and relegated the disc drive to the trash bin. Instead they have brought you the power of your phone to your car dash board. Like the Pioneer AVIC-8100NEX, the App Radio 4 adds Apple Car Play. That iPad mini you wanted in your dash is finally there! Car Play allows you to access your most common smart phone features without taking your eyes off the road. Car play leverages the power of Siri for texting and phone calls. Tell Siri who you want to call or have her respond to a text without ever taking your eyes off the road. You can easily access your phone book, recent calls, favorites, keypad and voicemail.
Your favorite music apps are right at your finger tips, no more fumbling for the phone to change that song. Access Spotify, Pandora, Rdio, and iTunes radio. Your playlists, album art, thumbs up, thumbs down are all right there.
For getting around town, the App radio 4 combines the power of Siri and Apple maps. Tell Siri that you need some morning coffee and she’ll find the closest shop to get your fix. Apple maps has real time traffic making it easy to avoid a bad situation. Non-Apple fans will love the Bluetooth streaming and phone support that the App Radio 4 has. Easily link up with your phone and play your favorite tunes or take phone calls without taking your eyes off the road. For Android users the App Radio 4 has mirror link and App radio mode, it doesn’t have support for Android auto that the 8100nex has, but mirror link makes using your Android phone pleasant.
A thing of beauty
The button-less glass front makes the App Radio 4 a nice addition and upgrade to any vehicle. The 6.2 inch screen is very bright and easily viewable in direct sunlight. Seamlessly integrate into existing vehicles with double din cutouts, full color matching button illumination and steering wheel control inputs.
Sound quality conscious listeners will love the support for FLAC audio files. The built in 13-band EQ allows you to fine tune your sound system and vehicle interior you’re your personal listening tastes. You can playback high-res 192 Kilohertz 24 bit audio files and it has support for full HD video files.
Inputs and Outputs
The App radio 4 has tons of inputs and outputs. You can easily add a rear view camera, rear video monitor with dual zone control, and auxiliary input! The (3) 4-volt RCA provide high quality and low noise outputs to external amplifiers. The SPH-DA120 App Radio 4 revolutionizes the driving experience with the power of your smart phone. Get your App radio at quality mobile video with 1 year warranty and 30 day returns, see you again next week. Leave your comments below.
In electrical circuits there are two concepts. These concepts have a mathematical relationship between them.
I’ll use plumbing terms as it is easier to visualize these concepts using a pipe. The first is the voltage, in plumbing terms, voltage is the size of the pipe. The other is current or flow, in plumbing terms this is the pressure. These two concepts define the work or wattage.
Ohms law: V= I x R
V = Voltage I = Current; measured in Milli-amps or Amps R = Resistance; measured in Ohms
Using this concept and amplifier that outputs 400 watts at 4 Ohms will output 800 watts at 2 Ohms.
Speakers or Sub-woofers
Sub-woofers and speakers have a voice-coil; it is the heart or the device that performs the work. A voice-coil is a tightly wound copper wire that when electricity is applied, generates a magnetic field that either attracts or repels a closely mounted magnet.
When electricity is is moved through this copper wire it does so with resistance (known as Impedance), this resistance is measured in Ohms. The lower a speakers impedance, the easier it is drive.
Amplifier output relationship to Impedance
Amplifiers have a sweet spot in their relationship to output and impedance. Problems arise when a sub-woofer has very low impedance or resistance. The output of an amplifier is measured in wattage or work, work has a byproduct called heat. Excessive heat causes and amplifier to shut down to protect itself from destruction. Heat is the largest factor in the life span of electronics.
Consideration must be taken to factor what an amplifier output is capable of and the load you are introducing. Manufacturers clearly state what their amplifiers are capable of in output and in what situations or configurations. Car audio amplifiers are capable of driving a 4 ohm load. 4 ohms is what most car speakers and sub-woofers are rated at. Most car amplifiers are also capable of driving 2 ohm loads on a single channel.
The most common error is when an amplifier is bridged, bridged operation utilizes two of the amplifiers channels and sums them together to provide more output. When an amplifier is bridged, its sees half of the load, or in the case of a 2 ohm woofer, 1 ohm. Most amplifiers are not capable of driving this low resistance as it would cause the amplifier to run extremely hot.
Single voice-coil and wiring options
Paralleled configuration means the positive side of one voice-coil and the positive side of the other voice-coil to the positive side of the amplifier. The same connections would be made to the negative side, negative side of one voice-coil and the negative side of the other voice-coil to the negative side of the amplifier.
In this diagram we show you what is potentially a damaging load for most amplifiers. When paralleling dual 2 ohm voice-coils, this creates a load at the amplifier of only 1 ohm. 1 ohm loads for most amplifiers are catastrophic, please check with your amplifier manufacturer before connecting a sub-woofer to the output terminals
Series configuration means that the sub-woofers are wire one after the other. The plus of woofer 1 to the minus of woofer 2, the remaining plus and minus are connected to the amplifier.
In this diagram we show you a load that is safe for most amplifiers. When connecting two 2 ohm voice coils in series you create a 4 ohm load. In a bridged operation this is safe for most amplifiers.
Multiple voice-coils and wiring options
In the examples above we were only talking about a single woofer and single voice coil. When we add multiple sub-woofers we can create different loads or resistance on the the amplifier. The sole reason for driving different loads is to optimize the amplifier to the amount of speakers.
Sub-woofers with dual voice coils have two connections and allow for different wiring options. This is especially useful in system design and allow for more flexibility. A dual 2 ohm woofer can be wired as a 4 ohm in series or 1 ohm in parallel. You can see this allows us a ton of flexibility when doing multi-speaker systems.
When we want massive bass the output of two woofers helps create the system we desire. When using multiple sub-woofers we must consider what the amplifier is capable of and the impedance implications that the multiple woofers present.
When speakers are in series, you add the speaker impedances together for the total impedance. One 4 ohm woofer wired in series to another 4 ohm woofer sums to a total impedance of 8 ohms.
When speakers are wired in parallel, provided they are of equal impedance, you divide the impedance by the amount of woofers. One 4 ohm woofer wired in parallel to another 4 ohm woofer has a total impedance of 2 ohms. Another example is when four 4 ohm woofers are wired in parallel the total impedance is 1 ohm.
Example 1: If we wanted three dual voice coil woofers in our system, and each woofer were dual 4 ohm coils we can wire this so that each woofer has its coils wired in series or 8 ohms each, and each woofer wired in parallel to the others so that the amplifier would see 2.6 ohms.
4 Dual Voice Coil Sub-woofer Setup Example – 1ohm load
Example 2: In this example we will take four dual 2 ohm woofers. We will wire each woofers coils in series making it a 4 ohm woofer, we will then connect them to the other woofers in parallel, the total impedance is 1 ohm for this system.
4 Dual Voice Coil Sub-woofer Setup Example – 4ohm load
Example 3: In this example we will take four dual 2 ohm woofers. We will wire each woofers coils in parallel so each woofer is 1 ohm. We will the wire each woofer in series to the other, the total impedance is 4 ohms.
This allows us to properly match the amplifier with the amount of woofers we want for the desired output. Consideration must be taken to ensure that the amplifier has the output capability to drive these multi-woofer systems. If each woofer is capable of 200 watts and we have three woofers we want to ensure that out amplifier has at least 600 watts of output. It is vitally important that we figure RMS ratings in these estimations as these are real world outputs and ratings. Multi-woofer systems that are underpowered will suffer from poor sound quality and possible damage as you exceed the output capabilities of the amplifier. Exceeding output capability causes the amplifier to clip and has the possibility to damage your woofers. The safer route is to have a slightly overpowered amplifier as it allows for more capability or headroom. This headroom prevents distortion when peaks of music occur and provide excellent sound quality as there is power on reserve for these impactful moments.
4 Dual Voice Coil Sub-woofer Setup Example – 4ohm load
In this photo we have the voice-coil as it should look when it is in new condition. Here you can see the tightly wound copper coil and the copper varnish is not discolored.
Burnt Voice-coil with broken former
This photo clearly demonstrated a damaged voice-coil former and damaged coil. The coil varnish is severely discolored which demonstrates excessive heat caused by distortion. Excessive heat causes the voice coil to separate thereby destroying the woofer.
Burnt Voice-coil with broken former
This photo clearly demonstrates the severely discolored coil varnish. It’s easy to see the charred remains and the unwinding.
The bottom line is we want a sub-woofer and it’s amplifier to have very similar ratings. We want the amplifier output capability to match the woofer input capability at its impedance rating. By doing so we ensure that we have a well powered system and one that was designed with excellent efficiency.
Having three or four subwoofers in your trunk playing at full volume as your driving is nice, but contrary to popular belief a sub-woofer is good for more than just waking up the neighborhood.
A good car subwoofer can enhance your listening experience by providing deep rich bass and by working in unison with the cars speakers, covering every note in the musical spectrum.
Pioneer has always done an excellent job with all of their audio components including their subwoofers. They are relatively inexpensive and all three models are under $120 but they do an excellent job of providing a nice controlled bass.
This years’ shallow mount subwoofers come in an 8 inch, 10 inch and 12 inch size. No matter which one you get the beauty of these subs is that they have an extremely slim design with a mounting depth at under 3 inches for the smallest 8 inch model and under 4 inches for the 10 and 12 inch subs. This means that these subs are designed to fit just about anywhere including under a seat.
The 8 inch sub has 600 watt max rating and 150 watt rms power handling, while the 10 inch has a 1200 watt max rating and 300 watt rms rating, and finally the 12 inch has a 1500 watt max power rating and 400 watt rms rating, so size definitely does effects the power output, and its good to keep that in mind when deciding which subwoofer is the best for you.