Fostex Ph 50 Users Manual PH50 O/M (English)

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Headphone Amp Distributor

Model

PH-50

Owner's Manual

Thank you for purchasing our Fostex product.
The model PH-50 is a headphone distributor. It has three inputs and five high power (500mW) headphone
outputs whose output level can be separately controlled. In addition, it contains a matrix box function for
five inputs and five outputs.
For inputs to the headphone distributor, it has two balanced lines and one unbalanced line. The balanced
input level can be switched for receiving +4dBu or -10dBV levels. Also, the CUE box function can be
employed by using the AUX inputs, and the multi-channel operation by cascade connection of a multiple
number of PH-50's. Please carefully read through this manual for many years of good service.

CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN

CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.

ATTENTION:
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).

POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE LA LAME LA PLUS
LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET
POUSSER JUSQU' AU FOND.

NO USER - SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

"WARNING"
"TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE."

The lightning flash with arrowhead symbol, within an equilateral
triangle, is intended to alert the user to the presence of uninsulated
"dangerous voltage" within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.

SAFETY INSTRUCTIONS
1. Read Instructions - All the safety and operating instructions should be
read before the appliance is operated.
2. Retain Instructions - The safety and operating instructions should be
retained for future reference.
3. Heed Warnings - All warnings on the appliance and in the operating
instructions should be adhered to.
4. Follow Instructions - All operating and use instructions should be followed.
5. Water and Moisture - The appliance should not be used near water - for
example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool, and the like.
6. Carts and Stands - The appliance should be used only with a cart or
stand that is recommended by the manufacturer.

An appliance and cart combination should be moved with care. Quick
stops, excessive force, and uneven surfaces may cause the appliance
and cart combination to overturn.
7. Wall or Ceiling Mounting - The appliance should be mounted to a wall or
ceiling only as recommended by the manufacturer.
8. Ventilation - The appliance should be situated so that its location or position
dose not interfere with its proper ventilation. For example, the appliance
should not be situated on a bed, sofa, rug, or similar surface that may
block the ventilation openings; or, placed in a built-in installation, such as
a bookcase or cabinet that may impede the flow of air through the
ventilation openings.

9. Heat - The appliance should be situated away from heat sources such
as radiators, heat registers, stoves, or other appliances (including
amplifiers) that produce heat.
10. Power Sources - The appliance should be connected to a power supply
only of the type described in the operating instructions or as marked on
the appliance.
11. Grounding or Polarization - The precautions that should be taken so
that the grounding or polarization means of an appliance is not defeated.
12. Power Cord Protection - Power supply cords should be routed so that
they are not likely to be walked on or pinched by items placed upon or
against them, paying particular attention to cords at plugs, convenience
receptacles, and the point where they exit from the appliance.
13. Cleaning - The appliance should be cleaned only as recommended by
the manufacturer.
14. Nonuse Periods - The power cord of the appliance should be unplugged
from the outlet when left unused for a long period of time.
15. Object and Liquid Entry - Care should be taken so that objects do not
fall and liquids are not spilled into the enclosure through openings.
16. Damage Requiring Service - The appliance should be serviced by
qualified service personnel when:
A. The power supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the appliance; or
C. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally or exhibits a
marked change in performance; or
E. The appliance has been dropped, or the enclosure damaged.
17. Servicing - The user should not attempt to service the appliance beyond
that described in the operating instructions. All other servicing should
be referred to qualified service personnel.

Notes On Operation
1. Do not use headphones for long hours at high sound levels.
If the headphone is used under such condition, it could injure
your hearing. Also, be careful not to rapidly raise the output
control when using the headphone.
Please use good sense to protect your hearing.

2. Turn down all sound volume controls before switch on power.
Be sure to fully turn off all sound volume controls when switching
on/off power to the PH-50.

3. Retard the sound volume control when the headphone plug
is connected or disconnected from the jack.
Always turn down the sound volume control before the
headphone is plugged or unplugged to the PHONES jack. If it is
plugged or unplugged while the volume control is set too high,
it could create noise and have hurt your ears.

4. Switch off power when connecting external equipment to
PH-50.
Always switch off power to the PH-50 when connecting external
equipment to it.

Names and Functions of the Controls and Jacks
2

Front Panel
5

5

5

5

3

5

5

PH-50

1

HEADPHONE AMP DISTRIBUTOR
0

10

0

1

10

0

10

0

3

2

10

0

4

10

5

0

PEAK

10

AUX IN

ST MONO
PHONES

5

0

POWER

CAL

4

10

INPUT

7

6

5

1. Headphone output level control knob [PHONES 1 ~ 5]

5. Input master level control knob [INPUT]

For adjusting sound volume of the headphone plugged into PHONES jack

Adjusts the input signal level of equipment connected to the rear panel
balanced input connectors (XLR or PHONE) or the unbalanced input jacks.

1 ~ 5.

Standard input level is obtained when the knob is set to CAL.

2. AUX input level control knob [AUX IN]
This adjusts the input level of the external equipment connected to the
rear panel AUX IN jacks. The signal, whose level is adjusted by this knob,
is mixed with the signal whose level is adjusted by the INPUT knob and
thus output from both the PHONES jack and CASCADE OUT jack.

3. Peak LED [PEAK]

6. Input image position selector switch [ST/MONO]
Image position, of input signals from equipment connected to the rear
panel balanced input connectors (XLR or PHONE) or the unbalanced input
jacks (RCA), is selected by this switch. If switched to ST, the input signal
will be output from the PHONES output jack or the CASCADE OUT jack, in
stereo if switched to ST, or in monaural if switched to MONO.

This will light when input is overloaded.
Should this light frequently, turn down the INPUT knob.

7. Headphone jacks [PHONES 1 ~ 5]
Headphones are plugged in here. Sound volume for each are adjusted

4. Power switch [POWER]

by the headphone output level control knob located above each jack.

This switches on/off power to this equipment (LED will light at ON).
When switching on/off power to this equipment, turn down the level
control knobs on this and also on the external equipment.

Rear Panel
1

2

CHANNEL IN
3

INPUT

(-10dBV)

4

5

L

8

(+4dBu/-10dBV)

R

XLR PHONE
2
T
HOT
3
R
COLD
1
S
GND

L

L (-10dBV) R
CASCADE OUT

13

L

(-10dBV)

INPUT

R

L/MONO
AUX IN

12

R

+4dBu

R

9

-10dBV

(-10dBV)

11

10

8. Channel input jacks [CHANNEL IN 1 ~ 5] (RCA: -10dBV)

11. AUX input jack [AUX IN] (RCA: -10dBV)

These jacks are used to directly assign external signals (monaural) to
each headphone output. Signal input to these jacks will not be affected

This is a spare input jack. For an external equipment of monaural output,

by the INPUT knob.

it must be connected to L/MONO (the same signal will also be applied to
R). Signals input here are adjusted in level by the AUX IN knob.

9. Balanced input connector [INPUT] (XLR, PHONE: -10dBV/+4dBu)

12. Unbalanced input jack [INPUT] (RCA: -10dBV)

The balanced line is connected here. Two types of connectors XLR-3-31
and PHONE - are provided. Input level is adjusted with the INPUT knob

Unbalanced outputs are connected here. In the same way as for balanced
inputs, the input level is adjusted with the INPUT knob. When making a

and the +4dBu/-10dBV switch is set to match the output level of the
equipment connected here.

cascade connection, this is connected to CASCADE OUT of the other PH50.

10. Balanced input level selector switch [+4dBu/-10dBV]

13. Cascade output jack [CASCADE OUT] (RCA: -10dBV)

When using the balanced input, this is switched to match the output
level of the equipment that is connected. The input level can be selected

When using PH-50 in the cascade connection, this jack is connected to
the unbalanced input jack of the next PH-50. This output can also be

for -10dBV or +4dBu.

used for recording by applying it to the INPUT of a recorder.

PH-50 Operating Examples
Monitoring System by Cascade Connection
1

2

CHANNEL IN
3

INPUT

(-10dBV)

4

5

(+4dBu/-10dBV)

L

XLR PHONE
HOT
2
T
COLD
3
R
GND
1
S

R

L

L (-10dBV) R
CASCADE OUT

L

R

(-10dBV)

L/MONO
AUX IN

INPUT

R

+4dBu

CUE BOX

Unit #1

R

-10dBV

CUE OUT #1

(-10dBV)

CUE OUT #2

MIXER

Input Signal
MON OUT
1

2

CHANNEL IN
3

INPUT

(-10dBV)

4

5

L

(+4dBu/-10dBV)
XLR PHONE
2
T
HOT
3
R
COLD
1
S
GND

R

L

L (-10dBV) R
CASCADE OUT

L

(-10dBV)

R

L/MONO
AUX IN

INPUT

R

+4dBu

Unit #2

R

-10dBV

(-10dBV)

AUX IN
5

5

5

INPUT

INPUT

5

5

5

5

5

5

AUX IN

5

5

5

PH-50

PH-50

HEADPHONE AMP DISTRIBUTOR
0

10

1

0

10

2

0

10

3

0

10

4

0

0

10

5

PEAK

10

AUX IN

5

0

ST MONO
PHONES

1

2

CHANNEL IN
3

INPUT

(-10dBV)

4

5

L

(+4dBu/-10dBV)

R

XLR PHONE
2
T
HOT
3
R
COLD
1
S
GND

L

L (-10dBV) R
CASCADE OUT

L

(-10dBV)

INPUT

R

L/MONO
AUX IN

R

+4dBu

HEADPHONE AMP DISTRIBUTOR

POWER

0

10

0

1

CAL

10

0

10

3

2

0

10

0

4

10

5

0

PEAK

10

AUX IN

10

5

ST MONO

INPUT

PHONES

0

POWER

CAL

10

INPUT

Unit #3

R

-10dBV

(-10dBV)

To INPUT jack (unbalance)

A system for monitoring a single stereo source to the PHONES
OUT up to a maximum of 50 persons. CASCADE OUT of Unit
#1 is connected to INPUT (unbalance) of Unit #2, and so
forth from Unit #3. If the INPUT knob of Unit #2 and later
units are set to CAL, the output level of all headphones can
be changed simultaneously by simply adjusting the INPUT
knob of Unit #1 (Cascade connection must be limited to a
maximum 10 units. Fostex cannot guarantee correct
operation if this number is exceeded.).

This is a system for locating a PH-50 in each musician's booth,
in which each musician can adjust the monitor balance to
their preference during recording sessions. A monitor send
exclusive for each musician is connected to AUX IN and
monitor signals other than this is returned to the INPUT.
Each musician can thus set balance of the two monitor mix
by adjusting the AUX and INPUT knobs of the PH-50.
* The PH-50 can also be rack mounted by utilizing the
separately sold rack mount adaptor. The ROLAND CO., Model
RAD-50 adaptor is recommended.

Recording Studio
During multitrack recording,
a system can be made for
sending the monitor signal
from the MIXER to the
musician's headphones and
at the same time, send them
talkback individually from
the MIXER.

CUE OUT

1

CHANNEL IN
3

2

INPUT

(-10dBV)

4

5

(+4dBu/-10dBV)

L

XLR PHONE
HOT
2
T
COLD
3
R
GND
1
S

R

L

L (-10dBV) R
CASCADE OUT

MIXER

L

R

(-10dBV)

L/MONO
AUX IN

INPUT

R

+4dBu

R

-10dBV

(-10dBV)

MON OUT
5

5

5

5

5

5

PH-50

INPUT

HEADPHONE AMP DISTRIBUTOR
0

10

1

0

10

2

0

10

3

0

10

0

4

10

5

0

ST MONO
PHONES

PEAK

10

AUX IN

5

0

POWER

CAL

10

INPUT

Block Diagram
INPUT

PEAK

OUTPUT LEVEL 1

L
PHONES 1
+4dBu/-10dB

ST/MONO
OUTPUT LEVEL 2

BALANCE IN
R

PHONES 2
OUTPUT LEVEL 3

PHONES 3

L
UNBAL IN

R
AUX IN

OUTPUT LEVEL 4

L/MONO
R
1

PHONES 4
OUTPUT LEVEL 5

2
CHANNEL IN 3
4

PHONES 5

5
L
CASCADE OUT
R

Specifications
INPUTS/OUTPUTS
INPUT (Balance)
INPUT (Unbalance)
AUX INPUT
CHANNEL INPUT
PHONES OUTPUT

CASCADE OUTPUT
Input level: +4dBu/-10dBV (switchable)
Input impedance: 10kΩor more
Input levela-10dBV
Input impedance: 10kΩ or more
Input level: -10dBV
Input impedance: 10kΩ or more
Input level: -10dBV
Input impedance: 10kΩ or more
Maximum Output level: 500mW
Load impedance: 8~50Ω
Frequency response: 30Hz ~ 20kHz ±1dB

Output level: -10dBV
Frequency response: 30Hz ~ 20kHz±1dB

GENERAL
Dimensions
Weight
Power supply
Power consumption

210 (W) x 200 (D) x 43 (H) mm
Approx. 1.9 kg
120VAC 60Hz
230V ~ 50/60Hz
Approx. 8W

* Specifications and appearance are subject to change without notice for
product improvement.

Declaration of EC Directive
This equipment is compatible with the EMC Directive (89/336/EEC) - Directive on approximation of member nation's ordinance concerning
the electromagnetic compatibility and with the Low Voltage Directive (73/23/EEC) - Directive on approximation of member nation's
ordinance concerning electric equipment designed to be used within the specified voltage range.

The Affect of Immunity on This Equipment
The affect of the European specification EN50082-1 (coexistence of electromagnetic waves - common immunity specification) on this
equipment are as shown below.
* In the electrical fast transient / burst requirements, radiated electromagnetic field requirements and static electricity discharging
environment, this could be affected by generation of noise and distortion in some cases.

FOSTEX DISTRIBUTORS LIST IN EUROPE

* Including non - EU countries. * underlined: contracted distributors (as of November, 1997)





NAME: ATEC Audio-u. Videogeraete VertriebsgesmbH.
ADD: Im Winkel 5, A-2325 Velm, Austria
TEL: (+43) 2234-74004, FAX: (+43) 2234-74074

NAME: Recoton Italia SrL.
ADD:V. 1 Maggio, N 18, 40050 Quarto Inferiore, (BO) Italy
TEL: (+39) 51-768576, FAX: (+39) 51-768336





NAME: EML N. V.
ADD: Bijvennestraat 1A, B3500 Hasselt, Belgium
TEL: (+32) 11-232355, FAX: (+32) 11-232172

NAME: IEMKE ROOS AUDIO B. V.
ADD: Kuiperbergweg 20, 1101 AG Amsterdam, The Netherlands
TEL: (+31) 20-697-2121
FAX: (+31) 20-697-4201


NAME: SC Sound ApS
ADD: Malervej 2, DK-2630 Taastrup, Denmark
TEL: (+45) 4399-8877, FAX: (+45) 4399-8077


NAME: Noretron Audio
ADD: Tonttumuorinkuja 4, FIN-02200 Espoo, Finland
TEL: (+358) 0-5259330, FAX: (+358) 0-52593352


NAME: Musikengro
ADD: ZAC de Folliouses, B. P. 609, 01706 Les Echets, France
TEL: (+33) 72 26 27 00, FAX: (+33) 72 26 27 01


NAME: Studiosound & Music GmbH
ADD: Scheppe Gewissegasse 8, D-35039 Marburg, Germany
TEL: (+49) 6421-12071, FAX: (+49) 6421-15522


NAME: Bon Studio S. A.
ADD: 6 Zaimi Street, Exarchia, 106.83 Athens, Greece
TEL: (+30) 1-3809605-8, 3302059
FAX: (+30) 1-3845755


NAME: I. D. elrf. electronic Ltd.
ADD: Armula 38 108 Reykjavik, Iceland
TEL: (+354) 588 5010, FAX: (+354) 588 5011


NAME: Siv. Ing. Benum A/S
ADD: P. O. Box 145 Vinderen, 0319 Oslo 3, Norway
TEL: (+47) 22-139900, FAX: (+47) 22-148259


NAME: Caius - Tecnologias Audio e Musica, Lda.
ADD: Rua de Santa Catarina, 131 4000 Porto, Portugal
TEL: (+351) 2-2084456/325400
FAX: (+351) 2-314760


NAME: Multitracker, S. A.
ADD: C/Garcilaso No.9, Madrid 28010, Spain
TEL: (+34) 1-4470700, 1-4470898
FAX: (+34) 1-5930716


NAME: TTS Tal & Ton Studioteknik AB
ADD: Gelbgjutarevagen 4, S-171 48 Solna, Sweden
TEL: (+46) 8-7340750, FAX: (+46) 8-824476


NAME: Audio Bauer Pro AG
ADD: Bernerstrasse-Nord 182, CH-8064 Zurich, Switzerland
TEL: (+41) 1-4323230, FAX: (+41) 1-4326558


NAME: SCV London
ADD: 3A 6-24 Southgate Road, London N1 3JJ, England, UK
TEL: (+44) 171-923-1892, FAX: (+44) 171-241-3644

FOSTEX CORPORATION
3-2-35 Musashino, Akishima-shi, Tokyo, Japan 196-0021

FOSTEX CORPORATION OF AMERICA
15431, Blackburn Ave., Norwalk, CA 90650, U. S. A.
C

PRINTED IN JAPAN AUG. 1996 8288 384 000 FX



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Subject                         : PH50 O/M (English)
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Title                           : PH50 O/M (English)
Modify Date                     : 1999:08:06 16:16:59
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