Madrigal Imaging Stereo Amplifier Dual Monaural Power Amplifier User Manual

Operating Manual  
Mark Levinson®  
Nº29  
Dual Monaural  
Power Amplifier  
Madrigal Audio Laboratories, Inc.  
 
Important safety instructions  
Please read all instructions and precautions carefully and completely before operating your Nº 29  
Dual Monaural 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 hazard, all three connections must ALWAYS be used. 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 Mark Levinson® dealer.  
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.  
 
Thank you for choosing the Mark Levinson® Nº29 Dual Monaural 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.  
 
Table of contents  
Unpacking and placement .......................................................................1  
Unpacking ................................................................................................. 1  
Placement................................................................................................. 1  
Ventilation ................................................................................................. 1  
Custom installations.................................................................................. 1  
Voltage selection ........................................................................................2  
Figure 1: Rear-panel label .................................................................... 2  
Signal connections .....................................................................................3  
Connectors ............................................................................................... 3  
Cables........................................................................................................ 3  
Connection methods and operating modes ....................................... 3  
Single-ended normal (non-inverting) operation................................... 3  
Figure 2: Connections for single-ended normal (non-inverting)  
operation ......................................................................................... 3  
Figure 3: Female input connector ....................................................... 4  
Single-ended inverting operation .......................................................... 4  
Figure 4: Connections for single-ended inverting operation ........... 4  
Balanced normal (non-inverting) operation......................................... 5  
Figure 5: Connections for balanced normal (non-inverting)  
operation ......................................................................................... 5  
Speaker connections .................................................................................6  
Speaker cables ......................................................................................... 6  
Lug connection ........................................................................................ 6  
Figure 6: Spade and hook lugs ............................................................ 6  
Pigtail connection .................................................................................... 6  
Figure 7A: Pigtail connection............................................................... 6  
Figure 7B: Pigtail connection ............................................................... 7  
Figure 7C: Pigtail connection .............................................................. 7  
Connecting the speakers ........................................................................ 7  
Power connection .......................................................................................8  
Connecting the AC power cord ............................................................ 8  
Figure 8: AC power cord polarity ........................................................ 8  
Performance tips ...................................................................................... 8  
Protection circuitry ................................................................................... 8  
Bridged operation .......................................................................................9  
Balanced bridged operation.................................................................. 9  
Figure 9: Connections for balanced bridged operation ................. 9  
Figure 10: Balanced bridging cable ................................................. 10  
Single-ended bridged operation ......................................................... 10  
Figure 11: Connections for single-ended bridged operation ........ 10  
Figure 12: Single-ended bridging cable ........................................... 11  
Care and maintenance ...........................................................................12  
Cleaning .................................................................................................. 12  
Fuses ......................................................................................................... 12  
Specifications ............................................................................................13  
Dimensions.................................................................................................14  
Figure 13A: Dimensions, Nº29, top view ............................................ 14  
Figure 13B: Dimensions, Nº29, side view............................................ 14  
 
Unpacking and placement  
Unpack your Nº29 amplifier and keep all packing materials for future  
transport.  
Unpacking  
To avoid damaging the connectors on input cables attached to  
the rear panel, NEVER rest the Nº29 on the rear panel, and  
NEVER tip it back in a way that would put stress on these  
connectors.  
PRECAUTION  
Carefully inspect your Nº29 for damage and flaws. If you find any, see  
your Mark Levinson dealer immediately.  
Placement  
Ventilation  
To keep speaker cables as short as possible, place the Nº29 as close to  
the loudspeakers as practical.  
Place the Nº29 at least three feet from the turntable and preamplifier.  
Otherwise, the Nº29 may induce hum into these sensitive components.  
The Nº29 may be placed in a cabinet or on a shelf, but adequate  
ventilation must be provided to prevent overheating. The clearance  
provided by the unit's feet must be maintained to ensure unrestricted  
air flow across the bottom of the chassis. (Placing the Nº29 on  
carpeting, for example, may prevent adequate air circulation.)  
Clearance above the unit must also be maintained to allow air  
circulation and to prevent heat buildup.  
The Nº29 incorporates thermal sensors located near each group of  
output devices. If the internal heatsink temperature becomes  
excessive, these sensors will shut off the amplifier before damage  
results. After a brief cooling period, the amplifier can be reactivated  
via the front-panel switch. If this occurs regularly during normal use, it's  
an indication that the ventilation provided for the amplifier is  
inadequate. If there's adequate ventilation and the problem  
continues, see your Mark Levinson dealer immediately.  
Custom installations For those involved in custom installations and cabinetry, this  
information may be useful:  
All temperature measurements are made at the bottom of the  
internal heatsink, 2 inches above the chassis floor.  
Normal heatsink temperature at idle after warmup with  
unrestricted airflow at 22°C (72°F) ambient temperature: 35°C  
(95°F).  
Maximum permissible heatsink temperature before thermal  
protection is activated: 80°C (176°F).  
Drawings are included in this manual to facilitate special installations  
and custom cabinetry (see "Dimensions").  
For your protection, review "Important safety instructions" before  
you install your Nº29.  
PRECAUTION  
1
 
Voltage selection  
The Nº29 is factory-set (internally) for 100V, 120V, 200V, 220V, or 240V  
AC mains operation. Check that the label on the rear panel of the  
amplifier indicates the correct AC operating voltage for your location.  
Figure 1: Rear-panel label  
Voltage  
®
Nº 29  
+
+
OUTPUT  
INPUT  
indication  
DUAL MONAURAL AMPLIFIER  
BALANCED  
INPUT  
BALANCED  
INPUT  
OPERATING VOLTAGE:  
90 110 VAC~  
105 125 VAC~  
180 220 VAC~  
210 240 VAC~  
230 250 VAC~  
~47 400 HZ  
INPUT  
INPUT  
RIGHT CHANNEL LEFT CHANNEL  
WARNING:  
HAZARDOUS VOLTAGES AVAILABLE INSIDE: DISCONNECT AC~ MAINS CABLE BEFORE REMOVING ANY  
COVERS. HIGH ENERGY AVAILABLE AT LOAD TERMINALS: REFER TO OWNER'S MANUAL FOR PROPER  
TERMINATION INSTRUCTIONS. DISCONNECT AMPLIFIER FROM AC~ MAINS BEFORE REPLACING FUSES.  
MAINS FUSES: PLEASE CONSULT OWNER'S MANUAL.  
D E S I G N E D A N D M A N U F A C T U R E D I N U . S . A . B Y  
SERIAL NO.  
M A D R I G A L A U D I O L A B O R A T O R I E S , I N C .  
If the voltage indicated is incorrect, see your Mark Levinson dealer.  
If you wish to change the AC operating voltage of your Nº29, see your  
Mark Levinson dealer.  
A Nº29 may be powered by a 15-ampere AC mains line. If other  
devices are also powered from the same AC feed, their additional  
power consumption must be considered.  
The Nº29's fuses are located on the rear panel. Replace the fuses with  
the same type only.  
ALWAYS remove the AC cord before removing the fuses.  
PRECAUTION  
2
 
Signal connections  
Connectors The Nº29 incorporates RCA-type and XLR-type connectors for audio  
signal input.  
The Madrigal-designed RCA-type connectors used for single-ended  
audio interconnection are a great improvement over ordinary RCA-  
type connectors. The gold-plated XLR-type connectors employed are  
of European design, and are made to professional application  
standards.  
Cables For connecting the Nº29 to a preamplifier, we recommend Madrigal  
Audio Laboratories HPC Interconnect Cable. HPC is available in  
various lengths, pre-terminated with RCA, XLR, and Camac  
connectors. For more information, see your Mark Levinson dealer.  
The Nº29 can be operated in either single-ended or balanced mode.  
In each of these modes, the Nº29 can be operated either normally  
(non-inverting) or inverting.  
Connection methods and  
operating modes  
This manual describes the connections for single-ended normal (non-  
inverting), single-ended inverting, and balanced normal (non-  
inverting) operation. If you have questions about these or other  
methods of signal connection, see your Mark Levinson dealer.  
Before making any signal or speaker connections, make sure  
that the Nº29 is disconnected from your preamplifier and from  
the AC mains.  
PRECAUTION  
Single-ended normal Typical audio systems require that the amplifier be of the non-inverting  
(non-inverting) operation type. This means that the output signal of the amplifier will be in phase  
with the input signal.  
For this type of operation, connect the main outputs of the  
preamplifier to the appropriate (left and right channel) RCA-type  
inputs (non-inverting) on the rear panel of the Nº29. Be sure that the  
shorting strap is inserted into the XLR-type connectors between Pins 1  
and 3.  
Figure 2: Connections for  
single-ended normal  
(non-inverting) operation  
Nº29  
+
+
+
+
PUSH  
PUSH  
Shorting strap  
Right  
Loudspeaker  
Left  
Loudspeaker  
Right  
channel  
Left  
channel  
From preamplifier main output  
3
 
Single-ended inverting Inverting operation should be used if a phase reversal is required. In  
operation this mode of operation, the output signal of the amplifier will be 180°  
out of phase with the input signal. This may be required if one  
component in the system inverts the signal and absolute phase at the  
loudspeaker is desired.  
For inverting operation, the main output cables of the preamplifier  
must be connected to the XLR-type inputs on the rear panel of the  
Nº29. The pin assignments of these connectors are:  
PUSH  
Figure 3: Female input  
connector  
Pin 1: Signal ground  
Pin 2: Signal + (non-inverting)  
Pin 3: Signal (inverting)  
2
1
3
Connector ground lug: chassis ground  
Connect the XLR-type male line-mount connector to the preamplifier  
main output cable so that signal "hot" (+) connects to Pin 3 and signal  
ground connects to Pin 1. Be sure to also connect Pin 2 to Pin 1 inside  
the XLR-type male line-mount connector with a piece of copper buss  
wire (or similar material) at the amplifier end of the cable.  
Note: If you prefer not to connect Pin 2 to Pin 1 inside the XLR-  
type male line-mount connector, pre-shorted RCA-type input  
connectors are available from your Mark Levinson dealer. Insert  
one of these connectors into each of the RCA-type inputs (non-  
inverting) on the rear panel of the Nº29.  
After completing the cables, connect the main outputs of the  
preamplifier to the left- and right-channel XLR-type inputs on the rear  
panel of the Nº29. Be sure to remove the shorting strap between Pins 1  
and 3 before inserting the output cable connectors.  
Figure 4: Connections for  
single-ended inverting  
operation  
Nº29  
+
+
+
+
PUSH  
PUSH  
Right  
Loudspeaker  
Left  
Loudspeaker  
Right  
channel  
Left  
channel  
From preamplifier main output  
4
 
Balanced normal If your preamplifier is equipped with a balanced main output, it's best  
(non-inverting) operation to wire the Nº29 for balanced operation, particularly if long cable  
lengths are required between the preamplifier and the Nº29. (See  
Figure 3 for the pin assignments of the Nº29's XLR-type inputs.)  
Connect the XLR-type male line-mount connector to the preamplifier,  
carefully observing pin assignments. (Refer to your preamplifier's  
operating manual to verify that the pin assignments of its output  
correspond to the diagram above. If they don't, wire the connector so  
that the appropriate output pin connects to the equivalent input pin.)  
When complete, connect the main outputs of the preamplifier to the  
left- and right-channel XLR-type inputs on the rear panel of the Nº29.  
Be sure to remove the shorting strap between Pins 1 and 3 before  
inserting the output cable connectors.  
Note: For proper balanced operation, no connector (pre-  
shorted or otherwise) should be inserted into the RCA-type  
inputs on the rear panel of the Nº29.  
Nº29  
Figure 5: Connections for  
balanced normal  
+
+
+
+
(non-inverting) operation  
PUSH  
PUSH  
Right  
Loudspeaker  
Left  
Loudspeaker  
Right  
channel  
Left  
channel  
From preamplifier  
balanced  
main output  
5
 
Speaker connections  
NEVER connect the Nº29's output terminals to any device other than a  
PRECAUTION  
loudspeaker.  
NEVER short-circuit the amplifier output terminals.  
PRECAUTION  
PRECAUTION  
NEVER connect the left-channel output terminals to the right-channel  
output terminals.  
Speaker cables The Nº29 is equipped with gold-plated, high-current, five-way binding  
posts for output termination to a loudspeaker system. To take full  
advantage of the sonic quality of the Nº29, we recommend using  
high-quality speaker cable. See your Mark Levinson dealer for  
recommendations.  
Lug connection There are two recommended methods for connecting speaker cables  
to the Nº29. A high-quality spade- or hook-type lug, soldered to the  
cable, is best.  
Figure 6: Spade and  
hook lugs  
Spade lug  
Hook lug  
We confidently recommend Madrigal binding-post lugs, made of  
oxygen-free copper with gold-over-silver plating. These lugs are  
available for round cable; see your Mark Levinson dealer for more  
information.  
Many lug connectors are designed to be crimped onto the cable.  
However, soldering will ensure a better electrical connection.  
Note: If you have no experience in soldering, see your Mark  
Levinson dealer for assistance.  
Pigtail connection  
The "pigtail" is another method of connection which uses a short piece  
of 14-gauge wire soldered to the speaker cable. The other end of this  
14-gauge wire is inserted through the hole in the five-way binding  
posts on the rear panel of the Nº29.  
1. Begin with 3" of 14-gauge copper wire.  
2. Strip 5/8" of insulation from one end, and strip 1/2" of insulation  
from the opposite end:  
5/8"  
(15.8mm)  
1/2"  
(12.7mm)  
Figure 7A: Pigtail  
connection  
14-gauge wire  
3"  
(76.2mm)  
6
 
3. Strip 1/2" of insulation from the speaker cable.  
4. Gently slide the (5/8") bare end of the 14-gauge wire into the  
center of the bare speaker cable (be careful not to spread the  
individual wires of the speaker cable).  
1/2"  
(12.7mm)  
Tin  
Figure 7B: Pigtail  
connection  
Speaker cable  
Solder  
5. Solder this connection. A high-wattage soldering gun may be  
necessary to provide adequate heat.  
6. Lightly "tin" the remaining (1/2") bare end of the 14-gauge wire.  
7. Gently slide a 1" length of shrink tubing over the connection and  
heat to shrink. (Color-coded shrink tubing is available for polarity  
identification.)  
Figure 7C: Pigtail  
connection  
5/8" (15.8mm) shrink tubing  
8. Follow this procedure for the remaining speaker connections.  
Depending upon the type of speaker terminal, this procedure may  
also be used for the speaker end of the cable.  
When the speaker cables are complete, connect the left-channel +  
(positive or red) output post of the Nº29 to the + (positive or red) input  
terminal of the appropriate loudspeaker.  
Connecting the speakers  
Connect the left-channel (negative or black) output post of the Nº29  
to the (negative or black) input terminal of the appropriate  
loudspeaker.  
Repeat this procedure for the right channel.  
Note: The Nº29 provides two sets of output posts to  
accomodate the increasing number of loudspeakers that call  
for bi-wiring. For specific instructions on bi-wiring, refer to your  
loudspeaker owner's manual or see your Mark Levinson dealer.  
For the best sonic peformance, we recommend against using  
the two sets of output posts to connect two sets of full-range  
loudspeakers. Doing so, however, won't damage the Nº29, as  
long as the total load impedance is at least 2.  
7
 
Power connection  
After making your loudspeaker connections, apply power to your  
preamplifier and allow it to stabilize. (Mark Levinson preamplifiers, for  
example, require about one minute to stabilize.)  
Connect the AC power cord (included in the accessory pack) to the  
AC connector on the rear panel of the Nº29, then to the AC mains  
outlet.  
Connecting the  
AC power cord  
To Nº29  
To AC mains  
Figure 8: AC power cord  
polarity  
1 = Line (hot)  
1
2
1
2
2 = Neutral  
3 = Earth ground  
3
3
Turn on the Nº29 by setting the power switch on the front panel to the  
"|" (on) position.  
Note: You may hear a transient "click" or "pop" through your  
speakers a few seconds after you operate the Nº29's power  
switch. This noise is normal and won't damage your speakers.  
The Nº29 won't achieve its sonic potential right away its sonic  
performance is close to the optimum after about 100 hours of use. For  
the best performance, you may leave your Nº29 powered at all times,  
except when you won't be using it for a long period (see "Important  
Safety Instructions").  
Performance tips  
The Nº29 is designed to be "power-cycled" (that is, turned on and off)  
without affecting its longevity. After the amplifier is turned on after  
being left unpowered, allow for about one hour of warmup before  
expecting optimal sonic performance.  
Under certain conditions (an electrical malfunction or inadequate  
ventilation), the Nº29's protection circuitry may activate, turning off the  
amplifier before damage results. When this happens, the power switch  
on the front panel will be set automatically to the "O" (off) position.  
After a brief cooling period, you can reactivate the amplifier by  
setting the power switch to the "|" (on) position.  
Protection circuitry  
If this occurs regularly during normal use, see your Mark Levinson  
dealer immediately.  
Note: While the protection circuitry is active, the power switch  
won't stay in the "|" (on) position. If, after the amplifier has  
cooled, the power switch still won't engage, the protection  
circuitry still detects a malfunction; see your Mark Levinson  
dealer immediately.  
8
 
Bridged operation  
When greater power output is desired, the Nº29 may be bridged for  
monophonic operation into load impedances of at least 2.  
Note: Make sure the loudspeaker is rated to handle high power  
levels. For example, a bridged Nº29 driving an 8loudspeaker is  
capable of delivering 200W RMS.  
For the best bridged performance, we recommend balanced  
interconnection. If your preamplifier provides balanced output, follow  
the steps below.  
Balanced  
bridged operation  
Nº29  
Figure 9: Connections for  
balanced bridged  
operation  
+
+
+
PUSH  
PUSH  
Loudspeaker  
Balanced  
bridging cable  
From preamplifier  
balanced main output  
1. For balanced bridged operation, you'll need a special three-  
ended cable. You may fabricate such a cable according to  
Figure 10; it's also available through your Mark Levinson dealer as  
part of a balanced bridging kit.  
Note: If fabricating the cable, be sure to use high-quality  
audio interconnect cable (such as Madrigal HPC).  
Connect the bridging cable's female XLR-type connector to the  
appropriate channel of your preamplifier's balanced main output.  
9
 
Figure 10: Balanced  
bridging cable  
1
2
XLR female  
line-mount  
(rear view)  
3
Signal ground  
(shield)  
Left-channel  
XLR male  
wtsedpair  
T
line-mount  
(rear view)  
Right-channel  
XLR male  
2
1
Signal ground (shield)  
Twisted pair  
line-mount  
(rear view)  
3
2
1
3
2. Connect the bridging cable's male XLR-type connectors to the  
Nº29's left- and right-channel XLR-type input connectors, taking  
care to insert the correct cable end into its designated channel.  
3. Connect the left-channel + (positive or red) output post of the  
Nº29 to the + (positive or red) input terminal of the appropriate  
loudspeaker. Connect the right-channel + (positive or red) output  
post of the Nº29 to the (negative or black) input terminal of the  
same loudspeaker.  
4. Repeat this procedure for the other Nº29 to be bridged.  
If your preamplifier provides only single-ended output, follow the steps  
below.  
Nº29  
Figure 11: Connections for  
single-ended bridged  
operation  
+
+
+
Bridging  
cable  
PUSH  
PUSH  
Left  
channel  
Loudspeaker  
From preamplifier  
main output  
1. Connect the appropriate channel of your preamplifier's single-  
ended main output to the left-channel RCA-type input on the  
rear panel of the Nº29.  
10  
 
2. Connect the bridging cable between the left- and right-channel  
XLR-type input connectors, taking care to insert the correct cable  
end into its designated channel. You may fabricate such a cable  
according to Figure 12; it's also available through your Mark  
Levinson dealer as part of a single-ended bridging kit.  
Note: If fabricating the bridging cable, be sure to use high-  
quality audio interconnect cable (such as Madrigal HPC).  
22-guage  
buss wire  
Figure 12: Single-ended  
bridging cable  
2
1
Signal ground (shield)  
Left-channel  
XLR male  
line-mount  
(rear view)  
3
2
1
Right-channel  
XLR male  
line-mount  
(rear view)  
3
Signal hot (center conductor)  
22-guage  
buss wire  
3. Connect the left-channel + (positive or red) output post of the  
Nº29 to the + (positive or red) input terminal of the appropriate  
loudspeaker. Connect the right-channel + (positive or red) output  
post of the Nº29 to the (negative or black) input terminal of the  
same loudspeaker.  
4. Repeat this procedure for the other Nº29 to be bridged.  
11  
 
Care and maintenance  
To remove dust from the cabinet of the Nº29, use a feather duster. To  
remove dirt and fingerprints, use isopropyl alcohol applied to a soft  
cloth.  
Cleaning  
Poor connections cause sonic degradation. We recommend,  
therefore, that you clean all speaker connection with denatured  
alcohol at least once a year. Consult your Mark Levinson dealer for  
other ways to optimize connections.  
Fuses  
The Nº29's fuses are located on the rear panel. Replace the fuses with  
the same type only.  
ALWAYS remove the AC cord before removing the fuses.  
PRECAUTION  
12  
 
Specifications  
The correlation between published specifications and sonic quality is  
unreliable. A list of numbers reveals virtually nothing. All technical  
measurements must be subject to qualitative as well as quantitative  
interpretation.  
Measurements of the Nº29 yield excellent results by any standards.  
However, only those specifications that apply to the actual operation  
of the amplifier are included here.  
Rated power: 50W minimum continuous sine wave power into 8,  
with both channels driven from 20Hz to 20KHz with no more than  
0.1% THD (FTC). 100W minimum continuous sine wave power into 4Ω  
with both channels driven from 20Hz to 20KHz with no more than  
0.2% THD (FTC).  
Peak output voltage: 30 volts @ rated line voltage @ 8Ω  
Frequency response: (-3dB) 4Hz, 122KHz  
Input impedance: 50Kshunted by 1.5nF  
Voltage gain: 26dB  
Power consumption: Typically 100W @ idle, 200W @ rated power, 8Ω  
Overall dimensions: See "Dimensions"  
Shipping weight: 39.25 lbs. (17.8kg)  
Connector complement: Two RCA-type connectors  
Two XLR-type connectors  
Eight five-way binding posts  
One IEC mains connector  
For more information, see your Mark Levinson dealer, or contact:  
Madrigal Audio Laboratories, Inc.  
2081 South Main Street (Route 17), P.O. Box 781  
Middletown, Connecticut 06457 USA  
Telephone (203) 346-0896  
(FAX (203) 346-1540  
If purchased in North America, this Mark Levinson products warranty is owner-transferable.  
Warranty conditions are valid only in the country where the product was originally purchased.  
For warranty information and conditions on products purchased outside of North America,  
contact your local dealer or regional distributor.  
13  
 
Dimensions  
1/8"  
(3.2)  
Figure 13A: Dimensions,  
Nº29, top view  
1-3/4"  
(44.5)  
1-7/16"  
TYP.  
(36.5)  
17-1/4"  
(438.2)  
4-29/64"  
(113.1)  
17-1/2"  
(444.5)  
1" TYP.  
(25.4)  
1-9/16"  
(39.7)  
2-53/64"  
(71.8)  
1-3/32"  
(27.5)  
4-1/8"  
(104.8)  
3/8"  
(9.5)  
14-3/16"  
(360.4)  
29/32"  
(23.0)  
21/32"  
(16.7)  
Figure 13B: Dimensions,  
1-7/16"  
(36.5)  
Nº29, side view  
3-45/64"  
(94.1)  
5-7/8" 5-1/4"  
(174.8) (133.4)  
6-11/16"  
1-5/8"  
(41.3)  
169.9)  
5/8"  
(15.9)  
2-21/64"  
(59.1)  
13/16" 7/64"  
(20.7) (2.8)  
14  
 
MADRIGAL AUDIO LABORATORIES  
2081 South Main Street, P.O. Box 781  
Middletown, Connecticut 06457 USA  
Telephone: (203) 346-0896  
Fax: (203) 346-1540  
®
is a registered trademark of Madrigal Audio Laboratories, Inc.  
©1993 Madrigal Audio Laboratories, Inc. All rights reserved.  
630042-1  
Printed in U.S.A.  
 

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