Boss CAP3.5S: main picture thumbnail Boss CAP3.5S: alternate picture thumbnail Boss CAP3.5S: alternate picture thumbnail

Boss CAP3.5S (SILVER)

3.5 Farad Digital Capacitor (CAP35S)

  • 4.2

(11 reviews)

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The product on this page is discontinued.

Specials with this product

  • Free Ground Shipping to the 48 statesdetails

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I stumbled across Sonic Electronix in my search, and all I can say is WOW! Great prices, great service, and great support. When I called customer support I was very happy to speak to a person whos first language is English. Sonic Electronix will now be my go to place for anything electronic related.

- Seth from Dagsboro, DE

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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: SILVER
  • 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

Product History:

Boss CAP3.5S thumbnail
(newest, current model)
Boss CAP32C thumbnail
(previous model, replaced by Boss CAP3.5S (SILVER))
Capacitor Specifications
Capacitance (farads) 3.5 farads
LCD Meter Display Yes
Maximum Input Gauge Size Any Gauge with use of Ring Terminal AWG
Maximum Output Gauge Size Any Gauge with use of Ring Terminal AWG
Built-In Distribution Block No
Primary Color Silver
Illumination Red
Width 4"
Height 4"
Depth 11"
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Manufacturer
Customer Review Summary for Boss CAP3.5S (SILVER)
Average Customer Rating is 4.2 out of 5 stars:
  • 4.2
based on 11 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
.
.
55%
4 star:
.
.
18%
3 star:
.
.
18%
2 star:
.
.
9%
1 star:
.
0%
what's this?
Average Attributes Rating:
Durability
  • 4.2
4.2
Value
  • 4.2
4.2
Features
  • 4.1
4.1
Design
  • 4.7
4.7
Usability
  • 4.6
4.6
what's this?
Quick Comparison:
Most Helpful Customer Reviews:
October 10, 2012 great value
Review by
gony from mcallen texas
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Recommended seller because its really good seller, on time and priced really good.
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August 5, 2012 This Boss Cap rocks
Review by
Just-a-Fool from Shingle Springs, Ca
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I have an Alpine 1400 Watt RMS system in a boat connected to an Isolated Kinetic 2400 Battery. I wanted lots of battery time so the boat could just sit and play without worries. Well the boat rocks. I only have a 55 amp alternator and have not upgraded the main battery wiring. Yes I have a monster battery isolated from the main system by manual switch. I have let the boat sit with the stereo cranked full volume for 6+ hours at a time. Frankly I have never yet drained the Kinetic when doing this. I have this Cap inline in the power very close to the Alpine PDX-1.600 that pushes the Alpine Type R sub. The Cap has a volt meter on it that is very useful and a little light that lights every time the Cap is handling the power deficiency. It works great. I have seen this system drop to 11.4 Volts and still pound hard due to this Cap. As my Kinetic battery starts to drop in voltage this cap goes to work and the Sub-Woofer is never even affected by it. The whole set up works beautifully and this Cap does its job perfectly. Very Happy with the results of this system.
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June 14, 2012 A++++
Review by
eman from austin,tx
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Great product!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I would totally purchase from you again. Thank you.
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May 27, 2012 Good Product
Review by
Brad from Cleburne, TX
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Ive been installing & sellng car audio for 10 years and I recommend this product. This cap has a great value and works like i'ts supposed to. However if youre running small gauge wire and a high wattage amp, this is only a band aid for your system. If you have a good battery, upgraded wiring and a good alternator you dont really need a capacitor.
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May 7, 2012 Good product
Review by
JG from Colorado
Overall
  • 4.0
Durability
  • 4.0
Value
  • 3.0
Features
  • 3.0
Design
  • 5.0
Usability
  • 3.0
The boss cap was a great buy and I recommend it. I have had it for 6 months now and so far it has functioned great. This cap did not take any dimming away which disappointed me there but I found out it could possibly be my alternator, but I don't think it's exactly that. I did notice it gives your subs more power/bass which is phenomenal.
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View All 11 Reviews for Boss CAP3.5S (SILVER)
Ring Terminals
Use these ring terminals to connect the power and ground cable to the capacitor. The more surface area the ring terminal has to the capacitor's terminal, the better the connection will be.
  Product Price Add?
Scosche Ring Terminal (1/0 AWG) Scosche Ring Terminal (1/0 AWG)
Pair of 1/0 AWG ring terminals with 3/8" hole and red and black insulating sleeves.
$3.99
Streetwires Ring Terminals (1/0 AWG) Streetwires Ring Terminals (1/0 AWG)
Pair of 1/0 AWG set screw power ring terminals.
$16.99
Resistors
Before a capacitor is connected directly to the 12V source, it must be charged. Using one of these resistors will allow you to safely charge your capacitor.
  Product Price Add?
Directed DEI Resistors (15-Pack) Directed DEI Resistors (15-Pack)
Pack of resistors with various values (ohms) perfect for the initial charge of your capacitor.
$1.99

Product Summary

Manufacturer: Boss
Model number: CAP3.5S
UPC: 791489108904
Weight: 6.00 lbs
Internal SKU: cap3-5s
Internal product ID: 13128