Backes&Muller BM18
¥ 3,600,000 (a set of two cars, around 1995)
Commentary
This active speaker system was developed by inheriting the design philosophy of the flagship model BM30.
The Bucks & Mueller active speaker system incorporates feedback that compares the input and output signals to compensate for distortion, including the physical vibration of the enclosure.
The low-mid range unit uses inductive negative feedback, which corrects the voltage generated between the sensor attached to the diaphragm and the magnetic field of the unit by comparing it with the original signal, while the high-range unit uses capacitive negative feedback, which compares the voltage between the diaphragm and the grid with the original signal.
The BM18 consists of six 5-way units with two 25 cm cone woofers in the low range, a 20 cm cone mid-bus unit in the middle range, a 13 cm cone mid-range in the middle range, a 3.7 cm dome tweeter in the high range, and a 1.9 cm dome super tweeter in the ultra high range.
The same units and control circuits as those of the BM30 are used.
It comes with a PPG (Sound Level Program Digital Cable Remote Control) that can adjust the sound level of individual units.
With this remote control, you can control the sound level of each unit within ± 8 dB. You can preset up to two different sound levels. The shape of the remote control allows you to adjust the sound level in the listening position. You can switch between three different sound levels in combination with the preset original sound level.
Tuning is done directly in the frequency network, and the remote control and cable handle only the tuning signal, preventing degradation of the music signal.
The exterior finish comes in Walnut Natural, Oak Natural and Oak Black variations.
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Model Rating
| Method | Built-in Amplifier / 5-way / 6-speaker / Floor Type |
| Speaker Unit | |
| Units Used | For low band : 2 x 25 cm cone type (with inductive feedback system) For Middle and Low Band : 20 cm Cone Type (with inductive feedback system) For Middle Range : 13 cm Cone Type (with inductive feedback system) For High Range : 3.7 cm Dome Type (with Capacitive Feedback System) For Super High Band : 1.9 cm Dome Type (with Capacitive Feedback System) |
| Amplifier Unit | |
| Effective power | Bipolar High Level Stage : 6 x 130W (4 Ω) |
| Input terminal | Balanced / unbalanced XLR connectors |
| Pwer | 100 VAC, 50Hz/60Hz |
| Guaranteed operation | 90 V ~ 110 V |
| <Others> | |
| External dimensions | Width 300x Height 1,450x Depth 420 mm (+ 60 mm Heat Sink) |
| Weight | 82kg |
| Accessories | PPG (2 sound-level programmable digital cable remote control / connection cable) Two power cables Two line cables (XLR-XLR) Two line cables (XLR-RCA) |