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| BP-SD21, 21" Band Pass Subwoofer - The Sub Engine |
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Our BP-SD21, The Sub Engine has the low frequency output to match its eye-catching appearance. It boasts folded-horn output from a box one half the size of one of our WH folded horns. The 21" low frequency driver has the lowest power compression we have ever measured thanks to its massive magnet structure and huge 6" diameter voice coil. Each BP-SD21 is capable of handling 2,000 Watts program power. This speaker has been turning heads with the output equal to a typical double 18" box, but it is nearly as small as a usual single 18" box.
Also available, the BP-SD18 Sub Engine Jr., an impressive 18" version of the same concept. |
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back view and front mounting castor board |
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| When six of the BP-SD21 Sub Engines were used at the 2009 FAMU Homecomming Hip Hop Concert for a ten-thousand person audience the engineer, Reuben James, started off the show using six BP-SD21s and eight double 18" subs. However, early in the show he started turning the double 18"s down and the BP-SD21s up. Eventually he left the double 18"s turned off and did the rest of the show, including the main hip hop act ("Plies"), with the six BP-SD21 Sub Engines. Reuben James made a comment to us that he had never heard so much 30 Hz information out of six single enclosures of that size. He loved the unique bass sound they produced. He said that he was 200 feet away and his shirt sleeves were fluttering. |
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| Specifications: |
| System Type |
4th Order Vented Band Pass |
| Active or Passive |
Passive |
| Program Power ( Watts ) |
2000W |
| Bi-ampable |
Electronic Crossover Recommended 4th Order at 35 Hz to 80 Hz |
| Nominal Impedance (Ohms) |
8 Ohms |
| Sensitivity (dB @ 1Watt/1m) |
106 dB* |
*notes:
- Measurement Made Using 2.83 Volt, 4th Order, Band-limited Pink Noise from 38 - 80 Hz
- One Cabinet Measured 106 dB and Two Cabinets In Parallel at four Ohms were measured to be 109 dB
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| Max SPL (dB) |
138 |
| Frequency Response (Hz +/- 3dB) |
38 Hz - 80 Hz |
| Crossover Frequency (Hz) |
80 Hz Low Pass |
| Driver Configuration |
Single 21" Woofer with field-replaceable basket |
| LF Driver(s) |
Single 21" Woofer with 6" Voice Coil |
| LF Program Power ( Watts ) |
1000 W Continuous, 2000 W Program |
| LF Impedance (Ohms) |
8 |
| Inputs - Speakon Neutrik 4-pin |
Dual NL4 , Paralleled |
| Corners |
Optional |
| Feet |
Yes |
| Flying Hardware |
Optional |
| Wheels |
Yes |
| Bar Handles |
4 |
| Enclosure Materials |
3/4" to 1/2" Multi-Ply Birch |
| Grille |
16 Ga. Perforated Steel |
| Finish / Covering |
Black Catalyzed Paint |
| Optional Finish / Covering |
Highly durable DuraBlast polyurea coating. Click to learn more |
| Dimensions (DWH xback W, inches) |
30" x 24.5" x 30" |
| Dimensions (DWH xback W, cm) |
76 x 62 x 76 |
| Weight (lbs/kg) |
168 lbs / 76 kg |
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