User manual YAMAHA P2250

[. . . ] ORGANIZATION We recommend that you read the entire Operating Manual. However, if you are using the P-2200 in an existing system, and you are familiar with high power amplifiers, the BRIEF OPERATING INSTRUCTIONS, Pages One 1 & 2, contain all the information necessary for basic connections and operation. The SPECIFICATION sections, (Sections THREE and FOUR) are highly detailed, including oscilloscope photos, and discussions of the P-2200's excellent performance specifications. The last part of the SPECIFICATIONS section is a discussion of the advantages of professional equipment, like the P-2200, compared to hi-fi or semi-pro equipment. [. . . ] Then tin the shield conductor, orienting it with the center conductors so they are aligned with the proper pins of the insert. Cut the end of the shield so that it extends 1/16" beyond the center conductors. Solder the center conductors to their respective pins, using just enough solder to fill the end of the pin. Yamaha's wiring standard dictates that the black lead mates with pin 3, the white (or red) lead with 2 (see footnote on page 10 of this section). Clean off any solder splashes, and inspect for burned insulation. Insert the locking tab in the female insert, as illustrated, with small nib facing front of connector. Slide insulating collar foward, up to rear edge of female insert. The outer insulation of the cable must be flush with, or covered by the end of the insert. If any of the center conductors are visible, the cable clamp may not be able to grip the cable firmly, and the connector leads will soon fatique. Then slide the collar back into the shell. Slide the shell forward, orienting the notch in the shell with the locking tab in the insert. Secure the insert in the shell with the set screw. Place the cable clamp over the rear of the shell, with careful attention to the clamp's orientation; a raised lip inside the clamp should be aligned immediately over a lip in the shell for thinner cables (No. 8412), the clamp should be turned around to offset the lips and provide more clearance for the cable. In one position, the switch beside the connectors attaches pin 2 to pin 1 (ground) leaving pin 3 "hot" (USA standard). In the other position, the switch attaches pin 3 to pin 1 (ground) leaving pin 2 "hot" (DIN/JIS standard). If the source feeding the P-2200's input is unbalanced, the switch must be properly set to avoid shorting out the source. If the source is balanced, the P-2200's inputs will unbalance the source. In many situations, this is acceptable, however, the input polarity switch must still be set in the position corresponding to the "hot" pin of the balanced source. If the switch is set in the wrong position, the signal will be inverted at the P-2200's output compared to the signal at the source ("out-of-phase"), Fig. 50B - Equivalent Circuit: Speaker Impedances in Series. Fig. 50C - Circuit as seen by One Speaker of Series Pair. Note that a series connection of two speakers degrades the damping factor (see Page FOUR 7) because each speaker looks back at the amplifier through the impedance of the other speaker. Thus the effective output impedance of the P-2200 as seen by one speaker is equal to the actual output impedance of the other speaker (see Figure 50). Also, the impedance of most speakers lowers with frequency, so that the effective load of two "8 ohm" speakers in parallel across the output of the P-2200 may be as low as 2. 5 to 3 ohms at certain frequencies. [. . . ] "V 1 " is the voltage level on the primary side of the transformer, " V 2 " is the voltage level on the secondary side of the transformer. "I 1 " is the current level on the primary side of the transformer, " I 2 " is the current level on the secondary side of the transformer. "Z 1 " is the impedance of the circuit seen at the primary side of the transformer, "Z2" is the impedance seen at the secondary side of the transformer. Equations: 1. V1/V2=N1/N2 2. l/I2=N2/N1 3. Z1/Z2= [N1/N2]2 OTHER CONSIDERATIONS A transformer actually doesn't have any impedance of its own. [. . . ]