B and K Reference 125.5 Mk2 Owners manual

B

&K Components, Ltd.

User Manual

R

EFERENCE 125.5 S2

R

EFERENCE 125.7 S2

Five or Seven Channel Amplifier

13740 0604

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

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-tailer or 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. at 716-656-0026.

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, PUNI­TIVE 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.

ii

2100 Old Union Road Buffalo, NY 14227 1-800-543-5252 In NY: 716-656-0026 fax: [phone]

e-mail: [e-mail] Web Site: www.bkcomp.com

BK&

SBIMPLY ETTER!

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

1

Date of Purchase:

Amp Model #:

Amp Serial #:

Purchased From:

Address:

Phone #:

Product Information

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-serviceable parts
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.

SAFETY PRECAUTIONS

Installation Considerations

2

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN