McIntosh Stereotech 2 Loudspeaker System Service Information.pdf

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1、STEREOTECH LOUDSPEAKER SYSTEM C. INSTRUCTION MANUAL SERIAL NUMBER BN 10 01 AND ABOVE SPECIFICATIONS CABINET SIZE 24-1/2 high 14 wide 12-5/16 deep CONSTRUCTION 45 pound density non-resonant particle board panels. Heavy guage 8 mil vinyl. Simulated walnut finish. Extra heavy 1 inch front panel. SPEAKE

2、R SIZE Woofer 10 dia. frame size (7-5/8 dia. radiator) Mid-range 5 dia. frame size (3-1/4 dia. radiator) Tweeter 1-3/4 dia. radiator CONTROLS Mid-range 800Hz To 3500Hz - boost, normal, and cut Tweeter 3500Hz To 20,000Hz - boost, normal, and cut POWER HANDLING: Sine wave steady state SHIPPING WEIGHT

3、51 lbs. SYSTEM WEIGHT 43 lbs, CROSSOVER FREQUENCIES 600Hz & 4kHz IMPEDANCE 8J Nominal FREQUENCY IN Hz 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

4、 normal to orchestral 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 2 speaker system will handle up to 90 watts of orchestral music program materi

5、al. Care must also be taken 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 exce

6、ssive heating and resulting damage to the high frequency speaker elements. LISTENING QUALITY Smooth response has been achieved by careful design under controlled laboratory conditions. The performance of the speakers in your listening room may be influenced to some degree by the room size, shape, co

7、nstruction, 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 will help to provide superior sound in a typical listening environment. There are two controls at the rear of the system. They provi

8、de 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 high frequencies. This may cause the speaker system to sound dull. The tweeter control would then be placed in the + position to com

9、pen sate. The controls may also be used to adjust for individual tastes in music. 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. CONNECTIONS Use heavy guage wire (#18 AWG or larger) whe

10、n connecting the speaker system 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 conn

11、ecting the speaker system and power amplifier 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 a quick check

12、 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 crossover network must

13、 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 connections, b

14、roken 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 (other than black)

15、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 to the + terminal of

16、 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 be visible after the

17、 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 watts. By listening ar

18、ound 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 returned to the Stereotech

19、 Division. SPEAKER LOCATION FRONT VIEW WITH FRONT PANEL REMOVED CROSSOVER NETWORK CROSSOVER NETWORK MIDRANGE TWEETER rO (/ h- rO CO SYSTEM SCHEMATIC REPLACEMENT PARTS Replacement parts may be obtained when ordered by PART NUMBER from: Stereo Technology Division 1010 Conk 1 in Rd. R.D. #1 Box ABA Con

20、k 1 in, N. Y. 13748 CAPACI TORS S ymbo1 Number Description Part Number Cl Elect 50pF 10% 100V 066-192 C2 Elect )6pF 10% 100V 066-224 C3 Mylar 3pF 10% 100V 064-121 CHOKES Li Choke 3mH 10% 122-120 L2 Choke 0.3mH 5% 122-159 L3 Choke 1.6mH 5% 122-162 L4 Choke 0.2mH 5% 122-158 RES1ST0RS R1 ,4 Wi rewound

21、4ft 5% I0W 139-086 R2,6 Wirewound 16ft 10% 10W 139-112 R3,5 Wirewound 7.5ft 5% 10W 139-090 R7 Wirewound 10ft 5% 10W 139-089 R8 Wirewound 6ft 5% 10W 139-087 LOUDSPEAKERS LSI 10 Woofer 036-041 LS2 5 Midranger 036-040 LS3 4-1/4 Tweeter 036-042 SWITCHES S i Mid Freq Level 146-169 S 2 Hi Freq Level 146-1

22、69 MISCELLANEOUS ITEMS Terminal - Red 084-094 Terminal - Black 084-095 Shipping Carton 033-196 Polybag 033-201 Cloth Front Panel: Assy. 044-788 Knobs: Switch 090-144 Gasket: 10 woofer 094-093 Gasket: 5 midrange 094-095 Gasket: 4-1/4 tweeter 094-102 Gasket: Network 094-105 STEREO TECHNOLOGY DIVISION lOlO CONKLIN RO. R O 1 BOX 41 3 A CONKLIN, NEW YORK 1374B 30C1220S7-M4784-