Bose Model 501 speakers

The Bose Model 501 Direct/Reflecting speaker system incorporates a ten-inch woofer and two three-inch tweeters along with a unique Direct Energy Control allowing the speaker system to easily adapt to your listening room.

Utilizing the walls, ceiling, and floor of your listening room to reflect sound, the Model 501 creates a sense of spaciousness with a strong center image. By radiating the high-frequency sound through the side and front grille panels, the 501 simulates the proportion of reflected and direct sound experienced in the larger environment of a live performance.

The ten-inch woofer found in the Model 501 provides outstanding bass performance while providing a portion of the direct sound at middle range frequencies. The extra-long excursion suspension yields powerful low distortion bass reproduction.

The Model 501 Direct Energy Control adjust the percentage of Direct Sound radiated into the listening area. This control primarily affects the spatial distribution of high-frequency energy and can be used to compensate for speaker placement and listener taste.

 

 

Specifications

Spatial Characteristics :  the Model 501 utilizes Asymmetrical Design for optimum stereo reproduction with rear and side wall reflections. The tweeters, angled toward the rear walls, reflect sound energy into the main listening area. A Direct Energy Control provided with the outward-directed tweeter allows control of the spatial characteristics of the speaker system. The Model 501 is designed in mirror-image pairs for optimum stereo reproduction.

Speaker Configuration :

Woofer - One ten-inch acoustic suspension woofer utilizing a long-throw 1,5-inch diameter voice coil with 16-ounce magnet. Linear high-excursion suspension system provides high output capability.

Tweeter - Two three-inch, wide-range tweeters with extended low-frequency response for use with Direct Energy Control Flat Total Power Radiation to over 16 kHz

Enclosure -  A walnut grain vinyl clad, floor-standing loudspeaker with acoustic suspension design and acoustically transparent side panels.

Impedance :  The impedance of the Model 501 speaker system is conservatively rated at 4 Ω , hower, since the impedance of the Model 501 is substantially above 4 Ω  over all but a small portion of the frequency range high quality receivers can operate an additional pair of 8 Ω  speakers or a second pair of 501's (connected in parallel) with no difficulty.

Power handling:  The minimum recommended power - 20 watts rms per channel. Amplifiers rated over 50 watts can be used with the Model 501, however, each channel should be fused.

Dimensions (W x H x D):  14-1/2" x 24" x 14-1/2"

Weight:  42 lbs

Bose Model 601 loudspeakers

A New Direct/Reflecting Speaker of Outstanding performance, High Efficiency, Moderate Cost and Exceptional Versatility

The Model 601 is a totally new Direct/Reflecting loudspeaker fromBose. It employs a unique arrangement of six drivers in each enclosure (four tweeter, two woofers) to achieve a level of tonal accuracy and spatial realism comparable only to the world renownedBose 901 Series III.

These peformance qualities , along with high efficiency, moderate cost, and great versatility of speaker placement in practically any listening environment, make the Model 601 a loudspeaker of exceptional value.

The result is an open, spacious sound and feeling of realism which can not be achieved by conventional speakers with front mounted drivers beaming directly at the listener. Such conventional designs are aimed almost exclusively at producing accurate frequency response, while largely ignoring the spatial qualities so critical to the impact of a live performance. In the Model 601, these important spatial qualities are accurately reproduced through the careful positioning and orientation of all six drivers in each speaker enclosure.

The Concept Behind Bose Direct/Reflecting Speakers

Like the 901 Series III 9the most advanced development of Bose design concepts and state-of-the-art. Manufacturing techniques), the Model 601 is a Direct/Reflecting speaker system . It's designed to reflect the greater part of its sound output off the back and side walls of the room, surrounding the listener with the same kind of balance of reflected and direct sound experienced in a live performance.

The tweeters

Three tweters in each enclosure provide reflected sound, creating a feeling of spaciousness, while one tweeter radiates the smaller proportion of direct sound needed for a strong center image and crisp, sharply defined details.

Two of the tweeters are also positioned to radiate sound upward through the acoustically transparent top grille, thus avoiding interference from furniture in the room.

The Woofers

There are two 8-inch woofers in each Model 601 enclosure, one aimed forward and one angled upward, to contribute an important component of reflected sound. The use of two smaller woofers provides a cone area equal to that of a single much larger driver, while offering importantperformance benefits at low and middle frequencies.

Each high-output woofer is capable of better dispersion and smoother midrange performance than a larger woofer, while they work together to provide bass response of exceptional power and clarity.

Accuracy of Tonal balance

With all four tweeters covering the same upper frequency range and the two woofers covering the same lower range, small response irregularities of individual drivers are averaged and smoothed in a way that can not be duplicated using single drivers.

Efficiency

The Model 601 is also a highly efficient speaker that can deliver superior reproduction of all kinds of music using an amplifier or receiver having as little as 20 watts of power per channel

Technical Information

Spatial Charateristics

Asymetric design for optimum stereo reproduction utilizing rear and side wall reflections. Two woofers, one reflecting, one direct. Four tweeters angled toward the rear walls, side walls, and listening area. Two-Position Symmetry Control; Asymmetric - side directed tweeters receive greater high-frquency excitation than center-directed tweeters; Symmetric - for speaker placement without adjacent reflecting walls, all tweeters are equally excited. Designed in mirror-image pairs for stereo reproduction.

Speaker Configuration

Woofer :  two eight-inch, high-efficiency woofers utilizing long-throw, one-inch voice coils. Linear high-excursion suspension systems providing high output capability

Tweeter :  Four trhee-inch, high-sensitivity, wide-range tweeters

Enclosure :  A walnut veneer floor-standing loudspeaker with ported design and acoustically transparent top

Minimum Recommended Power:  15 watss RMS per channel at 8 Ω

Amplifier rated over 70 watts per channel are unnecessary for "live volume" reproduction.

Amplifiers over 50 watts per channel should be fused

Crossover Frequency:  2 kHz

Impedance:  8 Ω

Dimensions (W x H x D):  15" x 25,5" x 13"

Weight:  36 lbs

Bose Model 550 receiver

The new, moderately prieced Bose Model 550 AM/FM Stereo Receiver brings you Bose technology and research wrapped up in an affordable, innovative package. It includes a direct-coupled amplifier that delivers a solid 40 watts of RMS power per channel - enough to drive almost any loudspeaker. It has an excellent AM/FM tuner section for clean reception. And exclusive Bose Source and Room Compensation Controls let you adjust for recording characteristics and for room acoustics. These controls make it easy for you to remove mid-range boominess without losing your deep bass. Try that with a conventional receiver.

The Bose 550 Receiver is designed to drive any speakers that suit your taste and budget. And it contains a unique feature you'll really appreciate when you upgrade your system. More and more customers tell us their first loudspeakers are interim units and that one day they hope to invest in a Bose 901 Series Direct/Reflecting Loudspeakers System.

Ownwrship of the 550 Receiver brings that day much closer, because the receiver has a built-in 901 Active Equalizer that gives you a significant savings when you purchase 901 speakers.

Specifications

Power Output:  40 watts per channel (minimum RMS continuous power, with both channels driven into 8 ohms, T.H.D. less than 0,3% from 20 Hz to 20 kHz)

IHF power Bandwidth:  20 Hz - 20 kHz (both channel driven, T.H.D. less than 0,19%)

Intermodulation Distortion:  0,09% IHF (60 Hz /7 khzmixed 4:1 at rated output)

Total Harmonic Distortion:  0,09% from 0,5 to 40 watts

Frequency Response:  20 Hz - 20,000 Hz ±0,5 dB

Phono RIAA:  ±0,5 dB

Input Sensitivity/Impedance:

Phono :  2,75 mV/47 k Ω

Auxx, Tape :  150 mV/50 k Ω

Signal-to-Noise Ratio:

Phono :  76 dB (A weighted, below rated output, inputs shorted)

Amplifier:  87 dB (A weighted, below rated output, inputs shorted);  91  dB (A weighted, below rated output, min. Volume)

Channel Separation: 

Aux, Tape:  60 dB at 1 kHz

Phono :  55 dB at 1 kHz

Phono Overload:  100 mV

Loudness Control : 

8 dB at 100 Hz ±2 dB

6 dB at 12 kHz ±2 dB

Source Room Compensation Controls:

Low Filter:

-3 dB at 100 Hz

-7 dB at 20 Hz

Low Frequency Control

Narrow Position

±8 dB at 140 Hz (center frequency)

±1 dB at 20 Hz and 1 kHz

Wide Position

±3 dB at 350 Hz

±8 dB at 50 Hz

High Frequency Control

±8 dB at 15 kHz

±3 dB at 2,2 kHz

FM Tuner

IHF Usable Sensitivity: 

Mono :  2,0 µV (11,25 dBf)

Stereo :  3,5 µV (16,11 dBf)

50 dB Quieting Sensitivity: 

Mono :  3,8 µV (16,82 dBf)

Stereo :  40 µV (37,27 dBf)

Frequency Response:  30 Hz - 15 kHz  +1, -3 dB

Signal-to-Noise Ratio (65 dBf):

Mono :  65 dB

Stereo :  60 dB

Total Harmonic Distortion (65 dBf):

Mono :  0,25%

Stereo : 0,50%

Capture ratio:  1,9 dB

Alternate Channel Selectivity:  60 dB

Spurious Response Rejection:  80 dB

Image Rejection:  65 dB

AM Rejection:  50 dB

Stereo Separation (1 kHz):  40 dB

AM Tuner

20 dB Usable Sensitivity:  350 µV/M w /ferrite loopstick

Adjacent Channel Selectivity:  35 dB

Distortion:  0,9% 9400 Hz at 30% modulation)

Image Rejection:  37 dB

IF Rejection:  45 dB

Signal-to-Noise Ratio:  40 dB

Power Requirements:  120 Volts AC, 60 Hz or 240 Volts AC, 50 Hz

Power Consumption: 360 watts at rated power

AC Outlets:  1 x Switched, 1 x Unswitched ( 400 watt max)

Dimensions (W x H x D):  464 x 146 x 311 mm

Weight:  7 kg (15,5 lbs)

Bose Model 802 loudspeaker

Model 802 Loudspeaker System

The Bose Model 802 represents the most significant advance in professional loudspeaker systems since Bose first introduced its revolutionary Model 800. incorporating a number of major departures from traditional loudspeaker design, the 800 series has since become the standard among professionals who demand systems which produce the cleanest, most natural sound.

The Model 802 utilizes a multiple array of matched, full-range drivers. Their close acoustical coupling results in a smoothing and broadening of individual driver resonances, producing an unusually transparent and detailed sound. The full-range driver concept also eliminates the need for a crossover, thereby eliminating crossover coloration and yielding a sound which has exceptional clarity and realism.

In each Model 802 enclosure, the eight drivers are mounted on four separate facets for smooth dispersion. Dual reactive air columns greatly increase the bass output, while lowering distortion by reducing cone excursion at low frequencies. A unique impedance control circuit, internal to the cabinet, lowers the high-frequency power requirements by reducing the slope of the impedance - versus - frequency curve.

Excellent transient response is achieved though the use of relatively light cones powered by massive magnetic structures. The smooth frequency response and excellent spatial properties of the multiple-driver design also permit performers to work very close to the speakers without causing feedback problems.

Each driver incorporates an edge-wound, aluminum ribbon voice coil for exceptional efficiency and power-handling capacity.efficiency is further enhanced though the use of a 12-ounce ceramic magnet and a reinforced polymer frame, which reduces magnetic flux leakage.

Matched equalization not incorporated into other professional loudspeaker systems, is tailored to the acoustics of the Model 802 and assures full frequency range performance. The new Model 802-E active equalizer provides extremely detailed equalization for smooth, wide response. Phone jacks and XLR connectors allow a choice of unbalanced or balanced inputs. The 802-E's output circuit will drive high-impedance or 600 Ω lines.