What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Harman/Kardon HK580i receiver

The hk580i is the lowest priced Harman/Kardon receiver ever to incorporate the incredible accuracy and reception of a digital, quartz locked tuner.

The tuner section is today's state-of-the-art.. You can tune up or down manually by pressing and holding one of the tuning buttons, or you can let the receiver scan automatically. Each time the scanner reaches a station, it will stop and allow the station to play for several seconds. It will continue scanning and playing until you find the station you want and defeat the scanning system.

For convenience, the hk580i gives you 4 memory presets, each able to store one AM station and one FM station for instant recall at the touch of a button.

The preamplifier and amplifier sections are just as impressive as our hk570i, with 35 amps available on demand. Accommodations for two tape decks and two speaker systems. There's also tape copy capability and more.

The hk580i, it brings the accuracy of advanced digtal technology to an affordable receiver.

 


Specifications

Amplifier Section

RMS Power Output (into 8   , 20-20,000 Hz):  45 watts (at less than 0,02% T.H.D.

Frequency Response (at rated output):  below 1 Hz - 150 kHz (-3 dB)

Intermodulation Distortion (at rated output):  ,06%

TIM Distortion (at rated output):  ,01%

Slew Rate/Power Amplifier:  60 volts/µsec

Overall Negative Feedback:  25 dB

Hum and Noise (A-weighted):

Phono :  -88 dB

Aux :  -100 dB

Residual :  -100 dB

Phono Overall:  >150 mV

Tuner Section

FM Sensitivity MONO:  1,8 µV

50 dB Quieting Sensitivity

Mono :  3,0 µV

Stereo :  35 µV

FM Noise:  -75 dB

Capture Ratio:  1,0 dB

Alternate Channel Selectivity:  -75 dB

IF Rejection:  100 dB

AM Rejection:  66 dB

Stereo Separation (1 kHz):  48 dB

FM Frequency Response at Detector Output:  DC -100 kHz (-3 dB)

AM Sensitivity:  300 µV/m

AM Selectivity:  45 dB

Am Alternate Channel Selectivity:  42 dB

AM Image Rejection:  56 db

Dimensions (W x H x D):  440 x 122 x 368 mm

Weight:  10,9 kg

Harman/Kardon HK570i receiver

Ultrawideband Linear Phase Stereo Receiver

For a medium priced receiver, the hk570i gives you better sound and more features than other comparably priced receivers.

It starts with a full 45 watts per channel, with instantaneous current capability up to 35 amps under peak demands. Our 5-level signal strength meter and station lock beacon help make sure you're always tuned accurately. The Auto FM feature automatically shifts the receiver into the mono mode when signals are so weak that stereo reception is poor. And all tone controls are defeatable, for the clearest cleanest, most distortion-free reproduction possible.

The hk570i also provides convenience features you 'll appreciate. Like tape copy functions and monitoring capabilities for two decks. Plus a subsonic filter, and a high cut filter that help eliminate surface noises from records.

The hk570i, perhaps the best combination of price  and performance on the market

 


Specifications

Amplifier Section

RMS Power Output (into 8  , 20-20,000 Hz):  45 watts (at less than 0,02% T.H.D.

Frequency Response (at rated output):  below 1 Hz - 150 kHz (-3 dB)

Intermodulation Distortion (at rated output):  ,06%

TIM Distortion (at rated output):  ,01%

Slew Rate/Power Amplifier:  60 volts/µsec

Overall Negative Feedback:  25 dB

Hum and Noise (A-weighted):

Phono :  -88 dB

Aux :  -100 dB

Residual :  -100 dB

Phono Overall:  >150 mV

Tuner Section

FM Sensitivity MONO:  2,0 µV

50 dB Quieting Sensitivity

Mono :  3,1 µV

Stereo :  37 µV

FM Noise:  -75 dB

Capture Ratio:  1,3 dB

Alternate Channel Selectivity:  -70 dB

Stereo Separation (1 kHz):  50 dB

FM Frequency Response at Detector Output:  DC -60 kHz (-3 dB)

AM Sensitivity:  300 µV/m

Dimensions (W x H x D):  440 x 122 x 368 mm

Weight:  9,54 kg

 

Bozak The Bard B-1002 speaker

Bozak, outdoor portable 2-way speaker

The Bozak Bard is a completely weather-proof portable speaker designed for outdoor use. Bard is the finest outdoor sound system ever made available for the home. It is unique, not only in its resistance to the elements (sun, rain, sleet or snow), but can also deliver full realistic sound in the difficult open air environment.

The rugged hemispheric construction of the Bard houses Bozak's famous 8" wide dispersion aluminum driver, with its tremendous power handling capacity, and is complemented by a 2" aluminum cone tweeter. Working together they provided clean, distortion-free music in outdoor applications when little or no reflection from surrounding watts is often encountered.

The famous Bozak 8" aluminum driver and 2" aluminum tweeter are housed in an aluminum enclosure enabling the Bard to be left outside all year round, providing party music in the summer and seasonal music through the holidays.

 

Specifications

Type: Outdoor 2-way speaker

Driver:

1 x 8-inch midrange/woofer

1 x 2-inch tweeter

Frequency Response:  30 - 20,000 Hz

Impedance:  8  nominal

Power Handling:  12 watts (min.) 80 watta (max.)

Connector: Jacks and plugs

Dimensions (D x H x D):  18" x 12" x 12"

Weight (shipping):  10 kg (21 lbs)

Axiom AX 1,5 loudspeakers


 Inexpensive speakers tend to be studies in compromise, attemps to achieve smooth response with low-priced drivers and very simple crossover networks. Recently, however, the qaulity of models at under $500 a pair has dramatically increased, and the Axiom 1,5 is an example of minimizing both cost and compromise.

A 2-way system in a somewhat tall, narrow box, the Ax 1,5 is a very listenable reproducer. Response is +4/-2 dB from just over 500 - 16,000 Hz. Without the 7 dB bump at 400 Hz, response would be within these limits right down to 50 Hz, which is very respectable performance.

Top end response is elevated in a fashion similar to the AR but doesn't sound quite as etched. There are two reason for this seeming anomaly; first, though we reference our measurement to 1 kHz, this frequency is actually in a trough, so much of the midrange is balanced in level with the top  of peak, another dip being seen in the first overtone frequency range between 5 to 10 kHz. These characteristics, combined with the boost at 400 kHz, make for a quite natural balance, marred only by some midrange coloration.

In music test this manifested itself in the voice test as a mildly muffed quality and some edginess in female voice a result of the 4 kHz peak.

The surprise, however, in this speaker was the bass extension, down only 6 dB at 40 Hz and about 12 dB at 32 Hz. Measurements of exact cut-off points in bass response are always hard to make, especially in small speakers, because woofer harmonic distortion (or doubling) is high, and tends to be hard to separate from the fundamental. But there was appreciable pure bass below 40 Hz, so judicious placement, as well as reasonable levels, will provide excellent bass response from the 1,5. they should be mounted on stands about 20" high, but will not become boomy from corner placement because of the smooth bass curve.

 

Specifications

Frequency Response:  45 - 22 kHz +2 dB

Sensitivity:  89 dB

Impedance:  6  minimum

Recommended Min./Max. Amp. Power:  15 watts /100 watts

Dimensions (W x H x D):  495 x 212 x 193 mm (19,5" x 8,38" x 7,62")