DRAWMER CPA-50 POWER AMPLIFIER CONTENTS Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ..................2 Safety Consideration ...........2 Radio Frequencies Statement Chapter 1 - Introduction Introduction . . . . . . . . . . . . . . ..... Power Connection .......... Portable Applinace.Testing Typical Connection Guide . . . . . . . . . . .. .. .. .. .... .... .... .... .. .. .. .. .3 .4 .4 .5 Chapter 2 - Control Description Contol Description . . . . . . . . . . . . . . . . . . . . . 6 Example Wiring Methods . . . . . . . . . . . . . . . 8 Chapter 3 - General Information If a fault develops . . . . . . . . . . . . . . . . . . . . 10 Contacting Drawmer . . . . . . . . . . . . . . . . . . .10 Specification . . . . . . . . . . . . . . . . . . . . . . . 10 DRAWMER COPYRIGHT This manual is copyrighted © 2016 by Drawmer Electronics Ltd. With all rights reserved. Under copyright laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, without the written permission of Drawmer Electronics Ltd. ONE YEAR LIMITED WARRANTY Drawmer Electronics Ltd., warrants the Drawmer CPA-50 Power Amplifier to conform substantially to the specifications of this manual for a period of one year from the original date of purchase when used in accordance with the specifications detailed in this manual. In the case of a valid warranty claim, your sole and exclusive remedy and Drawmer’s entire liability under any theory of liability will be to, at Drawmer’s discretion, repair or replace the product without charge, or, if not possible, to refund the purchase price to you. This warranty is not transferable. It applies only to the original purchaser of the product. For warranty service please call your local Drawmer dealer. Alternatively call Drawmer Electronics Ltd. at +44 (0)1709 527574. Then ship the defective product, with transportation and insurance charges pre-paid, to Drawmer Electronics Ltd., Coleman Street, Parkgate, Rotherham, S62 6EL UK. Write the RA number in large letters in a prominent position on the shipping box. Enclose your name, address, telephone number, copy of the original sales invoice and a detailed description of the problem. Drawmer will not accept responsibility for loss or damage during transit. This warranty is void if the product has been damaged by misuse, modification, unauthorised repair or installed with other equipment that proved to be faulty. THIS WARRANTY IS IN LIEU OF ALL W ARRANTIES, WHETHER ORAL OR WRITTEN, EXPRESSED, IMPLIED OR STATUTORY. DRAW MER MAKES NO OTHER W ARRANTY EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. PURCHASER’S SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIR OR REPLACEMENT AS SPECIFIED HEREIN. IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECT IN THE PRODUCT, INCLUDING LOST PROFITS, DAMAGE TO PROPERTY, AND, TO THE EXTENT PERMITTED BY LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF DRAWMER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Some states and specific countries do not allow the exclusion of implied warranties or limitations on how long an implied warranty may last, so the above limitations may not apply to you. This warranty gives you specific legal rights. You may have additional rights that vary from state to state, and country to country. For the USA FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off an on, then the user is encouraged to try to correct the interference by one or more of the following measures: Re-orient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. Unauthorised changes or modification to this system can void the users’ authority to operate this equipment. This equipment requires shielded interface cables in order to meet FCC class B limit. For Canada CLASS B NOTICE This digital apparatus does not exceed the Class B limits for radio noise emissions set out in the Radio Interference Regulations of the Canadian Department of Communications. CLASSE B AVIS Cet appareil numérique ne dépasse pas les limites de la classe B au niveau des émissions de bruits radioélectriques fixés dans le Règlement des signaux parasites par le ministère Canadien des Communications. In the interests of product development, Drawmer reserve the right to modify or improve specifications of this product at any time, without prior notice. SAFETY CONSIDERATIONS CAUTION - SERVICING DO NOT OPEN. REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. WARNING TO REDUCE RISK OF FIRE/ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO MOISTURE. WARNING DO NOT ATTEMPT TO CHANGE OR TAMPER W ITH THE SUPPLIED MAINS CABLES. WARNING THE FUSE IN THE INLET HAS BEEN SET TO A RATING THAT ENSURES IT WILL BLOW BEFORE THE INTERNAL FUSE IF THE AMPLIFIER IS DRIVEN AT CLIPPING LEVELS FOR ANY SIGNIFICANT LENGTH OF TIME. THIS IS TO PREVENT THE AMPLIFIER AND/OR SPEAKERS FROM BEING DAMAGED. TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSES ONLY WITH A FUSE THAT CONFORMS TO IEC127-2. 250 VOLT WORKING, TIME DELAY TYPE AND BODY SIZE OF 20mm x 5mm. THE MAINS INPUT FUSE MUST BE RATED AT T800mA at 115V and T500mA at 230V. 2 CHAPTER 1 CPA-50 Power Amplifier The CPA-50 Stereo Power Amp is the perfect partner for any passive speaker, and especially in the studio with a set of passive cube monitors. Sitting between your monitor controller/ pre-amp and a pair of passive speakers, the high performance Class D amplifier delivers 25Wrms per channel into 8 ohms (50W rms per channel into 4ohms) and offers features including thermal, overload and power up/power down protection and fault indication. With just a 6.5” square footprint, the CPA-50 blends seamlessly with a pair of Yamaha NS10 or Auratone C5 monitor types, for example, and is small and light enough to fit into a bag to take anywhere. As well as working in stereo the CPA-50 can also function as a 100Wrms into 8ohms Monoblock (set via internal jumpers), which allows the system to operate in bi-amped or bridged modes. Drawmer CPA-50 Power Amplifier Features at a Glance: 50+50Wrms into 4 Ohms@1%THD. 25+25Wrms into 8 Ohms@1%THD. 1x100W into 8 Ohms bridged mode. Stereo/Bridge internal jumper to use as a Stereo amplifier or as a Monoblock in Bridged or Bi-Amp Modes. Balanced Neutrik XLR input. Efficient, low heat design with Low Power Consumption. Consumes only 6W of power when idling and <0.5W when in standby mode. Thermal, overload and power up/power down protection. Standby, fault and clip indicators Rugged steel chassis. Desktop unit that can be stacked. Compact and Portable. Dimensions: L 184mm x W 165mm x H 51mm. CPA-50 Power Amplifier 3 DRAWMER POWER CONNECTION The CPA-50 unit will be supplied with a power cable suitable for domestic power outlets in your country. For your own safety, it is important that you use this cable to connect to the mains supply earth. The cable must not be tampered with or modified. The power supply socket has an integral fuse drawer containing the power fuse of the same value, to suit the mains voltage for which the unit has been supplied. Removal of the drawer is only possible with the power cord removed. The fuse should never blow under normal operation. If the fuse is suspected of having blown, then a fault will have occurred and this fault condition should be inspected by a qualified service engineer. When replacing the fuse, always comply with the Safety Instructions. If the unit is to be used with a mains input operating voltage different to that for which the unit is supplied, the following procedure must be carried out by a technically competent person: 1: Disconnect the unit from the mains and cable. 2: Using a No.1 size pozidrive screwdriver, remove the four screws that retain the top cover. For conversion to 230Volt AC (previously set to 115Volt AC)..... 3a. remove the j umper across the CON101 socket 3b. Exchange the T800mA fuse below the mains socket for a similar type rated at T500mA For conversion to 115Volt AC (previously set to 230Volt AC)..... 4a. Add a jumper across the CON101 socket 4b. Exchange the T500mA fuse below the mains socket for a similar type rated at T800mA In all cases: 5: Replace the top cover using the four screws. 6: Re-connect to mains power source. PORTABLE APPLIANCE TESTING To undergo a Portable Appliance Testing procedure (commonly known as "PAT", "PAT Inspection" or "PAT Testing") remove the screw on the right side of the CPA-50, nearest the IEC socket that holds the cover in place and probe in this cavity. Alternatively, the screw can be replaced for something more suited to the job, such as a spade terminal with a self tapping M3 thread. 4 TYPICAL CONNECTION GUIDE STANDARD STEREO WIRING 50+50W rms into 4 Ohms@1%THD CPA-50 Power Amplifier 5 DRAWMER CONTROL DESCRIPTION 1 POWER On / Standby The unit has a soft on/off switch on the front panel. With the switch in the CPA-50 is active and the LED indication beneath lights. With the switch out it is operating in standby - the standby LED illuminates and the CPA-50 draws 0.5 Watts of power. 2 STATUS Fault Fault: This is illuminated is the CPA-50 has detected an error via it’s in built sensors, these include: Power shut down by over temperature - If the temperature inside the CPA-50 should pass the threshold of 100°C minimum to 110°C maximum (105°C typical) the MPA will shut down for a few moments. The shutdown time is short but increases as the unit heats up. As well as the illumination of the LED indication this protection mode will be heard as very short interrupts to the sound. Over voltage shutdown. - If the mains voltage exceeds the absolute maximum rated level of ~ 90-132 / 180-264 VAC the CPA-50 will momentarily shut down and the Fault LED will illuminate. This protection mode will be heard as very short interrupts to the sound. In the event of a fault occurring the source of the problem should be repaired before permanent damage to the system occurs. Bridge: To set Bridge mode, to use the CPA-50 as a monoblock, remove the cover by unscrewing the four screws. Set the j umpers on connectors J7 and J10 to the position shown in the diagram (right). Replace the cover. Note: Use only the left input, and connect to R - and L + speaker terminals (R+ & L- are not used). The Bridge LED will be inactive in stereo mode, providing 50+50W rms into 4 Ohms. W hen the Bridge LED is illuminated it indicates that the CPA-50 is set to Bridge (mono) mode, providing 1x100Wrms into 8 Ohms. 6 CHAPTER 2 3 BALANCED INPUT XLR The input is in the form of Balanced Neutrik XLR connectors • Interference: If the unit is to be used where it maybe exposed to high levels of disturbance such as found close to a TV or radio transmitter, we advise that the unit is operated in a balanced configuration. The screens of the signal cables should be connected to the chassis connection on the XLR connector as opposed to connecting to pin1. The CPA-50 conforms to the EMC standards. • Ground Loops: If ground loop problems are encountered, never disconnect the mains earth, but instead, try disconnecting the signal screen on one end of each of the cables connecting the outputs of the CPA-50 to the patchbay. If such measures are necessary, balanced operation is recommended. 4 SPEAKER OUTPUTS L-/L+/R-/R+ The speaker outputs connectors are in the form of binding posts that can be wired directly to the speaker terminals via bare wires through the hole and tightened, via spade terminals, or via banana plugs.* The diagrams on the following pages show some common wiring methods. Note that when in bridged mono mode the R - provides the negative terminal and L + provides the positive, the other terminals are not used. (See 2 Bridge) *Due to European legislation the use of banana plugs is not permitted. Banana plugs should only be used in the USA and Canada. 5 POWER The mains inlet, I.E.C., which also incorporates the internal mains fuse, can be found on the rear of the unit. If a fuse should need replacing see section ‘Power Connection’. A mains lead will have been provided with the CPA-50 to suit the mains configuration for the country of your purchase. Please use this cable. The power switch is a hard boot switch (as opposed to a soft stand-by switch) and so when in the off position the CPA-50 will draw no mains power. CPA-50 Power Amplifier 7 STEREO BI-WIRING 50+50W rms into 4 Ohms@1%THD HORIZONTAL BI-AMPING (2 Required) 100+100W rms into 4 Ohms@1%THD DRAWMER EXAMPLE WIRING METHODS 8 CPA-50 Power Amplifier 9 VERTICAL BI-AMPING (2 Required) 100+100W rms into 4 Ohms@1%THD STEREO VIA MONOBLOCKS (2 Required) 100+100W rms into 8 Ohms@1%THD DRAWMER CHAPTER 3 CPA-50 GENERAL INFORMATION IF A FAULT DEVELOPS CONTACTING DRAWMER For warranty service please call Drawmer Electronics We will be pleased to answer all application questions Ltd. or their nearest authorised service facility, giving to enhance your usage of Drawmer equipment. full details of the difficulty. A list of all main dealers can be found on the Drawmer webpages. On receipt of this information, service or shipping instructions Please address correspondence to: DRAWMER Electronics LTD will be forwarded to you. Coleman Street No equipment should be returned under the warranty without prior consent from Drawmer or their authorised Parkgate representative. Rotherham For service claims under the warranty agreement a South Yorkshire service Returns Authorisation (RA) number will be S62 6EL issued. United Kingdom Write this RA number in large letters in a prominent position on the shipping box. Enclose your name, Telephone: +44 (0) 1709 527574 address, telephone number, copy of the original sales Fax: +44 (0) 1709 526871 invoice and a detailed description of the problem. Authorised returns should be prepaid and must be insured. Contact via E-mail: firstname.lastname@example.org All Drawmer products are packaged in specially designed containers for protection. If the unit is to Further information on all Drawmer products, be returned, the original container must be used. If dealers, Authorised service departments and other this container is not available, then the equipment contact information can be found on our website: should be packaged in substantial shock-proof www.drawmer.com material, capable of withstanding the handling for the transit. SPECIFICATION Note: These specifications are provisional and may alter slightly upon product release. THD @ 1W THD@25W/8Ohms POWER @ 1% THD BRIDGED POWER @ 1% THD GAIN Balanced CROSSTALK @ 0dBu 1kHz Input voltage for max unclipped output Frequency Response (+/-0.25dBu ) Output Impedance CPA-50 8ohm 0.004 0.025 25+25 Wrms 100W rms 25.7dB <85dB 775mv (0dBu) 20Hz-20kHz 6milli ohms CPA-50 4ohm 0.004 N/A 50+50 Wrms N/A 25.7dB <85dB 775mv (0dBu) 20Hz-20kHz 6milli ohms POWER REQUIREMENTS Nominal rating: ~ 115 / 230 VAC Absolute min/max:~ 90-132 / 180-264 VAC 45-63Hz FUSE 20mm x 5mm, Class 3 Slo-Blo, 250Volt working. Conforming to IEC 127-2 @ 115V T800mA @ 230V T500mA POWER CONSUMPTION @ Idle 6W typ. 8W max at 230VAC Note: the fuse in the inlet has been set to a rating that ensures it will blow before the internal fuse if the amplifier is driven at clipping levels for any significant length of time. This is to prevent the amplifier and/or speakers from being damaged. @ Standby <500mW typical CASE SIZE 184mm(D) x 165mm(W ) x 51mm(H) WEIGHT 1.25kg 10 Ref:1v00B23-02-17 % THD Noise vs Power CPA-50 Power Amplifier 11 DRAWMER Drawmer Electronics Ltd, Coleman St, Parkgate, Rotherham, South Yorkshire, U.K.