So, you’re set to upgrade your car sound and start looking for amplifiers online and suddenly you are confused on what class you’re getting. “Class?” Is there such thing? Apparently yes, and to make easy for you to choose the appropriate amp for your setup, we’ll try to explain common amplifier classes as simple as possible.


This is the simplest form of amplifier. When you drive input signal from your source (stereo), the exact amount of output is reproduced therefore there is no clipping or distortion on the output (sound). In many ways, this class of amplifier produces the best sound but due to the transistors being always “on” and current continuously running, this creates extreme heat which is not ideal for car audio.


This class of amplifiers are slightly different. There are two devices that are built-in and conducts alternating current to amplify both sides (half of each) of the wave cycle. This dramatically increases efficiency of theoretically about 80% compared with Class A. The only disadvantage of this is that since the transistors only amplifies half of each side of the waveform, it tends to produce distortion and results in low audio fidelity.


These amps are a combination of both the Class A and B amplifiers. The transistors are continuously flowing current through but utilize a circuitry that reduces the flow of current when there is no signal present. As a result, there is a higher degree of efficiency compared to a Class A, and less distortion as to a Class B. With this system, the Class A/B amplifiers are the most common form of full range car audio amplifiers.

Some of the best brands include:


Among the amplifier classes, Class D is the only “switched” amp commonly used in car audio systems. It is different because unlike Class A, B and A/B; which are analog, Class D operate by quickly switching the current through the transistor on and off. By utilizing this, it creates a pulse-like input signal. Although The Class D amplifiers are indeed more efficient that the three classes, the pulsated signal somewhat creates a small amount of distortion particularly in the higher frequencies. To minimize this, you often use a low-pass filter. Various manufacturers already adapted in using the class D for mono subwoofer amplifiers, but many others are also picking up the benefits of power and size and implementing it on full range speakers as well.

You can checkout the following:

So, now that you are equipped with some basic knowledge of amplifiers, the question now is what class suits your taste. The basic rule of thumb is that Class A/B amplifiers are best for full range and mostly component speakers, while Class D amps are better suited for subwoofer drivers. You can experiment with different brands and classes to really find the sound you are looking for but with this basic template, you’ll be on the right track.

All products mentioned in this blog are available at with excellent and competitive prices on our special offers. Just click on the links and and happy shopping.

Soundstream VIR-8300NR DVD Multimedia Receiver w/ 8.3" Display

Today, for our OCS Favorites, which has also just received a price slash, we have the Soundstream VIR-830
0NR featuring a huge 8.3-Inch Rotating Flip-Up Motorized TFT LCD HD Digital Display with an eye pleasing 800 x 400 pixels screen resolution, it's like watching HDTV at home.

Other features include iPod Integration, SDHC Card Reader, Rear View Camera Input, Digital Media Drive, and Variable Subwoofer Level Control.
General Features:
  • 8.3" Motorized TFT-LCD Telescopes Forwards/Backwards w/Pre-Set Angles
  • Playback from DVDR/RW & CDR/RW, Including VCD, MP3, MP4 & DivX
  • 18 FM / 12 AM Station Memory
  • 50w x 4 MOSFET Power
  • Audio Staging Controls
  • Custom & Pre-Set EQ Settings
  • NTSC/PAL Auto Select & USA/European Freq. Stepping
  • 800 x 480 Resolution & 400 NIT Brightness

Soundstream NAVIBOX-1 Navigation Box Module w/ Navteq On Board

We've got the NAVIBOX-1 Plug-n-Play Navigation Box Module w/ Navteq from Soundstream for $109.00. If you were looking to upgrade your video head unit with navigation then don't miss out on this great deal.



General Features:

  • Touch screen control with compatible head units
  • Plug-n-play easy installation & mounting
  • 2 Gigabyte SD card with all USA and Canada map and 7 million points of interest
  • 8 Meg flash memory, 64 Meg SDRAM
  • 20 parallel receiving channels
  • OS 2.6.x Linux based software 400MHz. processor for fast recalculation times
  • The absolute latest in technology "Sirf Star III chip set"
  • Turn by turn instructions (Male & Female, Southern accent, Urban accent)
  • Choice of Quickest Route or Shortest Route
  • 2-D & 3-D viewing of the maps on screen
  • Including GPS antenna
  • 15 foot A/V interface cable
  • Dimensions: 4.1" x 4.2" x 1"

Soundstream VIR-7000NR/T DVD Receiver w/ 7" Touchscreen Display

The VIR-7000NR and 7000NRT (with Built in TV Tuner) offers nearly every multimedia option in one package. Utilize any of the several A/V & AUX inputs to integrate secondary sources, or playback your favorite track playlist from your iPod, USB drive, or SD Card. Let the add-on GPS navigation module NAVIBOX-1 guide you through unfamiliar territory with turn-by-turn directions. Even catch pre-game coverage during your tailgate party with the local digital TV Tuner module DTV-1.



General Features:
  • In-dash Single DIN DVD, AM/FM, CD, MP3, WMA Receiver
  • Over-sized faceplate offers a large screen for vehicles with single DIN slots
  • Motorized, detachable face
  • 4 Adjustable angles with last angle memory
  • 7" Full color display
  • High definition digital panel with 800x480 resolution
  • 400 NIT panel brightness
  • Intuitive touch screen monitor
  • Wireless remote control included
  • Blue and red button lighting
  • Power Output:
  • Peak: 50 watts x 4 channels
  • RMS: 17 watts x 4 channels
  • CD Text Display
  • MP3 ID3 Tag Display (Title/Artist/Album)
  • Playback of DVD, DVD-R, DVD-RW, DivX, MPEG4, VCD, CD, CD-R, CD-RW, MP3, and WMA
  • Tuner with 18FM/12AM presets
  • Audio staging controls
  • Equalizer with preset tone curves
  • USA and European frequency stepping
  • PAL/NTSC Compatible
  • 12/24 Hour clock
  • 3 Sets of 2V preamp outputs (front, rear and subwoofer)
  • Navigation Ready: Power Acoustik NAVIBOX-1 required and sold separately
  • SIRIUS or XM Satellite Radio Ready: tuner, subscription and antenna required and sold separately
  • iPod Ready: Audio playback and controls using the Soundstream IC-2 (required and sold separately)
  • Digital TV Tuner Ready: Power Acoustik DTV-1 required and sold separately
  • Front-panel auxiliary input: 3.5mm (headphone jack) allows connection to portable media devices such as MP3 players, etc.
  • Front-panel USB input: miniUSB port allows connection to USB devices such as flash drives, thumb drives, etc. USB-to-miniUSB cable included
  • Rear audio/video input: 1 set of composite RCA audio and video inputs
  • 1 Rear RCA composite video output
  • 1 Rear RCA composite video input for rear view cameras
  • Steering wheel remote ready: PAC SWI-Xv1 required and sold separately

VIR-8310NRB Multimedia Receiver w/ Bluetooth & 8.3" Display

Introducing the VIR-8310NRB, a car video Multimedia Receiver from Soundstream that features a built-in Bluetooth which enables hands-free calling and the ability to connect to compatible bluetooth devices. The 8.3" Motorized TFT LCD screen is one of largest screens that can be found on an in-dash video player and delivers a crisp and clear high resolution (800 x 480) video playback. Use the VIR-8310NRB to watch your favorite movies on DVD or any of the supported digital video formats like MP4, VCD, and DivX. The VIR-8310NRB will also playback your favorite music on standard CDs or digital music files like MP3 & iTunes AAC files loaded on a data CD or SD card.

The VIR-8310NRB's functionality can additionally be expanded via front panel AUX, USB, and SD Card Slots. 3 sets of 4V pre-amp outputs (front and rear) which makes it easy to add an amplifiers to your system. Connect your iPod via the built-in iPod to USB connectivity which allows charging, control, and playback right through the receiver and stereo system controls. To top off this already massive list of expandability options, the VIR-8310NRB can be upgraded to a GPS Navigation Receiver by adding the NAVIBOX-1.


General Features:

  • 8.3" Motorized TFT-LCD Telescopes Forwards/Backwards w/Pre-Set Angles
  • Playback from DVDR/RW & CDR/RW, Including VCD, MP3, MP4 & DivX
  • 18 FM / 12 AM Station Memory
  • 50w x 4 MOSFET Power
  • Audio Staging Controls
  • Custom & Pre-Set EQ Settings
  • NTSC/PAL Auto Select & USA/European Freq. Stepping
  • 800 x 480 Resolution & 400 NIT Brightness
Technical Specifications:
  • Remote Control: Yes
  • MP3 playback: Yes
  • Maximum Power: 4x50 Watts
  • DIN: 1
  • CD-R/CD-RW Compatible: Yes
  • Built-in EQ: Yes
  • Bluetooth: Yes
  • Audio/Video Inputs: 1
  • Display Size: 8.3 Inch
  • Front USB Input: Yes
  • Audio/Video Outputs: 1