DAYTON AUDIO SPA100-D Subwoofer Plate Amplifier User Manual
- June 17, 2024
- DAYTON AUDIO
Table of Contents
DAYTON AUDIO SPA100-D Subwoofer Plate Amplifier
Model: SPA100-D User Manual
Thank you for purchasing the Dayton Audio® SPA100-D Subwoofer Amplifier. It has been designed and built to provide years of high quality sound reproduction, and is ideal for use in both home stereo and home theatre systems. This amplifier has been engineered to include features like low level audio connections, adjustable crossover frequency, adjustable level, switchable bass boost (6 dB @ 35 Hz), auto on/off circuit activated by input signal, and comprehensive internal protection against shorted speaker loads, thermal faults, and overload conditions.
FEATURES:
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Efficient class-D design keeps size and weight to a minimum
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Adjustable level to match the output of the main speakers
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Auto-on feature conserves power when no signal is present
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Variable 40 to 200 Hz low-pass crossover for a smooth transition to 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
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Compatible with 120 and 240 VAC input (use 2A fuse with 240 VAC)
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Full complement of protection circuitry for reliable operation
INPUT/OUTPUT CONNECTIONS:
1. 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
USA type power cord. In most 230/240VAC applications a separate power cord and
2A, 250V fuse will be required (not included).
2. 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 in order
to drive the amplifier to full output. Note: If using a LFE output from a
preamp or receiver connect it to the Left (mono) input.
3. 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:
4. 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 stand-by the
LED will be red. As the output signal increases to the onset of clipping the
LED will flash red, this indicates that the clip limiting circuitry is
activated.
5. 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 con-trol, 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.
6. 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 pre-amp or home theatre receiver with a 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.
7. 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 set-up.
8. 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.
9. 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.
10. 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 (de-pending 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 amplifi er when not installed into an enclosure. No user serviceable parts inside.
If the provided plug does not fi t into your outlet, consult an electrician for replacement of the obsolete outlet. Refer servicing to qualifi ed personnel. To reduce the risk of fi re and shock do not expose unit to rain or moisture. Clean only with 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 amplifi er 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 amplifi ers). 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 specifi ed 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
daytonaudio.com
tel + 937.743.8248
info@daytonaudio.com
705 Pleasant Valley Dr.
Springboro, OH 45066
USA
Frequently Asked Questions (FAQ)
1. Q: What is the power output of the amplifier?
A: The amplifier has a power output of 100 Watts.
2. Q: How do I connect the subwoofer driver to the amplifier?
A: Connect the rear-mounted output lead of the amplifier to the subwoofer driver. Ensure proper polarity (red = positive, black = negative).
3. Q: What does the Power/Clipping LED indicate?
A: The LED indicates the current status of the amplifier.
Glowing blue means the amplifier is on, red means stand-by mode, and flashing
red means the clip limiting circuitry is activated as the output signal
increases to the onset of clipping.
4. Q: How does the Bass Boost feature work?
A: The Bass Boost feature allows you to add a 6 dB boost to the response centered at 35 Hz. It is used to extend the low-end response of designs with decreased output below 45 Hz. However, use caution as it can sometimes push a driver beyond its excursion limits.