McIntosh Stereotech 4 Loudspeaker System Service Information.pdf

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1、STEREOTECH LOUDSPEAKER SYSTEM INSTRUCTION MANUAL SERIAL NUMBER BR1001 AND ABOVE SPECIFICATIONS CABINET SIZE 28 high 16-1/2 wide 13-5/16 deep CONSTRUCTION SHIPPING WEIGHT 66 lbs SYSTEM WEIGHT 45 pound density non-resonant particle board panels. Extra heavy 1 inch front panel. Heavy guage 8 mil vinyl.

2、 Simulated walnut finish. 56 lbs CROSSOVER FREQUENCIES SPEAKER SIZE 600Hz & 5500Hz Woofer 12 dia. frame size (9-1/2 dia. radiator) IMPEDANCE Mid-range 5 dia. frame size (3-1/8 dia. radiator) Tweeter 1-5/8 dia. radiator Nominal CONTROLS Mid-range 600Hz To 5000Hz - boost, normal, and cut Tweeter 5000H

3、z To 20,000Hz - boost, normal, and cut 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 mu

4、sic 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 4 speaker system will handle up to 100 watts of orchestral program material. Care must also be taken t

5、o 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 d

6、amage 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 labor

7、atory 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 persion

8、 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 the

9、 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 syst

10、em 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 and

11、 power leads to maintain proper stereo perspective. amp 1ifier SERVICE NOTES 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 used as

12、 a quick check for distortion. A speaker element with obvious distor tion must be replaced. 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. The crossover netw

13、ork 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, bad connec

14、tions, broken wires, etc. After soldering a replacement crossover element into the circuit, use RTV Silicone rubber adhesive to insure a vibration free bond to the board. Use only Stereotech replacement capacitors. These have been specially selected for low ESR. The colored wire (other than black) a

15、lways 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 to the + terminal of

16、the speaker. 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 be visible after the par

17、t is insta11ed. If the woofer screw strips out in the wood of the cabinet, the speaker can be rotated and new mounting holes drilled. 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 watts. By listening around the s

18、peakers 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. . All defective parts must be packed well and returned to the Stereotech Division. S

19、PEAKER LOCATION FRONT VIEW WITH FRONT PANEL REMOVED LS3 CROSSOVER NETWORK LS3 LS2 ASSEMBLY 044-717 TWEETER CHEMATIC REPLACEMENT PARTS Replacement parts may be obtained when ordered by PART NUMBER from: Stereo Technology Division 1010 Conk 1in Rd. R.D. #1 Box 413A Conk I in, N. Y. 13748 CAPACITORS S

20、ymbo1 Number Description Part Number Cl Elect 50pF 10% 100V 066-192 C2 Elect 16pF 10% 100V 066-224 C3 Mylar 2pF 066-125 CHOKES LI Choke 5.7mH 122-157 L2 Choke 0.2mH 5% 122-158 L3 Choke 1.6mH 5% 122-162 L4 Choke 0.3mH 5% 122-159 RESISTORS R1 Wirewound 3n 5% 10W 139-110 R2 Wirewound I4n 10% 1 0W 139-1

21、11 R3,5 Wirewound 7.5n 5% 10W 139-090 R4,6 Wirewound 4n 5% 10W 139-086 R7 Wirewound 2fi 10% 10W 139-085 LOUDSPEAKERS LSI 12 Woofer 036-039 LS2 5 Square Midrange 036-038 LS3 2-1/4 Square Tweeter 036-012 SWITCHES SI Mid Freq. Level 146-169 S 2 Hi Freq. Level 146-169 MISCELLANEOUS ITEMS Terminal - Red

22、084-094 Terminal - Black 084-095 Shipping Carton 033-198 Po1ybag 033-202 Foam Front Panel Assy. 044-719 Knob - Switch 090-144 Gasket: 12 woofer 094-092 Gasket: 5 midrange 094-1 10 Gasket: 2-1/4 tweeter 094-096 Gasket: Network 094-105 STEREO TECHNOLOGY DIVISION 1010 CONKLIN RD. R D 1 BOX 41 3A CONKLIN, NEW YORK 13748