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Active Bass Loudspeaker BASIS 3.
The active bass loudspeakers BASIS 3 serves its purpose to complement lower octaves to the RL903, RL904, RL906 studio monitors and also as the main subwoofer for 5-channel audio playback. The speaker is fully equipped with all necessary connections; so it allows a flexible integration in surround-sound systems. Not only the three front channels left, middle, and right but also both rear surround-channels pass through a High-pass filters at 80 Hz. All 5 channels lower frequency range and the LFE-signal are added up, whereat the LFE-signal can be adjusted separately. The BASIS 3/4K features by phase correction. In a range from 0 to 1 meter the distance between the plane of the front speaker's radiation and the BASIS 3/4K can be compensated. A switch enables a HPF to limit the frequency response from 28 Hz to 40 Hz. The power amplifier is designed on MOSFET-technology. A frequency-dependent protection with RMS detection keeps the driver from overloads. A specially developed long-throw bass driver, which is able to linear displacement of ą 20 mm, ensures a low-frequency transducing with very low distortion by this way the localization of the sub-bass in the room minimized. To achieve the optimal characteristics of the puls we use a closed cabinet for the loudspeaker. The system can be set in a bypass-mode by using a cable-connected remote-control. Thereby all 5 output channels get routed directly to their input signals - the bass channel is disconnected. The control- and the power-unit as well as all connections and controllers are attached to the cabinet's backside. A two-colored LED on the front side indicates the state of the amplifier and warns of clipping. We optionally offer the speaker in a magnetically-shielded version. For the use in mobile broadcast vans or for frontal installations in a wall we also supply all the electronics in a separate box.
Technical properties
| General |
Complement of low frequencies for the reproduction of the multi channel formats
2/0; 3/2; 5.1; 7.1 and Dolby Surround(3/1) |
| Cabinet design |
closed-box |
| Maximum SPL |
115 dB / r =1m ( 3.3 ft ); 2pi |
| Bandwidth with HPF |
28 Hz...80 Hz; 2pi
40 Hz ...80 Hz; 2pi |
| Inherent noise sound level |
GK0 / DIN 15996 r=1m |
| Total harmonic distortion measured at 96 dB, r=1m ( 3.3 ft );2pi; from 40 Hz ...90Hz |
Dk2<-25dB / Dk3<-34dB |
Nominal Input level
L,M,R,SR,SL
LFE-channel |
+ 6 dBu adjustable
- 4 dBu adjustable |
| Input impedance |
>= 10 kOhm RC symmetrically |
Nominal Output level
L,M,R,SR,SL |
+ 6 dBu an 2 kOhm symmetrically |
| Bass output level |
adjustable |
| Electronic Crossover frequencies |
TP 24 dB/Okt. ft=80Hz
HP 12 dB/Okt. ft=80Hz |
| Distance compensation |
adjustable from 0...1m ( 3.3 ft )difference
to the front speaker's plane |
| Nominal output power of the MOSFET-amplifier |
550 Watt 4 Ohm |
| Input Connector |
5 x XLR 3F |
| Output Connector |
5 x XLR 3M |
| Connector for bypass-mode switch |
XLR 4M |
| Loudspeaker systems |
320 mm ( 12.5" ) cone |
| Operation and Clipping indicator |
LED on front side |
| Power requirements |
Europe 230 Volt(ą 10%), AC, 50 Hz
USA & Canada 120 Volt, AC, 60 Hz |
| Power consumption |
max. 850 Watt at full load |
| Mains Connection |
Euro cold-unit connector |
| Dimensions (H x W x D) |
400 x 400 x 400 mm ( 15.7 x 15.7 x 15.7 in ) |
| Weight |
31 kg ( 68 lbs) |
Temperature requirements
for use
for storage
Humidity |
+ 15°C .... + 35°C ( 59°F .... 95°F )
- 25°C .... + 45°C ( -13°F .... 113°F )
45 .... 75 % |
| Magnetic shield |
optional |
| Design of the Cabinet |
MDF wood, black veneer,
different colors optional |
|
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| Free field frequency response r=2m ( 6.6 ft ) |
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| Total harmonic distortion PA=96db |
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| block diagram |
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