RAAL 70-20XR Ribbon Tweeter
Best box: 0.2 L sealed · Fc 231.8 Hz · F3 234.3 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the RAAL 70-20XR Ribbon Tweeter against your space and targets — instant, no sign-up.
Estimated retail 629.95 EUR · Check price & availability ↗
Free, no sign-up to simulate · a free account saves your design
Comparable 1.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the RAAL 70-20XR Ribbon Tweeter does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- Limited linear excursion (Xmax: 1.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (3.3 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 129.3 Hz |
| F3 (-3 dB Cutoff) | 119.2 Hz |
| F6 / F10 Extension | 112.7 Hz / 104.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 19.9 cm |
| First Pipe Resonance | 865.0 Hz |
| Estimated MOL @ F3 | 85.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 231.8 Hz |
| F3 (-3 dB Cutoff) | 234.3 Hz |
| F6 / F10 Extension | 177.2 Hz / 133.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 150.0 Hz |
| Total Q (Qts) | 0.45 |
| Electrical Q (Qes) | 0.536 |
| Mechanical Q (Qms) | 2.8 |
| Equivalent Volume (Vas) | 0.3 Liters |
| Diaphragm Area (Sd) | 8.5 cm² |
| DC Resistance (Re) | 0.2 Ω |
| Efficiency Bandwidth Product (EBP) | 279.8 |
| Linear Excursion (Xmax) | 1.0 mm |
| Thermal Power (Pe) | 80.0 W |
| Nominal Diameter | 1.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for RAAL 70-20XR Ribbon Tweeter?
A simple ported box is not recommended for RAAL 70-20XR Ribbon Tweeter: the textbook alignment (1.5 liters tuned to 129.3 Hz) needs a 19.9 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can RAAL 70-20XR Ribbon Tweeter be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 234.3 Hz.
What port dimensions should be used for RAAL 70-20XR Ribbon Tweeter to avoid port chuffing?
A straight 5.0 cm port would need 19.9 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
Not sure if 70-20XR Ribbon Tweeter fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space