Tascam Headphones MH 8 User Manual

IMPORTANT SAFETY INSTRUCTIONS  
1 Read these instructions.  
2 Keep these instructions.  
3 Heed all warnings.  
Do not expose this apparatus to drips or splashes.  
Do not place any objects filled with liquids, such  
as vases, on the apparatus.  
Do not install this apparatus in a confined space  
such as a book case or similar unit.  
4 Follow all instructions.  
The apparatus draws nominal non-operating  
power from the AC outlet with its POWER or  
STANDBY/ON switch not in the ON position.  
5 Do not use this apparatus near water.  
6 Clean only with dry cloth.  
The apparatus should be located close enough  
to the AC outlet so that you can easily grasp the  
power cord plug at any time.  
7 Do not block any ventilation openings. Install in  
accordance with the manufacturer's instructions.  
8 Do not install near any heat sources such  
as radiators, heat registers, stoves, or other  
apparatus (including amplifiers) that produce  
heat.  
The mains plug is used as the disconnect device,  
the disconnect device shall remain readily  
operable.  
Products with Class I construction are equipped  
with a power supply cord that has a 3-prong  
grounding plug. The cord of such a product must  
be plugged into an AC outlet that has a protective  
grounding connection.  
9 Do not defeat the safety purpose of the polarized  
or grounding-type plug. A polarized plug has two  
blades with one wider than the other. A grounding  
type plug has two blades and a third grounding  
prong. The wide blade or the third prong are  
provided for your safety. If the provided plug does  
not fit into your outlet, consult an electrician for  
replacement of the obsolete outlet.  
If the product uses batteries (including a battery  
pack or installed batteries), they should not be  
exposed to sunshine, fire or excessive heat.  
CAUTION for products that use replaceable lithium  
batteries: there is danger of explosion if a battery  
is replaced with an incorrect type of battery.  
Replace only with the same or equivalent type.  
10 Protect the power cord from being walked on  
or pinched particularly at plugs, convenience  
receptacles, and the point where they exit from  
the apparatus.  
Caution should be taken when using earphones or  
headphones with the product because excessive  
sound pressure (volume) from earphones or head-  
phones can cause hearing loss.  
11 Only use attachments/accessories specified by  
the manufacturer.  
12 Use only with the cart, stand, tripod, bracket, or  
table specified by the manufacturer, or sold with  
the apparatus. When a cart is used, use caution  
when moving the cart/apparatus combination to  
avoid injury from tip-over.  
If you are experiencing problems with this product,  
contact TEAC for a service referral. Do not use the  
product until it has been repaired.  
RACK-MOUNTING THE UNIT  
ª
Use the supplied rack-mounting kit to mount the unit in a  
standard 19-inch rack, as shown below.  
Remove the feet of the unit before mounting.  
13 Unplug this apparatus during lightning storms or  
when unused for long periods of time.  
14 Refer all servicing to qualified service personnel.  
Servicing is required when the apparatus has  
been damaged in any way, such as power-supply  
cord or plug is damaged, liquid has been spilled  
or objects have fallen into the apparatus, the  
apparatus has been exposed to rain or moisture,  
does not operate normally, or has been dropped.  
NOTE  
Leave 1U of space above the unit for ventilation.  
Allow at least 10 cm (4 in) at the rear of the unit for  
ventilation.  
TASCAM MH-8  
3
Download from Www.Somanuals.com. All Manuals Search And Download.  
1 − Introduction  
Thank you for your purchase of the TASCAM MH-8  
Headphone Amplifier.  
NOTE  
Explanation of actions in special situation and  
supplement.  
Before connecting and using the unit, please take time  
to read this manual thoroughly to ensure you understand  
how to properly set up and connect the unit, as well as the  
operation of its many useful and convenient functions. After  
you have finished reading this manual, please keep it in a  
safe place for future reference.  
CAUTION  
Instructions that should be followed to avoid injury,  
damage to the unit or other equipment.  
You can also download the Owner's Manual from the  
TASCAM web site (http://www.tascam.com).  
Trademarks  
TASCAM is a trademark of TEAC Corporation, regis-  
tered in the U.S. and other countries.  
Features  
Rack-mountable 1U size  
Other company names, product names and logos in this  
document are the trademarks or registered trademarks of  
their respective owners.  
8 headphone outputs  
Maximum output of 250 mW + 250 mW (at 32Ω)  
2 pairs of inputs  
Precautions and notes for placement  
and use  
INPUT 1 on XLR connectors or TRS phone jack inputs  
INPUT 2 on XLR connectors or RCA pin jack inputs  
Each headphone output channel also has direct inputs  
The operating temperature should be between 5°C and  
35°C (41°F and 95°F).  
Make sure that the unit is mounted in a level position for  
correct operation.  
Every input and output channel has an overload indica-  
tor and a signal indicator  
Do not place any object on the unit for heat dissipation.  
Avoid installing this unit on top of any heat-generating  
electrical device such as a power amplifier.  
Ground lift switch allows signal grounding to be turned  
ON or OFF for all channels at the same time  
Cleaning the unit  
Included items  
To clean the unit, wipe it gently with a soft dry cloth. Do  
not wipe with chemical cleaning cloths, benzene, paint  
thinner, ethyl alcohol or other chemical agents to clean the  
unit as they could damage the surface.  
The included items are listed below.  
Take care when opening the package not to damage the  
items. Keep the package materials for transportation in the  
future.  
Please contact the store where you purchased this unit if  
any of these items are missing or have been damaged dur-  
ing transportation.  
Main unit (MH-8)............................................................1  
Power cord.......................................................................1  
A rack-mounting screw kit..............................................1  
A warranty card ..............................................................1  
Owner's manual (this manual) ........................................1  
About this manual  
In this manual, we use the following conventions:  
The names of keys and controls are given in the follow-  
ing typeface: POWER.  
Additional information is introduced in the styles below  
when needed:  
TASCAM MH-8  
4
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
2 − Names and Functions of Parts  
Front panel  
POWER switch and indicator  
11  
Press to turn power ON or OFF. The indicator lights  
when the power is ON.  
Overload (OL) indicators  
21  
These light if the level input to this device is too high  
(overloading with a clipping level of –3 dB or higher).  
Signal (SIG) indicators  
31  
These light when a signal (–20 dBu or greater) is  
detected at an input jack.  
Input LEVEL knobs  
41  
Use to adjust the input levels.  
INPUT 1 and 2 activation buttons  
51  
Select which of the two inputs (INPUT 1 or 2) to output  
to the headphones.  
Overload (OL) indicators  
61  
These light if the level input to the channel is too high  
(overloading with a clipping level of –3 dB or higher).  
Signal (SIG) indicators  
71  
These light when a signal (–20 dBu or greater) is  
detected at a direct input for the channel.  
DIR buttons  
81  
Press to output the signal from the corresponding  
DIRECT INPUTS to the headphones.  
MONO buttons  
91  
Make the headphone output function as a monaural  
output.  
0 PHONES jacks  
Connect headphones.  
q PHONES knobs  
Adjust the headphones output levels.  
TASCAM MH-8  
5
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
2 − Names and Functions of Parts  
Rear panel  
w DIRECT INPUT jacks  
o1Power connector  
These direct input connectors provide direct line inputs  
for each channel.  
Use the included power cord to connect the power  
source.  
e1FOLDBACK output connectors  
These output the input signals (INPUT 1 and 2)  
unchanged.  
CAUTION  
When using this unit, always use the included power  
cord. Moreover, do not use the included power cord  
with any other equipment. Misuse of a power cord could  
cause malfunction, fire or electric shock.  
NOTE  
When input is through INPUT 2’s unbalanced RCA pin  
jacks, the nominal output level is converted to balanced  
+4 dBu.  
p1Ground lift (GND LIFT) switch  
Even when the ground connector is used to ground the  
unit, this ground connection can be interrupted (ground  
lift) by setting the GND LIFT switch to the left.  
r1INPUT 2 XLR connectors  
These XLR connectors are balanced line inputs for  
INPUT 2.  
(1: GND, 2: HOT, 3: COLD)  
t1INPUT 2 RCA jacks  
These RCA pin jacks are unbalanced line inputs for  
INPUT 2.  
NOTE  
Signals should not be input to both the XLR and the RCA  
connectors at the same time. Use either the XLR or the  
RCA connectors for input.  
y1INPUT 1 XLR connectors  
These XLR connectors are balanced line inputs for  
INPUT 1.  
u1INPUT 1 TRS jacks  
These TRS jacks are balanced line inputs for INPUT 1.  
NOTE  
Signals should not be input to both the XLR and the TRS  
connectors at the same time. Use either the XLR or the  
TRS connectors for input.  
i1Signal ground (SIGNAL GND) connector  
Use a commercially available PVC-covered cord to  
connect this connector to the signal ground. Note that  
this is NOT an electrical safety ground (earth).  
TASCAM MH-8  
6
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
3 – Troubleshooting  
If you are having trouble with the operation of this unit,  
please try the following before seeking repair. If these  
measures do not solve the problem, please contact the store  
where you bought the unit or a TASCAM Service Center.  
Power will not turn ON.  
ª
Confirm that the power plug is securely inserted.  
No sound is output.  
ª
Are the headphones connected correctly?  
Are the input sources connected correctly?  
Are the input selections correct?  
Are the input LEVEL knobs minimized?  
Are the headphone output (PHONES) knobs minimized?  
There is noise.  
ª
Check the connecting cables for incomplete connec-  
tions.  
TASCAM MH-8  
7
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
4 – Specifications  
Audio inputs and outputs  
Audio performance  
INPUT 1 and 2  
Frequency response  
20 Hz - 50 kHz/100 mW 32Ω,  
±3 dB (PHONES outputs)  
Connector  
XLR-3-31  
(1: GND, 2: HOT, 3: COLD)  
10 Hz - 100 kHz, ±3 dB  
(FOLDBACK outputs)  
Input impedance  
56 kΩ  
S/N ratio  
85 dB or greater (PHONES  
outputs, A-WTD, 20 kHz LPF)  
Nominal input level  
Maximum input level  
+4 dBu (1.23 V)  
+24 dBu (12.3 V)  
90 dB or greater (FOLDBACK  
outputs, A-WTD, 20 kHz LPF)  
INPUT 1  
THD  
0.05% or less (PHONES outputs,  
when outputting 100 mW + 100  
mW (32 Ω), 20Hz HPF and 20  
kHz LPF)  
Connectors  
6.3 mm (1/4”) TRS Standard  
phone jacks  
(Tip: HOT, Ring: COLD, Sleeve:  
GND)  
0.007% or less (FOLDBACK  
outputs, 20 Hz HPF and 20 kHz  
LPF)  
Input impedance  
56 kΩ  
Nominal input level  
Maximum input level  
+4 dBu (1.23 V)  
+24 dBu (12.3 V)  
Channel separation  
50 dB or greater (Within a  
channel, PHONES outputs,  
A-WTD, 20 kHz LPF,1 kHz  
nominal input, 32Ω termination)  
INPUT 2  
Connectors  
RCA pin jacks  
22 kΩ  
90 dB or greater (FOLDBACK  
outputs, A-WTD, 20 kHz LPF,  
1 kHz nominal input, 600Ω  
termination)  
Input impedance  
Nominal input level  
Maximum input level  
–10 dBV (0.3 V)  
+10 dBV (3.16 V)  
Crosstalk  
65 dB or greater (PHONES  
outputs, A-WTD, 20 kHz LPF,  
1 kHz nominal input, 32Ω  
termination)  
DIRECT INPUT  
Connectors  
6.3 mm (1/4”) TRS Standard  
phone jacks  
(Tip: HOT, Ring: COLD, Sleeve:  
GND)  
Power  
AC 100-240V, 50-60 Hz  
36 W  
Power consumption  
Dimensions (mm)  
Input impedance  
56 kΩ  
482 (width) x 44 (height) x 280  
(depth)  
Nominal input level  
Maximum input level  
+4 dBu (1.23 V)  
+24 dBu (12.3 V)  
Weight  
3.8 kg  
FOLDBACK outputs  
Connectors  
6.3 mm (1/4”) TRS Standard  
phone jacks  
(Tip: HOT, Ring: COLD, Sleeve:  
GND)  
Output impedance  
94Ω  
Nominal output level  
+4 dBu (1.23 V)  
Maximum output level +24 dBu (12.3 V)  
PHONES outputs  
Connectors  
6.3 mm (1/4”) Standard  
stereo phone jacks  
Maximum output  
250 mW + 250 mW (32Ω)  
TASCAM MH-8  
8
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
4 – Specifications  
Dimensional drawings  
41.1 mm  
432.6 mm  
44 mm  
434.2 mm  
482.6 mm  
0.9 mm  
465 mm  
Illustrations and other depictions may differ in part from the actual product.  
Specifications and external appearance may be changed without notification to improve the product.  
TASCAM MH-8  
9
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
4 – Specifications  
Block diagram  
INPUTS 2 R  
INPUTS 2 L  
INPUTS 1 R  
INPUTS 1 L  
INPUTS 2 R  
INPUTS 2 L  
INPUTS 1 R  
INPUTS 1 L  
TASCAM MH-8  
10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
4 – Specifications  
Level diagram  
TASCAM MH-8  
11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
MH-8  
TEAC CORPORATION  
Phone: +81-42-356-9143  
1-47 Ochiai, Tama-shi, Tokyo 206-8530, Japan  
TEAC AMERICA, INC.  
Phone: +1-323-726-0303  
7733 Telegraph Road, Montebello, California 90640 USA  
TEAC CANADA LTD.  
Phone: +1905-890-8008 Facsimile: +1905-890-9888  
5939 Wallace Street, Mississauga, Ontario L4Z 1Z8, Canada  
TEAC MEXICO, S.A. de C.V.  
Phone: +52-55-5010-6000  
Río Churubusco 364, Colonia Del Carmen, Delegación Coyoacán, CP 04100, México DF, México  
TEAC UK LIMITED  
Phone: +44-8451-302511  
Suites 19 & 20, Building 6, Croxley Green Business Park, Hatters Lane, Watford, Hertfordshire, WD18 8TE, UK  
TEAC EUROPE GmbH  
Phone: +49-611-71580  
Bahnstrasse 12, 65205 Wiesbaden-Erbenheim, Germany  
Printed in China  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Team Products Food Warmer USB103 User Manual
Technics Speaker SB LB910 User Manual
Tektronix Work Light THS710A User Manual
Texas Instruments Network Card TLV320AIC3107EVM K User Manual
TOA Electronics Speaker F 2322C2 User Manual
Toshiba Computer Drive MK1011GAV User Manual
Toshiba Computer Drive SD R2212 User Manual
Toshiba TV DVD Combo 26HLV66 User Manual
Verona Appliance Trim Kit VEGCT424F User Manual
ViewSonic Computer Monitor VA703M User Manual