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:
CAUTION
RISK OF ELECTRIC SHOCK
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.
DO NOT OPEN
ATTENTION:
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.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER - SERVICEABLE PARTS INSIDE.
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.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
"WARNING"
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.
"TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE."
SAFETY INSTRUCTIONS
1. Read Instructions - All the safety and operating instructions should be
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.
read before the appliance is operated.
2. Retain Instructions - The safety and operating instructions should be
retained for future reference.
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.
3. Heed Warnings - All warnings on the appliance and in the operating
instructions should be adhered to.
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.
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.
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:
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.
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
7. Wall or Ceiling Mounting - The appliance should be mounted to a wall or
ceiling only as recommended by the manufacturer.
D. The appliance does not appear to operate normally or exhibits a
marked change in performance; or
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.
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.
PH-50 Operating Examples
Monitoring System by Cascade Connection
CUE BOX
CHANNEL IN (-10dBV)
INPUT
(+4dBu/-10dBV)
R
XLR PHONE
Unit #1
1
2
3
4
5
L
2
3
1
T
R
S
HOT
COLD
GND
L
R
+4dBu -10dBV
L
(-10dBV)
R
L
R
L/MONO
AUX IN
R
(-10dBV)
(-10dBV)
INPUT
CASCADE OUT
CUE OUT #1
CUE OUT #2
MIXER
Input Signal
MON OUT
CHANNEL IN
3
INPUT
(+4dBu/-10dBV)
R
(-10dBV)
4
Unit #2
XLR PHONE
1
2
5
L
2
3
1
T
R
S
HOT
COLD
GND
L
R
+4dBu -10dBV
L
(-10dBV)
R
L
R
L/MONO
AUX IN
R
(-10dBV)
(-10dBV)
INPUT
CASCADE OUT
AUX IN
INPUT
AUX IN
INPUT
5
5
5
5
5
5
5
5
5
5
5
5
PH-50
PH-50
HEADPHONE AMP DISTRIBUTOR
HEADPHONE AMP DISTRIBUTOR
PEAK
POWER
0
10
0
10
0
10
0
10
0
10
0
10
AUX IN
PEAK
CAL
POWER
0
10
0
10
0
10
0
10
0
10
0
10
AUX IN
1
2
3
4
5
5
1
2
3
4
5
5
CAL
0
10
INPUT
ST MONO
0
10
INPUT
ST MONO
PHONES
PHONES
CHANNEL IN
3
INPUT
(+4dBu/-10dBV)
R
(-10dBV)
4
XLR PHONE
1
2
5
Unit #3
L
2
3
1
T
R
S
HOT
COLD
GND
L
R
+4dBu -10dBV
L
(-10dBV)
R
L
R
L/MONO
AUX IN
R
(-10dBV)
(-10dBV)
INPUT
CASCADE OUT
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.
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.).
* 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
CHANNEL IN
3
INPUT
(+4dBu/-10dBV)
R
(-10dBV)
4
XLR PHONE
1
2
5
L
2
3
1
T
R
S
HOT
COLD
GND
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
MIXER
INPUT
L
R
+4dBu -10dBV
L
R
L
R
L/MONO
AUX IN
R
(-10dBV)
(-10dBV)
(-10dBV)
INPUT
CASCADE OUT
MON OUT
5
5
5
5
5
5
PH-50
HEADPHONE AMP DISTRIBUTOR
PEAK
CAL
POWER
0
10
0
10
0
10
0
10
AUX IN
0
10
0
10
1
2
3
4
5
5
0
10
INPUT
ST MONO
PHONES
Block Diagram
PEAK
OUTPUT LEVEL 1
INPUT
L
PHONES 1
PHONES 2
+4dBu/-10dB
ST/MONO
OUTPUT LEVEL 2
OUTPUT LEVEL 3
OUTPUT LEVEL 4
BALANCE IN
R
PHONES 3
PHONES 4
L
UNBAL IN
R
AUX IN
L/MONO
R
1
2
OUTPUT LEVEL 5
3
4
5
CHANNEL IN
PHONES 5
L
CASCADE OUT
R
Specifications
INPUTS/OUTPUTS
CASCADE OUTPUT
Output level: -10dBV
INPUT (Balance)
Input level: +4dBu/-10dBV (switchable)
Input impedance: 10kΩor more
Input levela-10dBV
Frequency response: 30Hz ~ 20kHz 1dB
INPUT (Unbalance)
AUX INPUT
GENERAL
Input impedance: 10kΩ or more
Input level: -10dBV
Dimensions
Weight
210 (W) x 200 (D) x 43 (H) mm
Approx. 1.9 kg
Input impedance: 10kΩ or more
Input level: -10dBV
Power supply
120VAC 60Hz
CHANNEL INPUT
PHONES OUTPUT
230V ~ 50/60Hz
Approx. 8W
Input impedance: 10kΩ or more
Maximum Output level: 500mW
Load impedance: 8~50Ω
Power consumption
* Specifications and appearance are subject to change without notice for
product improvement.
Frequency response: 30Hz ~ 20kHz 1dB
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)
<AUSTRIA>
<ITALY>
NAME: ATEC Audio-u. Videogeraete VertriebsgesmbH.
ADD: Im Winkel 5, A-2325 Velm, Austria
NAME: Recoton Italia SrL.
ADD:V. 1 Maggio, N 18, 40050 Quarto Inferiore, (BO) Italy
TEL: (+39) 51-768576, FAX: (+39) 51-768336
TEL: (+43) 2234-74004, FAX: (+43) 2234-74074
<BELGIUM>
<THE NETHERLANDS>
NAME: EML N. V.
NAME: IEMKE ROOS AUDIO B. V.
ADD: Kuiperbergweg 20, 1101 AG Amsterdam, The Netherlands
TEL: (+31) 20-697-2121
ADD: Bijvennestraat 1A, B3500 Hasselt, Belgium
TEL: (+32) 11-232355, FAX: (+32) 11-232172
FAX: (+31) 20-697-4201
<DENMARK>
NAME: SC Sound ApS
<NORWAY>
ADD: Malervej 2, DK-2630 Taastrup, Denmark
TEL: (+45) 4399-8877, FAX: (+45) 4399-8077
NAME: Siv. Ing. Benum A/S
ADD: P. O. Box 145 Vinderen, 0319 Oslo 3, Norway
TEL: (+47) 22-139900, FAX: (+47) 22-148259
<FINLAND>
NAME: Noretron Audio
<PORTUGAL>
ADD: Tonttumuorinkuja 4, FIN-02200 Espoo, Finland
TEL: (+358) 0-5259330, FAX: (+358) 0-52593352
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
<FRANCE>
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
<SPAIN>
NAME: Multitracker, S. A.
ADD: C/Garcilaso No.9, Madrid 28010, Spain
TEL: (+34) 1-4470700, 1-4470898
FAX: (+34) 1-5930716
<GERMANY>
NAME: Studiosound & Music GmbH
ADD: Scheppe Gewissegasse 8, D-35039 Marburg, Germany
TEL: (+49) 6421-12071, FAX: (+49) 6421-15522
<SWEDEN>
NAME: TTS Tal & Ton Studioteknik AB
ADD: Gelbgjutarevagen 4, S-171 48 Solna, Sweden
TEL: (+46) 8-7340750, FAX: (+46) 8-824476
<GREECE>
NAME: Bon Studio S. A.
ADD: 6 Zaimi Street, Exarchia, 106.83 Athens, Greece
TEL: (+30) 1-3809605-8, 3302059
FAX: (+30) 1-3845755
<SWITZERLAND>
NAME: Audio Bauer Pro AG
ADD: Bernerstrasse-Nord 182, CH-8064 Zurich, Switzerland
TEL: (+41) 1-4323230, FAX: (+41) 1-4326558
<ICELAND>
NAME: I. D. elrf. electronic Ltd.
ADD: Armula 38 108 Reykjavik, Iceland
TEL: (+354) 588 5010, FAX: (+354) 588 5011
<UK>
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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