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Jensen DUBa4100

4-channel car amplifier — 70 watts RMS x 4

Item #: 110DUB4100

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10 Reviews | 2 questions - 6 answers


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Jensen + DUB

Since 1925, Jensen has been a pioneer in home and car electronics, developing landmark products such as the first high-efficiency loudspeaker and the first car stereo speaker.  Now Jensen has partnered with DUB® magazine, the leading publication in the urban automotive lifestyle market, to introduce DUB Edition speakers and amplifiers, featuring DUB-designed cosmetics and co-designed components.

Good news for your next cruise

The DUB Series DUBa4100 4-channel amplifier will send 70 watts RMS to each of your front and rear speakers, while its variable frequency filters and bass boost let you zoom in on the sound you want. You can also set up the DUBa4100 can also be wired to drive two channels at 170 watts for a 4-ohm load, making it a good choice for driving subwoofers as well.

This Class AB amp uses a MOSFET power supply and high-current output transistors to deliver strong, reliable power, and it features full short-circuit, DC offset, and thermal protection, so the music won't stop until you want it to. And why would you want it to? You've got DUB on the case. 

Product Highlights:

  • 4-channel car amplifier
  • 70 watts RMS x 4 at 4 ohms (90 watts RMS x 4 at 2 ohms)
  • 170 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • Class AB amp technology
  • variable low-pass filter (40-300 Hz, 12 dB/octave)
  • variable high-pass filter (40-300 Hz, 12 dB/octave)
  • variable bass EQ: 0-12 dB at 45 Hz
  • preamp inputs and outputs
  • fuse rating: 20A x 2
  • 8-gauge power and ground leads recommended—wiring and hardware not included with amplifier
  • dimensions: 14-3/8"L x 2"H x 8-1/8"W
  • frequency response: 10-60,000 Hz
  • weight: 6.4 lbs
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Jensen DUBa4100 Reviews

Average Customer Review:

10 Reviews

Whole Lotta Amp

Written by: flyrod from anderson, SC on February 5, 2016

Crutchfield Customer Review (What's this?)

This amp makes my Kickers sound loud and clear. RF powered sub barely keeps up.

Pros: Price and reviews. My ears are still ringing. Can't go wrong with Crutchfield

Cons: none so far


Written by: phillip from Savannah mo on January 27, 2016

Crutchfield Customer Review (What's this?)

great little amp running 2 6" door speakers and 2 6"x 9" rear speakers

Pros: price

Cons: none

pretty nice

Written by: Daniel from kill devil hills, NC on January 22, 2016

Crutchfield Customer Review (What's this?)

Good amp powers my door speakers great has not over heated or cut off

Pros: 70w rms good power for door speakers works great doesn't get really hot nice quite and slick looking

Cons: Came with horrible wire don't use and had to buy a ground loop insulator to stop alternator wine

perfect for my needs

Written by: David from Richmond, Virginia on January 17, 2016

Crutchfield Customer Review (What's this?)

used this to amplify 4 Kenwood 5 1/4 speakers. It does a decent job at a fair price. I'm satisfied with the resultson



Don't buy this

Written by: Shawn from Santa Rita, Guam on December 22, 2015

Crutchfield Customer Review (What's this?)

Wattage rating is definitely not 800 watts as it says on the box. I have this amp pushing two Infinity Primus PR6500cs front speakers and two Infinity Primus PR9603is in the rear. Amp shuts off after an hour of play. Will be returning for something better.

Pros: None

Cons: Cheap and weak

Works Great

Written by: Anonymous from California on September 30, 2015

Crutchfield Customer Review (What's this?)

Powering my 6x9s rears and 6 3/4 fronts. Plenty of power, every thing sounds great!



Loud and clean!

Written by: AdamD from Kansas on September 29, 2015

Crutchfield Customer Review (What's this?)

Great price on a great amp! Even at high volume there is no amp hiss present!

Pros: Good power. Normal amp hookups. Smaller footprint for easy install.

Cons: Yet to find any.


Written by: Randy I from Michigan on August 5, 2015

Crutchfield Customer Review (What's this?)

Purchased this amp to power my 6 3/4 front and 6x9 rear speakers. Such incredibly loud and detailed music. Glad i listened to the reviews of others on this purchase.

Pros: Clean sounding music. Good design.

Cons: None at this time. No complaints at all

Great Amp as Expected

Written by: Mike D. from Georgia on May 28, 2015

Crutchfield Customer Review (What's this?)

I bought this amp to replace another (Jensen XA4100; 50 x 4 Car Amplifier) that I purchased from Crutchfield over a decade ago. It finally blew after 12+ years of service and I needed something to push my '96 Mazda B3000's front and rear (Kenwood) 6 x 8's accompanied by a powered 12" sealed Sub. This one fit in the exact mounting place of the Jensen XA4100 with the wiring and wiring method being identical (11 minute uninstall/install, lucky me...). The tuning options I needed for my 4 channel set-up were similar, if not identical to that of the Jensen XA4100 I replaced with it's variable input levels, filter selection and continuously variable crossover points per front/rear channel(s). The power is there when I need it and it's clean power, living up to it's high 100dBA Signal to Noise Ratio. When I 'push' the system in my truck 'hard' for long periods of time it heats the amp up a bit, but no problems there as it never gets to the point that thermal protection has to kick in and it sounds great throughout it's range moderate to loud. No old school fins on this one for cooling, but it is generously vented on the bottom of the unit with cooling in mind. I am very happy and satisfied with my purchase of this Jensen amp and if the performance and service (12+ years) is anything like the older Jensen amp I replaced, I will continue to love Jensen and their "great bang for your buck" 4 channel amp(s). Not a competition amp, but aggressive and clean.

Pros: Extensive Tuning options, Rugged and Modestly stylish, Robust and clean Power

Cons: None, at this time.

Great amp

Written by: AP from Baltimore MD on July 18, 2014

Great amp, powers my kenwood 6x9s and rockford fosgate 5 1/4s very well!! Good price as well!

Pros: Easy setup, great power

Cons: n/a

Hands-on research

What's in the box?

Download owner's manual

  • 4-Channel Class AB amplifier with two 20A ATO fuses installed
  • Spare 20A ATO fuse
  • 2 End caps (installed)
  • 4 Machine screws for end caps (M3 x 6mm)
  • 4 Self-tapping screws (Length=15mm)
  • 4 Flat washers
  • 4 Split lock washers
  • Installation & Operation Manual
  • Performance Certification card

Product Research



Overview: The Jensen DUB Edition amplifiers offer performance and value for your vehicle's sound system. With a MOSFET power supply and high-current Toshiba bi-polar output transistors, the DUB amps provide lots of power and control to give your music impressive punch and clarity. The Class AB design reduces idle current and minimizes distortion.

Power Output: The DUBa4100 4-channel amplifier delivers the following power output:

  • CEA Specifications: RMS power output @ 1% THD+N, 20-20kHz, 14.4 VDC:
    • 70 watts x 4 @ 4 ohms
    • 90 watts x 4 @ 2 ohms
    • 170 watts x 2 bridged stereo @ 4 ohms
  • RMS Power Output @ 2% THD+N, 1 kHz, 14.4 VDC:
    • 75 watts x 4 @ 4 ohms
    • 100 watts x 4 @ 2 ohms
    • 200 watts x 2 bridged stereo @ 4 ohms

Protection Circuitry: The amplifier features protection circuitry for thermal overload, DC-offset, and short circuits. The LED on the top of the amp glows yellow if a fault is detected.

Pass-thru RCAs: The DUBa4100 has a pair of RCA connectors that allow you to connect additional amplifiers without having to use a Y-adapter. The line output is unfiltered, providing the same signal as the RCA input.

End Caps: The DUB Edition amps include end caps to cover the wiring and controls for a clean installation. The end caps can be painted to match your vehicle, if desired. The end cap brackets can be removed if you wish to install the amp without the end caps.


Input Level: The DUBa4100's rotary gain control let you match the amp's input sensitivity to the output of the source unit. There are independent input level controls for the front (Channels 1&2) and rear (Channels 3&4). The input sensitivity range of the amplifier is continuously variable between 400mV and 5V. A small screwdriver (not included) is required to set the gain.

Crossover: The amp features 12 dB/octave crossovers that are adjustable from 40 to 300 Hz. There are independent crossovers for the front (Channels 1&2) and rear (Channels 3&4). A 3-way switch lets you configure the crossovers for high-pass or low-pass operation, or switched to full-range to defeat the crossover.

Bass EQ: The DUBa4100 has a 0 to 12dB bass EQ, centered at 45Hz. There are separate Bass EQ controls for the front (Channels 1&2) and rear (Channels 3&4). These are useful for varying the amount of bass if you're running the amp in bridged stereo for driving subwoofers. Ported and Bandpass enclosures should be limited to approximately +6dB to +9dB of boost, while sealed enclosures should be able to accept the full +12dB of boost.

Mode Switch: The Mode switch is a 3-way slide switch that lets you configure the amp for three different input modes: 2 channel (feeds signal to all 4 channels from 2 inputs), 3 channel (feeds signal to all 4 channels with a stereo input for the front and a mono input for the rear), or 4 channel (feeds signal to the 4 channels with individual inputs for each).


Terminals: The Jensen DUBa4100 uses screw terminals for the +12V power, ground, turn-on (remote) lead, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided).

Power/Ground: The +12V Power and Ground terminals will accept spade connectors up to 7/16" (0.4375") wide. It is recommended that you use an 8 AWG power wire to the battery, with an in-line 40A fuse installed no more than 18" from the battery terminal. An 8 AWG ground wire (minimum) should be used, and attached to a metal area close to the amplifier.

Remote Turn-On: The Remote screw terminal will accept a spade connector up to 5/16" (0.3125"). Typically, an 18 AWG turn-on lead is included in an amplifier wiring kit.

Low-Level Input: The amplifier is equipped with two pairs of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp. A stereo RCA line output is also provided for daisy-chaining another amplifier without requiring a Y-adapter.

Speaker Outputs: The amp features four positive and four negative screw terminals for connecting four speakers in stereo. To bridge the amp to 2 channels, you should connect the Channel 1 & 3 left + and the Channel 2 & 4 right - terminals to the speakers. You can also connect the amp in 3-channel mode by wiring the Front channels in stereo to two full-range speakers, and bridging the Rear channels to a subwoofer. The terminals will accept a spade connector up to 5/16" (0.3125") wide. It is recommended that you use a minimum of 12 AWG wire.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

Crutchfield asked  
Why did you buy this?

specs on amp were the closest to my speakers without going over. I prefer to have my amps underdrive my speakers by a small amount to help idiot proof the system and avoid blowing a speaker. [ Donald  Feb 03, 2016 ]
Because it's features. [ R  Jan 30, 2016 ]
product features, awesome price and great review were the reasons to chose this. [ Quamrul  Jan 29, 2016 ]
Was looking for a low cost amp without a fan that would be suitable for an offroad toy that will subject the amp to lots of dust and vibration. We will have to wait and see what happens. [ Thomas  Jan 03, 2016 ]
Price. I respect Crutchfield to sell quality equipment regardless of price. [ JAMES  Jan 03, 2016 ]
Surprisingly enough, I have always avoided Jensen for no other reason than I view them as the "bargain brand". However, I began noticing Jensen has consistently good product reviews. I junked my supposedly "better than Jensen" Clarion deck last year for a Jensen. Today it's an amp for my nephew for Christmas. [ Mark  Dec 20, 2015 ]
Great reviews [ Adrian  Dec 16, 2015 ]

2 questions already asked

Can only be used for the 4 door speakers or 2 door speakers and a sub, but it cant do all 4 and a sub [ Steven  Aug 10, 2015 ]
Hey Tim, this one has 2, 3 or 4 channel mode(s). The wiring diagram displays (3) hook-ups. They are: (1) - Four speakers. (2) - Two speakers and a bridged sub. (3) - Two subs. Hope this helps. The Four speaker and Sub into 1 amp scenario would require a 5 channel amp, I believe. [ Michael  Aug 09, 2015 ]
No, it will only power 4 door speakers or 2 speakers and a sub. You will need a 5 channel amp to power 4 speakers and a sub. [ Jeff A.  Aug 08, 2015 ]
Dpends on how you wire your speakers, if the amp can drive two of your speakers per channel you have two left over for the sub which in most cases is ideal. However if you speakers need more power a 5 channel amplifier is probably a better choice [ russell  Aug 08, 2015 ]
2 Door and sub, but suggest best application use this for 4 speakers and get seperate or built in power for sub as I used. [ MURRAY  Aug 08, 2015 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Greg  Jul 08, 2014 ]  Staff