Blurred Vision Audio KNOCKOUT SERIES BV-4STACK8.4 8"

🥊 Blurred Vision Audio BV-Knockout Series – BV-4Stack8.4

Don’t let the size fool you — this 8" subwoofer hits harder than most larger drivers!

Engineered to deliver clean, powerful, and precise bass in a compact form, the BV-4Stack8.4 from the Knockout Series packs serious punch and performance. Perfect for small enclosures or multi-sub setups, this little monster is built to take every note you throw at it without missing a beat.

📋 Specifications

Feature Specification

Subwoofer Size 8"

Peak Power 1,100 Watts

RMS Power 500 Watts

Frequency Response 30 Hz – 1,200 Hz

Sensitivity 84.6 dB

Voice Coil 2.5" 4-Layer High-Temp Kapton BASV

Impedance Dual 4 Ω (2x4Ω)

Xmax 15 mm

Magnet Size 150 oz

Basket Type Powder-Coated Black Die-Cast Aluminum

Cone Material Pressed Paper with Carbon Fiber Finish

Surround Type Custom 1" High-Roll Foam

Tinsel Leads XL Flat Sewn-In Heavy-Duty Leads

Terminals Silver Push Spring-Loaded Terminals

Mounting Depth 6.5"

Overall Diameter 8.75"

Weight 18 lbs

💪 Performance Highlights

Compact 8-inch powerhouse designed for clean, tight, and responsive bass.

2.5-inch 4-layer Kapton voice coil provides exceptional power handling and thermal stability.

High-roll foam surround and carbon fiber cone deliver precise low-end control and durability.

Die-cast aluminum basket ensures strength, rigidity, and reduced resonance.

Flat sewn-in tinsel leads for increased reliability under high excursion.

🔊 Small Size, Knockout Sound

The BV-4Stack8.4 lives up to its name — a small subwoofer with knockout performance. Whether you’re running a compact system or building an array of subs, this unit delivers deep, accurate bass that stands up to much larger competitors.

Blurred Vision Audio’s Knockout Series proves that size isn’t everything — it’s all about precision, design, and raw output.

 Additional Information 

This Blurred Vision BV-4STACK 8.4 subwoofer (8", 4+4 Ω, 500 W RMS, Qts 0.712, Vas ≈ 4.2 L, Fs ≈ 55 Hz) wants a compact, low-tuned ported box for deep daily use.

Here’s a design that’ll hit hard while keeping clean low end extension:

🔊 Ported Enclosure Design (Daily Bass / SQL Style)

Driver: Blurred Vision BV-4STACK 8.4 (8″, dual 4 Ω)

Tuning: 36 Hz

Power: 500 W RMS

Style: Daily music / deep punch

📦 Box Specs

Net Internal Volume-0.65 ft³ (18.4 L)

Tuning Frequency-36 Hz

Port Area-10 in²

Port Type-Slot port, L-shaped (inside box)

Port Dimensions-1.25″ wide × 8″ tall × 18″ long

Wall Material

¾″ (19 mm) MDF

Mounting Depth Clearance≥ 6″

📐 Cut Sheet (External Dimensions)

(Assumes ¾″ MDF and front-firing port/sub)

Front / Back (1)x14″W × 10″ H

Top / Bottom (1)x14″W × 12″ D

Sides (2)x10″H ×12″ D

Port Divider (1)-8″H × 18″ L (inside)

➡️ Final external size: ~

14″W*10″*H*12"D

➡️ Net volume after port & driver displacement: ≈ 0.65 ft³

➡️ Tuned to: ≈ 36 Hz

🎶 Performance Notes

Strong output 35–60 Hz, ideal for street or daily setups

Smooth roll-off below 30 Hz (safe for excursion)

Works great with 250–500 W RMS amps

If you like tighter punch, shorten the port to 14″ → tune ≈ 40 Hz