O p e ra tin g Ma n u a l fo r th e So n ic Fro n tie rs Po w e r 2 Ste re o Am p lifie r
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Un p a ck in g
At this point we can assume that you have successfully opened the box flaps and found
this manual. The box was designed to ensure the safe transport of the amplifier, Sonic
Frontiers strongly recommends the storage of the Power 2 box in a safe, dry place. In the
event that the amplifier may have to be shipped in the future, the original box is the best
means for the protection and safety of the Power 2 during transportation.
You may want to enlist a friend’s help to remove the amplifier from the box, the weight
can make this awkward (hint: the back of the chassis is the heavy end). Here is a chart
listing what you will find in the box:
Pa ck a g e d Ite m s
Tube Complement:
8-6550C or KT88
6-6922
2-5687
Slot Screwdriver
Phillips Screwdriver
Biasing Tool
1
1
1
1
2
Power Cord
Pearl Tube Coolers
(with O rings)
Cotton Gloves
Extra Fuse
1 pair
2
1
1
1
1
Amplifier
Tube Cover
Warranty Card
Operating Manual
If after your inspection of the contents there is a discrepancy, contact your dealer or
Sonic Frontiers immediately.
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Q u ick Se tu p
At this point we urge you to read and understand this manual in its entirety. But if you
desire immediate action and have skill and/ or past experience with tube hardware, fol-
low these steps.
1. Place the amp on a hard flat surface that will not impede airflow under the amplifier’s
chassis (carpeting or area rugs are N O T acceptable as hard surfaces).
2. Ensure the Power 2 is in Mute mode (these selector switches are on the rear of the
chassis). When disconnecting and connecting cable, placing the amplifier in Mute is an
excellent practice.
3. Tube bias was set at the factory prior to shipment. Tubes are also marked for their cor-
responding socket location. Carefully inspect each and install appropriately. Check
In sta llin g th e Tu b e s and Bia sin g o f th e Po w e r Tu b e s (a must read) for further
clarification.
4. Connect your preamplifier’s left and right balanced or single-ended outputs to the left
and right inputs of the amplifier.
5. Connect the speakers to the positive (+) red and negative (-) black output binding
post. N o te : It is n o t re co m m e n d e d to o p e ra te a n y tu b e a m p lifie r w ith o u t
its sp e a k e r lo a d co n n e cte d .
6. Select the input for use via the selector switch: XLR-Balanced, Single-Ended Non-
Inverting, Single-Ended Inverting .
7. Power up your system turning the power amplifier on last ensuring that both green
LEDs are on (no Standby or Mute activation). Allow 5 minutes of warm up before
operation.
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Re fe re n ce Dia g ra m s
This drawing is referred to
as the “Tube Top” within
the instructional text.
Tube locations V1 to V3 and LV1 to LV3 indicate placement for the six 6922 tubes.
Tube locations V4 and LV4 indicate placement for the two 5687 tubes.
Locations V5 to V8 and LV5 to LV8 indicate placement for the 6550C/ KT88 power tubes.
A
B
Holes on the Tube Top labeled “ A” are LED indicators for the bias of the power
tubes situated nearest.
Holes labeled “ B” are the location of the bias controls. The bias controls adjust the
bias of the tube which they are joined to by the lines. Direction arrows around the
controls indicate the rotation of the control to INCREASE the bias of the power
tubes.
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This drawing is referred to
as the “Front Panel” within
the instructional text.
This drawing is referred to
as the “Rear Panel” within
the instructional text.
C
D
E
Power Switch
Standby Switch
Power LED (Green - Power; Red - Mute; Orange (Red + Green)
- One Channel in Mute)
F
Standby LED (Green - Operate; Red - Standby)
Detachable IEC Power Cord Socket
G
H
I
Fuse Location
Left and Right Channel Input Selector Switches
Left and Right Channel Balanced XLR Inputs
Left and Right Channel Single-Ended RCA Inverting Inputs
Left and Right Channel Single-Ended RCA Non-Inverting Inputs
Left and Right Channel Ground Posts
J
K
L
M
N
Left and Right Channel Loudspeaker Binding Posts
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In sta llin g th e Tu b e s
Be sure the amplifier is OFF (Power Switch Out) before installing any tubes or when any
of the tube sockets are empty.
Wearing the cotton gloves provided with the amplifier when handling tubes will prevent
skin oils from depositing on the glass surface of the tubes. The oils could cause the tubes
to become “gassy” and fail prematurely.
Inspecting the tube boxes that come with the amplifier, you will notice that the boxes and
power tubes themselves are labeled to corresponding sockets also labeled on the tube
top surface. See Reference Diagrams for further clarification. Insert each tube in the cor-
responding socket.
Starting with the 9 pin small signal tubes (the 6922s and 5687s), pay extra attention to
the tube pins and socket holes for these tubes. You will notice an open space where an
imaginary tenth pin or hole would be. This is for proper tube alignment. Be sure pins are
in line with holes when installing tubes. Gently rock the tube into the socket until the tube
is firmly seated. The 6922 tubes are inserted into sockets designated V1 to V3 and LV1
to LV3. The 5687 tubes are inserted into sockets V4 and LV4.
Note the larger space
between two of the pins and
holes for proper alignment of
tube and socket.
DO N O T PLACE 6 9 2 2 TUBES IN A 5 6 8 7 SO CKET O R A 5 6 8 7 TUBE IN
A SO CKET DESIGN ATED FO R A 6 9 2 2 TUBE. THIS CO ULD RESULT IN
DAMAGE TO THE TUBE, AMPLIFIER (O R BO TH) THAT W O ULD N O T BE
CO VERED UN DER WARRAN TY.
The 5687 tube is designed to run very hot. In its implementation in the Power 2, it is
being used at 1/ 3 its ratings. Even at this rating, the 5687 still gets hot and therefore,
the 2 P e a r lT M Tu b e coolers should be installed over the 5687 tubes. The chassis has been
designed with larger holes to accommodate these essential devices to keep these tubes
“comfortable” and allow efficient operation. Just slide the coolers over the already
installed tubes and add the rubber O rings around the coolers to clamp them in place.
Hint: Add O rings before tube cooler is slid down fully.
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When installing the 6550C or KT88 power tubes, match the numbers designated on the
metal base of the tube or the tube boxes to the corresponding markings printed on the
tube top (V5 through V8 and LV5 through LV8) and be sure the center pin key locator is
in alignment with the slot in the center of the socket. Again push down the tube, rocking
gently until it is firmly seated.
Note the locating center key
and notch for proper
alignment of tube and socket.
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Bia sin g o f th e Po w e r Tu b e s
Bias voltage applied to the grids of the power tubes in the output stage should be
checked from time to time (once a month) to keep these tubes operating at the optimum
operating point. A properly biased power tube will have a longer, happier life.
To check the bias of the 6550C/ KT88 tubes, place the amplifier in mute with the power
on and the amplifier in operate mode (STANDBY LED Green; Power LED Red-for MUTE).
Looking at the tube top, take note of the power tube location and the bias LED below the
surface of the chassis next to each tube. Also note the printed line that leads to each
power tube. At the opposite end of this line is the bias adjustment for each power tube, a
small slotted metal shaft, again located below the chassis surface. See reference dia-
grams for further clarification.
If a bias LED is glowing red the tube is overbiased; if a bias LED is glowing green the
tube is underbiased, both conditions cause undue wear and/ or are not optimal for the
tube. The LED should not be glowing at all for the proper operating bias.
To properly bias the tubes is a simple procedure. For the power tubes on the left (LV5 to
LV8) insert the biasing driver into the slot head of the bias adjustment control and turn
the driver to adjust the control counterclockwise so the LED is green. Turn the adjustment
back clockwise until the LED begins to dim. At this point; through careful adjustment,
continue slowly turning the bias control, stopping the moment the LED goes out. No light
from the LED indicates a properly biased tube. Fo r th e m o st a ccu ra te b ia sin g , th e
b ia sing co ntrols sh ou ld a lw a y s b e ro ta te d from the LED e m ittin g g re e n
to th e LED em ittin g no lig ht, sto p p in g im m ed ia te ly, a s so on a s th e LED
e m its n o lig ht. Repeat procedure on the next tube until all tubes are properly biased.
For tubes on the right side of the amplifier (V5 to V8) the biasing controls are opposite.
Turn the biasing controls clockwise initially to decrease bias so the LED is green and
counterclockwise until the LED goes out. Refer to the Tube Top diagram for direction.
A cutaway of the tube
top showing the location of
the biasing controls below
the tube top surface
and the biasing driver.
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Co n tro ls, Fu n ctio n s a n d Co n n e ctio n s
Fro n t Pa n e l
Refer to Reference Diagrams.
C
D
Power Switch
This switch provides control over the AC power from your wall outlet. When OFF (out
position) nothing on the amplifier is functional. When ON (depressed) the amplifier will
operate normally (green power LED indicates ON; Red Power LED indicates ON but in
MUTE mode).
Standby Switch
This switch when OFF (out position) will allow normal operation of the amplifier (indicat-
ed by the green Standby LED, assuming Power ON). When depressed ON the amplifier
will be placed in STANDBY mode and will not be operational (indicated by the red
standby LED, assuming Power ON). In this mode, a small amount of current will remain
flowing through the tubes, this reduces power consumption and extends tube life during
periodic short term non-use periods (i.e. during a listening session when interruptions
occur, or a short time prior to a listening session so the amplifier is warm and ready).
This mode also will keep optimal warm up times of the tubes shorter. For periods
between listening sessions extending over a 12 hour period, it is recommended that the
Power 2 is turned off via the Power Switch.
E
F
Power LED
When this LED is off, so is the amplifier. When the LED is glowing red, both chnnels are
Muted, controlled by the Input Selector Switches (I). When the LED is green, the amplifier
is receiving power and both inputs are selected, the amplifier is ready for operation.
(Green Power LED indicates ON; Red Power LED indicates ON but in MUTE mode;
Green + Red (Orange) indicates one channel is in MUTE and one channel is selected).
Standby LED
When this LED is off, so is the amplifier. When the LED is glowing red, this indicates the
amplifier is in Standby mode, controlled by the Standby Switch. When the LED is green
the amplifier is in operate mode.
Re a r Pa n e l
Refer to Reference Diagrams.
G
Detachable Power
Cord Socket
Plug the detachable Power Cord into this socket. The Power 2 amplifier is configured
for the operating voltages in which they are sold. See shipping box or Voltage/
Impedance sticker on rear of the chassis for voltage settings. If a different operating
voltage is required, please contact an authorized Sonic Frontiers dealer or the factory
directly.
H
Fuse Location
rated between 110-120V or a 3.5 amp slo-blo fuse for countries operating on
a 220-240V supply.
REPLACEMEN T FUSES MUST BE RATED W ITH THE SAME SPECIFICATIO N S
AS THE O RIGIN AL FUSE.
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Damage due to bypassing the fuse or due to replacement of a fuse of higher ratings will
not be covered under the warranty. To access the fuse, insert the slotted screwdriver,
pushing to compress the internal spring and turn counterclockwise to unlock the housing.
The spring will then eject the fuse and the housing.
I
Left and Right Channel
Input Selector Switches
These switches must both be rotated to the desired position to select the desired input,
XLR Balanced, RCA Single-Ended Non-Inverting (+) or Inverting (-) for normal operation.
In the MUTE position, this control allows for BIASING CONTROL of the power tubes and
for safe cable swapping without shutting down the amplifier. When both switches are in
the MUTE position the front panel Power LED will turn RED. Note: This position is purpose-
ly positioned at 12 o’clock so it can be easily determined when access is obscured. The
fr ont panel Power LED will also turn red if this switch has selected an input which has no
connection. If any input selector switch is in MUTE and the other is not, the Power LED will
be a Red & Green colour at the same time.
J
Left and Right Channel
Balanced XLR Inputs
These inputs accept an XLR balanced connection from the preamp’s left and right
balanced outputs.Connections should be made left channel to left channel right channel
to right. Note: The XLR pin configurations are as follows:
Pin#1- Ground
Pin#2- Positive
Pin#3- Negative
View from front of connector.
K
L
Left and Right Channel
Single-Ended RCA
Inverting Inputs
These inputs accept an input signal from a single-ended output of a preamp or source
that is 180°out of phase relative to the original signal and correction for this configura-
tion is desired. The input on the Power 2 does invert the phase of the output signal, rela-
tive to the input signal. Connections should be made left channel to left channel right
channel to right.
Left and Right Channel
Single-Ended RCA
These inputs accept an input signal from a single-ended output of a preamp or source
that is in ....absolute phase or are used if it is desired to maintain the phase of the signal
from the preamp. Simply explained, this input does not invert the phase of the output sig-
nal relative to its input. Connections should be made left channel to left channel right
channel to right.
Non-Inverting Inputs
M
N
Left and Right Channel
Ground Posts
This post is offered for use when a ground connection is required (i.e. when amplifier’s
function is being tested by a technician). It has no use for day-to-day audio related
operation.
Left and Right Channel
These posts are used to connect the amplifiers to the speakers; positive terminal to posi-
Loudspeaker Binding Posts tive terminal, negative terminal to negative terminal, from the right posts to the right
speaker and left posts to the left speaker.
WARN IN G: AMPLIFIER O UTPUT IS BALAN CED.
CARE MUST BE TAKEN TO EN SURE THE AMPLIFIER IS N O T CO N N ECTED
TO LO UDSPEAKERS (CERTAIN SUBW O O FERS) O R LO UDSPEAKER SW ITCH-
BO XES THAT HAVE A CO MMO N GRO UN D. CO N SULT YO UR DEALER O R
SO N IC FRO N TIERS DIRECTLY FO R FURTHER CLARIFICATIO N REGARDIN G
CO N N ECTIO N S TO ITEMS IN THESE UN IQ UE CASES. DAMAGE TO THE
AMPLIFIER O R CO N N ECTED EQ UIPMEN T W ILL N O T BE CO VERED UN DER
WARRAN TY IF THESE W ARN IN GS ARE IGN O RED.
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Ad ju stm e n t fo r Lo a d Im p e d a n ce
N o te : Ad ju stm e n t fo r lo a d im p e d a n ce sh o u ld o n ly b e d o n e b y a n
a u th o rize d So n ic Fro n tie rs d e a le r, d istrib u to r o r se rvice te ch n icia n . An y
d a m a g e to th e a m p lifie r a s a re su lt o f a p e rso n (s) n o t a u th o rize d b y
So n ic Fro n tie rs w ill n o t b e co ve re d u n d e r w a rra n ty.
Wa rn in g : Da n g e ro u s vo lta g e s e x ist w ith in th is a m p lifie r.
The nominal speaker load of the amplifier was factory set to the impedance designated
on the Voltage/ Impedance sticker on the back of the chassis and shipping carton. In the
event that you should require different impedance operation, the amplifier can be set to
handle 2, 4 or 8 ohm loads. Some experimenting of this setting may be required for
speakers which vary considerable in impedance across a frequency range. To change
the output setting have your Sonic Frontiers’ dealer follow these steps:
1. Unplug all connections to the power amplifier, namely the AC power supply cord and
w a it a m in im u m o f 2 0 m in u te s fo r a ll p o w e r su p p lie s to d isch a rg e .
2. Place the amplifier on the rear handles so it is upright and the underside is exposed.
Using the Phillips screwdriver provided unscrew the bottom panel and remove.
The terminal block
After removing the
bottom cover, locate
the terminal block
for the right channel
in the right rear corner.
for the left channel
in the left rear corner.
3. Look for the terminal blocks under the transformer housings which looks like this:
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4.Using the slot screwdriver provided with the amp, deal with one connection at a time,
loosening off the tap screws of the first spade lug connection and tightening to the
desired tap. The final connections should resemble these renderings:
8 Ohm Impedance Connections
N o te th e so ld e r
co n n e ctio n s o n th e
te rm in a l b lo ck . Un d e r n o
circu m sta n ce s sh o u ld
th e se co n n e ctio n s b e
ta m p e re d w ith .
FRO N T O F
THE AMPLIFIER
4 Ohm Impedance Connections
FRO N T O F
THE AMPLIFIER
2 Ohm Impedance Connection
FRO N T O F
THE AMPLIFIER
5. Repeat for each channel.
6. Ensure all 12 screws per terminal block are tightened so there is no chance of them
vibrating loose.
7. Replace the bottom cover and all external connections.
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Ca re a n d Ma in te n a n ce
Pla ce m e n t
The amplifier must be placed on a hard flat surface with plenty of unobstructed space
around the Power 2 to allow for free movement of air for proper cooling. If the amplifier
is to be placed on a carpeted floor, a Wood, Ceramic, Concrete, Marble... tile or slab
18” x 22” (or larger) must be place under the Power 2 Amplifier.
If the amplifier is left unattended or is exposed near small children or pets, it is recom-
mended that the tube cover be used. Cooling of the tubes is not as effective with the
cover on, although it does allow for adequate operating temperatures.
To add the cover, simply place the cage over the tube top. The cover is locked through
the tightening of the large screw heads on the sides located between the tube top and
transformer case.
The location of the screw which
locks the tube cover in place.
To remove the cover, loosen screws that were indicated for fastening. The Power 2’s fas-
tening screw is spring loaded for release after it is loosened. Then while applying a small
amount of outward tension at the screw locations, lift the cover straight up and away
from the tubes.
If the tube cover is not used, it is recommended that the tubes, namely the 6550C/ KT88s
are protected from settling dust in NON-USE periods. Dust settling on the tubes can
cause heat impairment of the tubes. Therefore, when the amplifier is NOT IN USE, a
cloth or dust cover should be used.
Ho w d o I k n o w w h e n to re p la ce th e tu b e s?
If the tubes lack power to drive your speakers, are hard to bias or won’t hold bias, it
could be time for replacements. Power tubes generally wear faster then small signal
tubes, but how much faster depends on how often you run your system. If you need help
determining these factors or sourcing replacement tubes, contact your Sonic Frontiers
dealer, Sonic Frontiers or The Parts Connection (a division of Sonic Frontiers, 1-800-769-
0747 in the U.S. or Canada, (905) 829-5858 for elsewhere) for further assistance.
Cle a n in g
Sonic Frontiers recommends only a dry cloth be used to clean the Power 2 Amplifier.
Sonic Frontiers does not warranty damage done through liquids spilled on circuitry.
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Tro u b le sh o o tin g
If at any time the amplifier should fail to work, follow these steps:
1. Check that all tubes are fully seated in correct sockets and all tube filaments are lit.
2. Check all connections at the rear panel.
3. Check that the amplifier is not in MUTE mode.
4. Check that the proper input is selected via the Selector Switch.
5. Check that the amplifier is in POWER ON mode and NOT in STANDBY mode.
6. Check other equipment and connections to that equipment in your system, from speak-
ers to source.
7. Check that no fuses are blown in all equipment and/ or breaker switches in the home.
If this checklist fails to be fruitful, contact your dealer or Sonic Frontiers directly.
Se rvicin g
If the amplifier ever requires servicing in or outside of the warranty limitations, contact
your Sonic Frontiers dealer or Sonic Frontiers directly.
Bre a k -in Tim e
As with all audio electronic products, the ultimate sonic character of the Power 2 will not
be realized until and unless the unit receives a minimum of approximately 70 hours of
signal break-in time (i.e. the Power 2 is on and outputting a signal).
Sa fe ty In stru ctio n s
1. Water and Moisture - This product should not be used near water. To prevent fire or
shock hazard, do not expose this product to rain or moisture.
2. Heat - This product should be situated away from heat sources such as radiators, heat
registers, stoves, or other appliances which produce heat.
3. Power Sources - This product should be connected to an AC power source of the
proper rated voltage. The original shipping container will stipulate the AC voltage this
unit can operate with correctly.
4. Servicing - Do not open this product for any reason. No user serviceable parts inside.
Refer servicing to an authorized service technician.
5. Non-Use Periods - The power cord of this product should be unplugged from the out-
let when left unused for an extended period of time.
6. Do not remove the top or bottom covers while the unit is “on”, or connected to an AC
power source. Cover screws could fall through the ventilation slots and cause electrical
damage to the amplifier.
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Wa rra n ty
Discla im e r o f Lia b ility
Under no circumstances does Sonic Frontiers, Inc. assume liability or responsibility for
injury or damages sustained in the use or operation of this equipment or for damages to
any other equipment connected to it. Sonic Frontiers, Inc. reserves the right to make
design changes or improvements without the obligation to revise prior versions. All speci-
fications are subject to change without notice.
Lim ite d Five Ye a r W a rra n ty
Sonic Frontiers, Inc. warrants to the purchaser that each amplifier is free of manufactur-
ing defects for a period of five (5) years from the date of purchase. This five (5) year lim-
ited non-transferable warranty excludes all vacuum tubes, which we warrant for a period
of twelve (12) months. To receive this warranty, the original purchaser must complete and
mail to Sonic Frontiers, within thirty (30) days from the date of purchase, the enclosed
Warranty Registration Card. Sonic Frontiers, Inc. will then validate the warranty to the
original purchaser. This warranty is subject to the following conditions and limitations:
1. Warranty applies only to the original purchaser.
2. This warranty is void and inapplicable if the product has been handled other than in
accordance with the instructions in this Owner’s Manual, abused or misused, damaged
by accident or neglect or in being transported, or the defect is due to the product being
tampered with, m o d ifie d or re p a ire d by anyone other than Sonic Frontiers, Inc. or
an authorized Sonic Frontiers repair depot.
3. Warranty does not cover normal maintenance.
4. Sonic Frontiers, Inc. shall not be responsible in any way for consequential or indirect
damages or liabilities resulting from the use and operation of the product covered herein
or resulting from any breach of this warranty or any implied warranty relating to said
product.
During this period, Sonic Frontiers, Inc. will repair or replace any defective components
free of charge. A Re tu rn Au th o riza tio n N u m b e r (RA Number) is required before
any product is returned to our factory for any reason. This number must be visible on the
exterior of the shipping containers for Sonic Frontiers to accept the return.
Units shipped to us without a Return Authorization Number or without a visible RA
Number on the exterior of the shipping containers will be returned to the sender, freight
collect.
Units to be repaired by Sonic Frontiers, Inc. must be sent shipping and insurance pre-
paid by the original purchaser in the original packing material. A returned product
should be accompanied by a written description of the defect. Repaired units will be
returned by Sonic Frontiers, Inc. shipping and insurance prepaid.
All other warranties or conditions either written or implied are void.
Note: In foreign markets (anywhere outside of Canada and the USA), the warranty is sup-
plied by the authorized International Distributor. Exact terms and conditions may vary.
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Sp e cifica tio n s
Note: Power ratings based on a nominal power line input. All specifications are made
on the 8 ohm taps, utilizing an 8 ohm load unless otherwise specified.
Power Output:
110 watts continuous at 8, 4 and 2 ohms from 20 Hz to 20 kHz with less than 1% total
harmonic distortion terminated with rated load (typically <0.5% @ 110 watts 1 kHz) both
channels driven. Actual power output available at clipping (defined as <1% THD)
approximately 120 watts RMS
SMPTE Intermodulation
Distortion:
<1% 20 Hz to 20 kHz @ 110 watts output
Power Bandwidth:
(110 watt output)
15 Hz to 90 kHz (-0.5 dB points)
5 Hz to 110 kHz (-3 dB points)
Frequency Response:
5 Hz to 40 kHz @ 1 watt (-0.5 dB points)
2 Hz to 120 kHz @ 1 watt (-3 dB points)
Input Sensitivity
1.25V RMS balanced for 110 watts output
(for 110 watt output):
1.25V RMS single-ended (inverting or non-inverting)
Input Impedance:
200K ohms balanced
100K ohms single-ended (inverting or non-inverting)
Damping Factor:
>50 (determined using the IHF method from RS-490)
Output Impedance:
Negative Voltage Feedback:
Hum and Noise:
0.30 ohms at 1 kHz
16 dB
approximately 400 microvolts of wideband, unweighted noise @ the 8 ohm taps,
input muted; -110 dB below a 110 watt output
Rise Time:
3.0 microseconds
Slew Rate:
16 volts/ microsecond
Power Requirements:
110-120 VAC 60 Hz (220-240 VAC); 580VA at rated output, 650VA maximum
and 375VA with no signal input
Tube Complement:
8 (4 matched pair) x 6550C/ KT88 - power output; 6 x 6922 - input/ driver; 2 x 5687
- high voltage driver
Dimensions:
18” (46 cm) W x 22” (56 cm) D x 9” (23 cm ) H
110 lbs (50 kg) net each (unpacked)
Weight (approx.):
Sonic Frontiers continually strives to improve their products; specifications are
subject to change without notice.
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