New VIBE POWERBOX SQ Amplifiers — Now In Stock
Two new 4-channel Class D amplifiers built around a simple idea: serious sound quality in the smallest possible footprint. The POWERBOX80.4 and POWERBOX135.4 are now in stock and ready to install.
Most compact amplifiers are a compromise. The POWERBOX SQ range was designed to change that — delivering genuine sound quality performance from a compact, discreet package at a price point that makes no concessions. Two models, one standard: no excuses, just results.
Launched at Carmediaworld Salzburg
The POWERBOX80.4 and POWERBOX135.4 made their world debut at Carmediaworld Salzburg — one of Europe's most respected international car audio trade events, where installers, dealers, and audio professionals come specifically to evaluate new equipment.
The response was immediate. Dealers and distributors who heard these amplifiers in a properly tuned system walked away placing orders. They have been selling fast since the day of the launch and that momentum hasn't slowed.
The Two Models
The POWERBOX SQ range launches with two 4-channel amplifiers. Both share the same compact form factor, the same OEM integration features, and the same Class D efficiency. The choice between them comes down to output level and the level of speaker control you need.
- High-level input for OEM integration
- Auto-sense turn on — no remote wire needed
- Variable crossovers 30Hz–5kHz (HP & LP)
- >100 damping factor for improved speaker control
- Class D — compact, efficient, runs cool
- Lower edge / front access connections for clean cable routing
- High-level input for OEM integration
- Auto-sense turn on — no remote wire needed
- Variable crossovers 30Hz–5kHz (HP & LP)
- >100 damping factor for improved speaker control
- Class D — compact, efficient, runs cool
- Lower edge / front access connections for clean cable routing
Side-by-Side
| Specification | POWERBOX80.4 | POWERBOX135.4 |
|---|---|---|
| RMS Power @ 4Ω | 4 × 80W | 4 × 135W |
| RMS Power @ 2Ω | 4 × 120W | 4 × 210W |
| Maximum Power | 960W | 1680W |
| Topology | Class D | Class D |
| High-Level OEM Input | ✓ | ✓ |
| Auto-Sense Turn On | ✓ | ✓ |
| Crossover Range | 30Hz–5kHz | 30Hz–5kHz |
| Damping Factor | >100 | >100 |
| Form Factor | Compact & Discreet | Compact & Discreet |
| Connection Position | Lower edge / front access | Lower edge / front access |
Key Features
Both POWERBOX models share a set of features that make them genuinely suited to modern car audio installs — not just convenient on paper, but practically useful in the real-world environments installers work in every day.
OEM integration without compromise. The high-level inputs accept speaker-level signal directly from any factory head unit. Combined with auto-sense turn on, the amplifier detects the audio signal and powers itself on automatically. No remote wire. No relay. No additional components. In modern vehicles where the head unit is deeply integrated into the car's electronics, this is the difference between a professional result and a messy workaround.
💡 Both the POWERBOX80.4 and POWERBOX135.4 feature a damping factor of over 100. This is one of the key reasons we call them the POWERBOX SQ range. A damping factor of over 100 means the amplifier exerts strong, precise control over the speaker cone's movement — tighter bass, better transient response, and greater accuracy across all frequencies. These are qualities that define a sound quality amplifier, and at this size and price point, having it in both models is not something you take for granted.
Crossover flexibility. The 30Hz to 5kHz crossover range on both models covers the full spectrum of practical car audio requirements. Whether you're integrating a subwoofer, running an active component speaker crossover, or tuning full-range coaxials — you have the tools to do it without needing a separate processor for basic crossover duties.
Small and discreet by design. The compact dimensions of both POWERBOX models aren't a side effect of cutting corners — they're the point. Small enough to fit under seats, behind trim panels, and into installation spaces where a conventional amplifier simply wouldn't go. For modern vehicle builds where a clean, hidden install matters as much as performance, these amplifiers disappear into the car.
Lower edge / front access connections. Every input, output, and power connection on the POWERBOX80.4 and POWERBOX135.4 runs across the lower edge of the amplifier — not along the sides or ends. This is a deliberate design decision that makes a real difference in the installation bay. Cables connect along that single lower edge and can be dressed neatly away out of sight, keeping the amplifier itself clean and the surrounding area uncluttered. The result is a significantly tidier install with far less visible wiring.
🔌 Built for clean wire installs. Bottom-mounted connections directly support the growing trend of clean wire installation — builds where every cable is hidden, routed through panels, or concealed behind trim. The POWERBOX SQ range was designed with this in mind from the start, making it a natural choice for installers who care as much about how a build looks as how it sounds.
Installation Applications
| Application | Why It Works | Best Model |
|---|---|---|
| Factory OEM Upgrade — Tweeters, Midrange & Smaller Door Speakers | High-level input + auto-sense = seamless integration, no extra wiring. Ideal power level for tweeters, midrange and smaller door speakers. | POWERBOX80.4 |
| Factory OEM Upgrade — Larger Door Speakers & Woofers | Higher RMS output drives large door speakers and woofers with greater headroom and control. Same plug-in OEM integration. | POWERBOX135.4 |
| Component Speaker System | 30Hz–5kHz crossover handles active crossover duties natively | Both |
| Clean Wire Install | Lower edge / front access — all connections on one edge, cables dress away cleanly | Both |
| Stealth / Sleeper Build | Compact and discreet — disappears under seats or behind any trim panel | Both |
| SQ Competition Build | >100 damping factor on both models + pair with CVEN DSP for full precision control | Both |
| Modern EV / Premium Car | Auto-sense operates with complex factory electrical systems — no remote wire | Both |
Run both POWERBOX amplifiers together with the VIBE CVEN 10-Channel DSP and you have a complete, properly engineered SQ system — with full DSP control over every driver in the car and two channels left over for subwoofer amplification. This is exactly the kind of system that stopped dealers and distributors in their tracks at Salzburg.
10CH DSP
BOX80.4
BOX135.4
Amplification
Ch 3 & 4: Left & right midrange
Ch 7 & 8: Left & right woofers
Order the VIBE POWERBOX SQ Range
Both models are available now at vibeaudio.co.uk and through the VIBE Audio approved dealer network. The same amplifiers that debuted at Carmediaworld Salzburg to immediate orders from the professionals who heard them.
In Summary
The POWERBOX80.4 and POWERBOX135.4 are two amplifiers that take compact car audio seriously. OEM-friendly, crossover-equipped, and built for SQ — in a footprint that fits anywhere. Both are in stock now.
For full system control, pair either model with the CVEN DSP — time alignment, parametric EQ, and crossover precision from your phone. For speakers, the CVEN SQ range is what these amplifiers were designed to drive.
And if you want to hear what they're genuinely capable of in a full, properly tuned system — stay tuned. There's a full feature install story coming very soon. #JustListen.
Frequently Asked Questions
What is the difference between the POWERBOX80.4 and POWERBOX135.4?
Both are compact 4-channel Class D amplifiers with the same OEM integration features and 30Hz–5kHz crossover range. Both deliver a damping factor of over 100 — one of the key reasons for the SQ designation. The POWERBOX80.4 delivers 4 × 80W RMS at 4Ω (960W maximum). The POWERBOX135.4 delivers 4 × 135W RMS at 4Ω (1680W maximum). The difference between them is output power — not sound quality credentials.
Will these amplifiers work with my factory head unit?
Yes. Both models feature high-level speaker inputs and auto-sense turn on. They accept speaker-level signal directly from any factory head unit and power on automatically when audio is detected — no remote wire, no relay, no additional components required. This makes them ideal for modern vehicles where replacing the head unit isn't an option.
Where were the POWERBOX SQ amplifiers launched?
The POWERBOX80.4 and POWERBOX135.4 made their world debut at Carmediaworld Salzburg — one of Europe's most respected international car audio trade events. They were demonstrated as part of a complete VIBE SQ installation and dealers and distributors in attendance walked away placing orders on the day. A full feature on that install will be published on the VIBE Audio news page soon.
What crossover options are available?
Both POWERBOX models feature variable high-pass and low-pass crossover filters adjustable from 30Hz to 5kHz. This range covers subwoofer integration at the low end and component speaker crossover points at the high end. For systems requiring more precision — parametric EQ, time alignment, and advanced crossover control — pair either amplifier with the VIBE CVEN DSP.
Are both models in stock now?
Yes — both the POWERBOX80.4 and POWERBOX135.4 are in stock now at vibeaudio.co.uk and through VIBE Audio's approved UK dealer network. They have been selling fast since the Salzburg launch.
What speakers work best with the POWERBOX amplifiers?
The POWERBOX SQ range was designed with the VIBE CVEN SQ speaker series in mind. The CVEN range is VIBE's flagship sound quality speaker line — designed to be driven by amplifiers that prioritise control and accuracy over raw power. The pairing of CVEN speakers, POWERBOX amplifiers, and CVEN DSP represents the complete VIBE SQ system. A full install feature showcasing exactly this combination is coming soon.