Proceed HPA2 User Manual
HPA 2 Po we r Ampl ifie r
PRO C E E D
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CA UTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO
NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to
alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
Marking by the “CE” symbol (shown left) indicates compliance of this device with the EMC
(Electromagnetic Compatibility) and LVD (Low Voltage Directive) standards of the
European Community.
The information contained in the manual is subject to change without notice. The most current version of this manual will
be posted on our web site at http://www.madrigal.com.
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Important Safety Instructions
Please read all instructions and precautions carefully and completely before operating your Proceed power
amplifier .
1. ALWAYS disconnect your entire system from the AC mains before connecting or disconnecting
any cables, or when cleaning any component.
2. This product is equipped with a three-conductor AC mains power cord which includes an earth
ground connection. To prevent shock haza rd, all three connections must ALWAYS be u s ed. If your
electrical outlets will not accept this type of plug, an adapter may be purchased. If an adapter is
necessary, be sure it is an approved type and is used properly, supplying an earth ground. If you
are not sure of the integrity of your home electrical system, contact a licensed electrician for assistance.
3. AC extension cords are not recommended for use with this product. If an extension cord must be
used, be sure it is an approved type and has sufficient current-carrying capacity to power this
product.
4. NEVER use flammable or combustible chemicals for cleaning audio components.
5. NEVER operate this product with any covers removed.
6. NEVER wet the inside of this product with any liquid.
7. NEVER pour or spill liquids directly onto this unit.
8. NEVER block air flow through ventilation slots or heatsinks.
9. NEVER bypass any fuse.
10. NEVER replace any fuse with a value or type other than those specified.
11. NEVER attempt to repair this product. If a problem occurs, contact your Proceed® retailer.
12. NEVER expose this product to extremely high or low temperatures.
13. NEVER operate this product in an explosive atmosphere.
14. ALWAYS keep electrical equipment out of the reach of children.
15. ALWAYS unplug sensitive electronic equipment during lightning storms.
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From all of us at Madrigal Audio Laboratories, thank you for choosing this
Proceed power amplifier.
A great deal of effort went into the design and construction of this precision
device. Used properly, it will give you many years of enjoyment.
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Tabl e of Con tents
Unpacking and Placement ........................................................................ 6
Unpacking .......................................................................................................... 6
Placement .......................................................................................................... 6
Ventilation ...........................................................................................................6
Operating V oltage ...................................................................................... 7
Note the serial number ......................................................................................7
amplifier bottom-panel label..................................................................... 7
A Quick Start................................................................................................ 8
Special Design Features ............................................................................10
Triple monaural design..................................................................................... 10
Low impedance power supply....................................................................... 10
Balanced inputs ............................................................................................... 10
Robust output stage......................................................................................... 10
Extensive protection ......................................................................................... 10
Front Panel .................................................................................................. 11
Rear Panel ..................................................................................................13
communication cable ............................................................................. 14
Remote turn-on tip polarity ...................................................................... 14
Bridged Operation .....................................................................................17
Bridging Explained ............................................................................................17
Balanced Bridging ............................................................................................17
Balanced Bridging Kit ............................................................................... 18
Single-Ended Bridging...................................................................................... 19
Single-Ended Bridging Kit ......................................................................... 20
Biamplification .......................................................................................... 22
Balanced Y-adap t er ................................................................................. 22
Care & Maintenance ................................................................................ 24
U.S. and Canadian Warranty .................................................................... 25
90-Day Limited Warranty.................................................................................. 25
Five Year Extended Warran ty........................................................................... 25
Obtaining Service ..................................................................................... 26
Specifications ............................................................................................ 27
Dimensions ................................................................................................ 28
Rack Mounting .......................................................................................... 29
Installation Notes....................................................................................... 30
Installation Notes........................................................................................31
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U n pac k in g an d P l ac e m en t
Unpacking Unpack your Proceed
for future transport. Shipment of the am plifier with out the original packing
material is not recommended, as it is heavy enough to make improvised packaging impractical. Locate and remove all accessory items from the cartons, and store
the c artons for po s sible future use.
Carefully inspect the product for shipping damage. If you discover any, see your
Proceed dealer immediately.
Placement Your Proceed amplifier may be placed either near the preamplifier/control center
or near the loudspeakers. It may be placed on a shelf or in a cabinet where it is
convenient to operate.
Note that adequate clearance for the AC cord and connecting
cables must be left behind your amplifier. We suggest leaving at
least three inches of free space behind your amplifier to allow all
cables sufficient room to bend without crimping or undue strain.
Ventilation Be sure to allow at least 2 to 3 inches of clearance above your amplifier to allow
heat dissipation through air circulation. The vents on both the bottom and the top
of the amplifier must be kept free from any obstruction which would reduce the
flow of air through the unit. The best rule of thumb is this: if the top of your amplifier is too hot to touch when “idle,” it needs better ventilation. If so, consider
drilling holes in the supporting shelf under the amplifier to promote flow-through
ventilation, or use fans to increase air circulation.
®
HPA 2 Power Amplifier and keep all packing materials
PRECAUTION
Open equipment racks are generally best for power amplifiers, as they allow
ample ventilation. If your amplifier must be located inside a cabinet which restricts airflow, consider using some fans to increase ventilation.
Avoid placement on soft surfaces such as carpeting. If you prefer to have the amplifier on the floor near your loudspeakers, be sure to place it on a firm surface.
(A thick piece of tempered glass under the amplifier is aesthetically unobtrusive
while providing firm support and allowing the required ventilation.)
Mechanical drawings are included in this manual to facilitate special installations
and custom cabinet work (see “Dimensions” at the end of this manual).
For your protection , rev i ew “Important Safety Instructions”
before you install your amplifier.
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Operating Volt age
This Proceed amplifier is factory-set for 100V, 120V, 220V, or 240V AC mains operation at either 50 or 60 Hz, according to the country for which the unit was
manufactured. (230V in European Union countries, in compliance with CE regu-
lations.) Make sure that the label on the rear panel of the amplifier indicates the
correct AC operating voltage for your location. The operating voltage cannot be
changed by the user, and any attempt to do so will void the warranty.
If the voltage indicated does not match the service in your area, see your Proceed dealer.
Note the serial number While you are checking the voltage, it would probably be a good idea to make a
record of the serial number for your amplifier. This can be found on the label
found on the bottom of the amplifier.
amplifier bottom-panel label
WARNING: BEFORE ATTEMPTING TO OPERATE THIS DEVICE,
REFER TO OWNER’S MANUAL FOR PROPER OPERATING
INSTRUCTIONS AND SAFETY PRECAUTIONS. HAZARDOUS
VOLTAGE AVAILABLE INSIDE; DISCONNECT AC – MAINS
CABLE BEFORE OPENING UNIT.
R
PRO C E E D
MADRIGAL AUDIO LABORATORIES, INC.
designed and manufactured in USA
For service, contact Madrigal Audio Laboratories or an Authorized
Dealer. Any modification to this equipment will void all warranties.
No User Serviceable Components Inside.
HPA2
S/N
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A Qu ic k Start
We recognize that many people are understandably eager to begin listening to
their new components, and that reading the manual is often done (if at all) at a
later time—perhaps while listening to music through the new product itself. We
strongly recommend that you read this manual thoroughly.
Fortunately, we can help you get some music up and running on your system
quickly, so that you may begin enjoying your new amplifier while reading more
about it. The goal here is simply to make some music as quickly as possible.
The following procedure assumes that the rest of your system is already connected (e.g., source components to preamplifier).
1 TURN DOWN THE VOLUME ON YOUR PREAMPLIFIER
Turning the volume on the preamp all the way down minimizes the opportunity for unp leasant surprises when f irst powering up your new amplifier.
It does not need to be turned off—merely turned down.
2 SELECT “XLR” OR “RCA” WITH THE “INPUT SELECT” SWITCHES
Each channel of the Proceed HPA 2 Power Amplifier has both balanced
(XLR) and single-ended (RCA) inputs, with a small switch between the two
connectors to select between them. Using these switches, select the appropriate input for each channel, given your interconnecting cables and preamplifier/cont roller ’s capabilities.
3 CONNECT Y OUR PREAMP TO THE AMPLIFIER
Having selected the appropriate inputs in Step 2, now connect the outputs
of your preamplifier to the corresponding inputs on the power amplifier.
4 CONNECT YOUR SPEAKERS TO THE AMPLIFIER
Connect speaker wire from the amplifier to your loudspeakers. Be sure to
maintain consistency in polarity, e.g., the red post on the amplifier to the
red connector on the speaker, and likewise black to black. (Getting the
wires mixed up won’t damage anything, but the sound will be lacking in
bass and the imaging will be quite poor and unstable.)
5 CONNECT THE AC CORD TO THE AMPLIFIER AND TO YOUR AC OUTLET
The AC receptacle for the power cord is located on the right side of the
rear panel, as seen from the front.
6 TURN ON THE AMPLIFIER BY PRESSING POWER, THEN STANDBY
Pre ss the latchin g pow er button on the front panel of the amplifier (small,
near the bottom) to connect the amplifier to the AC mains. The amplifier
will initially power up in standby mode. After five seconds (to let the power
supply charge up), pressing the large silver standby button will bring the
amplifier out of standby into its normal, fully operational mode.
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7 SLOWLY RAISE THE VOLUME ON YOUR PREAMPLIFIER
Congratulations! You should now be able to enjoy your favorite music while
reading the rest of this manual. (Please, do read the rest of this manual. It
contains much valuable information about your new amplifier which we
could not possibly fit onto these two pages.)
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Speci al D esi gn F eat ures
Congratulations on your purchase of a Proceed amplifier! While your new amplifier is straightforward in its use, it includes several design features which are responsible for its outstanding performance. A few of these are given below.
Dual monaural design Consistent with the finest amplifiers, each audio channel of your Proceed HPA 2
has its own, dedicated power supply—including a separate 663 VA toroidal transformer for each channel. The resulting reduction in crosstalk between audio
channels provides superior imaging and reproduction of acoustic space. Demands
placed on one channel have virtually no effect on the performance of the other
channel.
Low impedance power supply A critical factor in the ultimate performance of an amplifier is its “power supply
impedance,” which can be loosely thought of as the freedom with which the audio circuitry has access to the power it needs, when it needs it. The design of
your Proceed amplifier has addressed this important characteristic in a comprehensive fashion. For example, the power supply capacitors (which act as “reservoirs” of power for the amplifier circuitry) are mounted directly to the printed
circuit board rather than using point to point wiring. The layout of the circuitry
uses short, thick traces for high current paths. This attention to detail yields an
optimal environment in which the amplifier may operate to its maximum potential.
Balanced inputs Each channel of your amplifier is individually configurable to receive either bal-
anced or single-ended inputs. This approach allows you to take full advantage of
the greater immunity from noise, RFI, and EMI which balanced transmission of
audio signals off ers on any preamp-to-amplifie r conne ction whe re it is supported.
At the same time, any or all channels of the amplifier may be configured for
single-ended inputs to maintain compatibility with the majority of preamplifiers
available today. The gain structure of the amplifier adjusts automatically when you
select different inputs to facilitate this “mix and match” approach.
Robust output stage Each channel of your P roceed amplifier uses twelve 150 watt power transisto rs.
These transistors are all individually tested and sorted, and are used in matched
sets to ensure that no one transistor bears a disproportionate part of the overall
load . Th e c o m bination o f a n “overbuilt” design specifica tion and e xtraordinary attention to detail in manufa cturing improves performance, reliab ility, and longe v ity.
Extensive protection Your Proceed amplifier will shut itself down if it senses either the presence of
either DC (direct current) or a short circuit at the output, or any unsafe operating
temperature. In any case, a power relay will cause the amplifier to be disconnected from the AC mains. In addition, the AC input to each transformer is fused
to protect against any possibility of component-level failure that could draw dangerous amounts of power. Finally, inrush limiting prevents premature aging of
power supply components during power-up. Once the power supply has been
charged, this in-rush limiting circuitry effectively defeats itself to allow unfettered
power supply access to the AC mains.
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