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recorded!  Always be prepared for the drummer who says he loves the John Bonham 
kick drum sound (lots of low end power and ambiance) that you got when recording 
but during the mix decides he wants to sound like Metallica (more click than punch).  
If you get the sounds right when you record the tracks you shouldn’t be spending a 
lot of time re-EQ’ing during the mix.   

• 

During mixing you should be concentrating on the blending of tracks and the 
dynamics of the song.  If you find yourself EQ’ing everything, take a break and 
come back to it later.  Start mixing with a group of instruments (the whole drum kit 
or guitars and bass) instead of listening to individual tracks.  Mixing is the time for 
tweaking – not applying a sonic re-design.  Once again, “if it sounds good, print it!” 
Trust your ears – never mind where the knobs are pointing. 

Special Effects 

For industrial, metal, or just “flavor” textures, experiment with the Pro Channel.  
Overdriving the preamp, compressor and equalizer circuitry can add interesting textures 
when blended with vocals and other instruments.  Placing signals purposely out of phase 
can also yield interesting results.  No harm will come to the Pro Channel with this type 
of experimentation.  However, be sure to have output and monitoring levels turned 
DOWN before “testing” the sound.  Remember, you have a great amount of gain 
available in the Pro Channel! 

Grounding 

Connecting several pieces of equipment (from several different manufacturers) together 
without ground loop problems is one of the most common challenges in recording.  For 
this reason, all ART recording gear does 

not

 have a direct connection between the audio 

circuit ground and the chassis ground.  This enables the gear to be safely grounded 
through the 3-prong AC cord, and also to be grounded to the previous and/or next item 
in the signal chain for optimum noise performance.  It also implies that 

at least one 

ground connection 

must

 be made between the Pro Channel and the rest of the signal 

chain that it is connected to.

  

Tube Replacement 

The Tubes in your Pro Channel should last for many years.  They are hand-sorted for 
optimal performance in our specific circuits.  In the event that you need to replace them, 
A R T suggests that you do so with tubes available from A R T.  These are matched to 
the Pro Channel and will yield consistent sonic results.  You can replace the tubes with 
other brands, however A R T has no responsibility for the resulting sound quality.  They 
may sound better, they may sound worse.  The choice is yours.  Please realize that 
unauthorized alterations to the Pro Channel will result in voiding the warranty. 

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Summary of Contents for Pro Channel

Page 1: ...HNOLOGY Inc 215 TREMONT STREET ROCHESTER NEW YORK 14608 USA 716 436 2720 Voice 716 436 3942 Fax Internet http www artroch com E mail art art com Pro Channel Professional Tube Mic Preamp Compressor Equ...

Page 2: ...Pro Channel PROFESSIONAL TUBE MIC PREAMP COMPRESSOR EQUALIZER USER S GUIDE...

Page 3: ...S INDICATORS 7 PREAMP CIRCUIT 7 Gain Control 7 Gain Switch 8 Phantom Power Switch 8 Phase Switch 8 Tube Drive Gain Reduction Display 9 Preamp Output 9 COMPRESSOR CIRCUIT 10 Threshold Control 10 Ratio...

Page 4: ...VU Meter 15 VU Meter Switches 15 Power 15 REAR PANEL CONNECTIONS 15 INPUT AND OUTPUT CONNECTIONS 15 Input 16 Output 16 LOOP INSERTS 16 Preamp Compressor Loop 16 Compressor EQ Loop 16 Loop Connections...

Page 5: ...s A solid state input circuitry Both electro optical and variable mu compressor designs Tube based semi parametric four band equalization with selectable frequency ranges and Q Three hand selected tub...

Page 6: ...ign Notes The Pro Channel is a multi purpose tool for audio engineering and recording Enclosed in a two rack space 2U chassis are three independent circuits featuring a tube based analog preamplifier...

Page 7: ...rotect the unit during initial shipment Please retain this carton for use in transporting the Pro Channel or in the unlikely event that you need to return your Pro Channel for servicing AC Power Hooku...

Page 8: ...o produce a thump on power up and power down Note Like all tube based equipment the Pro Channel needs to warm up before being used Allow one to two minutes for the tubes to reach proper operating temp...

Page 9: ...leaking from a tire when phantom power is disconnected but some can make some very nasty low rumbles and whines as well Another Note MOST dynamic microphones should not be affected or damaged if they...

Page 10: ...g for a range before it turns into a distortion box After some use you ll find that the sweet spot of the Pro Channel is when this light flashes fairly regularly and the top red LED flashes occasional...

Page 11: ...ery mild and musical compression ratio which is ideal for smoothing all types of signals At its maximum position the compression ratio is greater than 10 1 This is typically called hard limiting as it...

Page 12: ...is to remind you that the compressor is out of the signal path but still gives you an indication how much compression will result when the compressor is engaged Use the Bypass switch when setting the...

Page 13: ...s as range of 12dB Two ranges are selected with the Low Shift Switch 40Hz or 120Hz 40Hz is great for enhancing sub low frequencies such as those in bass guitars and kick drums Cutting 40Hz can also he...

Page 14: ...h The Hi Mid Shift x 10 switch determines the range over which the Hi Mid Frequency control will cover In its out position the range is set at 200Hz to 2KHz In its in position the range is set at 2KHz...

Page 15: ...qualizer circuit to enable you to remove it from the signal chain When set to its in Bypass position signal is allowed to pass from the compressor circuitry to the output tube section with no equaliza...

Page 16: ...hand switch is set to Output the left hand switch has no effect Another Note The internal level monitoring points correspond to the level at the Send jacks of the two insert loops If you are using eit...

Page 17: ...ack is inserted The loops may also be utilized to re patch the compressor and equalizer circuits in a different order i e signal flow preamp to equalizer to compressor Preamp Compressor Loop A loop is...

Page 18: ...microphone instrument or line level source To use the Pro Channel as a mic or line preamplifier only simply press the Bypass switches to bypass the compression and equalizer circuitry Plug a microphon...

Page 19: ...rument can be fixed by simply isolating the bad frequency and pulling it out After you determine approximately where the problem area is in the instrument highs lows mids isolate the track and boost o...

Page 20: ...ever be sure to have output and monitoring levels turned DOWN before testing the sound Remember you have a great amount of gain available in the Pro Channel Grounding Connecting several pieces of equi...

Page 21: ...Block Diagram 20...

Page 22: ...s 3sec program dependent Maximum Compression 30dB optical 23dB vari mu EQ Frequency Bands Low Shelf 40Hz 120Hz selectable Low Mid Sweepable 20Hz to 200Hz 200Hz to 2KHz Shift out in Low Mid Q Wide Narr...

Page 23: ...paid delivery to the factory service department or an authorized service center accompanied by proof of purchase date in the form of a valid sales receipt EXCLUSIONS This warranty does not apply in th...

Page 24: ...ization RA number 4 Pack the unit in its original carton or reasonable substitute The packing box is not recommended for a shipping carton Put the packaged unit in another box for shipping Print the R...

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