McIntosh Stereotech 1 Loudspeaker System Service Information.pdf

《McIntosh Stereotech 1 Loudspeaker System Service Information.pdf》由会员分享，可在线阅读，更多相关《McIntosh Stereotech 1 Loudspeaker System Service Information.pdf（7页珍藏版）》请在收音机爱好者资料库上搜索。

1、STEREOTECH LOUDSPEAKER SYSTEM INSTRUCTION MANUAL SERIAL NUMBER BM1001 AND ABOVE SPECIFICATIONS CABINET SIZE 23 high 13 wide 10-11/16 deep CONSTRUCTION 45 pound density non-resonant particle Extra heavy 1 inch front panel. Heavy vinyl. Simulated walnut finish. SPEAKER SIZE Woofer 10 dia. frame (7-3/4

2、 dia. ra Tweeter 2 radiator POWER HANDLING: Sine wave steady state SHIPPING WEIGHT 39 lbs. SYSTEM WEIGHT board panels. 32 lbs. guage 8 mi 1 CROSSOVER FREQUENCY 1500Hz iator) IMPEDANCE 8n Nominal POWER LIMIT IN WATTS FREQUENCY IN Hz Avoid operating the speaker system with sustained sine wave signals

3、at power levels greater than the indicated limits. Permanent damage may result. POWER HANDLING: Program Material High energy peaks 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

4、 caused by sustained tone operation. The Stereotech 1 speaker system will handle up to 70 watts of orchestral music program material. 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 ampli

5、fier. This clipping will cause the speaker to sound distorted. The large harmonic content of a badly clipped signal can cause excessive heating and resulting damage to the high frequency speaker element. OUTPUT LEVEL At 1 meter in a non - ref 1ecting environment, the system will nominally produce an

6、 89dB sound pressure level when driven with I watt referred to 8fl. 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, construct

7、ion, 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. CONNECTIONS Use heavy guage wire (pl8 AWG or larger) when connectin

8、g 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 418 wire has 0.4 ohms resistance. This corresponds to 31 feet of two conductor wire.) Be sure to observe polarity when connecting the

9、speaker system and power amplifier leads to 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-

10、20kHz can be used 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 repla

11、ced. 3. The crossover 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 bu

12、rned resistors, 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. Th

13、e colored wire (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

14、 is connected to 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 tha

15、t it will not be 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 s

16、ystem at 20 watts. 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 w

17、ell and returned to the Stereotech Division. SPEAKER LOCATION FRONT VIEW WITH FRONT PANEL REMOVED CROSSOVER NETWORK ED Bl A LSI M SCHEMATIC REPLACEMENT PARTS Replacement parts may be obtained when by PART NUMBER from: ordered Stereo Technology Division 1010 Conk 1 in Rd. R.D. #1 Box 413A Conk I in,

18、N. V. 13748 CAPACITORS S ymbol Number Description Part Number Cl Mylar 2pF 064-125 CHOKES LI Choke 3.0mH 122-120 RESISTORS R1 Wirewound 1 On 5% 10W 139-089 R2 Wirewound 15n 5% 10W 139-107 LOUDSPEAKERS LSI 10 Woofer 036-036 LS2 3-1/8 Tweeter 036-037 MISCELLANEOUS ITEMS Terminal - Red 084-094 Terminal - Black 084-095 Shipping Carton 033-199 Polybag 033-201 Cloth Front Panel: Assy. 044-787 Gasket: 10 woofer 094-098 Gasket: 3-1/8 tweeter 094-109 Gasket: Network 094-105 STEREO TECHNOLOGY DIVISION 1 1 CONKLIN RO. R 1 BOX 4-1 A CONKLIN, NEW YORK 1374B