background image

5

Rear Panel

B-2         CHANNEL        A-2

8-16

 (BRIDGE)

(–)

(+)

4-8

/CHANNEL (STEREO)

B-1         CHANNEL        A-1

8-16

 (BRIDGE)

(–)

+

+

(+)

4-8

/CHANNEL (STEREO)

(BRIDGE)

(PARALLEL)

(BRIDGE)

(PARALLEL)

FILTER

CHANNEL B

CHANNEL A

FREQ.

FREQ.

INPUT

CHANNEL B

CHANNEL A

INPUT

CHANNEL B

CHANNEL A

SPEAKERS

G

G

MODE

CHANNEL B

CHANNEL A

STEREO

PARALLEL

BRIDGE

OFF

LOW CUT

SUB WOOFER

OFF

LOW CUT

SUB WOOFER

20

15

10

6

3

0

–dB

00

40

30

25

90

125

150

Hz

25

50

90

125

150

Hz

25

50

20

15

10

6

3

0

–dB

00

40

30

25

+

+

6

3

4

2

1

5

2

Volume controls (CHANNEL A, B)
These knobs enable you to adjust the output level of
Channels A and B in the range between –

dB and

0 dB. In BRIDGE mode, only the volume control for
Channel A is available.

3

STEREO/BRIDGE/PARALLEL switch
This slide switch is used to set the amplifier operating
mode: STEREO, BRIDGE or PARALLEL.

STEREO

PARALLEL

BRIDGE

• STEREO mode

In this mode, channels A and B operate independently
(as a conventional stereo amp).
The CHANNEL A input signal will be output from
the CHANNEL A output jacks, and the CHANNEL B
input signal will be output from the CHANNEL B
output jacks.

• BRIDGE mode

In this mode, the CHANNEL A input signal will be
output from the BRIDGE output jacks. In this case,
use the rear panel CHANNEL A volume control to
adjust the volume.

• PARALLEL mode

In this mode, the CHANNEL A input signal will be
output from the output jacks of both channels A and
B. The CHANNEL B input jack is not used. The
CHANNEL A and B volumes can be adjusted
independently.

1

Frequency controls/Filter select switches (CHAN-
NEL A, B)
These knobs and sliding switches are used to select a
filter type and control the cut-off frequencies respec-
tively. You can select one of the following filter type:

OFF

LOW CUT

SUB WOOFER

OFF ........................ Turns the filter off.
SUB WOOFER ...... Turns the low pass filter on.

(The cut-off frequencies for
the low pass filter are fixed.)
This setting is suitable when
using the unit as an amplifier
for a subwoofer.

LOW CUT .............. Turns the high pass (low cut)

filter on. (The cut-off frequen-
cies are variable.)

If you select “LOW CUT,” you can use the frequency
controls to adjust the cut-off frequencies in the range
of 25 Hz to 150 Hz.

FREQ.

90

125

150

Hz

25

50

Note: In BRIDGE mode, only the frequency control
and filter select switch for Channel A are available.

Summary of Contents for XS250

Page 1: ...POWER AMPLIFIER XS350 XS250 Owner s Manual E POWER POWER AMPLIFIER XS SERIES POWER SIGNAL CLIP SIGNAL CLIP PROTECTION CH A CH B ON OFF 350 ...

Page 2: ...A SIGNAL indicator and CLIP indicator is provided for each channel The PROTECTION indicator shows the status of protective circuitry such as power on off protection output muting and the DC detection circuit Variable speed low noise fan s ensures high reliability even under demanding conditions This owner s manual covers the two models XS350 XS250 In order to take full advantage of your power amp ...

Page 3: ...t your dealer for repair Using the unit in this condition is a fire and electrical shock hazard Should this unit be dropped or the cabinet be damaged turn the power switch off remove the power plug from the AC outlet and contact your dealer If you continue using the unit without heeding this instruction fire or electrical shock may result Hold the power cord plug when disconnecting it from an AC o...

Page 4: ...ROTECTION indicator These LED indicators light up to indicate that the protection circuit is working The speaker system is disconnected from the amplifier outputs and no sound is output from the speakers The protection circuit is activated in the following situations When the amplifier is powered on The protection circuit is activated for approximately 3 seconds when the amplifier is powered on Af...

Page 5: ... output from the CHANNEL B output jacks BRIDGE mode In this mode the CHANNEL A input signal will be output from the BRIDGE output jacks In this case use the rear panel CHANNEL A volume control to adjust the volume PARALLEL mode In this mode the CHANNEL A input signal will be output from the output jacks of both channels A and B The CHANNEL B input jack is not used The CHANNEL A and B volumes can b...

Page 6: ...HANNEL STEREO SPEAKERS BRIDGE mode B 2 CHANNEL A 2 8 16Ω BRIDGE 4 8Ω CHANNEL STEREO B 1 CHANNEL A 1 8 16Ω BRIDGE 4 8Ω CHANNEL STEREO SPEAKERS In BRIDGE mode the jacks of CHANNELS A 1 B 1 and A 2 B 2 are not used The minimum impedance for the connected speaker system is specified in Speaker Impedance on page 7 5 INPUT terminals CHANNEL A B Two types of balanced terminals for channels A and B are pr...

Page 7: ...is specified impedance Using the barrier strip and binding posts simultanuously STEREO mode connections MODE STEREO PARALLEL BRIDGE Set to STEREO PARALLEL mode connections MODE STEREO PARALLEL BRIDGE Set to PARALLEL BRIDGE mode connections MODE STEREO PARALLEL BRIDGE Set to BRIDGE SPEAKERS Each speaker min 8Ω Each speaker min 8Ω SPEAKERS Speaker min 16Ω Speaker min 16Ω ...

Page 8: ...TEREO PARALLEL BRIDGE Set to PARALLEL SPEAKERS Using the barrier strip SPEAKERS Using the terminal posts Not used Not used Each speaker min 4Ω Each speaker min 4Ω BRIDGE mode connections MODE STEREO PARALLEL BRIDGE Set to BRIDGE SPEAKERS Using the barrier strip SPEAKERS Using the terminal posts Not used Not used Speaker min 8Ω Speaker min 8Ω ...

Page 9: ...hould not touch the chassis 4 Reattach the protective cover over the speaker terminals Speaker fuse The output capacity of your amplifier is very high 170 W 170 W 8Ω 250 W 250 W 4Ω in stereo and 500 W 8Ω in monaural on the XS250 230 W 230 W 8Ω 350 W 350 W 4Ω in stereo and 700 W 8Ω in monaural on the XS350 Be sure to use a speaker system that has sufficient input capacity If the input capacity of y...

Page 10: ...n with 1 5 m3 min or more maximum wind and 5 mmH2 O or more maximum static pressure Mounting Install the fan kit on the top slot or the top panel of the rack and install a blanking panel between two amps Example of mounting The figure on the left below shows an example of a fan kit panels and two fans on the top slot of the rack The fans are Minebia 3115PS 12T B30 with 0 9 m3 min maximum wind and ...

Page 11: ...NEL B CHANNEL A SPEAKERS CHANNEL B 70V 32Ω CHANNEL 100V 64Ω CHANNEL CHANNEL A G G OUTPUT VOLTAGE CHANNEL B CHANNEL A LOW CUT LOW CUT 40Hz 40Hz OFF OFF 80Hz 80Hz HIGH CUT HIGH CUT 5kHz 5kHz 20 15 10 6 3 70V 100V 0 dB 00 40 30 25 20 15 10 6 3 0 dB 00 40 30 25 OFF OFF 10kHz 10kHz Front Air intake Air exhaust Completely open Rear View Side View Fixed Installation Mounting Do not block the vent opening...

Page 12: ...ing BRIDGE 40 V µs Sensitivity Vol max Rated Power into 8Ω 1 7 dB 3 1 dB Voltage Gain Vol max 32 1 dB 32 1 dB Input Impedance 30 kΩ Balanced 15 kΩ Unbalanced Controls Front Panel POWER switch ON OFF Rear Panel Volume 31 position x 2 Mode switch STEREO BRIDGE PARALLEL Filter switch OFF SUBWOOFER LOW CUT x 2 12 dB oct Freq control 25 Hz 125 Hz x 2 Connectors Input Barrier strip terminal XLR 3 31 typ...

Page 13: ...LLEL BRIDGE PARALLEL BRIDGE INPUT INPUT CHANNEL B CHANNEL A CHANNEL B CHANNEL A G G INPUT B 2 A 2 CHANNEL B 1 A 1 CHANNEL SPEAKERS SIGNAL SIGNAL PROTECTION INV CHANNEL A CHANNEL B SUB WOOFER HPF LPF FREQ FREQ LPF HPF STEREO BRIDGE PARALLEL BA BA Dimensions H 132 D 319 W 480 Unit mm ...

Page 14: ...ink temperature has exceeded 90 C A DC voltage of 2 V or greater was generated in the power amplifier s output circuit Locate and correst the cause of the short Use a speaker system with an impedance of at least 4Ω stereo or 8Ω bridge Check the amplifier ventilation conditions and take appropriate measures to improve airflow around the amplifier Consult your dealer or nearest Yamaha service center...

Page 15: ...YAMAHA CORPORATION V352950 R1 1 IP 16 Pro Audio Division 18 3 P O Box 3 Hamamatsu 430 8651 Japan NP Printed in Taiwan ...

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