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SAFETY RELATED SYMBOLS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Protective Grounding

 

Make sure to connect the protective grounding to prevent any 
electric shock before turning ON the apparatus.

Never cut off the internal or external protective grounding wire 
or disconnect the wiring of protective grounding terminal. 

The symbol is used to indicate that some hazard-
ous live terminals are involved within this apparatus, 
even under the normal operating conditions.

The symbol is used in the service documentation 

to indicate that a specific component shall be only 
replaced by the component specified in that docu-
mentation for safety reasons.

Protective grounding terminal.

Alternating current /voltage.

Hazardous live terminal.

ON:

  Denotes the apparatus is turned on.

OFF:

  Denotes the apparatus is turned off, because it uses 

the single pole switch, be sure to unplug the AC power to 
prevent any electric shock before you proceed with your 
service.

WARNING:

  Describes precautions that should be 

observed to prevent the danger of injury or death to 
the user.

CAUTION:

  Describes precautions that should be 

observed to prevent danger of the apparatus.

WARNING

Power Supply

 

Ensures the source voltage matches the voltage of the 
power supply before turning ON the apparatus.
Unplug this apparatus during lightning storms or when
unused for long periods of time.

External Connection

 

The external wiring connected to the output hazardous live 
terminals requires installation by an instructed person, or the 
use of ready-made leads or cords.

Do not Remove any Cover

 

There are maybe some areas with high voltages inside, 
to reduce the risk of electric shock, do not remove any 
cover if the power supply is connected. 
The cover should be removed by qualified personnel 
only. 
No user serviceable parts inside.

Fuse

 

To prevent a fire, make sure to use fuses with specified stan-
dard (current, voltage, type). Do not use a different fuse or 
short circuit the fuse holder. 
Before replacing the fuse, turn OFF the apparatus and dis-
connect the power source.

Operating Conditions 

This apparatus shall not be exposed to dripping or spl-
ashing and that no objects filled with liquids, such as 
vases, shall be placed on this apparatus.
To reduce the risk of fire or electric shock, do not expose 
this apparatus to rain or moisture. 
Do not use this apparatus near water.
Install in accordance with the manufacturer's instructions. 
Do not install near any heat sources such as radiators, 

heat registers, stoves, or other apparatus (including amp-

lifiers) that produce heat.
Do not block any ventilation openings. 
No naked flame sources, such as lighted candles, should 
be placed on the apparatus.

IMPORTANT SAFETY INSTRUCTIONS 

Read these instructions.

Heed all warnings.

Follow all instructions.

Keep these instructions.

Only use attachments/accessories specified by the manu-

facturer.

Power Cord and Plug

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.
Protect the power cord from being walked on or pinched 
particularly at the plug, convenience receptacles, and 
the point where they exit from the apparatus.

Cleaning 

When the apparatus needs a cleaning, you can blow off 
dust from the apparatus with a blower or clean with a rag 
etc. Don't use solvents such as benzol, alcohol, or other 
fluids with very strong volatility and flammability for cleaning 
the apparatus body. 
Clean only with a dry cloth.

Servicing

Refer all servicing to qualified personnel. To reduce the 
risk of electric shock, do not perform any servicing other 
than that contained in the operating instructions unless 
you are qualified to do so.
Servicing is required when the apparatus has been dam-
aged in any way, such as the 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.

Содержание BK 2.0

Страница 1: ...BK 2 0 User s Manual LTO R R www altoproaudio com Version 2 0 Dec 2002 English English COMPRESSOR LIMITER GATE ...

Страница 2: ... apparatus and dis connect the power source Operating Conditions This apparatus shall not be exposed to dripping or spl ashing and that no objects filled with liquids such as vases shall be placed on this apparatus To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Do not use this apparatus near water Install in accordance with the manufacturer s instruct...

Страница 3: ...will create the new ones From our side we guarantee you and we will guarantee you also in future the best quality the best fruits of our continuous researches and the best prices Thank you very much LTO AUDIO TEAM Thanks for choosing LTO BK 2 0 Compressor Limter Gate and thanks for choosing one of the results of LTOAUDIO TEAM job and researches Our LTO BK 2 0 is the result of many hours of listeni...

Страница 4: ...S 6 3 1 Expander Gate Section 3 2 Compressor Section 3 3 Dynamic Enhancer Section 3 4 The Rear Panel 4 READY TO ROLL 9 4 1 Expander Gate Section 4 2 Compressor Section 4 3 Limiter Section 6 TECHNICAL SPECIFICATIONS 13 7 BLOCK DIAGRAM 14 5 INSTALLATION AND CONNECTION 11 5 1 Mains Connection 5 2 Audio Connection 5 3 Rack Mounting 8 WARRANTY 15 ...

Страница 5: ...k limiter SGC This function includes two important functions Clipper and program limiter The peak limiter will be activated above a certain threshold that is adjusted by the User and will radically restrict signal peaks But what about if the threshold of the Limiter is surpassed only for a few milliseconds SGC will turn on automatically and reduce the output signal so that you will not hear any di...

Страница 6: ...se the volume during low passages and decrease the volume during loud passages Unfortunately even the Great Houdini would not be fast enough to monitor carefully the speed of the musical signal and it would be impossible to detect signal peaks and consequently levelling them out Manual control is therefore out of question The answer is AGC automatic gain control a device that will monitor the sign...

Страница 7: ......

Страница 8: ......

Страница 9: ...ed when compression is taking place 3 4 The Back Panel Pic 5 The Back Panel Layout Of The BK 2 0 13 12 15 14 16 OUTPUT INPUT TIP INPUT RING OUTPUT SLEEVE GROUND OUTPUT INPUT TIP INPUT RING OUTPUT SLEEVE GROUND CHANNEL 1 SIDECHAIN CHANNEL 2 SIDECHAIN AC INPUT 95 120V 210 240V6 0 50Hz Rated Power Consumption 8W FUSE 210 240V T100mAL 250VAC 95 120V 200mA 250VAC REPLACE FUSE WITH CORRECT TYPE ONLY SER...

Страница 10: ...processor It simply cut off the entire signal below a certain set threshold The BK 2 0 is equipped with a new kind of expander the SRC Smart Ratio Control The ratio of the SRC is automatically adjusted according to the audio signal level In fact conventional expanders could easily cut part of the musical program with unacceptable result The gain changes become audible We have equipped the SRC with...

Страница 11: ...aps etc a short attack time will be used These peaks are consequently carefully regulated by the compressor Sounds of other nature will get advantages if longer attack times are used Anyway our advice is always to begin the process with longer attack times Then you can start gradually to reduce the attack time IN the BK 2 0 the attack time can be set in a range of 1 to 200 milliseconds Output Hard...

Страница 12: ... IN this way you will avoid undesired dynamic distortion But what about if you are mixing a program with a wide range of frequencies In this case you should choose a setting that would benefit the low frequency better Well life is not that easy for conventional compressor limiters Ok you handle an audio signal made by a wide range of frequencies and you have chosen a longer attack time But if are ...

Страница 13: ...nput b In Line Connection Please see following drawing for details TIP RING SLEEVE TIP RING SLEEVE TIP RING SLEEVE TIP SLEEVE TIP SLEEVE TIP RING SLEEVE TIP SLEEVE TIP RING SLEEVE SLEEVE RING TIP SLEEVE RING TIP SLEEVE TIP Tip Ring Sleeve Tip Ring Sleeve Tip Ring Sleeve Tip Ring Sleeve Tip Sleeve Tip Sleeve Tip Sleeve Tip Ring Sleeve 1 2 3 1 2 3 1 2 3 Tip Ring Sleeve 1 2 3 Centre Centre Centre Scr...

Страница 14: ......

Страница 15: ...0 05ms to 4s 20dB From 20 to 20dB Interactive Expander Gate Variable from OFF to 15dB Dynamically controlled frequency correction Variable from off to 6 Bypass switch Programme dependent attack and release time Type Impedance Maximum input level Type Impedance Maximum output level Frequency response THD N 1kHz 4dBu IMD SMPTE 10dBu Noise Hum unity gain Noise Hum fully off Cross talk 20kHz CMR 1kHz ...

Страница 16: ...15 7 BLOCK DIAGRAM Chart 8 Block diagram of the BK 2 0 ...

Страница 17: ...TO of 1 year from the purchase date if you have completed the Warranty Registration Card in time 3 3 During the warranty service may repair or replace this product at its own option at no charge to you for LTO parts or for labor in accordance with the right side of this limited warranty 3 4 This warranty does not apply to the damages to this product that occurred as the following conditions Normal...

Страница 18: ...audio com Tel 886 4 22313737 email alto altoproaudio com Fax 886 4 22346757 All rights reserved to ALTO All features and content might be changed without prior notice Any photocopy translation or reproduction of part of this manual without written permission is forbidden Copyright 2003 Sekaku Electron ...

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