Legacy Powerbloc Series Bedienungsanleitung
Owners Manual For The
Powerbloc
Series Amplifiers
1
Table of Contents
Page
Registration
Owners Record 3
Warranty 4
Safety 5
Care 6
Setup
Connections 7-9
Powering Up 9
Troubleshooting 10
Technology
An Engineer's Perspective 11-12
2
Designer Notes 13-14
Specifications 15-16
Owners Record
Date of purchase: ___________________
Model: Powerbloc
Please Choose: Mono, 2or 4
Serial No: _________________________
3
The serial number is located on the rear of the unit. Record this
number in the space provided below. Refer to this when calling your
dealer regarding this product.
Register your product at www.legacyaudio.com/register
Thank you for listening with Legacy Audio. These hand-crafted
instruments will provide you with many years of listening en-
joyment.
Share your Legacy speakers/electronics with the Legacy
community. Post your Legacy experience and system photos at
facebook.com/legacyaudio . Like the page to receive the latest
Legacy announcements.
• The warranty applies to the original owner and is not transferable.
• The warranty applies to products purchased from an “Authorized Legacy Dealer”.
• The warranty on dealer stock will extend for a maximum of two years from invoice.
The warranty does not cover transportation costs of product to or from the customer, distributor or
dealer, or related shipping damage.
Exclusions from Warranty
The following situations or conditions are not covered by the Legacy Audio warranty:
• Accidental damage, electrical abuse or associated equipment failure.
• Use inconsistent with recommended operating instructions and specifications
• Damage caused by modification or unauthorized service
• Costs associated with the removal and reinstallation of defective products. Consequential damage to
other products.
• Normal wear such as fading of finishes due to sunlight.
Warranty
• The warranty on active components such as digital processors or amplifiers is three (3) years
Legacy Audio supports its customers and products with pride. We cheerfully warrant our amplifiers
from defects in materials and workmanship for a period of seven (3) years. Please register your
product with Legacy Audio. Should you require service Legacy will require a proof of purchase in
order to honor the warranty - so please keep your receipt.
4
Do not block any ventilation openings.
Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
that produce heat.
The power cable should be unplugged from the outlet during severe electrical storms, or when
unused for a long period of time.
Grounding: Adequate precautions should be taken so that the grounding provisions built into an
electrical product are never defeated.
Safety
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT USE THE AMPLIFIER NEAR WATER OR IN WET LOCATIONS, DO NOT EXPOSE IT TO
RAIN OR MOISTURE, DO NOT EXPOSE IT TO DRIPPING OR SPLASHING FROM OTHER
SOURCES, AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS (SUCH AS VASES)
ARE PLACED ON IT. DOING SO MAY RESULT IN DAMAGE TO THE UNIT AND THE RISK
OF ELECTRIC SHOCK, WHICH MAY RESULT IN BODILY INJURY OR DEATH.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER.
NO USER-SERVICEABLE PARTS INSIDE.
5
Care
If you wish to clean your amplifier, use a diluted ammonia based window cleaner. Do not use any
abrasive cleaners or chemical solvents. Take care not to damage the aluminum faceplate, since
aluminum is a medium hardness metal and can be scratched by the careless use of tools during
the installation. Save your box and packing material; they may be necessary for moving or
shipping the unit.
6
Connections
To Right Speaker To Left Speaker
Included IEC power
cable connection
Unbalanced or balanced
connections from preamp or
DAC with volume control
Be certain all associated equipment is turned off before making any connections. Position your
amplifier as near the final location as possible while leaving sufficient access to its rear panel
connectors. To provide for adequate ventilation you should allow at least a couple of inches on
each side of the amplifier. Check that the amplifier is turned off. Insert the power cord into the AC
LINE INPUT on the back panel and then connect it to an appropriate power source.
12Vtrigger connection
Master Power
Switch
Powerbloc2
7
Connections
12Vtrigger connection
Unbalanced or balanced
connections from preamp or
DAC with volume control
Included IEC power
cable connection
Speakers 1 , 2 , 3 , 4
To Positive Binding Post
Speakers 1 , 2 , 3 , 4
To Negative Binding Post
Master Power Switch
Powerbloc4
8
Powering Up
Connections
The Powerbloc Series of amplifiers uses a universal power supply. The included IEC power cable or any other IEC
standardized cable can be utilized.
The 12Vtrigger allows your Powerbloc to interface with the rest of your system. The trigger can receive signals from
your receiver, preamplifier or other gear, to toggle the Powerbloc power off and on with the rest of your system.
Recommended power up sequence is source followed by preamp/processor, then your amplifier. Powering down
should be done in reverse order.
Switch toggled right = always on
Switch toggled left = triggered on/off
Make sure the master power switch at the back of the unit is on by pressing down on the (I). When the (0) is
pressed down, the master power switch is off.
The control switch is located under the display window on the front panel. When the control switch is toggled
to the left, triggered on/off is engaged so the power amp will power on when it receives a signal from the
optional 12V trigger. When the power switch is toggled to the right, the power amp is always on.
9
Symptom
Probable Cause
Solution
No power
Front panel not
illuminated
Power cord is disconnected
Front panel switch toggled to left
position, no 12VDC input
AC fuse is blown
Connect power cord, verify at power strip
Set rear panel switch to on 'I' position
Connect 12 VDC input from source
If not using trigger, toggle front panel switch to right ON
position
Replace rear panel fuse with same rating.
Amplifier won't
trigger on or off
DC trigger source wored in
reverse or voltage too low
Test with 9 Volt batter
Front panel switch toggled to right
position
Toggle to left for triggered control
Power on, but no
sound
Bad connection from preamplifier
or controller
Check input connection or try a different cable or a different
speaker
Over-current protection circuitry
has been activated
Check speaker load impedance. Check speaker wires and
connections. Unplug amplifier for 30 seconds to reset
No signal present
Play CD or other source verifying input selector on preamp.
Streaming is less reliable for this test.
No sound from one
or two channels
Distorted sound
Internal fuse blown on channels'
supply
Internal fuse is degraded
Shorting of output
Rubbing speaker voice-coil
Intermittent contact
Contact Legacy Audio at 800-283-4644
Check speaker cable connections
Verify by driving speaker with different channel
Hum heard from
speakers
Problem with preamplifier or
source component
Disconnect inputs to amplifier with power off, then power on to
verify
Ground loop
Be sure amp is on same power circuit. Isolate with Ebtech
HumX or other ground lifter
Ground loop from cable TV
Install cable isolation device such as the Xantech 634 Ground
Breaker. Refer to www.xantech.com
Top cover feels
unusually warm
Inadequate ventilation
Allow 2" of open space above amplifier. Do not stack without
forced air cirulation
Rear panel power switch set to off
'0' position
Troubleshooting
10
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