Lexicon Power Amplifiers DD 8 User Manual

DD-8 Power Amplifier  
User Guide  
143120-1 - 5/11  
DD-8 Power Amplifiers  
DECLARATION OF CONFORMITY  
Issued By: Harman International.  
FOR FIELD SERVICE  
QUESTIONS CALL:  
1718 W. Mishawaka Rd.  
Elkhart, IN 46517 U.S.A.  
1 800 691 4171  
European Representative’s Name and Address:  
Andy Baker  
Cranborne House, Cranborne Rd.  
Potters Bar, Hertfordshire EN6 3JN  
United Kingdom  
Equipment Type: Power amplifier. Family Name: DD Series. Model Names: DD-8  
EMC Standards:  
EN 55022:2006 + A1:2007 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits;  
Conducted, Class B  
EN 61000-4-2:2008 Ed 2.0 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)  
EN 61000-4-3:2010 Ed 3.2 Radiated, Radio-Frequency, EMC Immunity (Environment E2, Criteria A)  
EN 61000-4-4:2007 Electrical Fast Transient/Burst Immunity (Criteria B)  
EN 61000-4-5:2006 Surge Immunity (Criteria B)  
EN 61000-4-6:2006 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)  
EN 61000-4-11:2004 Voltage Dips, Short Interruptions and Voltage Variation  
EN 61000-3-2:2005 + A1:2008 Limits for Harmonic Current Emissions (equipment input current less than or equal to 16A.  
EN 61000-3-3:2008 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply systems Rated Current less than or equal to 16A  
Safety Standard:  
IEC 60065:2001 Ed 7 +A1:2005 Safety Requirements – Audio, Video, and Similar Electronic Apparatus  
I certify that the product identified above conforms to the requirements of the EMC Council Directive 2004/108/EC and the Low Voltage  
Directive 2006/95/EC.  
Signed  
______________________  
Bob Chadderdon  
Title: Director of Engineering  
Date of Issue: June 1, 2011  
Obtaining Other Language Versions:  
To obtain information in another language about the use of this product, please contact your local Lexicon  
Distributor. If you need assistance locating your local distributor, please contact Lexicon at 888-691-4171.  
This manual does not include all of the details of design, production, or variations of the equipment. Nor does  
it cover every possible situation which may arise during installation, operation or maintenance.  
The information provided in this manual was deemed accurate as of the publication date. However, updates to  
this information may have occurred. To obtain the latest version of this manual, please visit the Lexicon website  
Trademark Notice:  
Lexicon and the Lexicon logo are registered trademarks of Harman International Industries, Inc.  
Later versions of this manual and additional information about this product may be available at the Lexicon  
©2011 by Harman International,  
1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A. Telephone: 800-691-4171.  
Operation Manual  
3
DD-8 Power Amplifiers  
DocumentatIon conventIonS  
This document contains general safety, installation, and operating instructions for the DD-8 Power  
Amplifier. It is important to read this user guide before attempting to use this product. Pay particular  
attention to safety instructions.  
The following symbols are used in this document:  
Appears on the component to indicate the presence of uninsulated, dangerous voltage  
inside the enclosure – voltage that may be sufficient to constitute a risk of shock.  
Appears on the component to indicate important operating and maintenance  
instructions in the accompanying literature.  
Calls attention to a procedure, practice, condition or the like that, if not correctly  
performed or adhered to, could result in injury or death.  
CAUTION  
Calls attention to a procedure, practice, condition or the like that, if not correctly performed  
or adhered to, could result in damage to or destruction of part or all of the product.  
WARNING  
Calls attention to information that is essential to highlight.  
NOTE:  
FCC COMPLIANCE NOTICE  
This device complies with part 15 of the FCC rules. Operation is subject to the  
following two conditions: (1) This device may not cause harmful interference, and (2)  
this device must accept any interference received, including interference that may  
cause undesired operation.  
CAUTION: Changes or modifications not expressly approved by the party  
responsible for compliance could void the user’s authority to operate the equipment.  
NOTE: 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 instruction manual, 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  
harmful interference to radio or television reception, which can be determined  
by turning the equipment off and on, the user is encouraged to try to correct the  
interference by one or more of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and 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.  
4
Operation Manual  
DD-8 Power Amplifiers  
GettInG StarteD  
Thank you for purchasing your new Lexicon DD-8 Multi-room Amplifier. The DD-8 features patented  
DriveCore™ technology, delivering unprecedented levels of power from an amazingly small and  
lightweight product. DriveCore takes more than 500 discrete components typically found in a  
switching amplifier and fuses them onto a single silicon chip about the size of a dime. Coupled with  
a power supply, this chip is capable of generating big output levels into a wide variety of speaker  
loads giving you the flexibility to power almost any speaker from small in-ceilings to large in-room  
floorstanding models.  
In order to receive the maximum peak performance from your Lexicon amplifier, please take a few  
minutes and completely read this manual. This important information will help you make certain that  
your DD-8 is properly configured for operation with the rest of the equipment in your system.  
Highlights  
P
P
P
P
P
P
P
P
P
P
P
P
Multi-patented DriveCore™ amplifier technology  
8-channels each with 125W into 8-ohms, all channels driven  
Four stereo, Eight mono, or any combination stereo/mono channel configuration  
Local/Bus RCA input selection for single or multi-zone configuration  
Stereo/Mono selection and independent channel output level controls  
12V trigger input/output and signal-sensing channel inputs  
Power Save low-power consumption standby mode (less than 0.5W)  
Front panel standby power switch with indicator LED  
Front panel channel status indicator LED’s  
Short-circuit and thermal protection circuitry  
High-efficiency, quiet convection-cooled design  
Lightweight chassis only one rack space (1U) high  
Operation Manual  
5
DD-8 Power Amplifiers  
GettInG StarteD  
Installation Considerations  
To ensure optimal performance, pay particular attention to the instructions below and to other  
precautions that appear throughout this user guide.  
DO install the DD-8 on a solid, flat, level surface such as a table or shelf. The DD-8 can also be installed  
in a standard 19-inch equipment rack using the rack-mount ears included with the product.  
DO select a dry, well-ventilated location out of direct sunlight.  
DO NOT install the DD-8 on a surface that is unstable or unable to support all four feet.  
DO NOT expose the DD-8 to high temperatures, humidity, steam, smoke, dampness or excessive dust.  
Avoid installing the amplifier near radiators and other heat-producing appliances.  
DO NOT install the DD-8 near unshielded TV or FM antennas, cable TV decoders, or other RF-emitting  
devices that might cause interference.  
DO NOT place the DD-8 on a thick rug or carpet, or cover the ventilation holes in the chassis, as this  
might prevent proper cooling.  
DO NOT place the DD-8 on a windowsill or any location exposed to direct sunlight.  
Installation Options  
The DD-8 is shipped without feet or rack ears installed. Both are included in the packaging and you  
will need to install one or the other depending upon the type of installation/mounting required. If the  
DD-8 is to be placed on a shelf or audio furniture, you will need to attach the four plastic feet to the  
bottom of the amplifier using a #2 Philips screwdriver and the included hardware. (See Figure 1) If the  
DD-8 is be mounted into an equipment rack, you will need to attach the two metal rack ears to the left  
and right sides of the amplifier using the included T-10 Torx key. (See Figure 2)  
Figure 1. Feet Installation  
Figure 2. Rack Ears Installation  
NOTE: If multiple DD-8’s are to be rack mounted together, it is acceptable to “flat stack”  
them one atop the other in adjacent rack spaces without additional ventilation spaces  
left in between them. However, in some installations or in heavy usage scenarios where  
multiple channels are consistently driven at high outputs for long periods of time, it might  
be necessary to leave one empty rack space between the amplifiers in order to assist with  
heat dissipation and prevent thermal protection due to overheating.  
6
Operation Manual  
DD-8 Power Amplifiers  
BaSIc operatIon  
Front Panel  
1
2
1. Standby Button  
Activates and deactivates standby mode when the DD-8 amplifier is connected to AC power.  
When the DD-8 is connected to AC power, the standby button LED will glow RED indicating that the  
unit is in the standby mode. In this state, the power amplifier section is not activated and the unit  
consumes minimal AC power. Pressing the standby button from this state will activate the power  
amplifier section and the standby button LED will glow BLUE indicating that the DD-8 is powered on.  
NOTE: When the status of the DD-8 changes or is powered up from standby mode, there  
may be a delay in audio output and relay clicks may be audible. This is normal operation.  
NOTE: If the trigger input is used on the DD-8, it will override the standby button operation.  
2. Channel Status Indicator LED’s  
Indicates the status of each of the eight amplifier channels when the DD-8 is active.  
When a channel is active, its LED indicator will glow BLUE. If the channel is in standby, the LED will be  
off. If a channel has a fault, the LED will blink BLUE indicating the presence of a short or some other  
problem related to that channel. (See the troubleshooting section for more information.)  
Operation Manual  
7
DD-8 Power Amplifiers  
BaSIc operatIon  
Back Panel  
2
5
6
7
8
9
1
3
4
10  
10  
11  
1. Bus Output  
7. Speaker Outputs  
8. Signal Sense On/Off  
9. Power Save On/Off  
10. Trigger In/Out  
2. Bus Input  
3. Local Inputs  
4. Output Level Controls  
5. Stereo/Mono Selection  
6. Local/Bus Selection  
11. AC Main Power Connector  
WARNING: Do not connect the outputs  
of one channel to the outputs of other  
channels or to other amplifiers.  
CAUTION: Never make or break connections  
to the DD-8 unless the DD-8 and all  
associated components are powered off!  
1. Bus Output  
Provides a line-level RCA connector loop/passthru output for connecting multiple DD-8 amplifiers in a  
system utilizing a single bus input signal.  
If the DD-8 is used as a single zone amplifier and the input signal is connected via the Bus Input, that  
signal can be output via this pair of RCA connectors to additional DD-8 amplifiers connected in the  
same manner.  
NOTE: The number of DD-8 amplifiers that can be connected in this manner is limited by the  
output voltage of the signal source device driving the bus input as it must support the total  
impedance of all of the bussed devices.  
2. Bus Input  
Provides a line-level RCA connector input to simultaneously feed all speaker output channels utilizing  
a single bus input signal.  
When the DD-8 is used as a single zone amplifier, all channels can be driven using only the bus input  
without the need for connection to each channel’s local input individually. If the bus input is used with  
the DD-8 configured for stereo operation, the Left input signal will be routed to all four Left speaker  
outputs and the Right input signal will be routed to all four Right speaker outputs.  
If the bus input is used with the DD-8 configured for all mono operation, either the Left or Right Bus  
Input RCA connector can be used to feed all eight speaker outputs. (See the section on “Stereo/Mono  
Selection” for more information.) In this case, using only one input connector will attenuate the gain  
by 6dB. A “Y-adaptor” RCA cable can be used at the input to maintain full gain if desired.  
8
Operation Manual  
DD-8 Power Amplifiers  
BaSIc operatIon  
3. Local Inputs  
Provides a line-level RCA connector input to feed a corresponding speaker-level output channel.  
When the DD-8 is used as a multi-zone amplifier, each channel can be provided with a dedicated input  
signal. The signals from this input will only be available on the corresponding speaker-level output.  
Local inputs are grouped and identified in pairs with the labels A, B, C and D and channel numbers 1-8  
on the rear panel of the DD-8. These labels can be utilized to easily identify corresponding controls  
and connections for selecting desired output configurations.  
4. Output Level Controls  
Provides speaker-level attenuation for each output channel.  
The output level controls function as attenuators for each channel and can be used to level-match  
speakers in an installation. The center detent is the default position that will be appropriate for most  
speakers with +13dB or -76dB of adjustment from default available as needed. These controls are  
labeled in pairs A, B, C and D and with channel numbers 1-8 to easily identify which speaker-level  
output is being adjusted.  
5. Stereo/Mono Selection  
Selects between Stereo and Mono output configuration for each group of speaker output pairs.  
When using the DD-8 in standard stereo operation, select the Stereo position. In this mode, the  
Left and Right stereo input signals remain intact and are output at the corresponding left and right  
speaker connection. The DD-8 provides connectivity for four stereo pair of loudspeakers (A, B, C and  
D) when configured in Stereo mode.  
It is possible to combine a stereo bus or local input signal onto two single output channels by  
selecting the Mono position for that channel pair. This mode is useful for instances where two  
normally stereo speakers are located far apart and it is desirable to send a combined left and right  
channel signal to both speakers simultaneously in order to maintain optimal fidelity.  
If desired, the DD-8 can be utilized in all mono operation. In this mode, all eight channels can be  
used independently with either a single mono bus input signal or eight independent mono local  
input signals. As notated in the bus and local input descriptions, using only one input connector will  
attenuate the gain by 6dB. A “Y-adaptor” RCA cable can be used at the input to maintain full gain if  
desired.  
6. Local/Bus Selection  
Selects between Local and Bus inputs for each group of speaker output pairs.  
The Local/Bus input selection provides the ability to easily configure the DD-8 either as a single-zone  
or multi-zone amplifier. The speaker outputs are grouped in pairs A, B, C and D (channels 1-8) with a  
switch for each pair. For example, selecting the Bus input for speaker output pair A (channels 1 and  
2) will route the input signal from the Bus input to speaker output pair A. Selecting the Local input  
for speaker output pair A (channels 1 and 2) will route the input signal from the Local input pair A  
(channels 1 and 2) to speaker output pair A.  
Operation Manual  
9
DD-8 Power Amplifiers  
BaSIc operatIon  
7. Speaker Outputs  
Provides connection for up to four pair of stereo speakers (eight speakers total) to the DD-8.  
Connection to speakers is provided via phoenix-type connectors that accept bare wire terminations.  
The connectors are grouped in pairs with one connector each for pair A, B, C and D. Each pair  
consists of four wire terminations: positive (+) and negative (–) for the Left channel and positive  
(+) and negative (–) for the Right channel. To attach speaker cables to the phoenix connector, strip  
approximately ¼” of insulation off of the end of the positive and negative leads of the cable and  
insert the bare ends into the corresponding position of the phoenix connector, tightening the screw  
terminals on top to secure the termination. Repeat this procedure for each speaker.  
NOTE: It is recommended to use 16-gauge or larger speaker wire in order to ensure low-  
impedance connections between the amplifier and speakers. Be sure to observe correct  
polarity when making connections to speakers: Positive (+) leads to the Positive (+) terminals  
and Negative (–) leads to the Negative (–) terminals.  
CAUTION: The speaker outputs on the DD-8 are  
balanced (differential) and should not be connected to  
any equipment that grounds the Negative (–) terminals.  
8. Power Save On/Off  
Enables the extreme low-power automatic standby mode of the DD-8.  
The DD-8 is a highly efficient design with lower-than-average power consumption at standby, idle  
and in normal operation mode. The Power Save mode can be enabled to lower standby power  
consumption even further by disabling all circuitry except that required for the front panel standby  
button. If the Power Save switch is set to the On position, the DD-8 will automatically revert to standby  
and enter this extreme low-power state after one hour without signal present at any of the inputs.  
If the Power Save switch is in the Off position and the DD-8 is active, it will remain on indefinitely  
regardless of the presence of input signals until the amplifier is put into standby mode via the front  
panel standby switch.  
NOTE: The Power Save function can only be used when operating the DD-8 from the front  
panel standby button. If a trigger input is being used, it will override the Power Save function.  
9. Signal Sense On/Off  
Enables the audio Signal Sense circuitry for the Bus and Local inputs.  
The Signal Sense circuitry allows the DD-8 to activate a channel (1, 2, 3, 4, 5, 6, 7 or 8) when an audio  
signal is detected at the corresponding input and deactivate a channel (1, 2, 3, 4, 5, 6, 7 or 8) when no  
audio signal has been present for 30 minutes. When the DD-8 is powered on and the Signal Sense  
switch is set to the On position, amplifier channels with signal present will be active. Channels without  
signals present will remain switched off until signals are detected. In this mode, power consumption is  
lowered by switching off idle channels and audio performance is improved by eliminating crosstalk on  
adjacent unused channels. In cases where Signal Sense is On and no audio signals are present on any  
channels for more than 30 minutes, all channels will be switched off and only the front panel standby  
button will glow blue while the DD-8 continues to monitor all inputs for a signal.  
10  
Operation Manual  
DD-8 Power Amplifiers  
BaSIc operatIon  
NOTE: It is possible to have a situation where Signal Sense cannot function if the Power  
Save feature is also used and has been activated. For example, Signal Sense will deactivate  
channels without signals after 30 minutes. If all channels are deactivated, Power Save will  
be enabled after an additional 30 minutes of no signal. During that additional 30 minutes,  
Signal Sense will continue to function and will activate any channels that receive an  
incoming audio signal. Once the Power Save standby mode has been enabled, Signal Sense  
will not be able to function requiring the DD-8 to be turned on again via the front panel  
standby button.  
NOTE: In some cases, audio signals with very low output may not activate the Signal Sense  
circuitry in a timely manner or in some cases, not at all. This could occur with music or audio  
that begins with very soft or quiet passages or with abnormally low-voltage source signals. If  
the Signal Sense circuitry will not reliably activate channels within the DD-8, it is suggested  
to use either the front panel standby button or trigger input control for proper operation.  
10. Trigger In/Out  
Provides connectivity for remote 5-15VDC trigger signals used to activate and deactivate the standby  
mode of the DD-8.  
The Trigger In and Out connections can be used to activate and deactivate the standby mode of  
the DD-8 from devices such as remote control systems, preamplifiers or other external devices. The  
Trigger In and Out connections are duplicated for both 1/8” (3.5mm) mono mini-plug and phoenix-  
style connectors. Use the Trigger In for making connections to external control devices that will  
activate and deactivate the DD-8 standby mode. The Trigger Out does not provide DC power on its  
own, but can be used for making Trigger In daisy-chain connections to additional DD-8 amplifiers or  
other components that need to mimic the DD-8 power state.  
NOTE: When a remote trigger is connected it will override the front panel standby button  
operation.  
To install a trigger cable:  
P
P
P
Power the controlling source and DD-8 amplifier off.  
Connect the trigger cable to the controlling source and the DD-8 amplifier.  
After the connections are made, power on the controlling source and the DD-8 amplifier. After the  
source unit is fully powered up, the LED power indicator on the front of the DD-8 should be lit BLUE.  
P
P
Verify the trigger is working by putting the source unit into standby mode. The DD-8 amplifier after  
a short delay will also go into the standby mode and the power indicator will light up RED.  
Once you have verified that the trigger cable is working, only use the source unit to power on and  
off your DD-8 amplifier.  
WARNING: When installing the trigger cable, never have  
the controlling source or DD-8 amplifier powered on.  
Doing so will cause the trigger device to work improperly  
and could cause damage to both the source and amplifier.  
Operation Manual  
11  
DD-8 Power Amplifiers  
BaSIc operatIon  
11. AC Main Power Connector  
Provides an AC power connection to the DD-8 using the supplied power cord.  
After all audio and system connections have been made, connect the power cord to an AC power  
source. Be sure that any device connected to the remote trigger input is powered off when connecting  
the DD-8 power cord to an AC outlet.  
WARNING: Do not plug the DD-8 directly into the “Switched Accessory” outlet of  
another device! These outlets are intended for use with low current draw products  
such as tuners, CD players, Blu-ray players and other similar devices. These outlets are  
not designed to handle the high current draw of a power amplifier. Using these outlets  
for a power amplifier is a significant safety hazard.  
12  
Operation Manual  
DD-8 Power Amplifiers  
trouBleShootInG anD maIntenance  
Troubleshooting  
The amplifier does not power on.  
1. Attempt to power on the amplifier with the front panel Standby/On button.  
2. Examine the power cord to ensure a good connection between the rear panel AC input  
connector and the wall outlet.  
3. Check the wall outlet.  
The Trigger Input is connected to an external device, but the amplifier does not power on and  
off with the external device.  
1. Verify the trigger cable is connected at both ends and verify that the trigger cable is  
connected to the right device. Also re-verify the trigger installation instructions as  
instructed in the Basic Operation section of this user guide.  
2. Verify the trigger level of the output source device. The DD-8 accepts a range of  
5-15VDC.  
Source signals are present and the system is at a suitable volume level but one or more  
channels are not passing audio.  
1. Reduce system volume level.  
2. Power the DD-8 into standby mode.  
3. Check input connections.  
4. Check speaker connections.  
5. Allow the amplifier to cool before powering it on again.  
Audio sounds “thin” and is lacking proper bass response.  
Check to ensure proper polarity of the speaker cables and connections.  
Audio Levels differ between channels.  
1. Check the level settings of the DD-8 Output Level Controls.  
2. Check the settings on your preamp, processor or controller.  
Audio plays and then cuts off.  
Check input and speaker connections for short circuits or loose connections at the amplifier  
and speaker.  
Operation Manual  
13  
DD-8 Power Amplifiers  
trouBleShootInG anD maIntenance  
A humming sound is present in the audio.  
Audible hum, or a discernable low frequency noise is one of the most common problems within  
audio/video systems. This problem, even when the volume is at a low level, Is usually caused by a  
common problem known as a “ground loop”. A ground loop occurs when there is a difference in  
ground voltages between two or more components that are connected electrically.  
In most cases, one or more of the following suggestions below will solve the hum problem.  
1. If a cable TV connection is present, disconnect the cable for the wall outlet. If this  
eliminates the humming sound, a ground loop isolation device is required. Contact your  
dealer or cable provider for assistance.  
2. Disconnect components one at a time to isolate the problem. Once the problem is  
identified, make sure the associated component is properly grounded and connected to  
the same electrical ground as the DD-8 amplifier.  
3. Turn off all components within your system and then disconnect the input cables on the  
DD-8 amplifier. Turn the amplifier back on. If the hum disappears the fault may be with  
the input cables that are being used. Make sure the cables are properly shielded or use  
a cable that has better shielding. Make sure the cable is not running or laying on top of  
any AC power cords.  
4. Ground loop problems may also be caused by poor grounding of the electrical system  
within your home or may be caused by faulty earth grounds in your home’s electrical  
system. To isolate the problem, try unplugging components with three prong grounded  
power cords one at a time to see if one or all are causing the problem. In the past, cold  
water pipes and other utilities were often used for grounds. These items may not be  
still valid because of corrosion of the existing pipes and the installation and use of PVC  
piping. Please check with a licensed electrician for further evaluation.  
If all else fails…  
1. Contact an authorized Lexicon dealer.  
2. Contact Lexicon Customer Technical Support at 888-691-4171.  
Maintenance  
Routine maintenance should be performed on a periodic basis. Clean the exterior surfaces of the  
unit with a soft, dry, lint-free cloth. Do not use alcohol, benzene, acetone-based cleaners, or strong  
commercial cleaners. Do not use a cloth made with steel wool or metal polish. If the unit is exposed to  
a dusty environment, a low-pressure blower may be used to remove dust from its exterior.  
14  
Operation Manual  
DD-8 Power Amplifiers  
appenDIX  
Specifications  
Specifications are subject to change without notice.  
Output Power:  
125W RMS per channel into 8 ohms from 20Hz – 20kHz  
Frequency Response:  
Total Harmonic Distortion (THD):  
Signal-to-Noise Ratio:  
Crosstalk:  
20Hz - 20kHz +0dB/–1.5dB  
Less than 0.05% at full rated power 20Hz - 20kHz  
< –105dB below rated full power A-weighted  
< –70dB @ 1kHz  
Input Sensitivity:  
Gain:  
1.12 volts for 125W out into 8 ohms  
29dB  
Input Impedance:  
Trigger Input:  
100K ohms typical  
5V minimum – 15V maximum DC  
Dimensions (H x W x D):  
2.1” (w/ feet) / 1.7” (w/out feet) x 17.3” x 14.9”  
5.4 cm (w/ feet) / 4.5cm (w/out feet) x 43.8 cm x 37.8 cm  
Weight:  
9.2 lbs (4.2 kg)  
Power Requirements:  
100 - 240VAC 50/60Hz 190W  
Operation Manual  
15  
DD-8 Power Amplifiers  
THIS PAGE INTENTIONALLY LEFT BLANK  
16  
Operation Manual  

Ricoh S10 24 72MM F25 44VC User Manual
Pioneer Car Stereo System DEH P4700MP User Manual
Orion 5564 User Manual
Nikon TC 16 User Manual
Nikon 8x25DCF User Manual
Lowepro DC E600 User Manual
Life Fitness 90C User Manual
Kenwood KFC 1023C User Manual
Kenwood CT 203 User Manual
JVC TS C421SPGU User Manual