Bose Direct / Reflecting 901 Series 4 - Manual (Page 17)

VI. Technical Information
A. SPECIFICATIONS
1. The system is packed In two cartons marked “Part 1”
and “Part 2.“
Shipping Weight: Part 1. 45.5 lbs. Part 2. 43.5 lbs.
Carton Dimensions: 25%" x 16" x
2. The Speaker
Dimensions: 21 " Wide x 12%" High x 13" Deep
Weight: 35 lbs. Impedance: 8 ohms
3. Percentages of Reflected and Direct Sound Radiation
Power radiated by reflection: 89%
Power radiated directly: il%
4. Power Handling
Minimum Recommended Power: 10 watts rms per channel
at 8 ohms.
Maximum Recommended Power: No power restrictions on
amplifier size when used in non-commercial applications,
providing the fusing recommendations are followed.
5. Speaker Configuration
SPATIAL CHARACTERISTICS: Eight speakers reflecting
sound at 30® angles from the wall behind the speaker; one
speaker directed into the listening area to provide the op­
timum ratio of reflected to direct sound and the proper
angles of the reflected sound incident upon the listener.
SPEAKER COMPLEMENT: Nine matched full-range speak­
ers, utilizing aluminum helically wound voice coils: linear,
high-excursion
suspension; low impedance (0.9 ohms)
voice coils connected in series.
ENCLOSURE: Acoustic Matrix'^“, utilizing three Reactive Air
Columns tuned below system resonance and partially
isolated individual cells for each driver; air columns
emerge through rear of speaker cabinet for maximum effi­
ciency.
6. The Active Equalizer
TAPE MONITOR SWITCH: Replaces tape monitor switch
on receiver or amplifier when equalizer is connected in
tape monitor circuit.
LOW FILTER CONTROL: Two-position. 5 dB decrease at
40 Hz.
SOURCE AND ROOM COMPENSATION
LOW FREQUENCY CONTROL: Continuously adjustable
slider, ± 8 dB adjustment over band from 100 Hz to 400 Hz.
HIGH FREOUENCY CONTROL: Continuously adjustable
slider, shelving control with range of ±8 dB at 10 kHz.
Dimensions:
Input impedance:
Harmonic distortion:
Noise (“A" weighted):
Minimum load impedance:
Maximum output voltage:
Maximum gain:
2^6* High X SXs' Deep x
Wide
80 kilohms
<0.1% (1.0-volt output)
90 dB below 1 volt
5 kilohms
2.5 volts
21 dB at 16 kHz (center
setting)
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