Sealed 2-way monitor — Dayton RS225 + Seas 27TBFC
Dayton Audio RS225-4 + Seas 27TBFC/G H1212-06 · 22 L sealed box · 2-way Linkwitz-Riley 4th-order at 2.2 kHz
Drivers
- WooferDayton Audio RS225-4×14 Ω · Fs 33 Hz
- TweeterSeas 27TBFC/G H1212-06×16 Ω · Fs 550 Hz
Crossover
| Type | Linkwitz-Riley |
| Slope | 24 dB/oct (4th order) |
| Crossover point | 2.2 kHz |
Tune component values in the crossover designer.
Compatibility check
ValidatedThis recipe passes the Sine Design compatibility engine with no errors — the enclosure alignment and crossover are sensible for these drivers. Notes below are informational.
About this design
A larger sealed two-way built around the 8" Dayton RS225-4 aluminium-cone woofer. 22 L lands a Qtc of ~0.72 (Fc ~58 Hz, F3 ~57 Hz) — near-textbook 0.707 for clean transient response. The Seas 27TBFC metal-dome tweeter takes over at 2.2 kHz on LR4. The RS225 is a low-distortion reference woofer; budget baffle-step in the crossover.
Want to change a driver, the box size or the crossover point? Open this recipe in the builder — every slot is pre-filled, and the live compatibility check follows your edits. Published Thiele/Small parameters are nominal; measure your drivers (DATS/REW) and model the final cabinet before building.
Estimated parts list
| Part | Qty | Est. | Buy |
|---|---|---|---|
| Dayton Audio RS225-4 | 1 | — | Parts Express → |
| Seas 27TBFC/G H1212-06 | 1 | — | Parts Express → |
| 0.47 mH air-core inductor (L3 series) | 1 | $6 | Parts Express → |
| 27 µF film capacitor (C3 shunt) | 1 | $3 | Parts Express → |
| 0.22 mH air-core inductor (L4 series) | 1 | $6 | Parts Express → |
| 6.8 µF film capacitor (C4 shunt) | 1 | $3 | Parts Express → |
| 6.8 µF film capacitor (C1 series) | 1 | $3 | Parts Express → |
| 0.22 mH air-core inductor (L1 shunt) | 1 | $6 | Parts Express → |
| 12 µF film capacitor (C2 series) | 1 | $3 | Parts Express → |
| 1 mH air-core inductor (L2 shunt) | 1 | $6 | Parts Express → |
| Binding-post terminal cup | 1 | $6 | Parts Express → |
| Acoustic damping / polyfill (~220 g) | 1 | $9 | Parts Express → |
| Cabinet panel stock (MDF/ply) for ~22 L net | 1 | $45 | local |
| Fasteners, gasket & sealant | 1 | $6 | local |
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