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Jeff Rowland Design Group, Inc. strives to manufacture the very finest possible equipment and 
therefore reserves the right to make changes in design and improvements upon its previously 
manufactured models.

THE ABOVE WARRANTY IS THE SOLE WARRANTY GIVEN BY JEFF ROWLAND DESIGN GROUP, 
INC. AND IS IN LIEU OF ALL OTHER WARRANTIES; ALL IMPLIED WARRANTIES OF 
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE SHALL BE STRICTLY LIMITED 
IN DURATION TO FIVE YEARS FROM THE ORIGINAL DATE OF PURCHASE AND UPON THE 
EXPIRATION OF THIS FIVE YEAR WARRANTY PERIOD, JEFF ROWLAND DESIGN GROUP, INC. 
SHALL HAVE NO FURTHER OBLIGATION OF ANY KIND WH ETHER EXPRESSED OR IMPLIED. 
SOME STATES DO NOT ALLOW EXCLUSIONS OR limitation ON HOW LONG IMPLIED 
WARRANTIES LAST, IN WHICH CASE THE ABOVE LIMITATIONS SHALL NOT APPLY. 

Jeff Rowland Design Group, Inc. does not authorize any third party, including any dealer or 
representative, to assume any liabilities on its behalf or to make any warranties on its behalf 
unless authorized to do so.

Warranty registration cards must be completed and mailed to Jeff Rowland Design Group, Inc. 
within thirty (30) days of the date of purchase. If this product is used in a commercial or 
industrial application, then special warranty exclusions may apply. Contact your dealer or Jeff 
Rowland Design Group, Inc. for information regarding our commercial warranty policies.

GUIDE USE

This guide is designed to make installing and using this product as easy as possible. 
Information in this document has been carefully checked for accuracy at the time of printing; 
however, Jeff Rowland Design Group, Inc.'s policy is one of continuous improvement, therefore 
design and specifications are subject to change without prior notice. If you notice any errors 
please feel free to email us at: support@jeffrowlandgroup.com.

This document contains proprietary information protected by copyright. All rights are 
reserved. No part of this manual may be reproduced by any mechanical, electronic or other 
means, in any form, without prior written permission of the manufacturer. All trademarks and 
registered trademarks are the property of their respective owners.

© Copyright Jeff Rowland Design Group, Inc 2011

 

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Summary of Contents for 625

Page 1: ...MODEL 625 STEREO AMPLIFIER Operational Manual REVB1 Jeff Rowland Design Group 2011 All Rights Reserved...

Page 2: ...properly grounded AC receptacle should be used A potential shock hazard may result if the supplied 3 wire grounded AC cable ground terminal is defeated or lifted or the unit is connected to a 2 wire...

Page 3: ...is non transferable to any secondary or other purchaser In order to have this product repaired or replaced the original purchaser must first obtain the prior authorization of Jeff Rowland Design Group...

Page 4: ...rized to do so Warranty registration cards must be completed and mailed to Jeff Rowland Design Group Inc within thirty 30 days of the date of purchase If this product is used in a commercial or indust...

Page 5: ...u to gain the maximum performance and ease of use for which this amplifier was designed Please note that your MODEL 625 STEREO AMPLIFIER serial number begins with the letters SB Please include this nu...

Page 6: ...TABLE OF CONTENTS Special Design Features 6 Maintenance and Care 8 Unpacking and Placement 9 Initial Inspection 9 Unpacking 9 Front Panel 10 Rear Panel 11 Specifications 12 PAGE 5...

Page 7: ...ty HIGH PRECISION SURFACE MOUNT COMPONENTS Extensive use of Lead Pb free low temperature coefficient active and passive surface mount components results in significantly smaller loop areas reduced cir...

Page 8: ...panel push button switches the amplifier into standby mode 1 watt consumption REMOTE ON OFF A 1 8 3 5mm mini plug connector on rear panel permits amplifier power on standby switching in remote and ho...

Page 9: ...6 MONTHS BEFORE ATTEMPTING TO CLEAN IT THIS WILL PREVENT SMALL SCRATCHES FROM MARRING THE SURFACE BEFORE THE SURFACE COATING HAS HAD A CHANCE TO HARDEN COMPLETELY WARNING THE FRONT PANEL OF THE UNIT...

Page 10: ...r immediately We strongly suggest that you save all of the packing materials If the amplifier is returned to your dealer or Jeff Rowland Design Group the original packing materials must be used for sh...

Page 11: ...t Panel 1 FRONT PANEL POWER BUTTON Press this button to operate the amplifier Press again to place the amplifier in Standby mode 2 POWER INDICATOR RING This white ring will illuminate when the amplifi...

Page 12: ...e usually red loudspeaker cable spade terminal to the positive binding post and the negative usually black spade terminal to the negative binding post of either horizontally or vertically oriented LEF...

Page 13: ...ms THD Noise 0 005 1 kHz 8 ohms Damping Factor 200 20 Hz 20 kHz Overall Gain Bal or Unbal 27 dB Common Mode Rejection Ratio 90 dB 20 Hz 20 kHz Absolute Phase Non inverting Pin 2 Positive Inputs 1 pair...

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