How To Pull Your Measurements

Measure the vehicle space so we can design blueprints that fit. Keep seats, trim, and storage in the positions you intend to use. Choose the build type below for its specific checks.

Measurement Rules

  • Height: top to bottom. Width: driver side to passenger side. Depth: front to back.
  • Measure the maximum space you can actually use. Do not reduce it for appearance alone; tell us which dimensions you prefer to keep or reduce.
  • Follow the units requested by the form. Keep one unit system throughout, label inches or millimeters on every drawing, and state any metric dimensions in Custom Requests. Do not mix unlabeled measurements.
  • For a rectangular fit, use the smallest usable measurement across the whole footprint. Check the top, bottom, and both sides.
  • For an angled or notched fit, choose Complex where offered. Send multiple dimensions and labeled front, side, and top sketches showing wheel wells, humps, brackets, and steps.
  • Verify the closed hatch/lid, normal seat travel and recline, and the path used to install the finished enclosure. A cardboard mockup helps confirm tight fits.

Clearance: Space Versus Box Dimensions

First measure the full space. Then reserve room for cone movement and an unobstructed port outlet. State in Custom Requests whether your submitted dimensions already exclude those clearances. If you submit full raw space instead, explicitly ask us to reserve the necessary clearance. Do not leave us guessing.

  • Subwoofer clearance: allow space for the surround, grille, excursion, and nearby trim. EZ DB’s planning preference is roughly half the driver diameter, rounded up: 10-inch → 5 inches; 12-inch → 6; 15-inch → 8; 18-inch → 9. The actual requirement depends on the installation.
  • Slot-port clearance: keep at least the smaller port-opening dimension clear in front of the mouth; roughly 1.5 times that is a useful planning allowance. For a 4 × 45-inch mouth, that means at least 4 inches, preferably about 6.
  • You do not know final port dimensions before design. Send the available clearance, or label your measurements as raw space so we can work it out.
  • Bandpass drivers are internal, so vehicle-side clearance is primarily around the output port. Still allow internal driver movement and service access.

Tools and Sketches

Use a tape measure, a simple sketch, and optional cardboard. Label each measurement and its endpoints. Obstruction photos help when marked with dimensions; they do not replace a measured drawing.

Choose Your Build Type

Sedan Trunk — Sub Back / Port Back

Both outputs face the rear of the sedan.

Measure

  • Height: floor to the underside of the rear deck at the enclosure position. Check hinges and struts with the lid closed.
  • Width: the narrowest usable width, usually between wheel wells. For Complex, also label wider sections and their positions.
  • Depth: check at the top of the intended space, at the far left and right. An angled seatback or curved rear boundary can make a center or floor reading falsely generous. Use the shallowest reading for Rectangular.
  • Installation path: for a slide-in enclosure, also measure the trunk opening and test the actual entry angle. A build-in enclosure still needs panel assembly and tool access.

Check Before Submitting

  • Reserve clearance between the outputs and the closed lid/rear trunk boundary.
  • Mark spare-tire humps, factory amps, hinges, and anything that stays in the space.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Sedan Trunk — Sub Forward / Port Forward

Both outputs face the cabin through the rear-seat opening.

Measure

  • Height: floor to the underside of the rear deck at the enclosure position. Check hinges and struts with the lid closed.
  • Width: the narrowest usable width, usually between wheel wells. For Complex, also label wider sections and their positions.
  • Depth: check at the top of the intended space, at the far left and right. An angled seatback or curved rear boundary can make a center or floor reading falsely generous. Use the shallowest reading for Rectangular.
  • Installation path: for a slide-in enclosure, also measure the trunk opening and test the actual entry angle. A build-in enclosure still needs panel assembly and tool access.

Check Before Submitting

  • Check the folded/removed rear-seat opening, remaining brackets, child-seat anchors, and upper-corner factory bracing.
  • Measure the unobstructed path into the cabin. Include any intended trim/seal treatment in Custom Requests; do not assume a folded seat provides unlimited clearance.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Sedan Trunk — Sub Forward / Port Side

The sub faces the cabin; the port exits toward the driver or passenger side.

Measure

  • Height: floor to the underside of the rear deck at the enclosure position. Check hinges and struts with the lid closed.
  • Width: the narrowest usable width, usually between wheel wells. For Complex, also label wider sections and their positions.
  • Depth: check at the top of the intended space, at the far left and right. An angled seatback or curved rear boundary can make a center or floor reading falsely generous. Use the shallowest reading for Rectangular.
  • Installation path: for a slide-in enclosure, also measure the trunk opening and test the actual entry angle. A build-in enclosure still needs panel assembly and tool access.

Check Before Submitting

  • Identify the port-exit side in Custom Requests.
  • Measure side clearance to the wheel well or trim at the intended outlet. Side-firing layouts depend on that clear path; no direction is automatically loudest in every vehicle.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

B-Pillar Wall

Use the space behind the front seats of an SUV or suitable vehicle, up to the roof/headliner.

Measure

  • Height: floor to headliner at the intended wall position.
  • Width: top and lower widths, plus the narrowest wheel-well or trim width.
  • Depth: usable space behind the front seats to the closed rear boundary. Check both upper and lower depth.
  • Seat position: use the actual driving position and recline range; include cone/port clearance in front of the wall.

Check Before Submitting

  • Mark roof taper, floor transitions, wheel wells, pillars, and seatbelt hardware.
  • Ported walls need clear cone and port paths; bandpass walls need a clear cabin-facing port path. A full-height complex space needs labeled drawings.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

C-Pillar Wall

Use the space behind the second-row seats of an SUV or van, up to the roof/headliner.

Measure

  • Height: cargo floor to headliner at the wall position.
  • Width: top, lower, and narrowest wheel-well widths.
  • Depth: second-row seatbacks to the closed hatch, checked at upper and lower heights.
  • Seats: identify bench or captain’s chairs and their normal travel/recline.

Check Before Submitting

  • A top port may clear a bench; a center port may fit between captain’s chairs. Measure the actual opening instead of treating either layout as guaranteed.
  • Mark seat/headrest clearance, rear-glass slope, hatch intrusion, floor steps, and wheel wells.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

SUV No-Wall — Subs Up / Port Back

Use the cargo space behind the rearmost row of seats that remains in use.

Measure

  • Height: load floor to the bottom edge of the rear side glass, not the headliner. This is the no-wall box-body height limit.
  • Width: narrowest usable width, normally between wheel wells. Give additional widths for Complex.
  • Depth: rearmost upright seatbacks to the closed hatch.
  • Clearance: reserve open air above the cones and behind the rear-facing port.

Check Before Submitting

  • Folded third-row seats change the load floor. Mark their height, storage lids, cargo-cover mounts, and factory electronics.
  • Keep cargo out of the output paths.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

SUV No-Wall — Subs Up / Port Up

Use the cargo space behind the rearmost seats, with both outputs facing upward.

Measure

  • Height: floor to the bottom edge of the rear side glass. Do not use the roof as the box-height limit.
  • Width: narrowest usable width, including wheel wells and trim.
  • Depth: rearmost upright seatbacks to the actual closed hatch/glass boundary.
  • Above the box: measure the open clearance toward the headliner or any cargo cover.

Check Before Submitting

  • This can help when there is insufficient room for a rear-facing port, but upward outputs still need clear air.
  • Do not place cargo over the cones or port. Record hatch/glass taper and folded-seat floor changes.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Truck — Under-Seat

Measure beneath the rear seat with it down in its normal seating position.

Measure

  • Front height: local floor to cushion underside at the front edge of the rear seat.
  • Back height: local floor to cushion underside at the back edge. Measure separately; either end may be more restrictive.
  • Width: usable side-to-side width beneath the rear seat.
  • Depth: from the rear-seat cushion’s front edge to the back of the usable under-seat area, not from the front-seat back.

Check Before Submitting

  • Label floor humps, brackets, seatbelt anchors, HVAC ducts, storage bins, and wiring. Use measured photos/sketches for irregular areas.
  • Check cone clearance in the selected Forward, Upfire, or Downfire direction, and outlet clearance for the selected port location.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Truck — Behind-Seat

Measure between the seatback and rear cab wall with the seat upright and in use.

Measure

  • Height: cab floor to the bottom of the rear window.
  • Width: usable cab width at the enclosure location.
  • Depth: seatback to cab trim at upper and lower heights. Draw curved or tapered spaces.

Check Before Submitting

  • Include recline hardware, brackets, headrests, seatbelt equipment, factory electronics, and cone clearance.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Truck — Center Console

Measure the intended space between the driver and passenger seats.

Measure

  • Height: floor or retained console base to the chosen console-top limit. The ceiling is not the limit.
  • Width: usable gap between seats in their normal driving positions, including adjustment travel.
  • Depth: dashboard boundary to the intended rear edge.

Check Before Submitting

  • Locate shifter, parking brake, cupholders, vents, seatbelt latches, wiring, and control access on the sketch.
  • Keep required seat movement, controls, and airbag deployment areas clear.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

Truck — Blow-Thru (4th or 6th Order)

Measure the bed enclosure space and the separate cab connection. Both alignments use the same fitment checks.

Measure

  • Enclosure space: usable bed height, width, and depth, including wheel wells, tonneau/bed cover, trim, and service access.
  • Port projection: from the enclosure’s front face to the back wall of the cab where the outlet must finish flush. Include the connection and sealing arrangement.
  • Bottom and top elevations: use one bed-floor datum to measure minimum bottom-of-port height and maximum top-of-port height. Their difference gives the available vertical opening.
  • Port width: usable left-to-right opening width after allowing for seals and obstructions.

Check Before Submitting

  • Upload labeled bed and cab-opening sketches, including offsets and any irregular shape.
  • Agree on the design and installer’s modification plan before cutting the cab or bed. Include weather protection and vehicle flex in the installation plan.

Clearance note: state in Custom Requests whether these dimensions already reserve output clearance or describe the full raw space.

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