Manual Blaupunkt GTA 270 DSP (page 7 of 48) (English, German, French, Italian, Polish, Portuguese, Spanish)

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GTA 270 DSP

Subwoofer connection

The GTA 270 DSP features three di erent options of con-

necting a subwoofer:

–An active subwoofer or an additional ampli er are con-

nected with a cinch (RCA) cable to the two SUBWOOFER

OUTPUT sockets (see Fig.7). The setting options of the

integrated DSP (Digital Sound Processor) can be used

in this case.

–A passive subwoofer is connected to the bridged loud-

speaker output (see the section "Bridged loudspeaker

connections"). To be able to use the setting options of the

integrated DSP (Digital Sound Processor), the two INPUT

sockets must additionally be connected with a commer-

cially available cinch (RCA) cable with the two SUBWOOFER

OUTPUT sockets (see Fig. 8).

–A passive subwoofer is connected to the bridged loud-

speaker output (see the section "Bridged loudspeaker

connections"). The setting options of the integrated DSP

(Digital Sound Processor) cannot be used in this case.

DSP sound settings (FRONT)

A variety of options is available to optimise the sound of the

connected loudspeakers:

– GAIN control (FRONT)

The GAIN control is used to adjust the input sensitivity

of the power ampli er to the output voltage of your car

sound system preampli er output. The adjustment range

is from 0.2 V to 5 V. If a car sound system of a third party

manufacturer is connected, the input sensitivity must be

adjusted corresponding to the manufacturer data.

A few important explanations in this context:

By turning the GAIN control clockwise, the input sensitivity

of the ampli er and, therefore, also the volume increases.

However, this is not a volume control. In the end position,

it is not possible to achieve a higher ampli er output, even

if it sounds like that at  rst. The system merely increases

the volume faster if the volume control of the car sound

system is turned up.

– FULL/HI/LOW switch and X-OVER control (FRONT)

For the GTA 270 DSP, the type of frequency crossover

("Low-Pass" or "High-Pass") and the desired cut-o fre-

quency can be adjusted for the connected loudspeakers.

Select the cut-o frequency up to which lower frequencies

(high-pass) or higher frequencies (low-pass) should be

blocked. Only frequencies above the cut-o frequency

(high-pass) or below the cut-o frequency (low-pass) are

passed on to the loudspeakers.

The cut-o frequency is dependent upon the frequency

range of the loudspeakers (see recommended frequency

range of the loudspeakers).

"High-Pass" (switch setting: HI)

With a setting of 80 Hz, the ampli er has a frequency range

from 80 Hz to 30,000 Hz.

"Low-Pass" (switch setting: LOW)

This control is active if the switch is in the LOW position,

and allows for setting the desired entry frequency.

Example:

At a setting of 80 Hz, the ampli er has a frequency range

of 10 Hz to 80 Hz.

"Full Range" (switch setting: FULL)

In this switch setting, the frequency control is deactivated

and the entire frequency spectrum is being ampli ed.

– SUBSONIC control (FRONT)

To avoid interferences from extremely low frequencies,

you can use the subsonic  lter to limit the low-frequency

response of the device. The setting of the subsonic  lter

suppresses all frequencies below the de ned frequency.

Example:

At a setting of 40 Hz, the frequency range from 0 Hz to

40Hz is being suppressed.

DSP sound settings (SUBWOOFER)

The following options are available to optimise the sound

for the use of a subwoofer:

– X-OVER control (SUBWOOFER)

For the GTA 270 DSP, the type of frequency crossover

("Low-Pass") can be adjusted. Select the cut-o frequency

up to which higher frequencies should be blocked. Only

frequencies that are below the cut-off frequency are

passed on to the loudspeakers.

Example:

At a setting of 80 Hz, the ampli er has a frequency range

of 10 Hz to 80 Hz.

– SUBSONIC control (SUBWOOFER)

To avoid interferences from extremely low frequencies,

you can use the subsonic  lter to limit the low-frequency

response of the device. The setting of the subsonic  lter

suppresses all frequencies below the de ned frequency.

Example:

At a setting of 40 Hz, the frequency range from 0 Hz to

40Hz is being suppressed.

– PHASE control (SUBWOOFER)

This control allows the stepless change of the phase posi-

tion of the subwoofer from 0° to 180°. It is used for the

 ne tuning with the other connected loudspeakers and if

set correctly, it can prevent any possibly occurring mutual

cancellation of low frequencies within the audio system.

FRONT COMPRESSOR and SUB COMPRESSOR

switches

This function is used to protect the connected loudspeakers

and subwoofer. If the switch is in the ON position, the out-

put volume is reduced by 10 dB. The GTA 270 DSP features

separate switches for the connected loudspeakers (FRONT

COMPRESSOR) and subwoofer (SUB COMPRESSOR).

FRONT dB/Oct and SUBWOOFER dB/Oct

switches

These switches are used to set the attenuation of the in-

stalled filter separately for the connected loudspeakers

and subwoofer. A high value ensures a steep  lter slope,

which translates to a strict separation between blocked and

forwarded frequencies. A low value ensures a soft separa-

tion, which translates to a gradual transition from blocked

to forwarded frequencies. The settings 18, 24 or 48dB per

octave are available for attenuation.

Caution:

If the FRONT switch is set to FULL, the FRONT dB/Oct

switch is without function.

GTA_270_DSP_13LG.indd 7GTA_270_DSP_13LG.indd 7 24.08.12 15:4824.08.12 15:48

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Blaupunkt GTA 270 DSP Manual

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