Sealed
Worth tryingFs, Qts and Vas allow a sealed-box calculation. Qts is below 0.707, so a Qtc 0.707 target may be explored; actual size and output limits still matter.
Fs 67 Hz · Qts 0.32 · Vas 16.9 LSica
Sica 8 Fe 2 CP-8
Woofer · 8″ · 8 Ω
Sica 8 Fe 2 CP-8: Woofer. Published Fs 67 Hz, Qts 0.32 , Vas 16.9 L. Explore these values before choosing an enclosure.
- Resonance Fs
- 67 Hz
- Nominal sensitivity
- 94.6 dB
- Rated power
- 200 W
- Excursion Xmax
- 4.5 mm
What this driver's data tells us
Sica 8 Fe 2 CP-8
Sica 8 Fe 2 CP-8 is a Woofer. Its available data describe the following design trade-offs.
With Fs 67 Hz, Qts 0.32 and Vas 16.9 L, an ideal maximally flat sealed reference (Qtc 0.707) is approximately 4.4 L, with a −3 dB cutoff of 148.1 Hz.
This reference is compact (up to 10 L); judge its usefulness together with the cutoff above.
The calculated sealed cutoff exceeds 90 Hz. This reference is better viewed as a satellite or midbass starting point than a deep-bass solution.
Qts 0.32 makes a vented alignment worth simulating. Choose volume and tuning together and check excursion; Qts alone cannot guarantee a good result.
Published sensitivity is 94.6 dB (1 W / 1 m). Sensitivity describes output for the stated input, not maximum usable sound pressure.
On an approximate 1 W / 1 m basis (94.6 dB), sensitivity is relatively high, giving more rated-band output for the same input power.
Basis and further reading
Calculated from published parameters; this is not a listening review. Box sizes are net acoustic volume for one driver. Room gain, EQ, damping material and construction losses are excluded.
Voltage-to-power conversion uses nominal impedance. These size, cutoff and sensitivity bands are editorial guides, not audio-quality standards.
Driver character card
Explore the stats
These bars show physical quantities, not sound-quality scores. A longer bar is not always better. Open a stat to learn what it means.
Resonance · Fs67 HzDisplay range: 10–2,000 Hz · log
The driver's free-air resonance. A lower value can help a bass design, but the enclosure, excursion and response determine usable bass. It is not the finished speaker's bass cutoff.
Sensitivity94.6 dBDisplay range: 65–115 dB
Output at the manufacturer's stated input and distance. 1 W and 2.83 V are different references for many impedances. This card keeps the original value and reference; it is not an efficiency or sound-quality rating.
Resonance damping · Qts0.32 Display range: 0–1.5
Electrical and mechanical damping combined. Lower values indicate stronger damping at resonance. It helps choose an enclosure alignment, but does not tell you whether the sound is fast, warm or detailed.
Suspension compliance · Vas16.9 LDisplay range: 0.1–1,000 L · log
The volume of air with the same compliance as the suspension. It is not a recommended box volume. Use it together with Fs and Qts.
Linear excursion · Xmax4.5 mmDisplay range: 0–30 mm
Published linear excursion. Definitions differ between manufacturers; verify one-way versus peak-to-peak values. It does not by itself predict distortion or maximum safe output.
Radiating area · Sd213.8 cm²Display range: 1–1,500 cm² · log
Effective radiating area, not the frame's outside diameter. It helps estimate how much air a cone moves when combined with excursion.
Sensitivity reference: 1W/1m
Which enclosure could work?
Screening guidance from the available parameters, not a guarantee. A manufacturer's exact-model enclosure plan takes priority. Listening quality cannot be ranked from T/S parameters.
Bass reflex
Worth tryingQts lies in a commonly explored low-to-moderate range. Try box volume and tuning together, and check the response, port speed and cone excursion below tuning.
Fs 67 Hz · Qts 0.32 · Vas 16.9 LTransmission line / quarter-wave
Needs careful designFs helps set a starting length, but taper, area, driver position and damping determine the result. There is no universal Qts pass/fail rule.
Fs 67 Hz · Qts 0.32Back-loaded horn
Needs careful designUse an exact-model manufacturer plan or a dedicated horn model. Qts alone cannot establish suitability. Throat, mouth, path and rear chamber must be designed together; this page does not simulate horns.
Fs 67 Hz · Qts 0.32Explore other enclosure types
Mass-loaded transmission line
Needs careful designThe line and outlet act together. Tube length, area, damping and port mass require a coupled model; a bass-reflex preset is not an MLTL design.
Fs 67 Hz · Qts 0.32Passive radiator system
Needs careful designPotentially useful when a practical port is difficult, but the passive radiator's area, mass, compliance and excursion must be matched separately.
Fs 67 Hz · Qts 0.32Double bass reflex
Needs careful designTwo chambers and two ducts interact. Check their combined resonances with the dedicated model; these parameters alone do not establish an advantage over bass reflex.
Fs 67 Hz · Qts 0.32Open baffle
Needs careful designFront and rear bass cancel without an enclosure. Panel size, equalization and excursion matter. Low Qts is not an automatic rejection when EQ is available.
Fs 67 Hz · Qts 0.32Basis and further reading
Bass mini-lab
Move the volume slider. Both curves use the same box volume; the bass-reflex tuning is adjustable.
Illustrative small-signal T/S models, not an optimized recommendation or a measured speaker. No room gain, diffraction, port losses, excursion limit or power compression is included. The initial tuning equals Fs and must be adjusted for a real build.
Read the graph as numbers
| Frequency (Hz) | Sealed (dB) | Bass reflex (dB) |
|---|---|---|
| 20 | -34.8 | -41.9 |
| 50 | -18.9 | -17.5 |
| 100 | -7.6 | -5.7 |
| 200 | -1.1 | -0 |
| 500 | -0 | 0.1 |
| 1000 | -0 | 0 |
Frequency response Response
Common scale for all drivers: 20–20,000 HzNo usable response data is recorded
Unavailable response data is not guessed or plotted.
What do published reviews say?
Attributed summaries, not our listening test or a consensus score. The enclosure, crossover, room and listening level affect each review. Exact model and impedance are checked.
No exact-model listening review has been verified for this page yet. We do not infer tonal quality from T/S parameters or borrow reviews of similar model names.
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