Yamaha P1250 Manuals

Manuals and User Guides for Yamaha P1250. We have 4 Yamaha P1250 manuals available for free PDF download: Operating Manual, Service Manual

Yamaha P1250 Operating Manual (45 pages)

Yamaha P1250: User Guide

Brand: Yamaha | Category: Amplifier | Size: 4.17 MB

How to Use this Manual
2
Table of Contents
2
Product Overview
3
Brief Operating Instructions
4
Front Panel
4
Input Attenuators
4
Input Level Indicators (Signal, Clip)
4
Hint Regarding Turn-On of the Power Amplifier
5
Rear Panel Facilities
6
Input Connections
6
Mode Switch (Mono/Stereo)
6
Speakers Output Connections
7
Fuse
7
Amplifier Operation
8
Precautions Regarding AC Power Source for Amplifiers
8
Installation
9
XLR Connectors and Phone Jacks
9
Output Connections
10
Normal Output Connections
10
Mono Mode Connections
11
More Information on Sound System Wiring
12
Balanced and Unbalanced Wiring
12
Why Input Transformers Sometimes Are Used
13
Noise and Losses in Low Impedance and High Impedance Lines
14
Signal Levels, Dynamic Range and Headroom
14
Standard Operating Levels
14
Speaker Level and High Level
14
Understanding Dynamic Range and Headroom
15
A General Approach to Setting Levels in a Sound System
16
How to Select a Headroom Value and Adjust Levels Accordingly
16
Grounding
17
What Is a Ground Loop, Why Is It Bad, and How Is It Avoided
18
Balance Lines and Ground Lift Switches
19
AC Outlet Wiring Affects Grounding and Safety
20
How to Obtain a Safety Ground When Using a 2-Wire Outlet
20
Improperly Wired AC Outlets: Lifted Grounds
20
Improperly Wired AC Outlets: Lifted Neutral
20
AC Safety Tips
21
Speaker Wiring
22
Use the Appropriate Wire
22
Calculating Speaker System Load Impedance
22
Impedances of Series/Parallel Speaker Wiring
24
Distributed Speaker Systems and Constant Voltage Lines
25
Information about the Transformers Used on the Speakers
26
How to Calculate Amplifier Power Output in Bridged Mono Mode
26
Multi-Amplifier Speaker Systems (Biamping, Triamping and so Forth)
27
How Crossover Networks Operate and What They Do
28
The Difference between Low and High Level Crossovers
29
The Pros and Cons of Low Level and High Level Crossovers
29
Three Types of 3-Way Speaker Systems
30
The Meaning of Various Amplifier Power Rating Methods
31
Peak Power
31
Continuous Average Sine Wave Power (RMS Power)
31
IHF Power and Dynamic Headroom (Music Power)
31
Protection for Speakers
32
Output Relay
32
Current Limiting
32
Speaker Fuses
32
Compressor/Limiter
33
Equalizers and Filters
33
High Frequency Driver Protection Networks (Filters)
33
Specifications
35
Block Diagram
39
Performance Graphs
40
Dimensions
42

Yamaha P1250 Service Manual (33 pages)

Brand: Yamaha | Category: Amplifier | Size: 1.78 MB

Table of Contents
1
Important Notice
2
Specifications
2
Performance Graphs
6
Disassembly Procedures
10
Check and Adjustment
11
Block Diagram
12
Dimensions
12
Circuit Boards
13
Exploded View
18
Parts List
19
Schematic Diagram
26

Yamaha P1250 Operating Manual (44 pages)

Brand: Yamaha | Category: Amplifier | Size: 4.18 MB

Yamaha P1250 Service Manual (21 pages)

Brand: Yamaha | Category: Amplifier | Size: 1.04 MB

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