Dynasound DS1625 User manual

DS1625
SOUNDMASKING AMPLIFIER
03/01/10

TABLE OF CONTENTS
Front Panel
Rear Panel
Specifications
Warranty
pg. 3
pg. 4
pg. 5
pg. 6
INTRODUCTION
Dynasound’s DS1625 soundmasking amplifier delivers a full 250 Watts of power into direct or
distributed speaker systems. The DS1625 is designed for reliable service in permanent
installations, and comes complete with short-circuit and thermal protection, including front/rear panel
indicators and automatic reset. Plug-in barrier strip input and screw terminal outputs provide
trouble-free, dependable connections. DS1625 amplifier is UL listed and carry Dynasound a five-
year systems warranty.
DS1625 features include:
250 watts at all outputs (4Ω direct & transformer)
internal transformer (8Ω, 70V, 25V, & 25V-CT outputs)
signal/peak & temp/fault indicators on front & rear panels
balanced/unbalanced input selector on rear panel
level control & input sensitivity selector on rear panel
high-pass filter selector on rear panel (12dB/oct. @ 125Hz)
input on plug-in barrier - outputs on screw terminals
complete speaker, short-circuit, & thermal protection
variable speed fan (quiet, reliable - no filter maintenance)
incorporates AES recommended grounding practices
covered by a Dynasound five-year systems warranty
UL / C-UL listed
IMPORTANT SAFETY INFORMATION
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with a dry cloth.
Do not block any of the ventilation openings.
Install in accordance with the manufacturers
instructions.
WARNING - To reduce the risk of electric shock, do not
expose this apparatus to rain or moisture.
Unplug this apparatus during lightning storms or when
unused for long periods of time.
Apparatus shall not be exposed to dripping or splashing
and no objects filled with liquids, such as vases, shall be
placed on the apparatus.
Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has
two blades and a third grounding prong. The wide blade
or the third prong are provided for your safety. When 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.
Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been
dropped.
Explanation of safety related markings and symbols which appear on the outside of the apparatus.
Lightning Bolt: Hazardous Live voltages present when this unit is in operation. Do not touch terminals
marked with this symbol while the unit is connected to live power.
Exclamation Point: Replace components (i.e., fuses) only with the values specified by the
manufacturer. Failure to do so will compromise safe operation of this unit.

DS1625 FRONT PANEL
On Indicator: This green LED remains lit when AC power is applied to the unit.
Signal / Peak Indicator: This 2-color LED indicates the signal level for the amplifier. When the LED is green, the amplifier has signal
(above -30dB). When the LED is red, the amplifier signal is clipping (maximum power). CAUTION: Signal levels should be adjusted
to avoid clipping. Clipping can cause severe distortion, over-temperature conditions, and even loudspeaker damage. NOTE: Signal /
Peak indicators will turn off during Temp / Fault conditions (see Temp / Fault Indicators below). This indicator also appears on the rear
panel.
Temp / Fault Indicator: This red LED indicates over-temperature and output fault conditions for the amplifier. When the LED
remains lit, the amplifier has an over-temperature condition. When the LED is flashing, the amplifier has an output fault condition.
Either condition will temporarily de-activate the amplifier, causing the Signal / Peak LED to turn off as well. The amplifier will attempt
to self-reset once the over-temperature or output fault condition is resolved. This indicator also appears on the rear panel.
CAUTION: The DS1625 is cooled by a variable speed fan, which exhausts warm air from the left side panel. To allow proper
ventilation, an un-obstructed clearance of at least 0.75" must be maintained along the left side panel of th e DS1625.
REAR PANEL
Input: This plug-in barrier strip provides the line-level input to the amplifier. For unbalanced input, wire high (+) and ground (). For
balanced input, wire high (+), low (-), and ground (). NOTE: The UNBAL / BAL switch must be in the appropriate position (see below).
Level: This screw-driver adjustable control determines the level of input signals allowed into the amplifier. Level provides a gain range
from 'off' (min.) to 'unity' (max.). The Level control is factory set for -20dB of gain, which will produce maximum output power with input
signal peaks of +20dBu. For best performance, first adjust the source signals for optimum (maximum) levels, then adjust the amplifier
Level control for the desired volume.

Signal / Peak Indicator: This 2-color LED indicates the signal level for the amplifier. When the LED is green, the amplifier has signal
(above -30dB). When the LED is red, the amplifier signal is clipping (max. power). CAUTION: Signal levels should be adjusted to avoid
clipping. Clipping can cause severe distortion, over-temperature conditions, and even loudspeaker damage. NOTE: Signal / Peak
indicators will turn off during Temp / Fault conditions (see Temp / Fault Indicators below). This indicator also appears on the front panel.
Temp / Fault Indicator: This red LED indicates over-temperature and output fault conditions for the amplifier. When the LED remains lit,
the amplifier has an over-temperature condition. When the LED is flashing, the amplifier has an output fault condition. Either condition will
temporarily de-activate the amplifier, causing the Signal / Peak LED to turn off as well. The amplifier will attempt to self-reset once the
over-temperature or output fault condition is resolved. This indicator also appears on the front panel. CAUTION: The DS1625 is cooled
by a variable speed fan, which exhausts warm air from the left side panel. To allow proper ventilation, an un-obstructed
clearance of at least 0.75" must be maintained along the left side panel of the DS1625.
HPF Switch: This DIP switch provides a High-Pass Filter for the amplifier input. The High-Pass Filter is used to eliminate unnecessary
lower frequencies (12dB/octave @ 125Hz) for speech and distributed speaker applications. From the factory, the High-Pass Filter is
enabled (switch down). To disable the High-Pass Filter, move the switch to the up position. CAUTION: To avoid output fault conditions,
the High-Pass Filter must be enabled when driving 25-Volt or 70-Volt speaker systems (see Output below). Also, any other system
equalization affecting frequencies below 125 Hz should remain flat or be used as cut-only.
775mV / 300mV Switch: This DIP switch selects 0.775Vrms (-0dBu) or 0.3Vrms (-8dBu) as input sensitivity for the amplifier. From the
factory, input sensitivity is set for 775mV (switch up). Use the 775mV setting for 'professional' line-level input signals (such as from an
audio mixer or processor), or use the 300mV setting for 'consumer' line-level signals (such as from a CD player or tape deck).
UNBAL / BAL Switch: This DIP switch selects unbalanced or balanced input connection. From the factory, input connection is set for
UNBAL (switch up). Use UNBAL for 2-conductor connections, and use BAL for 3-wire connections (see Input above).
Output: These screw terminals provide the speaker outputs from the amplifier. From the factory, a jumper wire is installed from the 4
terminal (direct output) to the XFMR INPUT terminal. For transformer (xfmr) output, connect speaker negative to the COM OUT terminal,
and connect speaker positive to the appropriate transformer output terminal (8  for an 8 ohm speaker load; 70V for a 70-Volt distributed
speaker system; 25V for a 25-Volt distributed speaker system). For 'balanced' 25V speaker systems, connections are the same as above,
plus a ground connection (center-tap) made to the 25V CT terminal. For direct output from the amplifier, first remove the factory installed
jumper wire, then connect speaker negative to the GND terminal, and connect speaker positive to the 4terminal.
AC Power Entrance: The switch applies AC power to the unit. The receptacle accepts the detachable AC Power Cord. The AC Power
Cord is for connection to three-prong grounded AC outlets. CAUTION: Do not remove or defeat the ground prong on the AC Power Cord,
as this constitutes a shock hazard.
Fuse: Replace Fuse with same type and value only (6 A 250 V). NOTE: If the Fuse continues to blow, the amplifier may require service.

SPECIFICATIONS
Continuous Power (4 ohm direct & transformer outputs):
Signal-to-Noise Ratio (20Hz~20kHz):
referenced to 250 watts into 4 ohm direct output
Total Harmonic Distortion:
20Hz~20kHz @ 250 watts into 4 ohm direct output
100Hz~15kHz @ 250 watts at transformer outputs
Intermodulation Distortion (SMPTE):
Frequency Response (20Hz~20kHz):
Input Impedance:
balanced
unbalanced
Input Sensitivity (selectable):
Power Requirements:
Power Consumption:
Dimensions (H x W x D):
Weight:
250 watts
> 90dB
< 0.2%
< 1.0%
< 0.35%
+0/-1dB
20k ohms
10k ohms
775mV / 300mV
120VAC @ 60Hz
900 watts
3.5" x 19" x 8.5" (89 x 483 x 216mm)
23 lbs. (10.5kg)

WARRANTY
DYNASOUND IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR LIMITED
WARRANTY TO THE ORIGINAL PURCHASER OF THE PROFESSIONAL
SOUNDMASKING EQUIPMENT DESCRIBED IN THIS MANUAL.
DYNASOUND expressly warrants this product to be
free from defects in material and workmanship for a
period of 5 YEARS from the date of purchase as a
new product from an authorized DYNASOUND dealer
under the following conditions.
1. In the event the warranted DYNASOUND product
requires service during the warranty period,
DYNASOUND will repair or replace, at its option,
defective materials, provided that the original
purchaser attains a Return To Manufacturer
Authorization (RMA) number by contacting
DYNASOUND, then shipping or transporting the unit
to the manufacturer at the address below.
Transportation and insurance charges to the
DYNASOUND factory for warranted products or
components thereof to obtain repairs shall be the
responsibility of the purchaser. DYNASOUND will
return ship the product at factory expense in the same
manner received.
2. This warranty will be VOIDED if the serial number
has been removed or defaced; or if the product has
been subjected to accidental damage, abuse, rental
usage, alterations, or attempted repair by any person
not authorized by DYNASOUND to make repairs; or if
the product has been installed contrary to
DYNASOUND Systems's recommendations.
3. Electro-mechanical fans, electrolytic capacitors,
and the normal wear and tear of appearance items
such as paint, knobs, handles, and covers are not
covered under this warranty.
4. DYNASOUND SHALL NOT IN ANY EVENT BE LIABLE
FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, INCLUDING LOST PROFITS, LOSS OF USE,
PROPERTY DAMAGE, INJURY TO GOODWILL, OR
OTHER ECONOMIC LOSS OF ANY SORT. EXCEPT AS
EXPRESSLY PROVIDED HEREIN, DYNASOUND
DISCLAIMS ALL OTHER LIABILITY TO PURCHASER OR
ANY OTHER PERSONS ARISING OUT OF USE OR
PERFORMANCE OF THE PRODUCT, INCLUDING
LIABILITY FOR NEGLIGENCE OR STRICT LIABILITY IN
TORT.
5. THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES EXPRESSED OR IMPLIED. DYNASOUND
EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THE REMEDIES SET FORTH
HEREIN SHALL BE THE PURCHASER'S SOLE AND
EXCLUSIVE REMEDIES WITH RESPECT TO ANY
DEFECTIVE PRODUCT. THE AGENTS, EMPLOYEES,
DISTRIBUTORS, AND DEALERS OF DYNASOUND
PRODUCTS ARE NOT AUTHORIZED TO MODIFY THIS
WARRANTY OR TO MAKE ADDITIONAL WARRANTIES
BINDING ON DYNASOUND SYSTEMS. ACCORDINGLY,
ADDITIONAL STATEMENTS SUCH AS DEALER
ADVERTISEMENTS OR REPRESENTATIONS DO NOT
CONSTITUTE WARRANTIES BY DYNASOUND.
6. No action for breach of this warranty may be
commenced more than one year after the expiration of this
warranty.
Dynasound Soundmasking Solutions
6439 Atlantic Boulevard
Norcross, Georgia 30071
Nationwide [phone]
In Georgia [phone]
www.soundmasking.com