Dayton Audio SPA250 Manual De Usuario

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1.) 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.

2.) Low-Level Outputs (Left/Right)
This output allows the low level input signal to be daisy chained
to other amplifiers. The low level input is simply passed through
with no alteration (EQ) to the original signal.

3.) High-Level Inputs
Speaker level inputs using binding post type jacks to permit
connection with banana type plugs or spade terminals. Allows
the user to connect the speaker level output of a full range
amplifier to the input of the subwoofer amp using standard
speaker wire. A mono signal is derived from the stereo, which
then feeds the subwoofer amplifier crossover input.

4.) High-Level Outputs
Speaker level outputs using binding post type jacks to permit
connection with banana type plugs or bare wire. Used to con-
nect from the subwoofer amp to pass signal from the full range
amp on to the main L/R speakers. Signal is only present on
this output if the high level input is also used. The signal to
the L/R speakers will be shaped by an internal 6 dB/octave
125 Hz high pass filter.

5.) 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 115V operation. It is supplied with a 5 A, 250V
fuse and USA type power cord. In most 230V applications a
separate  power  cord  and  2.5A,  250V  fuse  will  be  required
and are not included.

6.) Gain
This control will match the amplifier’s input sensitivity to the
output of the pre-amp source. If the source output has a vari-
able 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 to be the “volume
control” for the subwoofer system.

7.) Frequency
This control is used to establish the highest frequency that
the subwoofer will reproduce and has a range between 40 to
180 Hz with a slope of 24 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 the amp with a LFE (Low

Frequency Effects) output on a pre-amp or home theatre re-
ceiver the internal low pass filter circuitry should be bypassed
by turning the frequency control to maximum (180Hz). The
home theater receiver should be used to control the low pass
crossover frequency.

8.) Power LED
When the power switch is moved to the “on” position, the LED
will illuminate green, and the amp will be in “On” mode. When
set in the “Auto” position the unit will be in the stand by mode. In
this position, if a low level signal of about 10 millivolts or greater
is applied to the input, the light will change green to indicate
that the amplifier is fully operational and receiving typical music
program. If an input signal is not detected for 10 to 15 minutes,
the amp will go back to “stand by” mode and the LED will turn
off. If the protection circuit detects a short circuit or thermal
overload the unit will shut down and the LED will turn red.

9.) Power Switch
On, Off and Auto mode. 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 10-15 minutes after the input signal stops.

10.) Phase
This two-position (NOR = 0° phase and REV = 180° phase)
switch helps to compensate for differences in the acoustical
and electrical characteristics between the subwoofer and the
main system 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 “NOR” setting would be considered the normal or default
setting, but be sure to experiment during system set-up.

11.) Voltage Selector Switch
This switch allows the user to select 115V or 230V operation.
The unit is set at the factory for 115V operation and contains
a 5A, 250V fuse. When operating at 230V be sure to change
the fuse to a 2.5A, 250V fuse.

12.) 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 wire uses an insulated .250" quick
disconnect and the black wire uses an insulated .205" quick
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).

13.) Bass Boost:
Selects a bass boost filter with +6dB @ 35Hz. Allows the user
to add boost to the low end response. Remove plug to access
switch