1) Start With Your Goal: SQ, SPL, or Hybrid

SQ (Sound Quality)

Built for clean, accurate bass with strong control and smooth response. SQ builds often prioritize:

• Tight transient response

• Balanced low end

• Clean integration with midbass

SPL (Output / Loud)

Built to maximize output and low-frequency impact. SPL builds typically require:

• More space

• Strong bracing

• Precise port design/tuning

• Correct power handling and electrical setup

Hybrid (Daily Driver + Loud)

Balanced design for clean sound and strong output—one of the most popular goals for real daily drivers.

2) Sealed vs Ported: What You’re Really Choosing

Sealed Enclosures (Tight & Controlled)

Best for:

• Accurate bass

• Smaller spaces

• Smooth response across a wider range

• Simpler, durable daily-driver builds

Tradeoff:

• Usually less peak output than a properly designed ported build

Ported Enclosures (More Output & Deep Extension)

Best for:

• Higher output

• Strong low-frequency extension

• Builds focused on “feel it” bass

Tradeoffs:

• Requires more internal volume

• Port must be engineered properly (shape, length, area)

• Poor port design can cause port noise, boominess, or weak output

3) Airspace Volume: The #1 Spec People Get Wrong

Subwoofer manufacturers recommend a specific internal airspace range. If the box is too small or too large, you can experience:

• Weak low end

• Distortion or uncontrolled cone movement

• Reduced efficiency (wasted amplifier power)

• Higher risk of heat stress and failure

We design around:

• Manufacturer specs (when available)

• Real vehicle constraints

• Your target sound goal

4) Port Tuning: Where Performance Is Won or Lost

Port tuning determines how low the system plays and where it “hits” hardest.

General tuning behavior:

• Higher tuning = stronger “punch” but less deep extension

• Lower tuning = deeper low end and smoother extension (often needs more space)

Port design also controls air velocity. A bad port can cause:

• chuffing/noise

• reduced output

• ugly frequency response peaks

5) Vehicle Fitment Is Real Engineering

Fitment isn’t just width/height/depth. Real-world constraints include:

• Seat travel

• Seat rails and brackets

• Factory jack storage and side panels

• HVAC vents / wiring channels under seats

• Trunk opening clearance (you can build a box that won’t fit through the opening)

• Rear seat folding mechanisms

• Mounting depth vs magnet size

This is why we request photos and measurements for many builds.

6) Materials & Build Quality

We build with performance durability in mind:

• Proper MDF thickness

• Reinforced bracing

• Precision cuts and strong joints

• Sealing methods to prevent air leaks

• Hardware/terminal mounting integrity

A box that flexes leaks output. A box that leaks air loses control.

7) What We Need From You (So We Build It Right)

For best results, have these ready:

• Vehicle year/make/model/trim

• Install location (under-seat / trunk / cargo / custom)

• Subwoofer brand/model + mounting depth

• Quantity (1, 2, etc.)

• Your goal (SQ / SPL / hybrid)

• Amplifier RMS power

• Space measurements OR photos with tape-measure shown

If you don’t know some specs, that’s okay—send what you have and we’ll guide you.