Infinity’s Kappa K4 4-channel car amplifier can supply a couple of sets of high-performance speakers with 100 watts RMS each — good news for all you music fans out there. Even better, you can stream music directly from a Bluetooth device to this amp, while its built-in processing restores the excitement in your music that data compression removes. Plus, the dancing, signal-level LEDs on the cover add to the amp’s high-tech look and overall coolness factor.
You can stream music from your compatible Bluetooth device directly to the K4, for convenient, wireless play that bypasses your car’s radio. The amp’s preamp outputs let you connect a subwoofer amp, like the matching Infinity Kappa K1000 or Kappa K600, for better-sounding bass in your music. The Party Mode feature allows up to three different sources to stream, so more people can join in the fun. The included wired remote gives you handy controls for Bluetooth streaming, hands-free calling, Party Mode, and Clari-Fi™ signal processing.
Need some bass power? You can switch the K4 into bridged mode and drive two subwoofers with 250 watts RMS each. A high- or low-pass filter matches the amp’s output to your speakers, increasing the efficiency of the system. The Kappa K4 can accept low- or speaker-level inputs so it’ll work in almost any system, and Infinity includes RCA-to-speaker wire adapters so you’ll make the right connections.
Downloaded digital music and streaming services apply data compression to their files so you can store more of them on your devices, but compressed music sounds noticeably duller than uncompressed files. Harman’s Clari-Fi™ sound restoration technology improves the sound quality of your digital music by analyzing the data and then reconstructing the parts that were removed during the compression process. You get crisper highs, increased dynamics, and clearer vocals.
Kappa K4 input and control panel
| Performance | ||
|---|---|---|
| RMS Power Output (Watts x Channels) | 100 x 4 | |
| Peak Power Output (Watts x Channels) | — | |
| Power at 2 Ohms (Watts x Channels) | 120 x 4 | |
| Bridged Power (Watts x Channels) | 240 x 2 | |
| Minimum Impedance Bridged | 4 | |
| Minimum Impedance Unbridged | 2 | |
| Best Frequency Response | 20-20k Hz | |
| THD at Rated RMS Power | 0.1% | |
| Signal to Noise Ratio | 75 dB | |
| Input Voltage | 14.4v | |
| Features | ||
| Amplifier Class | D | |
| Low-Pass Crossover Frequency | 32-320 Hz | |
| Low-Pass Slope (dB/octave) | 12 dB/octave | |
| High-Pass Crossover Frequency | 32-320 Hz | |
| High-Pass Slope (dB/octave) | 12 dB/octave | |
| Bass Boost | No | |
| Bass Boost Frequency | N/A | |
| Fan Cooled | No | |
| Fuse Rating | 60 | |
| Speaker Level Inputs | RCA | |
| Preamp Outputs | 1 pair | |
| Width (inches) | 10-1/4 | |
| Height (inches) | 1-3/4 | |
| Depth (inches) | 6-15/16 | |
| Parts Warranty | 1 Year | |
| Labor Warranty | 1 Year | |
Overview: The Infinity Kappa K4 is part of the Kappa series of high-performance amplifiers. This full range Class D 4-channel amplifier will accept both high-level and low-level inputs. Class D amplifiers are highly efficient and compact, generating lots of power without drawing much current or generating heat. The Kappa K4 includes Clari-Fi, an audio restoration feature that improves the sound of compressed digital files. The amp also includes a cabin-mounted control panel to give you amplifier control at your fingertips. The unit comes with spare fuses, speaker wire-to-RCA adapters, and mounting hardware.
Power Output: The Kappa K4 delivers the following power output:
Clari-Fi: Clari-Fi is a proprietary technology that analyzes compressed digital music files and improves them in real time. Using a predictive algorithm that restores audio content that is lost during the compression process. Clari-Fi provides extra bandwidth, especially in the high frequencies, widens the sound stage, and gives vocals a natural warmth not found in compressed files.
Control Panel: The amplifier comes with a wired control panel that provides numerous features not typically found with amplifiers. It has Bluetooth technology, and an omni-directional microphone for accepting and ending phone calls from your cell phone. Party Mode lets you pair multiple Bluetooth devices for streaming music from anyone’s phone. The control panel also lets you activate the Clari-Fi feature. The panel is 4-7/16″W x 15/16″H, and has a 19.5-foot cable. It can be flush- or surface-mounted with the supplied brackets.
ADAS: The Kappa K4 has an interface for the Advanced Driver Assistance System (ADAS) that can override the audio source input to deliver a message or other audio from a connected ADAS accessory. On the amplifier, you can designate which speaker the ADAS signal is output: Front left, front right, rear left, or rear right.
Protection Circuitry: The amplifier features protection circuitry for thermal overload, over- or under-voltage (<9V or >16V), and short circuits. The LED on the top of the amp glows red if the amp goes into protection mode.
Controls: The Kappa K4’s controls are located on one side of the amplifier. The rotary controls require a small screwdriver (not included) to make adjustments. The amp controls include:
Connections: The Infinity Kappa K4 uses set screw terminals for the +12V power, ground, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided). The amp connections include: