B&K 125.7 S2 User Manual
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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

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 - Reference 125.5 S2 or Reference 125.7 S2

1 - User Manual

1 - Power Cord

1 - Warranty Card

B&K

SIMPLYBETTER!

SIMPLY BETTER! is a registered trademark of B&K Components, Ltd. All other brand or product names are trademarks or registered trademarks of their respective companies or organizations.

Limited Warranty

B&K Components Ltd., referred to herein as B&K, warrants your B&K equipment against all defects in material and workmanship for a period of five years from the date of purchase. This warranty applies only to the original purchaser and only to equipment in normal residential use and service.

Defective equipment must be returned to B&K, prepaid, accompanied by proof of purchase and sufficient payment to cover the cost of return shipping and handling, and will be repaired or replaced at the discretion of B&K whose decision as to the method of reparation will be final.

This warranty shall not apply to any equipment which is found to have been improperly installed, incorrectly fused, misused, abused, or subjected to harmful elements, used in any way not in accordance with instructions supplied with the unit, or to have been modified, repaired or altered in any way without the expressed, written consent of B&K. This warranty does not apply to the cabinet or appearance items such as the faceplate or control buttons, nor does it cover any expenses incurred in shipping the unit to and from the manufacturer's service department.

This warranty on B&K Components, Ltd. products is NOT VALID if the products have been purchased from an unauthorized dealer or an E-taileror if the original factory serial number has been removed, defaced or replaced in any way. B&K Components, Ltd. sells its products through authorized dealers in order to insure that consumers obtain proper dealer service and support. Buying from an authorized B&K Components, Ltd. dealer insures that you have a FACTORY WARRANTY on your B&K Components, Ltd. product. If you have any questions concerning your Factory Warranty call B&K Components, Ltd. at716-656-0026.

Upgradability: B&K is one the first manufacturers in the audio/video industry to consistently offer software and hardware upgrades to its processing of audio signals. Through upgrades B&K delivers exceptional value to its customers. But what is "Upgradability"? Upgradability is not a guarantee; we define it as a philosophy of designing and manufacturing products so that as audio technology evolves, B&K can provide enhancements and improvements to its products that are economically viable.

THE EXPRESS FACTORY WARRANTY HEREIN CONTAINED IS IN LIEU OF ANY AND ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,

INCLUDING ANY WARRANTY OF MERCHANTABILITY, UPGRADABILITY OR OF FITNESS FOR ANY PARTICULAR PURPOSE. B&K COMPONENTS, LTD. SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE FOR DAMAGES, INCLUDING SPECIAL, INCIDENTAL, EXEMPLARY, PUNI-

TIVE OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE PURCHASE, USE OR PERFORMANCE OF ANY B&K

PRODUCT.

This warranty gives you specific legal rights. Your may also have other rights which vary from State to State. Some States do not allow the exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not apply to you.

No agent, representative, dealer or employee of B&K has the authority to increase or alter the obligations or terms of this warranty.

Returning Equipment

No equipment may be returned to B&K Components Ltd. without a RETURN AUTHORIZATION (RA). Should you find it necessary to return equipment to B&K, for any reason, a RETURN AUTHORIZATION (RA) number must be issued by B&K in respect of the equipment being returned. You may request an RA number by calling B&K at the numbers below. We will need the following information to issue your RA number. Please have it ready before you call.

1.Your name, address, and phone number.

2.The model and serial number of the equipment being returned.

3.A description of the problem being experienced.

4.Your sales receipt.

Your call will be referred to a Technical Service Representative who will work with you to resolve the problem. If it is determined that the unit must be returned for repair, an RA number will be issued.

2100 Old Union Road Buffalo, NY 14227 1-800-543-5252

In NY: 716-656-0026fax:716-656-1291

e-mail:info@bkcomp.com Web Site:

www.bkcomp.com

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 #:

2 SAFETY PRECAUTIONS

Installation Considerations

C A U T I O N

R I S K O F E L E C T R I C S H O C K

D O N O T O P E N

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 constitute a risk of electric shock to you.

The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the unit.

Caution: To prevent the risk of electric shock, do not remove cover. No user-serviceableparts inside. Refer servicing to qualified service personnel.

Unplug the amplifier from the AC outlet when plugging in or unplugging cables, when left unused for an extended period of time, moving the amplifier, or when you suspect lightning in your area.

Prevent damage to the power cord. Do not bend, pull, place objects on, alter, etc. Replace the power cord if it becomes damaged. Always grasp the plug on the power cord when plugging in or unplugging the amplifier from the AC outlet.

Your system may produce sound levels capable of causing permanent hearing loss. Do not operate for extended periods of time at high volume levels.

Make sure the amplifier is placed on a level surface.

The amplifier is equipped with raised feet to provide ventilation, reduce acoustic feedback, and provide protection against scratching the surface the unit is resting on. We advise against removing or altering feet.

Do not stack anything on top of the amplifier (processor, source, etc.) Leave a minimum of 3" clearance from the top of the amplifier to the next shelf (or component) to insure proper ventilation.

The amplifier should be located away from other sources that may be sensitive to heat.

Do not perform any internal modifications to the amplifier.

Always connect the amplifier's power cord to an unswitched, dedicated AC outlet for normal operation.

If young children are present, adult supervision should be provided until the children are capable of following all rules for safe operation.

Mistaking CONTROL OUTPUT or CONTROL INPUT connectors for audio/video inputs or outputs may damage your amplifier or other components.

Damage can occur to your speakers if the power rating of each individual driver is exceeded by the amplifier. Ensure that all the drivers in your system are capable of handling not only the average power being delivered by the amplifiers, but also the peak power that is likely to be generated during strong passages.

Reference 125.5 S2 or Reference 125.7 S2 amplifiers can have drivers connected in parallel to

each amp channel. System impedance SHOULD NOT fall below the nominal impedance of the amplifier, i.e two 8Ω speakers in parallel = 4Ω (system impedance). Minimum stability refers to the periodic audio passages that demand large amounts of current at which time the output impedance drops.

The amplifier should be serviced by qualified personnel when:

A.The amplifier is not functioning properly.

B.Objects have entered the chassis.

C.The amplifier was exposed to rain or other type of moisture.

D.The amplifier was dropped, or the chassis is damaged.

 

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-artsolid state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer. All B&K products are designed and hand assembled in Buffalo, NY U.S.A.

The Reference 125.5 S2 or Reference 125.7 S2 operates with a class A predriver and AB MOSFET power output stages. These high power amplifiers are capable of delivering full range while reproducing the most demanding music passages effortlessly into the most demanding audiophile speakers.

FEATURES

High Current - Ability to cleanly, accurately, and reliably reproduce demanding recordings or source materials into low impedance drivers and speaker systems.

Class A Predriver - Improves low level detail and clarity for smoother, more musical sound.

AB MOSFET Output - Provides efficient and linear power delivery, as well as protection from thermal overload.

Gold Plated Connectors - Improved sound with minimum signal loss and degradation.

Five Way Binding Posts - High quality binding posts accommodate up to 4 gauge wire.

Control Output - One 3.5mm (1/8”)10-12VDC @ 200 mA output for controlling other amplifiers or controlling external systems that use a voltage trigger.

Control Input - One 3.5mm (1/8”) jack that allows standby on/off with a5-24VDC control signal.

Toroidal Transformer - Efficient, high current, shielded transformer that supplies the amplifier with a clean and constant supply of power, even during highly demanding source material passages.

Discrete Circuitry - Dynamically provides a full, accurate, and three dimensional reproduction of source material.

1% Metal Film Resistors - High quality resistors used in all active circuitry to reduce noise and obtain better sound purity.

Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low frequency control, increased power supply, and improved dynamics.

Balanced Inputs - Balanced inputs deliver the quietest and most accurate signal path between the preamplifier and amplifier.

Full Power Operation - Capability to operate at full power with a square wave input.

Differential Input Stage - A current source load assures DC stability and wide bandwidth linearity.

5 Year Factory Warranty - All B&K products sold through an authorized dealers are covered by a 5 year parts and labor factory Warranty.

Available Faceplates

17” Black (Standard)

17” Silver (Optional)

19” Black Rack Mount (Optional)

19” Silver Rack Mount (Optional)

4

BACK PANEL

8

CONTROL IN ALLOWS AMPLIFIER

OPERATION WHEN A 5-24VSIGNAL

IS APPLIED WITH A 3.5mm MINI JACK

 

 

 

 

 

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C H A N N E L 1 I N P U T

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C O N T R O L I / O

F U S E

C AU T I O N : F O R C O N T I N U E D P R O T E C T I O N A G A I N S T R I S K

O F F I R E R E P L A C E O N LY W I T H S A M E T Y P E A N D R AT I N G .

A C L I N E

 

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N E G AT I V E

C A U T I O N

R I S K O F E L E C T R I C S H O C K

D O N O T O P E N

7 6

C H A N N E L 2 I N P U T

C H A N N E L 3 I N P U T

C H A N N E L 4 I N P U T

C H A N N E L 5 I N P U T

X L R ( B A L A N C E D )

X L R ( B A L A N C E D )

R C A ( U N B A L A N C E D )

R C A ( U N B A L A N C E D )

 

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USE

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C H A N N E L 2 O U T P U T

P O S I T I V E

 

N E G AT I V E

 

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C H A N N E L 3 O U T P U T

P O S I T I V E

 

N E G AT I V E

S E R I A L #

 

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USE

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F

 

 

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C H A N N E L 4 O U T P U T

P O S I T I V E

 

N E G AT I V E

 

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USE

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F E

 

C H A N N E L 5 O U T P U T

P O S I T I V E

 

N E G AT I V E

www.bkcomp.com

C H A N N E L 6 I N P U T

X L R

R C A

 

F

USE

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C H A N N E L 6 O U T P U T

P O S I T I V E

 

N E G AT I V E

C H A N N E L 7 I N P U T

( B A L A N C E D )

( U N B A L A N C E D )

5

 

F

USE

 

E

 

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4

 

 

SU

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C H A N N E L 7 O U T P U T

 

P O S I T I V E

 

N E G AT I V E

 

H i g h Pe r f o r m a n c e

A u d i o / V i d e o S y s t e m s

H a n d - M a d e i n t h e U . S . A .

1

2

3

1.AC Fuse Holder - Holds the AC line fuse. This fuse is a 12 amp / 250 volt slow blow fuse. Replace only with the same type and value fuse.

2.AC Input Receptacle - For attaching the supplied AC power cord to the amplifier.

3.Speaker Outputs - For connecting the speakers to the amplifier. Explained further on page 6.

4.Speaker Fuses - For protection against amplifier damage in the case of shorted speaker wires. Replace fuse with the same type and value 4 amp slow blow.

5.Balanced (XLR) input - For connecting signal patch cables (interconnects) from the preamplifier to the amplifier. Explained further on page 5 and 6.

6.Unbalanced (RCA) Input - For connecting signal patch cables (interconnects) from the preamplifier to the amplifier. Explained further on page 5 and 6.

7.Balanced/Unbalanced Input Select - This switch is used to configure an AMPLIFIER PAIR for use as either balanced (XLR) or unbalanced (RCA) line inputs. This switch controls two amplifier channels and allows signal patch cables (interconnects) to be sourced from either balanced or unbalanced, preamplifier/processor or outputs. Explained further on page 5 and 6.

8.Amplifier Control Input/Output - Provides remote switching of the amplifier's standby on/off feature.

Explained further on page 8.