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1、STEREOTECH 3 LOUDSPEAKER SYSTEM INSTRUCTION MANUAL SERIAL NUMBER BP1001 AND ABOVE SPECIFICATIONS CABINET SIZE 26 high 15 wide 13-5/16 Deep CONSTRUCTION 45 pound density non-resonant particle board panels. Extra heavy 1 inch front panel. Heavy guage 8 mil vinyl. Simulated walnut finish. SPEAKER SIZE
2、Woofer 12 dia. frame size (9-1/2 dia. radiator) Mid-range 5 dia. frame size (3-1/4 dia. radiator) Tweeter 1-3/4 dia. radiator CONTROLS Mid-range 600Hz To 3500Hz - boost, normal, and cut Tweeter 3500Hz To 20,000Hz - boost, normal, and cut SHIPPING WEIGHT 58 lbs. SYSTEM WEIGHT 49 lbs. CROSSOVER FREQUE
3、NCIES 600Hz Sr 4kHz IMPEDANCE 8b Nominal POWER HANDLING: Sine wave steady state Avoid operating the speaker system with sustained sine wave signals at power levels greater than the indicated limits. Permanent damage may result. POWER HANDLING: Program Material High energy peaks normal to orchestral
4、music are easily and faithfully reproduced by the speaker system. These peaks are of relatively short duration and do not produce the heating effect caused by sustained tone operation. The Stereotech 3 speaker system will handle up to 100 watts of orchestral program material. Care must also be taken
5、 to use a power amplifier that has an adequate power rating. If a low power amplifier is used, the loudest passages may be clipped by the amplifier. This clipping will cause the speaker to sound distorted. The large harmonic content of a badly clipped signal can cause excessive heating and resulting
6、 damage to the high frequency speaker elements. OUTPUT LEVEL At 1 meter in a non-ref 1ecting environment, the system will nominally produce an 89dB sound pressure level when driven with 1 watt referred to 8fi. LISTENING QUALITY Smooth response has been achieved by careful design under controlled lab
7、oratory conditions. The performance of the speakers in your listening room may be influenced to some degree by the room size, shape, construction, and furnishing. The location of the speakers in the room will also affect listening quality. The additional features of low distortion and wide dis persi
8、on will help to provide superior sound in a typical listening environment. There are two controls at the rear of the system. They provide 2-3dB boost or cut in the frequency ranges stated in the specifications. For example, a room with heavy furnishings, drapes, books, and rugs will absorb some of t
9、he high frequencies. This may cause the speaker system to sound dull. The tweeter control would then be placed in the + position to compen sate. The controls may also be used to adjust for individual tastes in music. CONNECTIONS Use heavy guage wire (#18 AWG or larger) when connecting the speaker sy
10、stem to the power amplifier. The system leads preferably should have less than 0.4 ohms resistance and not more than 0.8 ohms resistance. (62 feet of #18 wire has 0.4 ohms resistance. This corresponds to 31 feet of two conductor wire). Be sure to observe polarity when connecting the speaker system a
11、nd power amplifier i-Leds rn maintain proper stereo perspective. SERVICE NOTES 1. Speaker element failure can be quickly located by using FM hiss at a low power level. Listen at each speaker to verify if all the speakers are at least working. A low power (1-5 watt) sine wave sweep 20-20kHz can be us
12、ed as a quick check for distortion. A speaker element with obvious distor tion must be replaced. 2. To determine if the speaker element is dead, remove the speaker and momentarily connect a 1-1/2 -6V battery across the terminals. If no sound is heard, the speaker element must be replaced. 3. The cro
13、ssover network must be inspected when burned out speaker elements are replaced. The network must also be inspected if a speaker element produces sound with the battery test but does not play when connected in the system. The woofer must be removed to get to the crossover. Check for burned resistors,
14、 bad connections, broken wires, etc. 4. After soldering a replacement crossover element into the circuit, use RTV Silicone rubber adhesive to insure a vibration free bond to the board. 5. Use only Stereotech replacement capacitors. These have been specially selected for low ESR. 6. The colored wire
15、(other than black) always goes to the red marked terminal on the speaker. This is the positive terminal. If the polarity of a speaker is unknown, momentarily connect a 1-1/2 - 6V battery to the terminals. When the cone moves away from the magnet, it means the + terminal of the battery is connected t
16、o the + terminal of the speaker. 7. When installing speakers or crossover network in the cabinet, care must be taken to insure a tight air seal to the cabinet. Replace the foam gasket if necessary. Mortite caulking compound or equivalent could be substituted but care must be taken that it will not b
17、e visible after the part is installed. 8. If the woofer screw strips out in the wood of the cabinet, the speaker can be rotated and new mounting holes drilled. 9. After the system is reassembled, it must be checked for air leaks. This can be done by putting a 20Hz sine wave into the system at 20 wat
18、ts. By listening around the speakers closely for hissing sounds, areas can be located that must be sealed. The system must also be swept from 20Hz to 250Hz at 20 watts to insure there are no vibrations due to wires hitting the woofer cone, etc. 10. All defective parts must be packed well and returne
19、d to the Stereotech Division. SPEAKER LOCATION FRONT VIEW WITH FRONT PANEL REMOVED CROSSOVER NETWORK CROSSOVER NETWORK ASSEMBLY 044-71 I TWEETER SCHEMATIC REPLACEMENT PARTS Replacement parts may be obtained when ordered by PART NUMBER from: Stereo Technology Division 1010 Conklin Rd. R.D. #1 Box 413
20、A Conklin, N. Y. 13748 CAPAC1 TORS S ymbo1 Number Description Part Number Cl Elect 50pF 10% 100V 066-192 C2 Elect 1 6pF 10% 100V 066-224 C3 Mylar 3pF 10% 100V 064-121 CHOKES LI Choke 5.7mH 122-157 L2 Choke 0.3mH 5% 122-159 L3 Choke 1.6mH 5% 122-162 L4 Choke 0.2mH 5% 122-158 RES 1ST0RS R1,3,5,7 Wirew
21、ound 7.5n 5% 10W 139-090 R2,6 Wirewound I4n 10% 10W 139-11 1 R4,8 Wirewound 4n 5% 10W 139-086 LOUDSPEAKERS LSI 12 Woofer 036-039 LS2 5 Midrange 036-040 LS3 4-1/4 Tweeter 036-042 SWITCHES S 1 Mid Freq. Level 146-169 S 2 Hi Freq. Level 146-169 MISCELLANEOUS ITEMS Terminal - Red 084-094 Terminal - Black 084-095 Shipping Carton 033-197 Po1ybag 033-202 Foam Front Panel Assy. 044-713 Knobs - Switch 094-144 Gasket: 12 woofer 094-092 Gasket: 5 midrange 094-095 Gasket; 4-1/4 tweeter 094-102 Gasket: Network 094-105 STEREO TECHNOLOGY DIVISION 1010 CONKLIN RD. R D 1 BOX 41 3 A CONKLIN, NEW YORK 13740
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