DaytonAudio SPA500 Посібник користувача - Сторінка 3

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INPUT CONNECTIONS

1.) Left/Right inputs

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. The use of a "Y" cord is suggested if a

mono source is all that is available.

2.) LFE direct input

RCA jack that will accept a signal from the mono LFE (Low

Frequency Effects) output on a pre-amp or receiver that is

equipped with a dedicated sub bass output. This input by-

passes the amplifier's own internal low pass filter circuitry,

relying instead on the processed output provided by the source

equipment. This would be the recommended connection for

most home theater surround sound receivers and pre-amps.

We would also suggest the use of the LFE input when an

external line level electronic crossover or frequency dividing

network is used.

3.) Power input

This unit features an IEC grounding type power input connec-

tor. The IEC inlet connector also features an integrated fuse

holder that contains the AC line fuse. For 230V input, remove

the fuse holder, rotate 180 degrees, and re-install. In most

230V applications a separate power cord will be required

and is not included.

CONTROLS/INDICATORS

4.) Low Pass, Gain

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 deter-

mining 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.

5.) Low Pass, Frequency

This control is used to establish the highest frequency that

the subwoofer will reproduce and has a range between 30

and 200 Hz. If your main speakers have good bass capabil-

ity, 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.

6.) Power Switch

This switch manually turns the unit on and off. When switched

to the on position, the unit will first turn on and be fully opera-

tional. After a period of 10-15 minutes without a signal the unit

will go into "stand by" mode.

7.) Power LED

When the power switch is moved to the "on" position, the

LED will illuminate in green, and the amp will be in "stand

by" mode. If a low level signal of about 3 millivolts or greater

is applied to the input, the light will change color to yellow to

indicate that the amplifier is fully operational and receiving

typical music program. As input signal increases to the onset

of clipping the LED will turn red, which indicates that the clip

limiting circuitry is activated. 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 change back to green.

8.) 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.

PARAMETRIC EQUALIZER

The SPA500 features a fully parametric equalizer to help you

to achieve the best possible subwoofer performance. Profes-

sional sound engineers have for many years considered the

parametric EQ to be one of the most accurate, versatile, and

high fidelity tools for audio enhancement. A greater degree of

control can be achieved when using the EQ's unique ability

to vary the frequency to be affected, the amount of boost or

cut, and the width or narrowness at the selected frequency.

9.) EQ-Frequency

Establishes the specific frequency at which EQ boost or cut

may be applied between 18 Hz and 80 Hz.

10.) EQ-Bandwidth

Determines how narrow or wide the EQ curve will be within a

range of 0.1 to 1.0. If for example a frequency of 60 Hz were

selected along with a Q of 0.1, the frequencies to either side

of 60 Hz would be less affected. This is a narrow bandwidth

that could be useful for "surgically" removing an offending peak

without disturbing adjacent frequencies. At the other extreme,

a Q of 1 would result in a much broader effect which could

be used for smooth overall bass boost or cut, to balance the

overall tone character of the sub.

11.) EQ-Level

Permits the application of up to 6 dB of boost or 14.5 dB of cut

at the selected frequency and bandwidth. Setting the control

at the 0 position effectively removes the EQ from the circuit

path. It is good to remember that high levels of boost reduce

amplifier headroom; it is the same as turning up the low pass

gain control but only at the selected EQ frequencies. It would

be helpful to reduce or increase the low pass gain control to

balance the amount of cut or boost applied by the EQ.

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).

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