Owner`s Reference
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
Instructions for Use
BHK Signature 250 and 300 Amplifiers™
4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 support@psaudio.com www.psaudio.com
©2015 PS Audio Inc. All rights reserved.
15-070-01-1
Rev A2
Introduction
Owner’s Reference BHK Signature Amplifiers
®
Important Safety
Instructions
Read these instructions
Heed all warnings
Follow all instructions
WARNING. TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE.
Clean only with a dry cloth.
Do not place flammable material on top of or beneath the component.
All PS Audio components require adequate ventilation at all times during operation. Rack
mounting is acceptable where appropriate.
Do not remove or bypass the ground pin on the end of the AC cord unless absolutely necessary
to reduce hum from ground loops of connected equipment. This may cause RFI (radio frequency
interference) to be induced into your playback setup. All PS products ship with a grounding type
plug. If the provided plug does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the apparatus. Unplug this apparatus during
lightning storms or when unused for long periods of time.
When making connections to this or any other component, make sure all components are off. Turn
off all systems’ power before connecting the PS Audio component to any other component. Make
sure all cable terminations are of the highest quality.
There are no user serviceable fuses inside this product.
THERE ARE NO USER-SERVICEABLE PARTS INSIDE ANY PS AUDIO PRODUCT. REFER ALL
SERVICING TO QUALIFIED SERVICE PERSONNEL
Please contact your authorized dealer, distributor, or PS Audio if you have any questions not
addressed in this reference manual.
PS Audio® is a registered trademark of PS Audio Inc., and is restricted for use by PS Audio, Inc., its
subsidiaries, and authorized agents.
Introduction
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
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©2015 PS Audio Inc. All rights reserved.
ii
Specifications
®
Owner’s Reference BHK Signature Amplifiers
BHK Signature 250 Stereo and BHK Signature 300 Mono
Unit Weight83 lbs
Unit Dimensions
17.1” x 8.7” x 14” Chassis only. 15" deep including connectors.
Shipping Weight92 lbs
Shipping Dimensions
21”x 13” x 19”
Color OptionsBlack, Silver
Voltage Options
Factory set only
Japan 100V
North America 120V
Europe/Asia/Australia/New Zealand 230V
Mains Power Inputs
IEC C14
Fuse Complement all Countries
4 - 10 amp fast blow 5x20mm Rail Fuses
Fuse Complement Mains
100vac Countries
1 - 2 amp slow blow H-rated 5x20mm
1 - 12 amp slow blow H-rated 5x20mm
120vac Countries
1 - 2 amp slow blow H-rated 5x20mm
1 - 10 amp slow blow H-rated 5x20mm
230vac Countries
1 - 1.6 amp slow blow H-rated 5x20mm
1 - 5 amp slow blow H-rated 5x20mm
Accessories Included
US (NEMA 5-15P) (all versions)
Schuko (CEE7/7) (230V version)
UK (BS 1363) (230V version)
Audio InputsRCA (Unbalanced)
XLR (Balanced)
Speaker Outputs Signature 250
Gold plated copper binding posts (2 pair per channel)
Speaker Outputs Signature 300
Gold plated copper binding posts (2 pair)
Other
DC Trigger Input 3.5mm 5-15VDC
Warranty
3 years parts and labor on unit
1 year on vacuum tubes
Performance - Signature 250 (All Measurements with Both Channels Driven)
Output Power (120VAC Mains, 1KHz, 1% THD)
8Ω 250Wminimum
4Ω
500W minimum (short term)
4Ω
200W (long term per IEC60065)
Gain30.5dB +/-0.5dB
Sensitivity1.3V
Input ImpedanceUnbalanced
100KΩ
Balanced200KΩ
Output Impedance 50Hz, 2.8VRMS
<0.1Ω
Frequency response
@2.8VRMS
10Hz – 20KHz +/- 0.1dB
10Hz – 125KHz +0.1/-3.0dB
Specifications
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 service@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
iii
Specifications
®
Owner’s Reference BHK Signature Amplifiers
THD1KHz, 1W/8Ω
20-20KHz, 1W/8Ω
1KHz, 200W/8Ω
1KHz, 400W/4Ω
< 0.01%
< 0.1%
< 0.1% (120VAC Mains input)
< 0.1% (120VAC Mains input)
Noise100-20KHz<-85dBV
Power ConsumptionReady 75W
Idle175W
Rated power 8Ω850W
Rated power 4Ω1600W
Performance - Signature 300
Output Power (120VAC Mains, 1KHz, 1% THD)
8Ω
300Wminimum
4Ω
600W minimum
2Ω
1000W minimum (short term)
2Ω
750W (long term per IEC60065)
Gain30.5dB +/-0.5dB
Sensitivity1.5V
Input ImpedanceUnbalanced
50KΩ
Balanced100KΩ
Output Impedance 50Hz, 2.8VRMS
<0.1Ω
Frequency response
@2.8VRMS
10Hz – 20KHz +/- 0.1dB
10Hz – 125KHz +0.1/-3.0dB
THD1KHz, 1W/8Ω
20-20KHz, 1W/8Ω
1KHz, 200W/8Ω
1KHz, 400W/4Ω
< 0.02%
< 0.1%
< 0.1% (120VAC Mains input)
< 0.1% (120VAC Mains input)
Noise100-20KHz<-85dBV
Power ConsumptionReady 75W
Idle175W
Rated power 8Ω600W
Rated power 4Ω1000W
Specifications
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 service@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
iv
Introduction
Owner’s Reference BHK Signature Amplifiers
®
Thank You
Thank you for your purchase of the PS Audio® BHK Signature Amplifier.
Designed by master engineer and audiophile, Bascom H. King, the BHK Signature Series of amplifiers
represents one man’s decades long pursuit of perfection. Nothing was spared, no shortcuts were
taken.
Zero Loss
Power amplifiers are the make-or-break component in a music reproduction chain. Everything in your
system funnels into this critical component and anything lost can never be recovered. To solve this
problem, the BHK Signature was designed as a hybrid amplifier featuring a zero-loss vacuum tube
input stage coupled to a high bias differentially balanced MOSFET output.
Two Models
There are two dedicated models in the Signature Series, the 250 stereo and the 300 monoblock.
Each model is housed in the same chassis with the identical circuit components; the stereo has two
channels, the mono one. In the stereo 250 one input tube is used for each of the two channels, in the
mono 300 both tubes are used in parallel to lower noise and double current. The same methodology
of parallel connection is employed in the MOSFET output stage as well.
Connectors
Output speaker connectors are custom machined out of copper, then gold plated. There are two pair
per channel on the stereo 250, and two pair on the mono 300. Each of the connectors was engineered
specifically to benefit the performance qualities of the BHK Signature.
Vacuum Tubes
The unit is shipped with a pair of hand matched Gold Lion 6922 vacuum tubes, installed in their proper
sockets and ready for use. If you wish to experiment with different tubes, you may use most 6 or 7
Series triode without changing the bias, which is adjusted automatically. Tube rolling, as it is known,
is common practice and an entirely different sound quality can be achieved by changing tube types.
Fuses
Power Cords
Break In
There are 6 fuses on the BHK Signature. 4 of the fuses are for the high voltage power supply rails.
The remaining two are AC input fuses, one each for the two power transformers. The smaller AC input
fuse passes power to the separate vacuum tube power supply, the larger fuse for the massive power
output stage transformer. It is possible to replace the supplied fuses with high-end versions, but we
recommend care be taken to use H-Rated fuses, specifically tailored for high current, high transient
in-rush conditions.
Power cords matter. We recommend using a high-end power cord to replace the courtesy stock
power cord supplied with the BHK Signature.
Break in matters. The BHK Signature should sound quite good out of the box, but far better with a
hundred or so hours of on-time. It is not necessary during the on-time to play music. Simply leaving
the amplifier in the ready position will help the MOSFET power section improve its performance over
time. The tubes also need break in, but that time should be limited to 24 hours of constant on-time to
preserve their life.
Introduction
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
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©2015 PS Audio Inc. All rights reserved.
v
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
Location
Once your BHK is unpacked, you’ll need to find a convenient place to set it. We recommend
floor mounting on a platform or shelf mounting as close to the speakers as possible. If the source
equipment (preamp or DAC) is far away from the BHK, it is recommended to use balanced
interconnects if possible.
Power Cables
Once you have chosen the location for the BHK you can use the supplied AC power courtesy cord
to connect it to the AC power or you can use an aftermarket power cord. Power cords make a
difference and we do not recommend using the supplied power cord for critical listening or long term
use. We strongly recommend the use of a PS Audio PerfectWave® Power AC cable or any excellent
aftermarket power cable for best results as it is always preferable to feed your equipment with the
best power cables possible. Choosing an excellent power cable will make a significant performance
improvement over the stock power cable.
Conditioners
The BHK should be fed from a P10 Power Plant® to improve its effectiveness. Use of other power
conditioners with the amplifier is fine as long as you make sure the unit benefits from their use. We
do not recommend using a passive line conditioner as most tend to rob the BHK of its rich sound
qualities.
Country Specific
AC Voltages
The BHK, as with all PS Audio products, is country specific to its incoming AC voltage. This means
the units can only be operated at its preset voltages, such as 230 for most of Europe and Asia, 100
volts for Japan and 120 for the US and other similar countries.
Immediate damage can occur if you try and power the BHK on a voltage it was not designed to
operate on.
Cables Matter
Connecting cables matter. Carefully choose your speaker cables and connecting cables to the
equipment. Our preference for input cables is balanced, XLR type, but well built single ended RCA
cables are fine as well. Speaker cables can make or break the performance of an amplifier and great
care should be taken in using only the best match for your loudspeakers and BHK amplifier.
Burn-in
Burn-in is important. The BHK Signature has been tested, burned in for 24 hours, then fully tested
again before shipping to you. Additional extended on-time for the unit is important and its sound will
change over time in a process known as burn-in. We recommend turning the unit on for at least 24
hours before critical listening begins. Many users report 100 to 200 hours of runtime is needed for
best performance. We find that several days of runtime is sufficient to enjoy the majority of audio
benefits.
Standby
We recommend leaving the rear panel power switch active at all times, but placing the unit in its
standby mode when listening has been finished. Standby can be activated by pressing the front
panel PS Audio logo button, located on the upper left hand corner of the BHK Signature front panel.
When the logo standby button is not lit, the amplifier is in standby mode, and the vacuum tubes are
turned off. Standby mode keeps the solid state circuitry of the amplifier in a reduced power mode,
maintaining excellent performance benefits while consuming little power.
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
1
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
Tubes are shipped
already installed
The BHK Signature ships with a hand matched pair of vacuum tubes pre-installed in the unit. There is
no need to install tubes, simply set the amplifier up and you are ready to play it.
Tube rolling
There are many who will wish to experiment with different tubes on the BHK input in a practice known
as tube rolling. The BHK will accept and work with most 6 or 7 series dual triode tubes. Different
tubes require different bias currents, but the BHK will automatically adjust the current to exactly what
is needed.
How to change
tubes
To replace tubes in the BHK, follow these steps:
•
•
•
•
Turn off the main AC power either by unplugging the power cord from the AC source or turning off
the main power switch on the rear panel.
Remove the rear tube cover by loosening the two screws and remove the tubes currently installed.
Wait for LED to go out.
Place the tubes in the sockets making certain the orientation of the pins is correct. There is an
obvious break in the circular array of pins that matches the socket they are going into. Refer to
the pictures below.
Remove the
tube cover
using Phillips
screwdriver
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
2
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
Find the area
without pins
Match the tube
to the socket
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
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3
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
Place the other
tube in the socket
Tube life
Tubes have limited life spans. With normal use of a few hours a day they can go for many years without
replacement. The sonic characteristics of tubes will change over time. At first, many hours are needed
to sound best as they break in. As time goes on they will perform beautifully and reach their peak
performance. But with extended use, typically a year or two of service, their performance decreases
slightly and the BHK will not sound as it did. This indicates it is time to change the tubes.
Under normal usage we recommend changing the tubes every one to two years. Replacement
matched pairs are available from PS Audio as well as numerous tube retailers.
Keep a spare set
It probably makes sense to stock a fresh pair of tubes just in case. While not likely to fail or need to be
replaced often, tubes are the single most vulnerable parts in the BHK Signature Amplifier.
12 volt trigger
For those users wishing to remotely turn on and off the BHK, we provide a trigger input. This input
accepts from 5 to 12 volts. When a positive voltage within limits is applied, the amplifier will come out
of standby and turn on. Removing the voltage puts the BHK in standby mode.
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
4
Owner’s Reference
®
Connect the
speaker cables
Owner’s Reference BHK Signature Amplifiers
With the amplifier firmly seated where you have selected, it is time to connect the speaker cables. The
BHK Signature uses custom machined connectors. These connectors were specially engineered to
match the performance specifications of the BHK. Each connector is hewn from a solid block of high
purity copper, and machined on a lathe, then hand polished and gold plated.
The connectors can accept spade, banana or wire connections. There are two sets for each channel
on the Signature 250 and, two sets for the single mono channel on the Signature 300. Most systems
will use only one set of the binding posts to connect the speaker cable. Use only the finest speaker
cables and connectors.
Biwire
Some may wish to biwire their speakers to the BHK. This practice involves using one shotgun
configured cable or two separate cables. In either case, connect one cable to one set of binding posts,
the other to the second set. On the loudspeaker side, one pair of cables goes to the tweeter binding
posts, the remaining set to the woofer section.
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
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©2015 PS Audio Inc. All rights reserved.
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Owner’s Reference
®
Plug in the
connecting cables
Owner’s Reference BHK Signature Amplifiers
The BHK Signature Amplifier accepts either single ended RCA or balanced XLR connections
to the preamplifier or DAC feeding it. Regardless of the cable chosen, the BHK will treat the
incoming signal in such a way that it becomes balanced throughout the amplifier’s circuitry.
Our preference for connection to the preamplifier is balanced XLR cables. Balanced signals are
lower in noise, provide an extra 6dB of level and take advantage of common mode rejection.
Single ended RCA cables can also be good, but we shy away from their use at lengths
exceeding two meters.
Once connections have been made to both the loudspeakers and the preamplifier, it is time to
plug the AC power source in.
Plug in the
power cable
BHK amplifiers are voltage specific. They operate ONLY at the voltage set at the factory. Do NOT
plug the BHK into a voltage other than what it is set for. Failure to observe this rule may damage
the BHK.
Plug a high quality power cable into the BHK IEC AC inlet, the other end into either a P10 Power
Plant, power conditioner, or wall socket of appropriate voltage. Then turn on the master AC
switch.
Turn on the master
power switch
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
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©2015 PS Audio Inc. All rights reserved.
6
Owner’s Reference
®
Owner’s Reference BHK Signature Amplifiers
You are now ready to enjoy your first listen to the BHK Signature Amplifier. Making sure the
preamplifier and the system is on, push the front panel standby button on the BHK front panel. The
light will blink for 30 seconds as the tubes warm up. When the blinking stops and the PS logo turns
steady on, the amplifier is ready to play music.
Leave It On
Once the amp is on for the first time, we recommend leaving it on for 24 hours, then placing it in
standby whenever you are finished listening. Placing the amplifier in standby through the front panel
standby button helps preserve tube life, yet keeps the BHK warmed and ready to go.
Standby
Placing the BHK in standby mode reduces the idle current and the MOSFET circuitry will stay active
at a reduced heat. In standby it is permissible to change inputs and output connections as no
signal may pass. It is not recommended to change tubes while in the standby mode. If you wish
to change tubes, please remove all AC power from the unit and wait at least thirty minutes once
power has been removed before changing tubes.
Logo Light Fault
Mode
If the front panel logo light begins blinking and no sound comes from the amplifier it means the
BHK has gone into fault mode. This can happen for a number of reasons including: protection from
low impedance, short circuit protection on the speaker terminals, exceeding the amplifier’s wattage
rating, excessive heat, or DC present on the outputs.
Typically you can just press the logo button and the amplifier will return to normal operation. If the
amplifier tries to turn on and returns to protection mode, check all of the aforementioned causes
and correct the problem before trying again. If nothing seems wrong, remove both inputs and
outputs and try again. If that still does not release the unit from protection mode, remove all power
from the amplifier and check the fuses. In the unlikely event none of these remedies work, call your
dealer, or PS Audio, for help.
Owner’s Reference
4826 Sterling Drive, Boulder, CO 80301 15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
7
Questions And Answers
®
Owner’s Reference BHK Signature Amplifiers
Should the unit be
on all the time?
We recommend leaving the rear panel master power switch on at all times. We further recommend
placing the BHK in standby mode when the listening session is over. Standby mode is accessed
through the front panel PS Audio logo button.
Fuses?
There are multiple fuses in the BHK accessible through the back panel. Please see instructions earlier
in this manual for additional information about changing or replacing them.
Placement?
Placement of the BHK is important for proper cooling and best audio practices. Make certain wherever
you place the BHK there is adequate ventilation space above and below the side heat sinks. Best
audio practices recommend the amplifier be placed as close to the loudspeakers as practical.
Break in?
All equipment benefit from a period of on-time known as break in. We recommend an initial 24 hours
of on time. It is not necessary to play music through the BHK to achieve proper break in, only that
the amp is on and drawing power from the wall. The first break in period of 24 hours should be out of
standby mode and fully on. We recommend this first 24 hours initial break in period then keeping the
amplifier plugged in and the master power switch on, but the amp in standby mode.
The logo light
blinks at first
When the BHK comes out of standby mode through pushing the front panel logo light, that light will
blink for 30 seconds. This is normal, and shows the tubes are warming up and stabalizing before
music playback.
The logo light
blinks and the
amp does not
play
This indicates a fault mode has been reached. The logo light will continue to blink until reset with a
push. Typically this happens when the music played is too loud or the impedance of the loudspeaker
dipped too low. We advise resetting and playing a little softer. If the blinking does not reset, refer to the
earlier pages in this manual for help.
Do connecting
cables matter?
Connecting cables matter greatly. They are the ins and outs of your amplifier and can have a dramatic
impact on the musical performance of the BHK amplifier. Great care in matching cables and their
characteristics should be taken when playing the BHK.
What about
power
conditioners?
Most power conditioners restrict the power and increase impedance going into the BHK and should
be avoided. Some, like the PS Audio P10 AC regenerator do the opposite by lowering impedance
and unleashing more power than available from the wall. Others are parallel designs and can be
used without degradation, sometimes to great benefit. Do not assume they will better the amplifier’s
performance. As always, use your ears as guides. If it doesn’t sound better, it’s best to avoid them.
Can I bridge
the BHK?
Bridging an amplifier uses the left and right channels to create a single more powerful version. The
BHK does not permit bridging and damage to the amplifier’s output circuitry may occur if you attempt
this.
Questions and Answers
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
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©2015 PS Audio Inc. All rights reserved.
Troubleshooting
®
Owner’s Reference BHK Signature Amplifiers
BHK won’t play
music
Check to make sure power is going into the BHK and it is connected to a live source. Make sure the
rear panel master power switch is in the on position and the lights near the tubes are lit. Push the
front panel logo light and it should blink, then remain lit after 30 seconds. If it is lit, look to the rear of
the unit and see if the tubes are lit and glowing. If there still is no sound, check the preamplifier and its
connections to the BHK. Check the speaker cable connections to the speakers.
Check the logo
If the front panel logo light continues blinking after the first 30 seconds, there is a fault condition. Push
the button again to reset. Check the fault conditions listed earlier in this manual.
If you have hum
If there is hum coming from your loudspeakers it may be coming from your preamplifier, or it may
come from an interaction between components in your system and the BHK. This type of interaction
is known as a ground loop.
Ground loops
The first step to deteremine where the hum is coming from is to place the BHK in standby and remove
the input connection from the preamplifier. Turn the amp back on and see if there is hum. Chances
are good there will not be. If the hum is a low frequency soft sound, see if its level goes up and down
with the preamp volume control. If it does, the problem is in the preamplifier. If not, it may be in your
connecting cables. Try a different set. If the hum is a sharper buzz it is most likely a ground loop.
The easiest way to figure out where ground loop problems lie is by the process of elimination. You
need to determine where the hum or buzz is coming from within your system.
If the hum/buzz goes away when you remove the inputs to the power amp, your next step will be to
reconnect the amp and move further down the chain. It is important to do this in the correct order and
take the time to perform the test in a methodical step-by-step manner.
If you have a preamp, or processor that is feeding the power amp, your next step would be to
disconnect all inputs to the preamplifier or processor. Once these are disconnected, and the preamp
or processor is connected only to the power amplifier, turn the system on and again, listen for hum.
Should the hum now appear, it is a problem with your preamp or processor or their interaction with
the power amp. Before returning the preamp or processor to the manufacturer, try a cheater plug to
break a ground loop. Cheater plugs are simple devices that convert a three prong AC plug into a two
prong AC plug and in the act of converting three prongs, to two prongs, they disconnect the ground
from the wall socket. Try one of these on the preamp, or the power amp, or both.
If you determine that there is still no hum present when the preamp, processor or receiver is connected
with no inputs, then selectively begin plugging in your various inputs one at a time. After each
connection, check for hum until you discover the humming culprit. Use the same method described
above to remove the ground on the offending piece of kit.
VCR’s, surround processors, and any device that is connected to a television cable or satellite dish
can cause a loud buzz and should always be suspect. If, by the process of elimination described
Troubleshooting
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15-070-01-1
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9
Troubleshooting
®
Owner’s Reference BHK Signature Amplifiers
above, you determine it is a component like a cable TV box that is causing the hum/buzz to occur, and
using a cheater plug doesn’t help matters, it may be necessary to isolate the cable connection (CATV)
with an isolation transformer. This inexpensive device is available at most Wal Mart, Radio Shack or
department store type outlets and is sometimes called a ‘matching transformer’. If you have problems
finding one, call your local cable TV company for advice. The matching transformer will be placed
between the cable TV cord and the cable box, TV or processor.
It may be
something
unrelated causing
the hum
Just remember, take the system down to its simplest level of connection. Find a way to hook the
system up with as many pieces of the system not connected as possible. Keep it simple and get it
to the point where the hum’s gone. Then start adding back components one at a time until the hum
returns.
Finding the problem is 9/10th of the work in finding a solution.
The system
has no bass
It may be that you have the polarity of the amplifier loudspeaker connection wrong on one channel.
When out of phase, polarity, will cause bass cancellation and should be avoided. Check to make sure
the red terminal on the BHK goes to the red terminal on your loudspeaker.
Troubleshooting
4826 Sterling Drive, Boulder, CO 80301
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PH: 720.406.8946 support@psaudio.com www.psaudio.com
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10
Warranty
®
Owner’s Reference BHK Signature Amplifiers
Limited Three Year Warranty
Should I Register My Product?
•
•
•
•
•
Registering your product validates the warranty start date.
If you do not register your product within 30 days of service, a copy of your purchase receipt from an authorized PS
Audio dealer may be used as a proof of purchase to establish the warranty start date.
If no proof of purchase from an authorized PS Audio dealer or registration is provided, the production date of the
product will be used to determine the warranty start date.
Registration can be completed online, by phone, by mail, or by email.
You may wish to sign up for PS Audio’s monthly newsletters, specials, product updates, and/or Paul’s Daily Posts.
What Does this Warranty Cover?
This warranty covers defects in material and workmanship for products purchased from PS Audio or its authorized dealers
and agents.
What Will PS Audio Do to Correct the Problem?
In the event your product fails your sole remedy under this limited warranty shall be to return the product to PS Audio or an
authorized PS Audio repair center. The product will be repaired without charge for parts or labor, replaced, or the purchase
price refunded through the original point of purchase, at the option of PS Audio.
What is the Period of Coverage?
This limited warranty is in effect for 3 years on the amplifier and 1 year on the tubes, starting on the date the unit was first
purchased from PS Audio or its dealers and agents.
Who Pays for Shipping?
You are responsible to pay for the safe and proper shipment of the warrantied product to PS Audio or its authorized repair
center.
PS Audio or it’s authorized repair center will pay the cost of returning the repaired or replacement product to you under this
warranty.
What Does this Warranty Not Cover?
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This warranty does not cover damage due to:Accidents, carelessness, improper transportation, misuse, neglect, or
abuse
Failure to follow the operating instructions that are provided by PS Audio in the owner’s manuals (available for
download at psaudio.com)
Use in any manner inconsistent with PS Audio’s operating instructions (available for download at psaudio.com)
Lack of routine maintenance
Connection to an improper voltage supply
Alterations or modifications to the unit
Warranty
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
11
Warranty
®
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Owner’s Reference BHK Signature Amplifiers
Improper or unauthorized repair, including repairs not authorized by PS Audio or a PS Audio authorized repair
center
Fire, lightning, flood, “acts of God,” or other contingencies beyond the control of PS Audio
Products purchased through an unauthorized source (if you have questions as to whether or not a dealer is
authorized, please contact customer support at psaudio.com)
Products with a factory-applied serial number that has in any way been altered, defaced, or removed
Limitations on PS Audio’s Obligations Under this Warranty
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In no event will PS Audio’s liability to you exceed the original purchase price of the unit.
This warranty does not cover the cost of custom installation, customer instruction, setup adjustments, or signal
reception problems.
This warranty does not cover consequential and incidental damages. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
In the event your warrantied product cannot be repaired, PS Audio will replace or refund the unit. We reserve
the right to replace any out-of-stock, discontinued, or limited edition products with a comparable product.
Discontinued products may not be available for warranty replacement.
How Can the Warranty be Transferred?
This warranty is for the benefit of the original purchaser of the product. The warranty may be transferred to a subsequent
purchaser during the 3 year warranty period. To do this, you must contact PS Audio directly to set up transfer of
registration.
How Do I Get Warranty Service?
To locate an authorized PS Audio repair center, for service assistance, or for help with the operation of a product or just
for information, please contact PS Audio customer support.
Warranty Service Within the US
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You must first obtain a Return Merchandise Authorization Number (RMA#) to receive warranty service and prior to
returning any item. Contact PS Audio or an authorized PS Audio repair center to receive an RMA#.
You must put the RMA# on all returns. If it is not clearly marked, PS Audio will return the package back to you,
freight collect.
You should include a description of the problem, along with the RMA# inside the packaging.
Original packaging should be used for the safe transit of your PS Audio unit to the repair center. If you do not
have the original packing, PS Audio can sell and ship to you replacement packaging.
You are responsible for the cost of shipping the product to a PS Audio authorized repair center. You should insure
the product for its full retail cost in the event it gets lost or damaged in transit. PS Audio is not responsible for
damage incurred in products sent to us.
Shipping your product in non-PS Audio packaging may void this warranty. PS Audio reserves the right to charge
you for new factory packaging to return your product after a repair.
Warranty
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
12
Warranty
®
Owner’s Reference BHK Signature Amplifiers
How State Law Applies
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Warranty Service Outside of the US
PS Audio has authorized distribution in many countries of the world. In each country, the authorized importing
distributor has accepted the responsibility for warranty of products sold by that distributor. Warranty service should
be obtained where the product was purchased.
Changes to Our Products
PS Audio reserves the right to modify the design of any product without obligation to purchasers of previously
manufactured products and to change the prices or specifications of any products without notice or obligation to
any person.
PS Audio Inc.
4826 Sterling Dr.
Boulder, CO 80301
Phone - 720.406.8946
Fax - 720.406.8967
Email - support@psaudio.com
Web - psaudio.com
Warranty
4826 Sterling Drive, Boulder, CO 80301
15-070-01-1
PH: 720.406.8946 support@psaudio.com www.psaudio.com
Rev A2
©2015 PS Audio Inc. All rights reserved.
13
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