TEBM28C10-4/A
                                                                                          Data Sheet
TEBM28C10-4/A Miniature BMR® Driver                                                          ✓RoHS
                                                                                                 COMPLIANT




Features                                                Description
   •   Full range: 100Hz – 20kHz
                                                        The TEBM28C10-4/A BMR® is an audio drive unit
   •   Wide directivity; 180°
                                                        with an extended frequency response and wide
   •   Nominal Impedance: 4 Ω                           directivity. It combines the benefits of Tectonic
   •   Baffle: 46mm OD                                  bending-wave technology and pistonic modes of
   •   Depth: 25.8mm                                    operation.
   •   Mass: 58g
                                                        The small form-factor is ideally suited for compact
Applications                                            products that require a full-range drive unit, room
   •   Smart IoT speakers                               filling sound and a high-performance acoustic
   •   Portable speakers                                solution.
   •   Sound bars and stands
   •   Conference speaker phone

Parameters

            Parameter                 Description            min       typ     max       Units
           Re           DC resistance                       -10%       4.40    +10%      Ohms
           Le           Inductance (@ 10kHz)                -10%       0.09    +10%       mH
           BL           Force factor                        -10%       2.87    +10%       Tm
           fs           Resonant frequency                  -20%       130     +20%       Hz
           SPL          Sound Pressure Level @ 1W, 1m         78        80      81        dB
           dDrv         Voice coil diameter                    -      19.05      -        mm
           Mms          Moving mass                         -10%        1.0    +10%        g
           Cms          Compliance                          -12%       1.50    +12%      mmN-1
           Rms          Suspension Loss                     -15%       0.31    +15%      Nsm-1
           Xmech max    Maximum coil excursion (p-p)           -        8.0      -        mm
           Sd           Effective piston area                  -       8.55      -        cm2
           VAS          Equivalent volume                      -       0.15      -         L
           Qms          Mechanical quality factor           -15%       2.74    +15%
           Qes          Electrical quality factor           -15%       0.45    +15%
           Qts          Total quality factor                -20%       0.39    +20%


Document No. DS-TEBM28C10-4/A revision 1.9                                                        Page 1 of 3
Tectonic Audio Labs, Inc.                                                                            TEBM28C10-4/A Data Sheet
Operating conditions

               Condition                                                                                     Value
               Power handling (IEC268-5 continuous, weighted pink noise, 2nd order HP filter)                 10W
               Preliminary operating temperature range                                                   -20 to 55° C
               Audio frequency range                                                                    100Hz to 20kHz




Measured Response – on axis SPL
         (dB) Level, Sound pressure                                                                         Impedance, Real (ohm)
    95                                                                                                                              50


    90                                                                                                                              45


    85                                                                                                                              40


    80                                                                                                                              35


    75                                                                                                                              30


    70                                                                                                                              25


    65                                                                                                                              20


    60                                                                                                                              15


    55                                                                                                                              10


    50                                                                                                                              5


    45                                                                                                                             0
         50              100           200                 500           1k             2k             5k           10k           20k
                                                                                                                   Frequency (Hz)



         Figure 1: Red: on-axis SPL at 1W/1m (1/3-octave smoothed/spliced/ anechoic measurement). Blue: Impedance




Measured Response – Sound power response (SWL) over frontal hemisphere
          (dB) Level, Power
    95


    90


    85


    80


    75


    70


    65


    60


    55


    50


    45
          20                50          100          200              500          1k           2k          5k          10k        20k
                                                                                                                    Frequency (Hz)


         Figure 2: Power Response calculated across -90 -> +90 degrees, 1W/1m, 1/3-octave smoothed, spliced at 1kHz



Document No. DS-TEBM28C10-4/A revision 1.8
                                                                                                                               Page 2 of 3
Tectonic Audio Labs, Inc.                                                                 TEBM28C10-4/A Data Sheet


Polar – off axis acoustic measurements in anechoic chamber at various frequencies

        Sound Pressure                                                0°
        Level (dB)


                                     +30°                                               -30°




                +60°                                                                                         -60°




                    80          70          60         50        40
        +90°                                                                                                        -90°
               85         75         65          55         45        35
                                                                           (deg)
                     1 kHz                                                     10 kHz
                     2.5 kHz                                                   12 kHz
                     5 kHz


                       Figure 3: Polar Response, angle/dB SPL, input level 1 Watt (1/3rd octave smoothing)

Outline Drawing




                                                      Figure 5: Nominal dimensions

                    Disclaimer: The information in this Data Sheet is subject to change without notification

                             Please see www.tectonicaudiolabs.com for Terms and Conditions of Sale



Document No. DS-TEBM28C10-4/A revision 1.9                                                                                 Page 3 of 3