OSD AUDIO OSD SMP300 Subwoofer Amplifier Owner’s Manual

: June 4, 2024
: OSD AUDIO

Table of Contents

SAFETY
PLACEMENT
INSTALLATION
OPERATION
TROUBLESHOOTING
WARRANTY & REPAIR
FEATURES AND SPECIFICATIONS
Specifications:
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OSD SMP300 Subwoofer Amplifier
Owner’s Manual

SAFETY

CAUTION: To reduce the risk of electric shock, do not remove the cover or back. No user-serviceable parts inside. Refer servicing to qualified service personnel.
The lightning flash with an arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un-insulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

IMPORTANT SAFETY INSTRUCTIONS

Read these instructions – All the safety and operating instructions should be read before this product is operated.
Keep these instructions – The safety and operating instructions should be retained for future reference.
Heed all warnings – All warnings on the appliance and in the operating instructions should be adhered to.
Fo ll ow all instructions – All operating and use instructions should be followed.
Do not use this apparatus near water – The appliance should not be used near water or moisture – for example, in a wet basement or near a swimming pool, and the like.
Clean only with a dry cloth.
Do not block any ventilation openings. Install in accordance with the manufactures instructions.
Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ample fie rs) that produce heat.
Do not defeat the safety purpose of the polarized or grounding plug. A polarized plug has two blades one wider than the other. A grounding plug has two blades and a third grounding prong . The wide blade or the third pro ng is provided for your safety. 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 part ICU early at the plugs, convenience receptacles, and at the point where they exit from the apparatus.
Only use attachments/accessories specified by the manufacturer.
Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart or rack is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
Unplug the apparatus during lightning storms or when unused for long periods of time.
Refer all servicing to qualified personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply co rd or plug is damaged, liquid has been spi ll ed or objects have fallen into the apparatus has been exposed to rain or mo isture, does not operate normall y, or has been dropped.
CAUTION: These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
The main plug or appliance coupler is used as the disconnect device, the disconnect device shall remain readily operable.
Do not block any ventilation openings. Leave open space around the equipment. Never place equipment on a bed, sofa, rug, or any other similar surface. Do not place equipment close to drapes/curtains/walls or in a bookcase, built-in cabinet, or any other similar place that may cause poor ventilation.
Equipment should be connected to the main socket outlet with a protective ground connection.
The user should not attempt to service the equipment beyond those means described in the operating instructions.
Voltage se lecto r: Used to adjust the input t rating (1 20 Vac/60 Hz and 230 Vac/50 Hz), insert the main power plug into the socket-outlet with vo stage within the setting of the selector. The current ratings of the main fuse-links are different for different input ratings (see marking for details), and the fitted main fuse link is related to the input rating as the setting of the selector during factory assembly line work, please ask qualified personnel to help you replace the main fuse link before you adjust tl1e voltage selector. The product can be supplied by two different main voltages (120 Vac and 230 Vac) that can be selected by adjusting the voltage selector on the rear panel. The voltage selector must be set to match the current main voltage and always checked before inserting the main plug into a socket outlet.
WARNING: This class 1 apparatus shall be connected to a main socket outlet with a protective ground connection.
CAUTION: Only make connections when the amplifier power is off.

PLACEMENT

Cong gratulations on your purchase of an OSD Audio Amplifier. Please take a few moments to read the entire manual and be sure to retain this document for future reference. Please read and observe all safety instructions.
WARN ING: To reduce the risk of fire or electric shock, do not expose this amplifier to rain or moisture. The amplifier shall not be exposed to dripping or splashing and objects filled with liquids, such as vases, shall not be placed on or near the amplifier
DO:

Place the amplifier with feet resting firmly on a solid flat level surface.
Place the amplifier in a well-vented area to provide proper cooling. In areas that lack proper ventilation, such as tight cabinets or racks, it may be necessary to install an equipment fan to create airflow.

DON’T:

Do not block ventilation holes on the top or bottom of the amplifier. Never place it on carpeting or other similar material.
Do not place the amplifier in any position other than horizontal with the feet down. Never place it on the side or resting on the back where the terminals are located.
Do not place the amplifier near heat sources or in an area that could be exposed: to moisture or excessive humidity.

YOU SHOULD KNOW

The power supply in this unit may cause a hum that can be heard in other components if they are placed too close to the amplifier.

INSTALLATION

Please use Diag ram 1. to familiarize yourself with the amplifier’s rear panel. OSD AUDIO OSD SMP300 Subwoofer Amplifier Diagram
1

Diagram 1
Amplifier Rear Panel

Connecting the Subwoofer to the Amplifier
CAUTION: Only make connections when the amplifier power is off.
There are two output terminals on the back of the amplifier, one positive and one negative. (Diagram 1 ). 3-way binding post output terminals allow for a variety of ways to connect a subwoofer to the amplifier, including stripped wire, spade connectors, etc. The subwoofer must be connected with a minimum of a 14-gauge speaker wire. Be sure all connections are secure.
2. Connecting the Audio Inputs
CAUTION: To avoid possible damage to the Amplifier or Subwoofer, only make connections when the amplifier is turned off.
LFE (Low-Frequency Effects) Input – If your preamplifier or receiver has a Sub output or LFE output you can connect it to the LFE input. Be aware that using the LFE input bypasses the SMP300 ‘s low frequency (low pass) crossover r.
Line Level Inputs (Left & Right> – The line ou tpu ts from a preamplifier or receiver can be connected to the line level inputs of the SMP300 amplifier with RCA cables. If the line level signal is also required by other equipment, you can connect the line level outs to another device. (See the Line Level Outputs section below.)
Speaker Level Inputs (Left & Right> – These inputs can be used if your receiver does not have a subwoofer output or a set of amplifier line-level output jacks. Be sure to observe proper polarity, and connect the left and right pair of main speaker output wires from your amplifier or receiver to the speaker level input terminals of the SMP300 amplifier. Then connect the left and: right pair of speaker wires from the SMP300 amplifiers speaker level output to your main speaker terminals. (See Speaker Level Output Section below)
3. Connecting the Audio Outputs (optional)
Line Level Outputs (Left & Right> – Sources connected to the line level inputs can be forwarded to other receivers or amplifiers line level inputs. By doing this you can pass on the audio signal for use by another component. Connect RCA cables to the line level output sections of the SM P300 and the line level inputs of a receiver or amplifier.
Speaker Level Outputs (Left & Right> – Connect a left and right pair of speaker wires from the SMP300 speaker output terminals to your main speakers. The main speakers will still be powered by your system’s receiver or amplifier.
4. Dual Voltage Switch
(See Diagram 2) For use in the U.S., The SMP300 comes preset from the factory at 11 SV. For use in other countries, the voltage switch may need to be changed to 230V. (Please note that a plug adapter or alternate power cord may be required.)

Diagram 2
Voltage Switch

OPERATION

Please use diagrams 1 & 3 to familiarize yourself with the front and rear panels of the SMP300.
CAUTION: Please read all of the following instructions to prevent causing damage to your system.
FRONT PANEL CONTROLS

Power Switch
The switch marked “power” on the front panel of the amplifier will turn off all amplifier circuitry including Auto Sense circuitry.
Vo lume Controls
Use this to match the output level of the subwoofer to that of the main speakers in the system. We recommend that you play a variety of material before selecting a setting. Start with the control turned completely counterclockwise (off) and slowly turn it up. NOTE: Turning the volume up slowly will prevent possible damage to the woofer from the system being run too “hot”. Very little movement of the knob is needed. CAUTION: If a popping sound (clipping) is audible through the subwoofer, it is being overdriven, reduce the volume on the SM P300, or speaker damage may occur! (See Volume Limit Control for proper adjustment of volume settings to avoid
distortion damage.)
Lo w Pass Filter
Use this control to adjust the upper-frequency limit of the subwoofer. The purpose is to control the overlap of the subwoofer’s upper frequencies and the main speakers’ lower frequencies. If adjusted properly this will provide seamless blending of the subwoofer and the main speakers.
Phase Control
This control allows you to match the arrival times of the sound waves from the subwoofer and the main speakers to your listening area. While the system is playing flip the switch to the 180° setting and back to · until the bass sounds louder or less boomy. Depending on the subwoofer’s placement and room acoustics, this control may have little or no effect.

OSD AUDIO OSD SMP300 Subwoofer Amplifier Diagram 3 REAR PANEL CO NTROL

Vo lume Limit Contro l
(See diagram 1) Use this control to adjust the maximum volume setting for your subwoofer system. With the level control and the front panel, volume turned all the way down (counterclockwise), turn the subwoofer on, and with audio playing through the system adjust the maximum volume level desired. Setting a max volume level will ensure that no clipping or damage wil l occur even when the front panel volume control is turned all the way up.

TROUBLESHOOTING

The SM P300 Subwoofer Amplifier is designed to function trouble free. Most problems occur becau se of operating errors. If you have a problem, please check the troubleshooting list first. If the problem persists, contact tech support at 1-562-697-2600 or e-mail us at Support@osdaudio.com.

Problem	Possible Causes and Solutions
No sound is heard	an Audio to the amplifier Is not connected properly Check

this and other system component manuals to ensure proper connection.
b. The cable is Dail. Use another cable that you know is good.
C Loose of frayed wires Checks for secure clean connections on al speaker wife terminals O. Volume Lena Control is set too low. See Volume Lima Control for adjustment procedure.
1101 buzzing sound is heard| a. The sound may be caused Dy a ground loop In the system. Try to eliminate this by reversing the AC plugs of other components in the system
D. Try plugging the SM P300 into another outlet. C. Other CauSeS may include faulty Cables_
e Amplifier will not turn on| There may be AC power problems Check the AC circuit and plugs. Make sure the power switch is turned on.
D Audio cable to the amplifier is not connected properly Check this and other system component manuals to ensure proper connection
c The cable is bad Use another cable that you know is good
0 Loose or frayed wires. Check for secure dean connections on all speaker wire terminals
a Protection Circuit cuts in entirety and then returns to normal| The circuitry in the amplifier has detected that the amplifier is in danger of overheating Normally, this would happen Infrequently and momentarily If this persists, the amplifier may need more adequate ventilation
itectkon Circuit cuts in, and oils not return to normal| There may be a fault in the wring with the speaker or the amplifier. Turn the power switch on and then on again It the dampener immediately returns to protection mode. turn It off and check all of the wirings including connections at the amplifier. subwoofer and any connections made to the terminals on a wall plate.

WARRANTY & REPAIR

All OSD AUDIO electronics have (2) year Limited Warranty against defects in materials and workmanship. Proof of purchase must accompany all claims. During the warranty period, OSD AUDIO will replace any defective part and correct any defect in workmanship without charging forester parts or labor OSD AUDIO may replace returned electronics with a product of equal value and performance. In such cases, some modifications to the mounting may be necessary and are not OSD AUDIO’s responsibility.
For this warranty to apply, the unit must be installed and used according to its written instructions. If necessary, repairs must be performed by OSD AUDIO. The unit must be returned to OSD AUDIO at the owner’s expense and with prior written permission. Accidental damage and shipping damage are not considered defects, nor is damage resulting from abuse or from seN icing performed by an agency or person not specifically authorized in writing by OSD Audio OSD AUDIO sells products only through authorized dealers and distributors to ensure that customers obtain proper support and service. Any OSD AUDIO product purchased from an unauthorized dealer or another source, including retailers, mail order dealers, and online sales ers will not be honored or serviced under the existing OSD AUDIO warranty policy. Ally’s sale of products by an unauthorized source or another manner not authorized by OSD AUDIO shall void the warranty of the applicable product.
Damage to or destruction of components due to the application of excessive power voids the warranty on those parts. In these cases, repairs will be made on the basis of the retail value of the parts and labor. To return for repairs, you must email customer service at AMA@audiogeargroup.com for a Returned Merchandise Authorization (A MA) number then the unit must be shipped to OSD AUDIO at Omer’s expense, along with a note explaining the nature of service required. Be sure to pack the product(s) in a corrugated container with at least 3 inches of resilient material to protect the unit from damage in transit.
This Warranty Does Not Cover: Damage caused by abuse, accident, misuse, negligence, or improper operation (installation)

Ally products that have been altered or modified
Any product whose identifying number of decal, serial #, etc. has been altered, defaced, or removed
Normal wear and maintenance.

FEATURES AND SPECIFICATIONS

Features:

A compact and powerful digital subwoofer amplifier for home theater applications
Efficient Class D digital technology runs cool under demanding loads
Rated at 500W peak power and 250W continuous RMS (4-ohms)
Includes a front-panel variable low-pass filter for balanced and accurate bass
Additional front panel controls include phase and volume
Multiple input options for older and newer receivers and pre-amps
The auto-sensing feature turns off the amp when the signal is undetected
Dual voltage switchable (120V/230V)