Dayton Audio SPA100-D Subwoofer Plate Amplifier User Manual

Dayton Audio SPA100-D Subwoofer Plate Amplifier

FEATURES

• Efficient class-D design keeps size and weight to a minimum
• Adjustable level to match the output of the main speakers
• Auto-on feature conserves power when no signal is present
• Variable 40 to 200 Hz low-pass crossover for a smooth transition to the main speakers
• Switchable 6 dB @ 35 Hz bass boost for maximum performance from smaller drivers and enclosures
• 0° to 180° phase switch for better integration
• Compatible with 120 and 240 VAC input (use a 2A fuse with 240 VAC)
• Full complement of protection circuitry for reliable operation

INPUT/OUTPUT CONNECTIONS

Power Input

This unit features an IEC-type power jack. This allows the user to change the power cord depending on the country and voltage used. The IEC jack also houses an integrated fuse holder that contains the AC line fuse. The unit is set at the factory for 115/120VAC operation. It is supplied with a 4 A, 250V fuse and a USA USA-type power cord. In most 230/240VAC applications, a separate power cord and 2A, 250V fuse will be required (not included).

Low-Level Inputs (Left/Right)

RCA-style jacks that will accept standard line-level inputs from a pre-amp level source. They will accept a stereo signal and internally combine it into mono. Both left and right input jacks must be connected to the source to drive the amplifier to full output.
Note: If using an LFE output from a preamp or receiver, connect it to the Left (mono) input.

Output Lead for Subwoofer Driver

This rear-mounted output lead connects the amplifier to the subwoofer driver. The output lead is roughly 20″ long and is color-coded. The red and black wires each include an insulated .250″ disconnect. These connectors can be easily removed if your driver requires another size or type of connector. Be sure to observe proper polarity when connecting the amplifier to your subwoofer driver (red = positive, black = negative).

CONTROLS/INDICATORS

Power/Clipping LED

This LED indicator will display the current status of the amplifier. When the amplifier is on, the LED will glow blue. When the amplifier is in standby, the LED will be red. As the output signal increases to the onset of clippi, the LED will flash; ed, this indicates that the clip limiting circuitry is activated.

Volume (Gain)

This control will match the amplifier’s input sensitivity to the output of the pre-amp source. If the source output has a variable control, we recommend that the user spend a moment or two determining the best balance between the two controls. When a balance is found between low noise, linear level control, and sufficient level to drive the amp to the required output, the gain knob can be considered the “volume control” for the subwoofer system.

Frequency (Low-pass crossover)

This control is used to establish the highest frequency that the subwoofer will reproduce and has a range between 40 to 200 Hz with a slope of 18 dB per octave. If you are using the system for music and your main speakers have good bass capability, you could set the control to a fairly low value at 40, 60, or even 100 Hz. If the main speakers are smaller or do not have much bass output, set the control higher. Experiment with the amount of “overlap” that you will experience when all speakers are playing in the same range. This can be helpful when integrating the subwoofer with the rest of the system and with the room. Note: When using a preamp or home theatre receiver with an LFE (Low Frequency Effects) output, the internal low-pass filter circuitry should be bypassed by turning the frequency control to maximum (200 Hz). The pre-amp or home theater receiver should be used to control the low-pass crossover frequency.

Phase

This two-position switch helps to compensate for differences in the acoustical and electrical characteristics between the subwoofer and the main speakers. The relative locations of speakers in the system can cause significant disturbances in speaker interaction due to time delay issues or the destructive phase interferences that can occur at certain frequencies. The use of this switch in conjunction with altering the location of the subwoofer can have a dramatic effect on system integration. The 0° setting would be considered the normal or default setting, but be sure to experiment during system setup

Auto Turn On/Off

When the “Auto” position is selected, the amp is in stand-by mode until an input signal of about 10 millivolts or greater is detected. The amp will go back to standby mode 15-18 minutes after the input signal stops. In the “Off” position, the amplifier is in stand-by mode. In the “On” position, the amplifier is always on.

Bass Boost

This allows the user to add a 6 dB boost to the response centered at 35 Hz. This bass boost is generally used to extend the low-end response of designs with decreased output below 45 Hz. Bass boost is most commonly used on sealed and low-tuned vented/passive radiator designs. Note: Use caution when using bass boost. With low excursion drivers or designs tuned higher than 35 Hz, the bass boost can sometimes push a driver beyond its excursion limits.

Main Power Switch

Main power disconnect. In the “Off” position, the amplifier is off. In the “On” position, the amplifier will be either on or in stand-by (depending on the position of the Auto Turn On/Off switch). If you will not be using the subwoofer for a long period of time, then switch this to the “Off” position so the amplifier will not use any power.

SPECIFICATIONS

• Rated Power Output: 100 watts RMS into 4 ohms @ < 1.0% THD
• Signal to Noise Ratio: 90 dB A-weighted
• Maximum Input Sensitivity Voltage: 180 mV
• Bass Boost: Switchable, 6 dB @ 35 Hz
• Low Pass Adjustment: Variable 40 Hz – 200 Hz
• Phase Adjustment: Switched 0° or 180°
• Dimensions: 8-1/16″ H x 7-1/16″ W x 2-1/8″ D
• Enclosure Cutout: 7″ H x 6″ W
• Power Requirements: 115/230 VAC, 60 Hz/50 Hz, 100W
• Stand-By Power Rating: < 8.5W
• Weight: 1.6 lbs.

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.

To reduce the risk of electric shock, never use this amplifier when not installed in an enclosure. No user serviceable parts inside. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Refer servicing to qualified personnel. To reduce the risk of fire and shock, do not expose the unit to water or moisture. Clean only with a dry cloth. Unplug the unit during lightning storms or when unused for long periods of time. The unit should be operated in a well-ventilated area. Minimum clearance is 2 inches from the amplifier plate to allow proper heat dissipation. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus which produce heat (including amplifiers Protect the power cord from being stepped on or pinched, particularly at the plugs, convenience receptacles, and at the point where they exit the unit.

Only use attachments/accessories specified by the manufacturer.

Note: Unit is set at the factory for 115/120V operation. Be sure to change the fuse to a 2A rating before switching to 230/240V operation.

5-Year Limited Warranty

See daytonaudio.com for details..

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Dayton Audio SPA100-D Subwoofer Plate Amplifier- FAQs