| Specification | Value | Unit | |
| Overall diameter | 82 x 82 | mm | |
| Cutout Diameter/Square | 64 x 64 | mm | |
| Min. frontplate thickness | 5 | mm | |
| Overall depth | 57 | mm | |
| Motor assembly depth | -- | mm | |
| Motor assembly diameter | -- | mm | |
| Screwfitting | DIN 7984 / Ø 4.50 | mm | |
| Terminal | +: 4.8 x 0.8 / -: 2.8 x 0.8 | mm | |
| Shipping weight (pair) | 1.1 | Kg | |
| Shipping box size (pair) | 130 / 130 / 190 | mm | |
BD 20-6-031 20 mm Diamond Tweeter
The BD20–6–031 is a 0.8 inch tweeter with ultra hard diamond dom in a 82 mm frontplate. As the dome breakup frequency is around 60 kHz, no damping cutouts are required. The unsurpassed rigidity of the diamond dome leads to most accurate conversion from electrical energy to sound pressure. An FEA optimized underhung motor design with vented aluminium voice coil former and neodymium magnet guarantees low energy storage and excellent heat transfer. The soft fabric surround and ferrofluid with high viscosity center the moving parts with excellent linearity.
We recommend the BD20-6-031 in an application above 2500 Hz.
Our diamond speakers are only sold to loudspeaker producers.
| Dome material | Diamond |
| Application | Tweeter |
| Overall diameter | 82 x 82MM |
| Cutout Diameter/Square | 64 x 64MM |
| Overall depth | 57MM |
| Motor assembly depth | -- |
| Motor assembly diameter | -- |
Main Features
underhung motor design
soft fabric surround
vented vc & pole piece
ferrofluid filling
2500 HZ - 60000 HZ
Mechanical Data
Thiele/Small Parameters
| Specification | Value | Unit | |
| Sensitivity (2.83V / 1m) | Spl | 89 | dB |
| DC-resistance | Re | 6.55 | Ohm |
| Resonance frequency | Fs | 1000 | Hz |
| Equivalent volume of air | Vas | - | ltr |
| Mechanical Q | Qms | 0.58 | |
| Electrical Q | Qes | 0.83 | |
| Total Q | Qts | 0.34 | |
| Effective piston area | Sd | 3.46 | Cm2 |
| Moving mass | Mms | 0.19 | g |
| Suspension compliance | CMs | 0.141 | mm/n |
| Mechanical resistance | Rms | 2.21 | Kg*s |
Voice Coil Parameters
| Specification | Value | Unit | ||
|---|---|---|---|---|
| Power handling | P | 120 | W | |
| Linear excursion | XMAX | +/-0.1 | mm | |
| Voice coil diameter | 19.4 | mm | ||
| Voice coil former material | Al | |||
| Voice coil material | Cu | |||
| Voice coil inductance | LE | 0.02 | mH | |
| Force factor | BL | 3.21 | N/A | |
| Motor type | underhung | |||
| Ferrofluid filling | Yes | |||
Frequency Response
Impedance [OHM]
Harmonic Distortion [%]
