JVC KW AVX 840
Audio Section
24 Bit D/A Converter: The JVC KW-AVX840 utilizes a 24-bit digital to analog converter for superior sound quality.
MOSFET Amplifier: The KW-AVX840 is equipped with a MOSFET amplifier. Compared to conventional power supplies, the MOSFET amplification circuit is smaller and more efficient, and it delivers increased power with less distortion and absolutely zero on/off switching noise. More power means louder and cleaner music at higher volumes because you're not pushing the limits of the amplification circuit.
CEA2006 Compliant: The power specifications for the KW-AVX840 are compliant with the CEA2006 Mobile Amplifier Power Testing and Measurement standards from the Consumer Electronics Association (CEA). These standards were developed as a way to equitably compare power specs from model to model and between manufacturers. The power output specs for the KW-AVX840 are as follows:
CEA2006 Specs: 20 watts RMS x 4 channels (at 4 ohms, 20Hz-20kHz, 1% THD-N)
Maximum Power Output: 50 watts x 4 channels (200 total watts)
Amplifier Gain Control: When you are using the KW-AVX840 with factory speakers (or those rated to less than 50 watts peak), the Amplifier Gain Control can limit the amount of power being sent to those speakers. When the Amp Gain Control is set to low, the volume control ranges from 0 (minimum) to 30 (maximum). When using speakers rated higher than 50 watts peak, you can set the Amp Gain Control to high, and the volume control will range from 0 to 50. The internal amp can also be turned off when all the speakers are powered by outboard amplifiers.
5ch/4V Preamp Outputs: The KW-AVX840 is equipped with 5ch/4.0V preamp outputs (Front, Rear, Subwoofer). The front and rear preamp outputs allow fader control, while the subwoofer preamp output is non-fading.
Subwoofer Controls: You can adjust the KW-AVX840's subwoofer level (-50 to +10) independently from the head unit's main volume control for added bass volume. You can also adjust the subwoofer phase between Normal or Reverse to blend the bass sound better with the rest of the speakers in your system.
Built-in Crossovers: The JVC KW-AVX840 features a built-in high-pass filter for the unit's front & rear speakers, and a low-pass filter for the unit's subwoofer output.
High-Pass Filter: You can activate a variable high-pass filter (40, 60, 80, 100, 120, 150, 180, 220 Hz or Through) for the unit's front & rear channels (speaker- or preamp-level), so low frequency signals are cut off from your system's front & rear speakers. The front & rear channel's high-pass filters can be set independently of one another.
Low-Pass Filter: The unit's subwoofer preamp output features a low-pass filter. In order to prevent high-frequencies from being sent to your system's subwoofers, you can set the cutoff frequency of the low-pass filter to 50, 60, 80, 100, 120 Hz or Through.
Speaker Select: You can select which type & size of speaker you have connected to the head unit. Choose from Standard (OEM/Factory), Narrow (4"/5"), Middle (6"/5x7"/6x8"), Wide (6x9").
Pro EQ: The KW-AVX840 is equipped with JVC's Pro EQ. The integrated equalizer offers 8 preset sound modes (Flat, Natural, Dynamic, Vocal Boost, Bass Boost, Vibrant, and User) suitable for the music genre of your choice. The User mode allows you to manually adjust the head unit's 3-band parametric EQ (Frequency, Level, and Q-Factor).
Tone
Frequency Level Q
Bass 60, 80, 100, 150 Hz +/- 10 dB (-5 to +5) 1.0, 1.25, 1.5, 2.0
Midrange 0.5, 1.0, 1.5, 2.0 kHz +/- 10 dB (-5 to +5) 1.0, 2.0
Treble 10.0, 12.5, 15.0, 17.5 khz +/- 10 dB (-5 to +5) Fixed
Note: The audio adjustments are memorized for each source until you adjust the sound again.
Loud (Loudness): This feature boosts low and high frequencies to produce a well-balanced sound at a low volume level. You can set the Loudness to On or Off.
Dynamic Range Compression: This function reduces a Dolby Digital soundtrack's dynamic range so you can hear quieter dialog without being overwhelmed by loud sections. You can choose a setting of Auto or On.
Volume Adjust: The input level of each source (other than FM) is adjustable relative to the FM radio volume, so there isn't a significant volume difference when changing sources. Each source is individually adjustable from -15 to +6.
Key-Touch Tone: The in-dash head unit provides an audible beep to confirm button operation. This function can be turned On or Off.
