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B&K Components, Ltd.
User Manual
REFERENCE 125.5 S2
REFERENCE 125.7 S2
Five or Seven Channel Amplifier
13740 0604
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ii USER MANUAL - REFERENCE 125.5 S2, REFERENCE 125.7 S2 © 2004 B&K Components Ltd. All rights reserved. The information in this manual is copyright protected. No part of this manual may be copied or reproduced in any form without prior written consent from B&K Components, Ltd. B&K Components Ltd. SHALL NOT BE LIABLE FOR OPERATIONAL, TECHNICAL OR EDITORIAL ERRORS/OMISSIONS MADE IN THIS MANUAL. The information in this manual may be subject to change without prior notice. Accessories Included 1 -
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1 TABLE OF CONTENTS ACCESSORIES AND LIMITED WARRANTY ii TABLE OF CONTENTS 1 SAFETY PRECAUTIONS 2 PURPOSE AND FUNCTION 3 BACK PANEL 4 INPUTS 5 INPUT/OUTPUT CONNECTIONS 6 SYSTEM INSTALLATION 7 CONTROL TRIGGERS 8 TROUBLESHOOTING 9 SPECIFICATIONS Back Cover Product Information Date of Purchase: Amp Model #: Amp Serial #: Purchased From: Address: Phone #:
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2 SAFETY PRECAUTIONS Installation Considerations CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: to prevent fire or shock hazard, do not expose this unit to rain or moisture. Care should be taken to prevent objects or liquid from entering the enclosure. Never handle the power cord with wet hands. • • The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user of the presence of uninsulated "dangerous voltage" within the product's enclosure that may c
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3 PURPOSE AND FUNCTION PURPOSE AND FUNCTION The Reference 125.5 S2 (Five channel) or Reference 125.7 S2 (Seven channel) is a high power amplifier that is designed for use in all types of audio or audio/video systems. DESIGN AND CONSTRUCTION The Reference 125.5 S2 or Reference 125.7 S2 amplifier utilizes high quality electronic circuitry to achieve an environment wherein a detailed, transparent, and highly musical sound can be realized. The high quality parts complement includes: state-of-the-art
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EE EE EE EE EE EE EE SS SS SS SS SS SS SS U U U U U U U U U U U U U U FF FF FF FF FF FF FF EE EE EE EE EE EE EE SS SS SS SS SS SS SS 4 BACK PANEL 8 7 6 CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5-24V SIGNAL IS APPLIED WITH A 3.5mm MINI JACK CTRL CHANNEL 1 INPUT CHANNEL 2 INPUT CHANNEL 3 INPUT CHANNEL 4 INPUT CHANNEL 5 INPUT CHANNEL 6 INPUT CHANNEL 7 INPUT XLR IN (BALANCED) XLR (BALANCED) XLR (BALANCED) XLR (BALANCED) CTRL RCA (UNBALANCED) RCA (UNBALANCED) RCA (UNBALANCED) RCA (UNBALANCED) OUT
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5 INPUTS INPUTS The Reference 125.5 S2 or Reference 125.7 S2 allows signal patch cables (interconnects) to be sourced from either balanced or unbalanced preamplifier/processor outputs. A switch is used to configure a PAIR of AMPLIFIER CHANNELS for use with either balanced (XLR) or unbalanced (RCA) outputs. CHANNEL 2 INPUT CHANNEL 3 INPUT XLR (BALANCED) RCA (UNBALANCED) XLR BALANCED There are five balanced (XLR) input connectors on the Reference 125.5 S2 and seven balanced (XLR) input connectors
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EE EE EE EE EE EE EE SS SS SS SS SS SS SS U U U U U U U U U U U U U U FF FF FF FF FF FF FF EE EE EE EE EE EE EE SS SS SS SS SS SS SS 6 INPUT/OUTPUT CONNECTIONS Use either RCA unbalanced or XLR balanced to connect the preamplifier to amplifier. RCA Unbalanced Connections SURROUND LEFT CENTER SURROUND RIGHT SURROUND BACK LEFT FRONT LEFT FRONT RIGHT SURROUND BACK RIGHT CONTROL I/O CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5-24V SIGNAL IS APPLIED WITH A 3.5mm MINI JACK INPUT INPUT 1 1 INPUT INPUT
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7 SYSTEM INSTALLATION There will most likely be a number of cables involved in the installation of your home entertainment system. Preplanning is essential in order to maximize system efficiency. We recommend the following as a means of helping you reach that goal. • • When possible, use a dedicated AC power line for the amplifier, one that is not shared by any other household component. THIS IS VERY IMPORTANT!! • • Make a diagram of your proposed system by laying out the relative location
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8 CONTROL TRIGGERS A control (trigger) system is provided on the Reference 125.5 S2 or Reference 125.7 S2 amplifiers to allow remote switching of the amplifier's standby on/off feature. The control input is designed to operate with a source (trigger) of 5-24 volts DC. All B&K A/V processors and preamplifiers utilize control output triggers to easily integrate an amplifier into an audio system. In addition, your amplifier has a control output circuit to allow control of an external device such
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9 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION No sound 1. Power cord not plugged in. 1. Reconnect power cord. (power 'on' LED not illu- 2. Power off at AC source. 2. Check AC switch or fuse. minated). 3. AC power inlet fuse blown or 3. Check for shorts or overloading. faulty. 4. Supply Control IN with a 5-24 Volt 4. Control voltage not activated. DC supply (Page 8). 5. Power switch in off position 5. Push in power switch. (out). No sound on some or all 1. Speaker leads loose or fau
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SPECIFICATIONS REFERENCE 125.5 S2 & REFERENCE 125.7 S2 Power Rating: 8Ω 125.5 / 125.7 125 watts / 125 watts Power Rating: 4Ω 125.5 / 125.7 185 watts / 185 watts Number of Channels 5 / 7 Current (peak to peak) 30 Amps / 30 amps Dynamic Headroom 1.2 dB / 1.2 dB Total Harmonic Distortion (THD) 0.09 % Signal to Noise (S/N) 95 dB Input Impedance 33.2 kΩ Damping Factor (50 Hz) 180 / 180 Frequency Response 5 Hz - 45 kHz Slew Rate 14 V / µsec Input Sensitiv
