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Sherbourn
Te c h n o l o g i e s , I n c .
Owner’s Manual
for
Model LDS12/900
Distribution Amplifier
All of us at Sherbourn Technologies thank you for your decision
to purchase one of our amplifiers. We take enormous pride in the
design and manufacturing quality of our products and are confident that your new LDS12/900 will provide you with many years
of enjoyable and trouble-free service. Should you ever have any
need to call upon our services, please feel free to contact us at the
address shown at the end of this manual or you can contact the
dealership from which you purchased the product.
Sherbourn makes a complete line of amplifiers and a 7.1 Preamp/
Processor/Tuner for all kinds of listening pleasure. Whether your
taste is for two channel stereo, multi channel home theater or multi
channel whole house custom installation, there is a Sherbourn product that will be a perfect fit for your needs.
Once again we thank you for your decision to purchase one of our
fine products.
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Safety Instructions
1. Important Safety Instructions! Please read all
the safety and operating instructions shown in this
manual before operating this equipment.
2. The lightening flash within an equilateral triangle
shown above is intended to alert you to the presence of uninsulated ‘dangerous voltage’ within the
product’s enclosure that may be of sufficient magnitude to constitute an electric shock.
3. The exclamation point within an equilateral triangle shown above is intended to alert you to the
presence of important operating and maintenance
(servicing) instructions in the literature accompanying this appliance.
4. Please retain this manual in a safe place for future reference about safety and operating matters.
5. Adhere to all warnings and follow all operating
instructions.
6. Warning: To reduce the risk of fire or electrical
shock, do not expose this equipment to rain or
moisture.
There are no user serviceable parts inside. Refer
servicing to qualified personnel.
7. Caution: To prevent electrical shock do not use
this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be
fully inserted to prevent blade exposure.
8. For added protection for this product during a
lightening storm or when it is left unattended and
unused for long periods of time, it is recommended
that you unplug the unit from the wall outlet. This
will prevent damage to the product due to lightening or power line surges.
9. Do not use attachments not recommended in this
owner’s manual as they may cause hazards.
10. Locate the equipment for proper ventilation.
For example, the product should never be allowed
to operate while positioned on a bed, rug, sofa or
any such surface where proper ventilation is not possible. Nor should the unit be placed in a built-in
installation such as a cabinet or armoire, etc. in such
a way as to impede the air flow . Always ensure adequate ventilation openings - please see later comments regarding such an installation.
11. Locate the product away from heat sources such
as stoves, heat registers, radiators or other appliances
including other amplifiers that produce heat.
12. Mount the equipment in a wall or cabinet only
as described in this owner’s manual.
13. Do not use the equipment near water; for example near a bathtub, washbowl, kitchen sink, a
swimming pool, a wet basement, etc.
14. Do not place the product on an unstable cart,
stand tripod, bracket or table. The equipment is
heavy and should it fall, it could cause serious injury to a person and/or serious damage to the equipment.
Caution For Installation
1. Your Sherbourn amplifier can be placed on any
table or shelf. It can also be custom installed in a
rack, and/or in a piece of cabinetry or furniture of
your choice. It is however, important that if the amplifier is going to be housed in an enclosed environment, that you allow for adequate ventilation. Despite the adequately sized heatsinks built into the
amplifier, it is still important that good ventilation
be provided. Do not install the amplifier directly
above another heat generating component such as
another amplifier without adequate ventilation.
2. If your amplifier is going to be placed in an enclosed space such as an armoire, it is essential that
adequate ventilation be provided. W e strongly suggest that the shelf on which the product is being
placed includes a cutout of at least twenty inches by
twelve inches (50 cm by 30 cm) directly under the
ventilation slots on the bottom of the amplifier. A
similarly sized cutout should be made in the upper
or rear wall behind the shelf so that free air can flow
from beneath the unit to the outside atmosphere. Also
allow a minimum of three inches (7.5 cm) free space
above the product and two inches (5 cm) on either
side of the product. This combination of space will
allow for a free flow of circulating air to help keep
the amplifier from overheating. If your cabinet includes a number of products, it may be advisable to
install a quiet fan to assist the cooling process.
3. The dealership from which you purchased the
product is an expert on custom installation procedures and can provide invaluable advice to help you
make an aesthetically pleasing and trouble free installation.
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Caution For Connections
1. Connect this equipment only to the type of AC
power source as marked on the unit. Always route
AC power cords so they are not likely to be walked
on, or tripped over, or where they may be pinched
by items placed on or against them. Always pay
particular attention to cords at plugs and/or convenience receptacles, and at the point where they exit
from the product.
2. Do not defeat the inherent design features of the
polarized plug. Non polarized line cord adapters
will defeat the safety provided by the polarized AC
plug. If the plug should fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding-type plug.
If you use this product in a country which only has
two slotted receptacles in the house, you must use a
three-pin adapter plug to earth ground which is the
“E” (earth pin) of the power cord connected to this
product.
Care of the Product
Clean the product by dusting with a dry cloth. Do
not permit objects of any kind to be pushed and/or
fall into the product through the enclosure openings.
Front Panel Description
The front panel houses the main Power ON/OFF
switch. A blue LED will illuminate when the
LDS12/900 is ON and will remain illuminated regardless of the ‘Standby’ mode of any of the six individual stereo amplifiers; the LED will only extinguish once the Power ON/OFF switch is in the OFF
position or when the LDS12/900 is disconnected
from its electrical outlet.
Rear Panel Connections
The LDS12/900 has been designed to provide multiple stereo zones with identical performance and
features. The following descriptions apply to all
zones.
3. Do not overload wall outlets, extension or integral convenience receptacles, as this could result in
a risk of fire or shock.
Operating Voltage
The LDS12/900 amplifier is factory-set for 110V,
120V or 230V AC operation at either 50 or 60 Hz,
according to the country for which the unit was
manufactured (230V in European Union countries,
in compliance with CE regulations). The operating
voltage cannot be changed by the user and any attempt to do so will void the warranty .
The connections of the audio signal between your
preamp/control center and your LDS12/900 will be
made discretely via cables from the outputs of your
preamp to the gold plated inputs of your LDS12/
900. Please ensure that the cables are installed for
each channel as described on the following pages.
Volume Controls
T wo separate controls are provided for left and right
volume control. When functioning under the bridgemono mode, only the right volume control is used
for volume adjustment.
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Important note for using the
LDS Switches
For every first installation of a Sherbourn LDS
12/900 amplifier, do not set the LDS switches to
the OFF position until both switches are used to
sequentially check through each speaker connection, or the amplifier will not output the signal.
Operating the LDS switches
After physically installing a LDS12/900 amplifier
in a location according to the safety instructions
on page two of this manual, carefully complete the
signal cable wiring and speaker lead connections.
Refer to the drawings on pages 5 to 9 of this manual
to set the rear panel switches to your desired operating configuration.
Check and make sure both LDS switches are set to
the full clockwise position (ie., at position 3-R for
the left switch under group A amplifiers, and at
position 6-R for the right switch under group B
amplifiers. Connect the power cord and turn on the
power switch. The front panel blue light will come
on and both LDS LEDs under group A and B amplifiers will show the status of the speaker connections at the speaker output terminal of Zone 3-R
channel and at Zone 6-R channel. If the LED is
green it indicates a good speaker connection has
been made; orange indicates an open connection
somewhere; and red indicates either a short circuit
connection or a load impedance that is too low for
the amplifier.
Start with the LDS switch under group B amplifiers, then repeat the same process in this paragraph
for group A amplifiers. Sequentially rotate the LDS
switch to check through the positions 6-R, 6-L, 5R, 5-L, 4-R, and 4-L for group B amplifiers, then
3-R, 3-L, 2-R, 2-L, 1-R and 1-L for group A amplifiers. Observe the LED color above the switch when
checking each position. If a red or orange color is
detected, check and rewire the connection of that
channel until the LED turns green.
You must never turn the LDS switch to the OFF
position whenever a LDS LED is RED during
above checking. To do so may connect a deadshort to the amplifier which may cause damage.
Activating the LDS12/900
After checking through every speaker connection
with the LDS switches, and having confirmed the
LDS LEDs are all green, then remove the tiny locking screw between the OFF and 4-L positions for
group B amplifiers (and between OFF and 1-L po-
sitions for group A amplifiers). Turn the switches to
the “OFF” position which will fully activate the
LDS12/900. The power on/standby control is then
handed over to either the external 12V DC Trigger,
or the Music Trigger, or the always power ON position (but controlled by the front panel power switch)
depending on how the trigger mode setting is made.
Make sure to r e-install the locking scr ew so the LDS
switches can not be turned which would disable the
power on setting of the switch.
Input Selection Switches
The 12-channel amplifiers of the LDS12/900 are split
into two groups, A and B, with zone 1, 2 and 3 being
the A group and 4, 5 and 6 the B group. Except for
zone 1, each zone contains an input selection switch
allowing it to receive either a “Global” main signal
or “Local” zone signal. The group A amplifiers can
thus receive a Global-A signal (fed to the zone 1 RCA
input) and the group-B amplifiers can receive either
the same group-A signal by setting zone 4’s input
selector to “Zone 1”, or receive its own global-B signal (fed to the Zone 4 RCA input). With the input
selection switch of a zone set to its own zone, the
zone amplifiers receive the signal via the RCA jacks
of that zone.
Trigger Mode Switch
On
Setting the trigger mode switch to the ON position
allows the LDS12/900 to stay “on” all the time. None
of the amplifiers will enter the standby mode. The
power to the amplifiers can only be turned off by
turning off the front panel power switch or disconnecting the power cord.
Music
Setting the trigger mode switch to MUSIC position
sets the LDS12/900 into auto-on-standby power control mode. The amplifier can sense a very low level
music signal fed to any of the signal inputs which
will turn the amplifier into an active state and will
play the music. When the music stops and no further
signal is received for more than 5 to 7 minutes (typically), the amplifier will turn into a standby mode,
which cuts off the power consumption substantially
and turns off all the green zone LEDs (on the rear
panel). The amplifier will wake up from the standby
mode, or sleep mode, whenever it receives a music
signal again.
12V
Setting the trigger mode switch to 12V allows the
power-on-standby function of LDS12/900 to be controlled by a 12V DC voltage connected to the 12V
input connector on the far bottom-left of group A and
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group B amplifiers. When 12V DC is present at the
12V trigger input, the amplifier will turn on, and when
the 12V disappears the amplifier will enter the standby
mode in a few seconds. Under standby mode, no music signal will go through the amplifier and there’s no
output sent to the speakers. The amplifier will wake
up from the standby mode whenever it receives a 12V
trigger input.
Speaker Terminals and Speaker
Stereo/Mono/Bridged Switch
Stereo
Setting the switch to STEREO operates a zone
amplifier, in a regular 2-channel, stereo mode.
Mono
Setting the swtich to MONO sums the left and
right inputs together and plays the same signal to
both the left and right speakers.
Loads
Each LDS12/900 provides one set of speaker terminals per zone for left and right speaker connections.
When operating a zone amplifier under a stereo or
mono mode, use only a speaker of 4 ohms or greater
impedance for your installation. But when operating
in BRGD (bridge mode) use only a speaker of 8 ohms
or greater impedance.
Home Theater Applications
10 of the 12 channels of the LDS12/900 can be bridged
into 5 channels for Home Theater applications, with
two channels left for a stereo second zone. T o configure the amplifier for this application, refer to Figure 6
on page 9 and carefully make all the necessary cable/
wire connections. Notice that the left channel input
and left channel volume control of every bridged zone
amp are not used under this operating mode.
Bridging
Setting the switch to BRGD operates a zone amplifier in the bridged mode, which turns the output of the left channel into the same signal as the
right channel but in the opposite polarity. Under
this bridged mode, a speaker of 8 ohms minimum
impedance can be connected between the positive (marked “+”) polarity of the right speaker terminal and the positive polarity (marked “+”) of
the left speaker terminal in order to receive a twotime output voltage (for higher power output). The
positive polarity of the speaker shall be connected
to the “+” terminal of the right channel for the
speaker to be in the correct phase.
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Three Year Limited Warranty
Subject to the terms and conditions stated below, Sherbourn Technologies, Inc. (Sherbourn)
warrants to the original owner that this model
LDS12/900 shall be free from defects in workmanship or materials for a term of thr ee (3) years
from its date of purchase from an Authorized
Sherbourn Dealer. Transfer of this product by
its original owner (the ‘Owner’) will automatically terminate this W arranty regardless of when
occurring.
In the event of any defect covered by this warranty ,
Sherbourn shall provide all parts, materials, and labor necessary to restore the Product to its original
specifications, and shall return the Product to its
owner at Sherbourn’s expense. In the alternative,
Sherbourn may at its sole option either replace the
Product without charge, or if its replacement is not
commercially practicable or repair or replacement
cannot be accomplished within a reasonable time,
Sherbourn may refund the purchase price of the
Product, subject where appropriate to reasonable depreciation for actual use in accordance with applicable laws, in full satisfaction of its warranty obligations.
Sherbourn’s sole obligation under this warranty
shall be to repair or replace the product, or at its
option refund the purchase price, as provided for
hereinabove. Sherbourn does not warrant against,
nor shall it be liable for, any of the following: removal or installation charges, shipping expenses
to Sherbourn or its authorized service facility, loss
of use, property damage of any kind, or other incidental or consequential damage or losses of any
kind.
Note: Some states do not allow exclusion or limitation of consequential damages, so the foregoing exclusions may not apply to you.
This warranty does not cover any of the following:
(a) cabinetry, trim, or other appearance items (except where they are defective at the time of original
sale and the Product is delivered for repair within
the first thirty days (30) thereafter): (b) failures arising from accident, catastrophe, misuse, neglect, or
failure to properly connect and operate the product
in accordance with the accompanying instruction:
(c) failures arising from improper installation of the
Product or incompatibility of other components in
the system of which the Product is a part: (d) failures of any kind in products (i) which have been
purchased from other than Authorized Sherbourn
dealers, or (ii) which evidence any tampering, alter-
ation, or attempted servicing by anyone other than
Sherbourn or an Authorized Sherbourn Service Facility; and Sherbourn shall have no liability or obligation of any kind with respect to any of the foregoing losses types of failures.
To obtain service under this Warranty, the Owner
must first obtain from Sherbourn a Return Authorization Number, and must then, at the owner ’s expense (i) arrange for any necessary de-installation
of the Product, and (ii) deliver or ship the Product,
properly packaged and clearly identified with the
Return Authorization Number, prepaid, and insured,
to Sherbourn at the address shown below, or to an
Authorized Sherbourn Service Facility . In addition,
the Owner must provide evidence that the Product
is at the time of delivery within the scope of this
W arranty, by including the ORIGINAL dated sales
receipt with the Product when submitted for repair .
Safeguard your original sales receipt, as it may be
required to validate Warranty coverage
The owner is solely responsible for payment of all
expenses for removing the Product from its installation, delivering it to Sherbourn or an Authorized
Sherbourn Service Facility, and reinstalling it following repair, as well as for any repairs made to
Products which are subject to the exclusions noted
above.
In order to learn the name and address of the nearest
Authorized Sherbourn Service Facility , obtain a Return Authorization Number and shipping instructions, or obtain answers to any other questions you
may have concerning this Warranty, you may telephone Sherbourn between the hours of 9:00 am and
5:00 pm Eastern Standard Time, Monday through
Friday at (978) 663-7385, or write to our Service
Department at Sherbourn T echnologies, Inc., 19-3A
Sterling Road, North Billerica, MA 01862.
This warranty gives you specific legal rights, and
you may also have other rights which vary from state
to state.
If this product has been purchased outside of the
United States of America, you should contact your
local dealer or distributor to determine the warranty
coverage provided in your country .
Sherbourn T echnologies, Inc.
19-3A Sterling Road,
North Billerica, MA 01862
Tel (978) 663-7385
Fax (978) 663-7389
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Notes
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Sherbourn
Sherbourn Technologies, Inc., 19-3A Sterling Road, North Billerica, MA 01862
Tel (978) 663-7385 Fax (978) 663-7389 Web www.sherbourn.com
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