# Speaker Enclosure (Box) — Latest Diagrams

Construction drawings for the **3-way active** cabinet and the **single mid** sealed module.

> Dimensions below are a **starting template** for a ~280×900×350 mm tower with a 8″-class woofer, 4–5″ mid, and 1″ tweeter.  
> **VERIFY** cutouts, volumes, and port length against your driver datasheets (Fs, Vas, Qts, Sd) before cutting wood.

## Latest diagrams

| Diagram | PNG (preview) | SVG (editable / print) |
|---------|---------------|-------------------------|
| Front + side elevations | [`diagrams/speaker-box-3way-elevations.png`](diagrams/speaker-box-3way-elevations.png) | [`diagrams/box-elevations-latest.svg`](diagrams/box-elevations-latest.svg) |
| Internal cutaway | [`diagrams/speaker-box-cutaway-latest.png`](diagrams/speaker-box-cutaway-latest.png) | [`diagrams/box-cutaway-latest.svg`](diagrams/box-cutaway-latest.svg) |
| Single mid sealed box | [`diagrams/speaker-box-single-mid.png`](diagrams/speaker-box-single-mid.png) | [`diagrams/single-mid-box.svg`](diagrams/single-mid-box.svg) |

## Target volumes (net, after bracing/driver displacement)

| Chamber | Type | Typical net volume | Notes |
|---------|------|--------------------|--------|
| Woofer | Bass-reflex | 35–50 L | Tune Fb ≈ 0.7–1.0×Fs; example port Ø50 × 150 mm — **recalculate** |
| Mid | Sealed | 6–10 L | Must be airtight vs woofer chamber |
| Tweeter | — | — | Closed-back dome needs no chamber; leave small recess only |

## Panel cut list (18 mm MDF example, external 280×900×350)

| Panel | Qty | Size (mm) | Notes |
|-------|-----|-----------|--------|
| Baffle (front) | 1 | 280 × 900 | Prefer 22–25 mm for rigidity |
| Back | 1 | 280 × 900 | Terminal cups / cable glands |
| Sides | 2 | 314 × 900 | Depth = 350 − baffle − back if overlapping; adjust for joinery |
| Top / bottom | 2 | 244 × 314 | Fit between sides (dado/biscuit preferred) |
| Mid shelf (×2) | 2 | ~244 × ~290 | Forms sealed mid chamber |
| Braces | 2–4 | window | Window braces in woofer volume |

Exact side/top sizes depend on butt vs rabbet joints — draw a full-size story stick before cutting.

## Build order

1. Cut panels; dry-fit shelves for mid volume.  
2. Cut driver holes from datasheet templates; counterbore for flush mount.  
3. Glue carcass + mid chamber; seal all joints (silicone/caulk inside).  
4. Install binding posts / Speakon; keep mid and woofer wiring separate.  
5. Stuff mid chamber lightly; line woofer walls (leave port clear).  
6. Mount drivers with gasket tape; measure for air leaks.

## Active system wiring

Each driver gets its **own amp channel** after the LR4 crossover (`active-crossover/`).  
No passive crossover network is required inside the box.

See also: [`../single-mid/`](../single-mid/) for mid-only amp + box package.