Jeff Rowland Design Group 501 Users Manual

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OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

INTRODUCTION
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

Welcome to the Jeff Rowland Design
Group “family” and congratulations on your
purchase of what is unquestionably one
of the world’s finest amplifiers. With its
combination of features such as precision
electronic circuitry, exceptional efficiency,
and accurately machined chassis components throughout, your Model 501 Mono
Amplifier will offer you many years of musically satisfying enjoyment.
Please take a few minutes to read the
remainder of this Owner’s Manual before
proceeding with the installation of the
amplifier. A thorough understanding of
the operational features will allow you

2

to gain the maximum performance and
ease of use for which this amplifier was
designed. Please note that your Model 501
Mono Amplifier serial number begins with
the letters “MD”. This serial number is
located on the rear panel of the chassis.
Please include this number with any correspondence regarding your Model 501
Mono Amplifier. It has been my joy to
create an audio component of enduring
value that reflects the highest ideals of
musical and artistic expression. It is my
hope that these qualities will enrich your
experience and pride of ownership.

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

E - m ail : j rdg @ j e f f ro w land . co m

If you have any additional questions
regarding the installation or operation
of the Model 501 Mono Amplifier, please
contact your authorized Jeff Rowland
Design Group dealer or check the Jeff
Rowland Design Group web site at
www.jeffrowland.com.
Enjoy the music!

Jeff Rowland
President,
Jeff Rowland Design Group

WWW. J E FF R O W L A N D . C O M

T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

P R O D U C T F E AT U R E S
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

• L
syst
r

ut 3
t3r 3r
3 fi ur t 3 s.
ut
r t r st s
sur w t r L 3r CA
t
uts r us .

• r s 3r r 3u
ut r3v s
u v rs 3
t ty w t 3t r
3 3 ts
t s r3u
33 3 s
EMI.
•H
fi
y ICE 3w r
3w r
3 v rs 3 t
33 y
r t s
3ut ut 3w r w t v ry tt
t,
r3 3t s 3
3 3 t
r ts r t v y s
ys
sz .

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

• Mu t st
AC
fi t r
3w r
su y r u s AC
3 s 3 ut 3
t r3u 3ut
fi r s
r u try.

• L3w 3w r 3 su t 3
r ts
3 st t 3w r-u 3 r t 3 t3
t w r -u t .

• CE
r3v s
r 3ut ut t r
s
r qu r 3 t33 s 3r s ur , 3w r s st
3
t 3 s.

•

• Fu y3t

ut

t3 3 3 y
t
3ut ut r u try.

• r3 r t ry sw t - 3
3w r
su y t
3 3 y sur s
3 s st t r 3r
u r
3 r t
AC
3 t 3 s.

•

t

3v r

3 26 3r 32 B.

tr - 3w r s3
, stru tur y
r
ss s, r s 3 r3
s3
3 3 r r t r
6061- 6 u u .

•	

3t N/ FF ut
3ws
fi r st
y 3 r t 3 r3
r 3t s3ur 3r
us 3 t3
3 t t r (A/ ) syst s.

3

PAC K AG E C O N T E N T S
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

Ensure that all of the auxiliary components listed below are enclosed within the shipping carton
and accessory box. Refer to the illustrations and verify that the proper components are included.

WARRANTY REGISTRATION

MODEL 501 MONO AMPLIFIER

4

AC POWER CABLE

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

WARRANTY CARD

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OWNER’S MANUAL

T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

INITIAL INSPECTION
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

Inspect the shipping container for damage. If any portion of the shipping container, packing material,
amplifier, or accessories are damaged or missing, notify your dealer and the shipper (if a claim is to
be made) immediately.
NOTE: M y s

rs r qu r

3t fi t 3

s

t3 wt

24 3urs 3

v ry t3

t r

t

tur 3

s

urr .

Your Model 501 Mono Amplifier has undergone extensive performance evaluations, listening tests,
quality control inspections, and a minimum 72 hour burn-in period prior to shipment and should
therefore be in perfect operating condition upon delivery. If the amplifier does not operate correctly,
please notify your dealer immediately.
We strongly suggest that you save all of the packing materials. If the amplifier is returned to your
dealer or JRDG, the original packing materials must be used for shipment to avoid possible damage.
Neither JRDG nor the shipper can be held responsible for damages incurred during transit if the
original factory packing is not used. All factory returns require that JRDG issue a Return Authorization
(RA) number prior to shipment.

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

5

Maintenance & Cleaning
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

All JRDG products are designed to provide a lifetime of enjoyment
and listening pleasure. The Model 501 Mono Amplifier is uniquely
constructed from a solid block of precision-machined aluminum.
It’s chassis is sealed to prevent dust from entering the interior of
the chassis and thus should never need interior cleaning during the
lifetime of the product. All internal circuitry is maintenance-free such
that no adjustments of any kind are necessary over the lifetime of
the product. If the amplifier is ever in need of service, updating, or
upgrading, it should only be returned to an authorized repair facility
or technician for servicing.

•

s
t
s

•

r3 t
3 t u t s 3u
v r
s3 t 3tt3 3t
w t r 3r fi 3 - s
fi fi s 3 t
r3 t
, us 3
y 3t r
s r t t fi s .

•	
The front panel of the unit is precision-machined in a unique process
that incorporates a diamond tipped cutting tool. This process was refined
over many years to produce an attractive and unique appearance.
Because the surface is not finished in the typical fashion of most
audio and video equipment, there are a few rules that must be kept
in mind when cleaning the equipment.

6

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

3w t
r3 t
,w
s 3 t wt
fi s , t3 ur 3r 6 3 t s
3r tt
t
s r t s r3
rr t sur
3r t
t3 r
3
t y.

t3

ut3 3t v - r
3 yur t3
t. s w r v t
sur
3 t
s

wt
yt
3t r t
v ry
ur tur 3 s . B us 3 t
t
y r
ty

3v r, s

s
3tt3 r r3t t
y ur
3 z fi s
w t s3 t 3tt3 3t (su
s 3 t
s
3t
3r fi ur tur 3 s
r )
wt
w t r.
t r s 3u
r t y t3 t
3t
3t t
ss s. A v ry
st 3r ss
rt t
3 s 3t 3 t
3
y s3 us . I
r
s
t3 t
y ty 3 r s v 3r
r t3 r 3v t
r .
ss s, 3 3t us

E - m ail : j rdg @ j e f f ro w land . co m

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

If you have any questions about the care or cleaning of your Model
501 Mono Amplifier, please contact your dealer or the JRDG factory
before attempting to clean the chassis. The use of a cleanser or
abrasive to clean the chassis that has not been approved by the
factory will almost certainly damage the finish and will not be
covered under warranty.
NOTE: C

r/ 3 s s 3u

r t y t3 t

3t

3t t

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

ss s.

P r ot ec t i o n S ys t e m s
The Model 501 Mono Amplifier is equipped with internal fuses for
pro­tection against excessive AC current draw; however, since no
protection circuitry or system can completely protect a product from
every electrical hazard, certain precautions should be observed.
In the event of severe voltage hazards such as lightning or when the
amplifier will not be used for extended periods of time, the amplifier
should be unplugged from the AC mains to avoid potential damage
to the internal circuitry. All other audio/video system components
should also be disconnected from AC mains power as hazardous
voltages can easily travel throughout an interconnected system.

7

I n s ta l l at i o n , U s e & c a r e
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

Locate the amplifier as close as possible to its final installation point. Allow access to the rear
panel for making connections. Due to it’s design, the Model 501 Mono Amplifier is energy
efficient, eliminating the need for heatsinks or forced-air cooling. As a result, the Model 501
Mono Amplifier can be housed in a cabinet or custom enclosure with no fear of overheating.
The efficient and compact design of the Model 501 allows it to be installed in any number of
music, film and surround sound systems. For connection instructions for use in a typical twochannel stereo system, please see page 11 of this manual.
The main chassis of the Model 501 is precision-machined out of a solid block of aluminum to
create as rigid an enclosure as possible, impervious to lateral and torsional forces. The amplifier
is parti­cularly non-resonant; however, various damping and resonance control accessories
may be used to yield greater audio performance in some audio systems.
RISK OF ELECTRICAL SHOCK!
WARNING: D3 3t tt
t t3
ss t
3v r. D3 s3 w v3 y3ur w rr ty

8

t r 3r 3 t M DEL 501 M N AM LIFIE y r
3u x 3s y3u t3
r3us, 3t t y t

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

3v

t
tr

3tt3
v3 t s.

E - m ail : j rdg @ j e f f ro w land . co m

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

The JRDG Model 501 Mono
Amplifier has been designed to
operate at the highest level of
efficiency and performance in
any normal operating situation;
however, there are a few important use and care principles
that must be kept in mind when
operating the amplifier.

• D3 3t x 3s t
fi r t3
r , 3 stur , 3r x ss v y
3 t 3 s.
•M

•

sur t t t v3 t
3 t
s 3 t
t st
s v3 t
y3ur r .

M3 501 M3 3 A
fi r
ust 3t
3 fi
y w y,
3t r t
3r
t3 3 fi
s rv
u t s r3 J DG.
t rw s , t
t3ry w rr ty
w
t y v3
.

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

• B sur t
fi r 3w r sw t
s tur
3 3r AC 3w r
3r 3
t 3r
s r 3v
s 3
t
y 3u s
r 3r
t r 3
t
s.
•

3 r t t M3 501,
r3 r y r3u
AC r
t
s 3u
us . A 3t t s 3
z r
y r su t t su
3-w r , r3u
AC
r3u
t r
s
t 3r t 3r
t u t s 3
t t3 2-w r
u r3u
AC 3ut t.

•

M3 501 s s
t3 ry w t 3 ust
ts
3r 3 t
t
3r t
t
3 t
3r
r3 u t. D3 3t tt
t t3 3
t
3tt3 3v r 3 t
fi r
r r s rv
ssu s t3 qu fi
rs3
.
v3 t s s t
M3 501
z r 3us.

• B us 3 t
r y fi
y
3 t M3 501, t r s 3
t3 tur t u t 3 w
3t us
x t t
v t 3 s v r v3 t
z r s s
t3
r v 3us y.

9

Signal & power connections
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

The Model 501 Mono Amplifier offers unprecedented compatibility with
associated audio and A/V components. When connecting or disconnecting speaker or interconnect cables, the amplifier Master AC Power
Switch (5) should be turned OFF.

(2) BALANCED SIGNAL INPUT: If you are using balanced XLR interconnects from your source components, they should be connected to
the balanced input connector. The connector unlocking tab must be
pressed to disconnect the XLR inter­connect cable from the amp­lifier.

(1) POWER INDICATOR LED: When the amplifier is connected to
AC mains and the Master AC Power Switch (5) is turned ON, the small
front panel power indicator will illuminate blue. When the Master AC
Power Switch is OFF, the indicator will be off.

NOTE:
23 t
L
A s3, J DG r 3
L t3 CA
t3rs
us . A
fi r
s

3
s
r

t3r s s
v

3t

t

3

3s t v w t r s t t3 s
r 3ut ut 3s t v .
s st
r rr
t 3 3 t r 3
t3 .
r3 J DG
CA, s
t r 3
ts r
y 3 3
ut ty .

4

5

100

2

1

10

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

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6

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

Signal & power connections
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

(3) LOUDSPEAKER OUTPUT: Unscrew the knob that secures the speaker output connector
and pull the securing block out far enough to allow access to the binding posts. Install the
positive (usually red) loudspeaker cable spade terminal to the positive (+) binding post and the
negative spade terminal to the negative (-) binding post. Secure the loudspeaker connections
by tightening the knob securely with your fingers. The Model 501 will only accept spade terminated loudspeaker cables. Banana plugs or bare wire connections can be used but require an
optional clamp available from your JRDG Dealer.
(4) AC INPUT CONNECTOR: Verify that the VOLTS AC input identified on the rear panel near
the AC input socket is the same as the AC mains voltage in your area. If the voltage does not
match, DO NOT CONNECT THE AMPLIFIER TO AC POWER and contact your dealer immediately.
Install the AC Power Cable between the AC input connector and your AC mains outlet.

WARNING: B3t 3s t v
t v 3ut uts
r
tr
y t v w t r s t t3
ss s
/3r syst
r3u
3t t .
r 3r , t s
fi r
3t us
rt
3u s
r
sw t
3 fi ur t 3 s, su
s t 3s us
r t
3 str t 3 s. F ur t3 v3 t s r ut 3 s
y s 3rt t 3ut uts t3 r3u
r su t
t3 t
fi r
w v3 t w rr ty.
C rt su w33 r s
rs w
rv s
s r3
fi r 3ut uts w r qu r
t3
r u try t3
r3 r y s3 t t
fi r 3ut ut.
s 3 t t
J DG 3r 3
t t s ty s 3 su w33 rs.

(5) MASTER AC POWER SWITCH: This switch controls the operating status of the amplifier.
Pressing the “I” symbol on the switch will turn the amplifier ON. Pressing the “O” symbol on
the switch will turn the amplifier OFF.

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

11

Signal & power connections
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

(6) 12V REMOTE TRIGGER: A 1/8” (3.5 mm) mini-plug connector
is provided on the rear panel for remotely switching the amplifier
between Operational and Standby modes. When connected to
another component with the proper circuitry, the amplifier standby
function can be turned ON and OFF remotely in a custom installation,
theater, or automated system setup. (See FIGURE 1)
C3 st t 3v 3 15v DC
(12 DC y
) (t )
Gr3u

(s

v )

FIGURE 1: D t
r qu r
ts

3 12 r

3t tr

NOTE:
s
fi r st
3w r 3r AC

w r t tt
y 3
s.

r

- u

3

t3r

r 3t
tur s
y
st
3 s 3t s 3
t t u t r3

NOTE: I 12 DC sw t
s3ur s 3t v
,t
s 3rt
r u t tw
t “t ”
“s v ” 3 t 1/8”
- u 3
t3r
w
t
fi r t3 t
ANDB M DE.
3v t
s 3rt r u t w r tur t
fi r t3 t
E A I NAL M DE.

12

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

POWER CONDITIONING: AC power conditioners and AC mains power
cables are a common accessory in many high performance audio and
video systems and can be used to improve the quality of reproduction
in certain instances. We have tried to provide the best possible basic
power cord with the Model 501, however many users wish to experiment
with more expensive and esoteric accessories. As we have never found
the perfect or universal power conditioner or cable, it is not possible to
recommend any particular type or brand for use with the Model 501 Mono
Amplifier. Please use your dealer’s help and knowledge as a resource to
select the proper accessories for your individual system needs.
NOTE: Du t3 t
x t 3 y 3w 3w r 3 su t 3 r t
r 3
t t t u t 3t
s 3
t r3 AC
r st
3t r 3 t 3 . It s r 3
t tt
t u t s 3t us .

3 t M3 501, t s
s u ss t s t3
3v 3r
fi r s
y
t3 w

WARNING: r 3us
t3 t r
r u try
3 ur
r3 r y w r 3r
u
r3v AC 3w r 3r s r us . 3ur
r
u r s3ur 3r
s
t t
r3 r
ss3r s 3r y3ur
s. A s3, t u t s u
t3 v3 t
r t r3 t r
st 3 t
, t w r su t s r 3us
w
v3 t w rr ty.

E - m ail : j rdg @ j e f f ro w land . co m

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

S P E C I F I C AT I O N S
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

Output Power, Continuous RMS

500 watts @ 8 ohms, 1000 watts @ 4 ohms

Frequency Response

5 Hz – 45 kHz, 3 dB @ 8 ohms

Peak Output Current

> 45 amps

Dynamic Range

120 dBa

Load Impedance Range

2 ohms – 16 ohms

Input Impedance

40k ohms

THD + Noise, 0.1 watts – 500 watts, 4 ohm

< .1%, Typically .01% @ 1 kHz

CCIF Intermodulation Distortion, 19/20 kHz

< .002%

Damping Factor @ 1 kHz

1000

Overall Gain

Selectable Internal Jumper, 26 or 32 dB

Common Mode Rejection Ratio

> 90 dB, 20 Hz – 20 kHz

Absolute Phase

Non-inverting, Pin 2 Positive

Inputs

1 Balanced XLR
(Unbalanced operation requires an optional XLR to RCA adapter)

Outputs

1 CE-Approved Speaker Wire Clamp

Power Consumption

Idle – 15 watts, Maximum – 1300 watts

Amplifier Weight
Overall Amplifier Dimensions (H) x (W) x (D)

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

17 lbs. / 7.8 kg
3.3” x 8.4” x 14.6”
85 mm x 213 mm x 372 mm

13

DIMENSIONS
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

8.4 in. (213 mm)

2.8 in. (72 mm)
13.0 in. (292 mm)

14.6 in. (372 mm)

3.3 in. (85 mm)

14

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1

O P T I O N A L a d j u s t m e nt s
OW N E R ’ S M A N UA L

MODEL 501 MONO AMPLIFIER

1

adjusting amplifier OVERALL GAIN

2

3
J103

Step 1: Unplug the Model 501 Mono Amplifier power cable
from the wall AC outlet.

(DEFAULT) 26 dB GAIN
1

Step 2: Place the unit upside-down on a soft, clean surface.
Using a #2 Phillips screwdriver, remove the ten screws that
secure the bottom cover of the unit.
Step 3: Locate jumper J103 on the rear panel board of the unit.
Using needle-nose pliers, move the jumper from between pins
2 and 3 to pins 1 and 2. (See FIGURES 1 and 2). Overall amplifier
gain increases to 32 dB.
Step 4: Reinstall the bottom cover and replace the ten screws
to secure it to the chassis.

© J e f f R o w l a n d D e s i g n Gr o u p 2 0 07. A l l R i g h t s R e s e r v e d .

JUMPERS

2

3
J103

(ALTERNATE) 32 dB GAIN

FIGURE 1: L3 t 3 3 Ju
3 t M3 501

r J103 3 t

s

FIGURE 2: C 3s -u 3 J103
s tt s 3r t M3 501

RISK OF ELECTRICAL SHOCK!
WARNING:
stru t 3
r­s3
3 y; 3w v r,
y3urs , J DG
3t
M3 3 A
fi r
us 3 y3ur
501 y r 3v t
3tt3 3v
tr
v3 t s. us, J DG
s 3u y3u u rt
y3 t s

s t ss t3 r
t 3r qu fi J DG s rv
y3u s
us r 33s t3 tt
tt s
ust
ts
3r y
t t y 3 ur t3 y3ur M3 501
t 3 s. Furt r,
ss t
t r 3r 3 y3ur M3
r
x 3s y3u t3
r3us, 3t t y t
3t
3r y ury y3u y sust
ust
ts y3urs .

15

P O B OX 7 2 3 1 , C O LO R A D O S P R I N G S , C O LO R A D O 8 0 9 3 3 U S A

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T E L E P H O N E ( 7 1 9) 47 3 -1 1 8 1



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