【AV 5.1K｜4ch Power Amplifier that Brings Out the Performance of the VOCE Series】

You want a bit more depth in the sound from your factory audio or existing car audio system. Even after replacing the speakers, you may feel the sound lacks cohesion and impact.

That’s where the AV 5.1K comes in.

A VOCE-series power amplifier built by carrying forward the technology developed in the Thesis-series design, packaged in a form that’s easier to integrate into a wider range of systems. It supports outputs of 120W×4ch at 4Ω and 200W×4ch at 2Ω, giving you the power to drive your speakers properly.

Not only does it provide extra headroom when you turn up the volume, but it also makes differences more noticeable in the vocal center, the attack of instruments, and the push of the low end. Even with the same songs you always listen to, you’ll be able to enjoy a greater amount of information—something that factory amplifiers or compact amps often can’t fully deliver—more naturally.

A 4ch Configuration That’s Easy to Use for Your System

With the AV 5.1K, you can use it not only in a front/rear 4ch setup, but also as a 200W×2ch amplifier via a 4Ω bridged connection.

It’s an amplifier that makes it easier to think through how to configure your system based on your vehicle and intended use—such as setups that prioritize the front speakers, or situations where you want to assign channels according to your speaker layout.

The built-in crossover supports high-pass and low-pass. Since the Bch side also includes a mono low-pass, depending on your system configuration, you can also consider pairing it with a subwoofer.

However, a bigger amplifier output isn’t necessarily “better.” It’s important to consider the speaker performance, the signal coming from the factory system, the power supply environment, the connection method, and how you’ll use it in the car.

The Impression of the Amplifier Changes with Installation and Tuning

Even when using the same AV 5.1K, the final result will vary depending on which speakers you drive, how you extract the signal, and how you set the gain and crossover.

At our shop, we don’t just finish after installing the product—we work together to consider a realistic configuration while checking compatibility with your vehicle’s factory audio and existing system.

“ I want to add an amplifier while keeping my factory navigation.”
“ I want to make the front speakers play properly.”
“ I want to combine a subwoofer in the future.”

Whether your goals are already clear like this, or you only have sound-related concerns right now, either situation is fine. The recommended configuration will change depending on your vehicle model, your current system, the music you listen to, and your budget.

It’s best to judge by looking at the actual vehicle—whether adding the amplifier makes sense, or whether it would be better to review other parts first—rather than simply adding an amplifier. If it were me, I would think through everything, including the installation method and tuning, so that after the work you don’t end up saying, “This isn’t the sound I expected.”

If you want to build a serious 4ch system, or if you’d like to bring out even more from the sound after replacing your speakers, please feel free to consult us. Let’s organize your setup together into a system that fits how you use your car—without forcing anything.

Main Specifications

【Basic Information】

• Product name: AV 5.1K
• Series: VOCE
• Type: 4ch power amplifier

【Rated Output】

• 4Ω stereo: 120W × 4ch (14.4V)
• 2Ω stereo: 200W × 4ch (14.4V)
• 4Ω bridged: 200W × 2ch (14.4V)

【Sound Quality Performance】

• S/N ratio: 80dBA
• Frequency response: 4Hz–80kHz
• Total harmonic distortion: 0.04%
• Damping factor: 100

【Crossover】

• Crossover type: 2Way
• Bypass: Supported
• High-pass: 50Hz–5kHz
• Low-pass: 50Hz–5kHz
• Bch mono low-pass: 50Hz–500Hz
• High-pass slope: 12dB/oct
• Low-pass slope: 12dB/oct, 24dB/oct

【Input / Output】

• Input sensitivity: 0.3–5V (Pre In)
• Input sensitivity: 1.4–24V (SPK In)
• Output impedance (stereo): 2–4Ω
• Output impedance (bridged): 4Ω

【Power / Size】

• Supply voltage: 11–15V
• Dimensions (W×D×H): 470×220×58mm

【Options】

• D/A converter: AV bit IN
• Subwoofer volume controller: VCRA

Shop Owner: Komizo