Crate Amplifiers Stereo Amplifier SM5 HP User Manual

User’s Guide  
for the  
CRATE PRO AUDIO  
SM5-HP  
Five Channel Headphone Amplifier  
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SM5-HP Five Channel Headphone Amplifier  
Table of Contents  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
A Description of the SM5-HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Connecting the AC Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Applications  
Connecting to a Stereo Headphone Jack . . . . . . . . . . . . . . . . . . .6  
Connecting to the Stereo Outputs of a Recorder . . . . . . . . . . . . .6  
Connecting to a Mono Monitor Jack . . . . . . . . . . . . . . . . . . . . . .7  
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .back cover  
ATTENTION  
RISQUE D'ELECTROCUTION  
NE PAS OUVRIR  
VORSICHT  
ELEKTRISCHE SCHLAGGEFAHR  
NICHT OFFENEN  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
ATTENTION: POUR REDUIRE D'ELECTRO-  
CUTION NE PAS  
VORSICHT: ZUR MINIMIERUNG ELEK-  
TRISCHER SCHLAGGEFAHR NICHT  
DEN DECKEL ABENHMEN. INTERNE TEILE  
KONNEN NICHT VOM  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,  
DO NOT REMOVE COVER.  
ENLEVER LE COUVERCLE. AUCUNE PIECE  
INTERNE N'EST REPRABLE  
NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
PAR L'UTILISATEUR. POUR TOUTE REPA-  
RATION, S'ADRESSER A UN  
BENUTZER GEWARTET WERDEN. DIE  
WARTUNG IS QUALIFIZIERTEM  
TECHNICIEN QUALIFIE.  
WARTUNGSPERSONAL ZU UBERLASSEN.  
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE  
OF THE UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS.  
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.  
WARNING: AVOID PROLONGED EXPOSURE OF THE EQUIPMENT TO EXTREME HEAT.  
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
EXPLANATION OF GRAPHICAL SYMBOLS:  
"DANGEROUS VOLTAGE"  
"DANGER HAUTE TENSION"  
"GEFAHLICHE SPANNUNG"  
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"  
"REFERREZ-VOUS AU MANUAL D'UTILISATION"  
"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"  
=
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SM5-HP Five Channel Headphone Amplifier  
Introduction:  
Thank you for selecting the Crate SM5-HP five channel headphones amplifier. This  
compact device has been designed with the audio professional in mind, providing  
accuracy, quality, ease of use and straight-forward design. Manufactured in the United  
States, using only the finest componenets, the SM5-HP takes up only one-third of a sin-  
gle rack space!  
In order to achieve maximum performance from your SM5-HP and to better under-  
stand its applications, please read this user’s guide prior to its use.  
And “Thank You” from  
A Description of the SM5-HP:  
The SM5-HP allows you to distribute a single source – the headphones output of a  
mixer, the line outs of a recorder, the monitor output of a sound board, etc. – to up to  
five separate pairs of stereo headphones, each with its independent level control, with-  
out degradation of signal quality or interference between phones.  
HEAD  
PHONES  
TO  
INPUT  
3
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SM5-HP Five Channel Headphone Amplifier  
The Front Panel:  
1 2  
1. Headphone Output Jack: Each channel of the SM5-HP has a stereo (T/R/S) 1/4” jack for con-  
necting to a pair of stereo headphones. The signal level at each jack is determined by the setting  
of that channel’s output level control (#2), as well as the level of the input signal.  
2. Output Level Control: Each channel of the SM5-HP has its own output level control. Each  
channel operates independently from the others – an adjustment to the level on one channel will  
not alter the level of any of the other channels. Please see “Muting Feature Note” on page 5.  
The Rear Panel:  
LEFT  
RIGHT  
(STEREO)  
(MONO)  
9-10 VAC  
50-60 Hz  
500mA MINIMUM  
3
4
5
6
3. Power Supply Jack: Plug the small metal barrel connector of the AC power adapter here.  
4. Cord Cinch: Use this clip to secure the cable of the power pack to the chassis of the SM5-HP.  
5. Left (Stereo) Jack: This stereo (T/R/S) 1/4” jack feeds a stereo signal (such as from a  
Headphones Output jack) or the left channel of a stereo signal (such as from a tape deck line out)  
into the SM5-HP (see page 6).  
6. Right (Mono) Jack: This mono (T/S) 1/4” jack feeds a mono signal (such as from a Monitor  
Output jack) or the right channel of a stereo signal (such as from a tape deck line out) into the  
SM5-HP (See page 6, 7).  
4
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SM5-HP Five Channel Headphone Amplifier  
Connecting the AC Power Supply:  
A
LEFT  
RIGHT  
(MONO)  
C
(STEREO)  
9-10 VAC  
50-60 Hz  
500mA MINIMUM  
9-10 VAC  
50-60 Hz  
500mA MINIMUM  
B
A) Slide the power adapter cable into the cord cinch as shown above, leaving a few inches  
of cable between the cinch and the cable’s small metal barrel connector.  
B) Plug the barrel connector into the power supply jack.  
C) After all other connections are made, plug the power pack into a suitable source of AC  
line voltage. (See the sticker on the power adapter for voltage requirements.)  
NOTE: Since the SM5-HP is “always on” when the power pack is plugged in to a  
live outlet, it is advised that you unplug the power pack (or turn off the AC source)  
when not using the unit for extended time periods.  
Muting Feature Note: The SM5-HP incorporates a muting circuit which can  
silence an output jack whenever its level control is at or very near the fully  
counter clockwise position. A soft “click” will be heard through the headphones  
when the muting circuit is engaged.  
5
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SM5-HP Five Channel Headphone Amplifier  
Applications:  
Connecting to a  
Stereo Headphone Jack  
T
H
G
I
R
(MONO
LEFT  
T
F
(STEREO)  
E
L
(STERE
Connect the  
Headphones output  
jack of a mixing board  
(or other source) to the  
Left/Stereo jack of the  
SM5-HP using a  
shielded stereo (T/R/S)  
1/4” signal cable.  
HEADPHONES  
Applications:  
Connecting to the Stereo  
Outputs of a Recorder  
T
RIGHT  
H )  
G O  
I
N
R O  
M
(
Connect the left and  
right Line Out jacks of  
a recorder (or other  
source) to the Left and  
Right jacks of the  
SM5-HP using shield-  
ed RCA cables and  
RCA-to-1/4” (mono)  
adapters.  
LEFT  
T
T
F
)
E EO  
LER  
S
(
R
LINLE OUT  
6
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SM5-HP Five Channel Headphone Amplifier  
Applications:  
Connecting to a  
Mono Monitor Jack:  
RIGHT  
(MONO)  
)
O
N
RIOGHT  
(M  
Connect the Monitor  
output jack of a mix-  
ing board (or other  
source) to the  
)
LEFT  
(STERE
Right/Mono jack of  
the SM5-HP using a  
shielded mono (T/S)  
1/4” signal cable. The  
signal at the head-  
phones will be mono,  
with the same signal  
on both sides of the  
phones.  
MONITOR OUT  
7
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SM5-HP Five Channel Headphone Amplifier  
Technical Specifications:  
Power Output, 1–5 channels driven  
32 ohms 570mW  
50 ohms 400mW  
100 ohms 200mW  
200 ohms 100mW  
300 ohms 67mW  
600 ohms 34mW  
Maximum Gain  
12dB  
Frequency Response  
THD + Noise  
8Hz – 50kHz  
.09% @ 200 ohms (100mW)  
Signal to Noise Ratio  
Power Supply Requirements  
Size and Weight  
-90dB @ 200 ohms (100mW, 1kHz)  
9–10VAC, 500mA  
1.6” H x 5.6” W x 5.5” D; 1.5 lbs (without power adapter)  
Specifications subject to change without notice.  
©1999 SLM Electronics, Inc. • A Division of St. Louis Music, Inc.  
1400 Ferguson Avenue • St. Louis, MO 63133  
47-839-05 • 01/99  
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