beyma Low Frequency Transducer Instructions
KEY FEATURES
- High sensitivity: 98 dB
- High power handling: 400 WAES
- 3” copper voice coil
- Optimum winding length for increased linear excursion.
- Extremely linear frequency response
- Extended response in the medium frequency range
- Low harmonic distortion
- High power woofer and midbass applications
TECHNICAL SPECIFICATIONS
| Nominal diameter | 380 mm 15 in |
| Rated impedance | 8 Ω |
| Minimum impedance | 7,2 Ω |
| Power capacity 1 | 400 WAES |
| Program power 2 | 800 W |
| Sensitivity | 98 dB 1W / 1m @ ZN |
| Frequency range | 35 – 3.000 Hz |
| Recom. enclosure | Vb = 75 l |
| (Bass-reflex design) | Fb = 48 Hz |
| Voice coil diameter | 76,2 mm 3 in |
| Bl factor | 17,4 N/A |
| Moving mass | 0,086 kg |
| Voice coil length | 17,5 mm |
| Air gap height | 7 mm |
| Xdamage (peak to peak) | 30 mm |
Notes:
- The power capaticty is determined according to AES2-1984 (r2003) standard.
- Program power is defined as power capacity + 3 dB.
- T-S parameters are measured after an exercise period using a preconditioning power test. The measurements are carried out with a velocity-current laser transducer and will reflect the long term parameters (once the loudspeaker has been working for a short period of time).
- The Xmax is calculated as (Lvc – Hag)/2 + (Hag/3,5), where Lvc is the voice coil length and Hag is the air gap height.
THIELE-SMALL PARAMETERS3
| Resonant frequency, fs | 35 Hz |
| D.C. Voice coil resistance, Re | 6,4 Ω |
| Mechanical Quality Factor, Qms | 8,5 |
| Electrical Quality Factor, Qes | 0,40 |
| Total Quality Factor, Qts | 0,38 |
| Equivalent Air Volume to Cms, Vas | 267 l |
| Mechanical Compliance, Cms | 243 µm / N |
| Mechanical Resistance, Rms | 2,2 kg / s |
| Efficiency, η0 | 2,7 % |
| Effective Surface Area, Sd | 0,088 m2 |
| Maximum Displacement, Xmax 4 | 7,25 mm |
| Displacement Volume, Vd | 638 cm3 |
| Voice Coil Inductance, Le | 1,2 mH |
Note: Frequency response measured with loudspeaker standing on infinite baffle in anechoic chamber, 1W @ 1m
MOUNTING INFORMATION
| Overall diameter | 388 mm | 15,3 in |
| Bolt circle diameter | 370 mm | 14,6 in |
| Baffle cutout diameter: | ||
| Baffle cutout diameter: | 352 mm | 13,9 in |
| Depth | 156 mm | 6,1 in |
| Net weight | 6,5 kg | 14,3 lb |
| Shipping weight | 7,4 kg | 16,3 lb |
DIMENSION DRAWING
Documents / Resources
 | beyma Low Frequency Transducer [pdf] Instructions Low Frequency Transducer, SM-115 N |
