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Boss CAP3.5B (BLACK w/ BLUE)

3.5 Farad Digital Capacitor

Discontinued
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This item has been discontinued

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When heavy bass notes in your music hit, the current demand on your system greatly increases and could cause voltage drops. This stiffening capacitor acts as a power reservoir, instantaneously supplying added power to keep your system playing strong.
  • 3.5 Farad Digital Capacitor
  • Color: BLACK W/BLUE Design
  • Digital voltage level display
  • Chrome finish terminals
  • Includes mounting brackets
  • 20V DC
  • 24V Surge
  • Dimensions (without mounting brackets): 11"L x 4"W x 4"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Capacitor Specifications

Capacitance (farads)
Capacitors are rated in farads, and at times microfarads or millionths of a farad. The more farads the capacitor is rated at, the more electrical charge (and wattage) the capacitor will hold. Capacitance is defined as the property of storing an electrical charge between two separate conductors.
3.5 farads
LCD Meter Display
Displays the current voltage and/or other specification on an LCD readout.
Yes
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
Any Gauge with use of Ring Terminal AWG
Maximum Output Gauge Size
This number refers to the maximum size of wire that will fit into the output connector(s) of the capacitor, battery terminal, or any other connector with an wire output.
Any Gauge with use of Ring Terminal AWG
Built-In Distribution Block
A built-in distribution block simply means that the item includes a distribution block. The built-in distribution block will split the single power input into a multiple power output.
No
Primary Color
This is the main color of the item.
Black
Secondary Color
A color that compliments the main color of the product.
Blue
Illumination
This is the color of the illuminated LED lights on the unit.
Red
Width
The width of the item from left to right (side-to-side) measured in inches.
4"
Height
The height of the item, measured from top to bottom, in inches.
4"
Depth
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
11"

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
62%
4 Star
23%
3 Star
8%
2 Star
0%
1 Star
8%

Average Attribution Rating

Durability
4.4
Value
4.5
Features
4.2
Design
4.5
Usability
4.5
Tim

Tucson, AZ

Overall
Durability
Value
Features
Design
Usability
Good for low watt system that is about 600watts.

April 15, 2010

I bought this over six months ago in hopes of stopping the dimming in my truck. I have this one and another one that is Boss too, but my set up is pulling too much for the both of them. I have a 1200 watt mono one channel Phoenix Gold RDS pared with a 10" Phoenix Gold RDS DVC 2400 watt peak. Here's the thing if I don't have it turned all the way up, it does fine, but as soon as I turn it up the voltage meter drops on my Alt gauge when it's pulling for the lows, but the highs and mids it does okay. It's not as bad when I'm going down the road neither. All together I have 5.5 Farad in my truck, and they say you should have 1 farad for every 500 watts. I have done this and I still getting a dimming problem. I also can't adjust this one because the holes on top of the Cap were missed drilled. I didn't notice it until I had it installed, so what I am saying is I don't know if I would have this problem if I could re adjust it. It looks great and works for the money I paid. What I also like about it is, it came with every thing you needed and I looked around for a good priced one. This was the best priced one I found. Now, would I tell some one to buy this, well yeah if your starting out and your not going to spend a lot of money on your system. Now if you going to spend some money I would tell you to get StreetWire, Monster, Rockford, ECT. You do get what you pay for when it comes to car audio, but all and all it's not the worst thing out there by far. I have Boss car audio in my system ( crossover ), so I don't hate the brand at all

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Konstantin

Bulgaria

Overall
Durability
Value
Features
Design
Usability
Boss CAP3.5B (BLACK w/ BLUE)

March 29, 2010

I mounted this CAP 2 months ago and so far it's working good. It made significant increase in the power output from my two amps in the car. A good buy.

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Trent

Cincinnati, OH

Overall
Durability
Value
Features
Design
Usability
Good Cap for the Price

March 17, 2010

Having only a 1600w max system, a 3.5 Farad capacitor should more than do the trick to help with headlight dimming. This one works pretty well, but I do still notice very slight dimming when I'm parked and the volume is way up. Having said that, at slightly more reasonable volumes it works like a charm and has a cool light display, too. I would recommend to people with systems around my 1500w, but anything much higher I would probably invest in a more expensive cap. Overall, it's a good product - don't hesitate if you're on a budget!

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Scott

Tucson, AZ

Overall
Durability
Value
Features
Design
Usability
Nice Cap

March 14, 2010

Works good. My amp never clips out. Headlights still dim a little, but not as bad. I just need a alternator with a little more amperage. Voltage display is a nice touch.

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Lite Skin

San Diego, CA

Overall
Durability
Value
Features
Design
Usability
Good price, excellent product

July 30, 2009

This cap works very well, and it looks excellent in the back of the car. My battery doesn't die, my lights don't dim, and I have a very high powered amp with a 12" w7 JL in the trunk. With components and so forth. So, I guess it's doing it's job! Oo yes, and it has a nifty litle light presentation when you open the trunk. Sweet

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KS

East Side PA

Overall
Durability
Value
Features
Design
Usability
Fail

November 10, 2010

This product honestly sucks. If you go and tighten the posts they snap internally. I tossed it in the trash after an hour of owning it.

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yep

Ohio

Overall
Durability
Value
Features
Design
Usability
3.5 farad cap

September 1, 2010

This item worked great for all my electronics in my car.

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christian

29 palms, CA

Overall
Durability
Value
Features
Design
Usability
great for the price

December 23, 2009

it was easy to install. came with all the required equipment. Kind of took a long time to charge but who cares, it charged like it was suppose to and now my lights dont dim as bad but they do still dim a little but I didn't think that this would be a fix all. Next thing I'm going to get is a battery from here to replace my stock battery.

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Taylor

San Diego, Ca

Overall
Durability
Value
Features
Design
Usability
Great buy

December 14, 2009

This was very much worth the money, changed the sound drastically for the better. Im running an orion hcca and it brought the lows lower and brought out high's id never heard before. The clarity and sound quality boost was amazing. It looks great too!

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BEN

EL PASO ,TEXAS

Overall
Durability
Value
Features
Design
Usability
B0SS CSP 3.5B

November 16, 2009

ITS a awesome boss csp 3.5b i can feel the thunder in my rear bass speaker the energy is right there ,when you really crank its beautiful rich bass as the BOSS CAP does it job, i never had a farad on my system but i install one and awesome you can see the voltage on digital display it impresses my friends as well this BOSS is huge and attractive comes with easy install instructions leaves you breathless thanks

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jim

ri

Overall
Durability
Value
Features
Design
Usability
Very good.

November 4, 2009

Excellent especially for the price.

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Ken

Spring Valley

Overall
Durability
Value
Features
Design
Usability
Perfect Product, Perfect Price

June 23, 2009

I got 2500w and it keeps up all day long. Broke the welds on my trunk....! Still have same battery, headlights no longer look disco!

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Mike

Rocky Mount NC

Overall
Durability
Value
Features
Design
Usability
Good Product

May 14, 2009

I installed this cap in my wife mazda millenia pushing 2 10's in a bandpass box with a mono kenwood 300w and a lightning audio on my front mids and highs.This cap works great minimizing my headlight dimming considerbly.It gives my system a very strong boost and all around sound.I liked it so good that I bought another one for my Saturn Vue.In the vue it powers a RF Power 500T which then powers 2 Kicker L5 in a ported box. This setup really pounds like you would not believe!The price was wonderful as well.Best bang for the buck!!!

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Accessory Tools and Products

Accessories added

Scosche Ring Terminal (1/0 AWG)

Pair of 1/0 AWG ring terminals with 3/8" hole and red and black insulating sleeves.

Your Price $3.99

Streetwires Ring Terminals (1/0 AWG)

Pair of 1/0 AWG set screw power ring terminals.

Your Price $17.95

NVX Precut Power/Ground Wire (1/0 AWG)

5 ft. of NVX's HyperFlex power/ground cable with high-current transfer and gunmetal gray insulation.

Your Price $29.99

NVX XW0BL20

20 Ft Pre-Cut Piece of 1/0 Gauge EnvyFlex Power or Ground Wire

Your Price $84.99

Directed DEI Resistors (15-Pack)

Pack of resistors with various values (ohms) perfect for the initial charge of your capacitor.

Your Price $1.99

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Product Summary

Manufacturer

Model Number

CAP3.5B

UPC

791489108911

Weight

6.00lbs

Internal SKU

cap3-5b

Internal Product ID

13309

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: Boss CAP3.5B (BLACK w/ BLUE)