Infinity Kappa 50.11cs

5-1/4" component speaker system

Item #: 1085011CS

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Legendary sound

Infinity's Kappa Series 50.11cs 5-1/4" component speakers continue in the tradition of this legendary line of speakers, offering rugged construction and impressive sound quality. Once installed, this system will bring out every nuance and detail in your favorite music tracks, making time spent in your car seem more like a concert than a commute.

Large soft dome tweeters

If you're looking for natural-sounding high frequencies, Infinity uses edge-driven 1" soft dome tweeters in this system. The "edge-driven" design creates a larger tweeter that handles more power and delivers smooth response way down into midrange frequencies not covered by smaller "W"-shaped domes. You'll hear a more clearly defined soundstage where you can picture the placement of every instrument. Infinity includes hardware for surface- or flush-mounting the tweeters, plus Starfish brackets that help you install the tweeters in many factory tweeter openings.

Glass fiber woofer with Plus One+ technology

If you like bass, the Kappa glass fiber woofer holds its shape when the power's cranked up, so you still get punchy and defined bass. Glass fiber weighs less than traditional materials, so you don't need a ton of power to drive this woofer. Infinity's Plus One+ woofer technology extends the cone right up to the edge of the basket, giving you more surface area than with most comparable speakers. A bigger cone means more bass to complement the superior high-frequency response. The included external crossovers send the appropriate frequencies to the tweeters and woofers.

Great for any system

These 2-ohm speakers are sensitive enough that you can power them with an aftermarket stereo, but you'll get your best results feeding them plenty of power from an outboard amp — up to 85 watts RMS. Grilles are included.

Product Highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
  • 5-1/4" Plus One+ glass-fiber woofer with hi-roll rubber surround
  • adapter rings included for 6-1/2" openings
  • 1" edge-driven soft dome tweeter
  • Starfish™ mounting brackets for easier tweeter installation in factory locations
  • 2-way external crossover network
  • 2-ohm impedance
  • tweeter adjustment circuits (0, +3 dB)
  • power range: 5-85 watts RMS (255 watts peak power)
  • frequency response: 55-35,000 Hz
  • sensitivity: 93 dB
  • woofer top-mount depth: 2-1/16"
  • warranty: 3 years
  • Our 60-day money-back guarantee

Why install component speakers?

A component speaker system gives you the best possible performance from your car audio system. A system consists of separate woofers, tweeters, and crossovers, each designed to cover one specific range of frequencies. As separate components, the woofer can move freely to deliver more powerful performance, while the tweeter can be custom-mounted in a better spot up closer to your ears, revealing a whole new world of detail. Separate crossovers are far superior to the simple filters wired into full-range speakers, so the components work together for smoother, more focused sound.

Hands-on research

What's in the box?

Download owner's manual

  • 2 Woofers
  • 2 Grilles
  • 2 Grille rings
  • 2 Crossovers
  • 2 Tweeters (each with 6" wire attached)
  • 2 Flush-mount cups
  • 2 Threaded flush-mount adapters
  • 2 Plastic locking nuts
  • 2 Surface-mount cups
  • 2 Starfish tweeter mounts
  • Six 1-1/2" Self-tapping Allen head screws
  • 3mm Allen head bit
  • Eight 1-3/8" Self-tapping screws
  • Four 1" Self-tapping screws
  • Six 3/8" Flat head screws
  • Two M4x10mm Machine screws
  • 2 Washers
  • 16 Speed clips
  • 2 Adhesive backed tweeter grille badges
  • 2 Adhesive backed foam gaskets
  • Instructions

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

Product Research

Woofers
Tweeters
Crossovers

Woofers

Plus One Woofer Cones: The Plus One woofer cones offer more surface area than other speakers that fit in the same size opening. This is accomplished by using a new basket design and hi-roll surround. The result is greater bass output and a significant increase in efficiency.

Formed Glass Fiber Woofer Cones: The formed glass fiber cone material is very light and extremely stiff, minimizing flex. This results in very low distortion and improved clarity.

iCGM frames: The Kappa series speaker baskets are made of composite Injected Carbon Glass Matrix (iCGM). iCGM is lighter and stronger than stamped steel; it retains its shape, even when mounted on uneven surfaces (common in car mounting locations), plus offers exceptional damping of any resonances.

Terminals: The woofers' input terminals are gold-plated set screws that will accept up to 12 gauge bare wire.

High-Output Design: The high output 2-ohm voice coil design compensates for the high in-line resistance of small gauge factory wiring and extracts every watt from factory receivers, increasing overall system output and efficiency (relative to 4 ohm speakers). The speaker's 2.0-ohm impedance combined with the impedance of the factory speaker wire presents a true 4-ohm load to your connected headunit or amplifier. The speakers also benefit from increased power when you upgrade the wire and add aftermarket amplifiers, designed to power a 2-ohm load.

Tweeters

Edge Driven: The 3/4" edge-driven tweeters use textile soft domes. An edge-driven tweeter has better dispersion characteristics and allows for a lower crossover frequency than typical tweeters of the same size, which improves imaging. The result is improved vocals and musical clarity.

Tweeter Mounting: The I-Mount tweeter mounting system and Starfish mounting brackets give you several different ways to mount the tweeters:

  • I-Mount Tweeter Mounting System: The tweeters can be surface or flush mounted with Infinity's innovative I-Mount system:
    • Surface Mount: Surface mounting the tweeters involves screwing the surface-mount cup to the mounting location, then inserting and locking the tweeter into the cup.
    • Flush Mount: Flush mounting is made easy through the use of the threaded flush-mount adapter and plastic locking nut. Once a cutout is made, the flush-mount adapter (with the tweeter installed) is inserted into the hole. The large plastic locking nut is threaded onto the adapter (from behind the mounting surface) to hold the complete assembly securely in place. When flush mounted, the tweeters may be angled for optimum response and imaging.
  • Starfish Mounting Brackets: The Starfish mounting brackets allow the tweeters to be installed in factory locations behind the grilles:
    • Surface Mount (behind grille panel): Once the Starfish bracket is trimmed, it is screwed to the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Flush Mount (behind grille panel): Once the Starfish bracket is trimmed, it is dropped into the cutout in the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Bottom Mount (to grille panel): Once the Starfish bracket is trimmed, it is secured to the underside of the grille panel. The tweeter must be inserted into the bracket and locked into place before the bracket is mounted.
    • Flush Mount (in-dash location): Once the Starfish bracket is trimmed, it is dropped into the cutout in the dash. Then, the tweeter is inserted into the bracket and locked into place.

Tweeter Mounting Dimensions:

  I-Mount Surface Mount I-Mount Flush Mount Starfish Surface Mount (behind grille panel) Starfish Flush Mount (behind grille panel) Starfish Bottom Mount (to grille panel) Starfish Flush Mount (in-dash location)
Mounting Height 0.936" 0.685" 0.943" 0.423" 0.0" 0.423"
Depth 0.372" (screw depth) 0.778" 0.331" (screw depth) 0.586" 1.077" 0.586"
Frame Diameter 1.615" 2.218" 1.655" 2.610" 3.247" 2.475"
Cutout Diameter N/A 1.894" N/A 1.655" N/A 1.655"

Crossovers

Crossovers: The crossovers use low-loss air core inductors, low-hysteresis polypropylene capacitors, and high-quality resistors. Each crossover has a tweeter output level switch; choose between flat and +3dB.

Connections: Each crossover has set screw input and output terminals that will accept up to 10 gauge bare wire.

Crossover Dimensions:

  • Length: 3-3/16"
  • Width: 4"
  • Height: 1-3/8"

Power Handling: Although Infinity lists the RMS power handling as 85 watts, they also list the recommended power range as 5-200 watts RMS. We've opted to list the more conservative 85 watt RMS figure on the specifications page.

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 open the box, verify contents, 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.

Infinity Kappa 50.11cs Reviews

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surprisingly not good

Written By Fairweather Techie, Weschester, NY on Saturday, December 01, 2012

I bought these to pair with the corresponding 6X9's but unfortunately it did not work out well. This was especially disappointing because I have owned and loved Infinity Kappa speakers in the past. The concept behind component systems is to route the frequencies to the speakers that best handle them , well it sort of works because the tweeters produce the best highs I've heard BUT that leaves the main speakers trying to act as woofers with no midrange and it just sounds bad. I could not believe that cheaper speakers produced a fuller sound, I don't know how Infinity let this happen ..

Pros: excellent tweeters extremely well built

Cons: no midrange! vibrations from the woofer

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Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
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Keep your speakers clean and dry. They compress to fit behind your speakers.
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