KRK ERGO User Manual

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IInnttrroodduuccttiioonn .......................................................................................................................... 33
1.
1.1 The idea behind ER
1.2 ERGO – A Complete System ............................. 3
1.3 How does ERGO work? .................................... 4
1.4 Input Modes .................................................... 4
1.4.2 Analog Input .......................................... 4
1.4.3 Digital Input ........................................... 4
1.5 System Requirements ......................................... 5
1.6 Acoustic Environments, Room Correction, and ERGO 5
1.6.1 It’s not your speakers, it’s your room ......... 5
1.6.2 Room Correction so far ............................ 5
1.6.3 So, why not flat and without reflections? ..... 6
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2.1 Back Pane
2.2 Front Panel ....................................................... 8
2.3 Side Panel ........................................................ 9
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nstalling your Monitors ................................... 10
3.1 I
3.2 Positioning your Monitors ................................ 11
3.3 Connecting your System – What goes where? ... 12
3.4 Test Signal and Measuring Techniques ............. 14
3.5 ERGO with RoomPerfect™ is the solution .......... 14
3.6 Software Installation ........................................ 15
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et up ............................................................ 17
5.1 S
5.2 Calibration ..................................................... 18
5.2.1 Enabling Calibration .............................. 19
5.2.2 Adjusting ERGO’s Volume ...................... 19
5.2.3 Focus Position Measurement .................... 20
5.2.4 Room Position Measurements .................. 22
5.2.5 Room Correction .................................... 23
5.2.6 Room Knowledge ................................... 24
l and Connections .............................. 7
GO .................................... 3
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6.
1 Scenario 1 ..................................................... 26
6.2 Scenario 2 ..................................................... 27
6.3 Scenario 3 ..................................................... 27
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Appendix
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7.1 U
sing ERGO in ASIO Mode ............................ 28
7.2 Using ERGO in WDM Mode ........................... 28
1 Pro Tools® ..................................................... 29
8.
8.2 Cakewalk/Sonar™ ......................................... 29
8.3 Ableton Live™ ................................................ 30
8.4 Nuendo® ...................................................... 30
: Glossary of Terms ....................................... 35
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Thank you for purchasing the ERGO Room Correction System. We appreciate your trust in us. ERGO (EEnhanced RRoom GG
eometry the performance on any loudspeaker/monitor system by digitally correcting your room’s acoustic problems. A few of ERGO’s bells and whistles are:
• High-performance, state-of-the-art Digital Signal Processor
for room correction and analysis
• Mastering grade Analog-to-Digital and Digital-to-Analog
converters
• Standalone correction - No computer is required for room
correction
• Analog or Digital Inputs/Interfaces
• Large Analog Volume Control
• Built-in speaker selector
• Top-notch RoomPerfect™ technology corrects phase and
frequency problems
• ERGO Cal Software compatible with Mac and PC platforms
• Professional calibrated measurement microphone
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There ar from professional musicians or a regular Joe trying to unwind from the stresses of life. But, there aren’t always great rooms, or studios, to back up that sound. ERGO was developed after years of listening to the same comments - that mixes don’t sound the same outside of the studio. And, true, there are several other room correction products out there already. But, typically they’re only analyzing and correcting 1-8 EQ points. ERGO uses multiple measurements and thousands of EQ points to control your audio environment. Our 3D model allows you to preserve the “good” characteristics of the room, while correcting the bad.
OOptimization) is an exciting product that enhances
e a lot of great sounds out there - whether they come
ERGO doesn’t color the sound or produce an artificially sterile environment. So after using ERGO, you will hear the difference. You will be able to “trust” the sound of your room, concentrate on your music, mix faster and accurately, and create mixes that will properly translate to other listening environments. That’s why KRK developed ERGO. Because really, how good is a great track that only sounds great in your room?
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ER
GO is a complete room analysis and correction system. All of the components have been carefully selected to work in perfect harmony to provide the most accurate room analysis and correction system on the market today. The ERGO system consists of 3 main components:
• ERGO Mic – Calibrated Measurement Microphone
• The ERGO base unit – Room Correction System
• ERGO Cal Software – Room Analysis and Control
To configure ERGO’s parameters and check system information, just open ERGO’s Control Panel. (For more information about ERGO’s Control Panel please read Chapter 4).
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ERGO takes a stereo aud
io stream from the analog or digital (SPDIF or FireWire) domain and processes it though a 96 kHz room correction algorithm. All incoming analog audio is sampled at 96 kHz, while incoming digital audio is sample rate converted up to 96 kHz for processing. If incoming audio comes in over FireWire, the processed audio is converted to reflect the output frequency of the ASIO driver, up to 192 kHz. In Digital Input mode, the output frequency and the audio going to your monitors is going through digital to analog converters fixed at 96 kHz sample rates.
ERGO’s architecture provides the best audio quality while maintaining compatibility with existing systems. In fact, the audio converters used in ERGO are the same as those found in multi-thousand dollar audio workstation hardware. Rest assured...you can’t go wrong with ERGO.
www.krkergo.com/videos.php?vid=intro
Visit
to watch ERGO’s
Video Introduction.
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ERGO has 3 Input modes (Fig
ure 1);
• FireWire Audio Input
• Analog Input
• Digital Input
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mode, ERGO looks like an ASIO audio device under
In this Windows, or as a CoreAudio device on a Mac. To ensure your monitor or mastering mixes will be correctly compensated for your listening environment, it is recommended that you select ERGO as your DAW main Left/Right outputs or output bus. At the moment, Windows supports a single ASIO device, so you must use ERGO as your only audio interface. To use your existing multichannel audio interface with ERGO, just run ERGO in Analog or SPDIF Input modes.
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The Analog Inp
ut mode is the easiest way to implement ERGO into your existing listening environment. If you already have your DAW set up just the way you like it, and like your current audio hardware, just plug the main Left/Right outputs of your DAW hardware into the ¼” balanced inputs on ERGO. ERGO’s high-quality converters will maintain the integrity of your mix while correcting your room’s problems.
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This is similar
to the Analog Input mode, except that a digital SPDIF Input is used. The SPDIF on ERGO accepts any input signal from 44.1 kHz up to 96 kHz. The analog speaker outputs in this mode will be fixed at a 96 kHz sample rate.
Figure 1
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A co
mputer is required for performing room measurement and
analysis. Minimum required computer specifications are:
Mac® 800 MHz (or faster) processor • 256 MB RAM • 6-pin FireWire port (or 4-pin FireWire port using 4-6 pin adapter, not supplied)
• Mac OS X 10.5 or later.
PC® 1 GHz (or faster) processor • 256 MB RAM • 6-pin FireWire port (or 4-pin FireWire port using 4-6 pin adapter, not supplied)
• VGA with 1024 x 768 resolution (or higher) • Windows XP or Vista.
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Most studi be used in listening rooms with optimized dimensions and acoustic treatment. However, most home or budget studios are placed in less than ideal acoustic environments. This means that the actual performance of your monitors is highly dependent on the acoustics of your listening room. In fact, the perception of your mix will change based on where you sit while monitoring and the speaker’s placement.
To put this into perspective, extensive measurements in different rooms show that even when a high-end system is placed in a well-controlled room, peaks and dips between +10 to –20 dB in the frequency response are more the rule than the exception! Refining speaker design with the goal of creating a “linear” sounding audio system by improving the linearity of each component 0.2dB doesn’t actually help much.
o monitors are created to be flat and precise, and to
In addition, it is obvious that even if the greatest of care is taken over tweaking the system with cables, interconnects, power stabilizers, etc., none of that will never compensate for 10 to 20 dB peaks and dips in the frequency response. It’s clear that the room is the weakest link in the chain. In principle, if you strengthen the weakest link, then the entire chain is improved. In other words, improve the overall quality of your artistic projects using ERGO.
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Today
, most room correction is carried out based on a single measurement at the listening position. This is problematic because you are trying to solve problems in a 3 dimensional sound field by taking a 1 dimensional measurement. To accomplish this feat would require extraordinary acoustical skills and luck to reach the right conclusions based on this single measurement – so if this does work for you, you should head out to your local store and buy a lottery ticket immediately! Even taking a number of positions around the listening position and averaging them is not a good solution, as tests have shown that moving the microphone just 10 cm (4 in) relative to the listening position easily results in 20 to 40 dB deviations. So, unless you are a very skilled in acoustics, the chances of making a wrong decision are huge.
Another crucial decision is how to define on the ideal target response – logically, if you don’t know the target, it is impossible to get there. Instead of making measurements at the listening position, some systems measure the way the loudspeaker couples to the room (the acoustic impedance). In addition, such a power response measurement can correct the issues you have “globally” through the room. However, it will never perfectly solve the problems at the listening position.
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“The ideal response is flat and without reflections” is a statement you’ll hear if you ask people what the perfect sound would be for them. However, for various reasons, it is not ERGO’s goal to do this. Instead, ERGO is focused on making the room sound right, reflections and all.
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We are used to list music outdoors is rarely satisfying as it is missing something: bass and impact. In other words, what we define as the generic in room bass enhancement sounds natural to us, which is precisely why you shouldn’t compensate for this.
Secondly, listening to a speaker with a flat in room power response sounds very bright. Measuring the direct on-axis response will look flat, but at the listening position the sound will roll off towards the high frequencies – due to distance, directivity, off-axis listening, general high frequency absorption, and reflections in the room.
Last of all, reflections are a big part of how we determine directionality and ambience. That is if there are no reflections, a lot of the 3 dimensional information would be lost. If you are trying to simulate how something will sound in a given position in a room, you need to simulate a minimum of 100,000 reflections – otherwise, it just doesn’t reflect what happens in the real world. Therefore, the challenge is not to remove the room and the reflections – but to work with them.
ening to music inside a room. Listening to
Speaker designers obviously have an idea of how a loudspeaker should sound. ERGO strives to preserve the speaker’s identity, no matter what kind of room you’re in or how the speaker is placed. You bought your great KRK monitors (or some other monitors) because you liked the way they sounded and we understand that. That’s why ERGO does not make every audio system sound the same. The tonal balance of your speakers will be kept intact – but ERGO will match them to your room by compensating for the room’s influence. Generally, room influence can be defined as peaks and dips in the frequency response. Some can and should be compensated for, others cannot and should not.
So now you see the challenge involved in creating a room correction system that maintains the tonality of your system and only compensates for problems that can be solved. ERGO can correct for many of these issues and help your mixes to properly translate to other listening environments.
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In th
e Back panel (Figure 2), ERGO includes:
• On/Off Switch
• Power Input
• FireWire Ports
• SPDIF IN
• Cal Mic Input
• Line Inputs (L & R)
• Calibrate button
• Speaker A and B/Sub Outputs
• Headphone Output
Figure 2
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witches the unit On or Off…
It s
PPoowweerr IInnppuutt
O’s power input accepts a 12VDC power supply capable of
ERG delivering a minimum of 1 amp. If you intend to keep ERGO hooked up to the FireWire port on your computer (6-pin), you do not need to use the external power supply, as ERGO is designed to use the power coming in via the 6-pin FireWire port.
While ERGO can use a 6-pin FireWire port’s power for itself, many times this will be a bit “noisy.” If you find this to be true in your case and you think ERGO is not providing the best sonic quality that it can, go back to using the external power supply. Keep in mind, that you will always need to plug ERGO into the external power supply when using a mini 4-pin FireWire cable since it does not provide power like its 6-pin counterpart.
FFiirreeWWiirree ppoorrttss These 2
ports allow input and daisy chaining of FireWire signals. One of these ports must be used while ERGO is measuring and calibrating your room.
NNoottee
ually, the FireWire port is only used when ERGO is
Us running its room analysis. After the analysis is complete, you can unplug the FireWire interface and still use ERGO in Standalone mode using the Line or SPDIF Inputs.
SSPPDDIIFF IINN
eives digital audio data.
It rec
CCaall MMiicc IInnppuutt
ack is used to connect the ERGO measurement microphone.
This j It is only used during the calibration process.
NNoottee
is recommended that you use the mic supplied with
It
ERGO for room calibration. ERGO supplies a 15V phantom power source to its microphone, and using other mics for calibration may result in poor room analysis and improper correction filters.
LLiinnee IInnppuuttss ((LL && RR)) These balanced/unbala
nced audio inputs are used either as inputs from your existing audio interface or as recording inputs from a mixer. You may want to use the Analog Inputs for one of the following reasons:
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• You have a complex or well-established FireWire configuration on your computer and don’t want to interfere with it.
• You are using an analog console and mix “outside of the box.”
CCaalliibbrraattee bbuuttttoonn
need to press this button to proceed with the Calibration
You process.
SSppeeaakkeerr AA aanndd BB//SSuubb OOuuttppuuttss These balanced/un
balanced outputs are connected to your powered speakers, or to an amplifier and speaker combination. These are line level outputs. It is recommended that balanced cables and connections be used to ensure the best audio quality.
HHeeaaddpphhoonnee OOuuttppuutt Connect your 1/4 in
ch headphone here.
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e Front Panel (Figure 2.1), ERGO features:
In th
• 3 Status LEDs (Clip, IO/FireWire and Calibrate)
• 3 Buttons (A, B/Sub and Focus/Global)
• 1 Volume knob
SSttaattuuss LLEEDDss
CClliipp Thi
s LED illuminates when the incoming audio signal is 3dB from full-scale input, indicating a likely clip condition. This is used during the calibration process and when the incoming main output signal is inserted into the Input (Line In) jacks on the back of ERGO. This is also used when using ERGO as a FireWire recording interface to indicate excessive signal coming in from the line-level device (mixer, keyboard, etc).
IIOO // FFiirreeWWiirree This bi-
color LED illuminates red when power is applied, and
green when a valid FireWire connection is detected.
CCaalliibbrraattee The Cal
ibrate LED illuminates when the Calibrate button is pressed on the back of the ERGO unit. While in Calibrate mode, the Line In signals are no longer active and the MIC input is active.
BBuuttttoonnss
AA When applying o
ne input, use the A input and press the button to enable. When the button is unlit, there is no audio passing through.
Figure 2.1
So lets read their description;
BB//SSuubb When connect
ing a second input, and you want to hear both A
and B speakers, press B/Sub to enable this function.
NNoottee (non-Subwoofer) mode, only the A or B speaker can be selected. ERGO is smart enough to make the A/B buttons mutually exclusive. Using ERGO, it is possible to set ERGO up in Subwoofer mode. In Subwoofer mode, ERGO makes the A/B buttons independent, so that you can mute or enable the sub in
e software control panel selects the speaker mode. In default
Th
conjunction with the A speakers.
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FFooccuuss//GGlloobbaall ERGO has two mod
es of operation; Focus and Global.
In Focus mode all of ERGO's processing power is correcting the focus (sweet spot or mixing) position, correcting time and frequency domain problems. Use this mode when mixing your tracks.
In Global mode, ERGO's processing power is correcting a much larger area, so it is only fixing frequency related problems. Use this when you want an audience to hear the corrected room.
When the Focus/Global button is depressed for two seconds, ERGO enters Bypass mode (indicated by the LED flashing). In Bypass mode, audio is passing straight through with no correction being performed.
VVoolluummee kknnoobb
big Volume knob adjust ERGO’s volume. Also, it will allow
This you to adjust ERGO’s volume to a proper level, so it is adequate for the calibration process.
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(Figure 2.2
)
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e right-hand side of ERGO, is a rotary knob that controls
On th the headphone volume. Why the right-hand side you may ask? Because 90% of the world is right-handed, and because most mastering/control-room sections in the studio are located on the right-hand side, and because the main Volume knob for ERGO is on the right-hand side of the unit, making your hand naturally rest on the headphone volume knob, yadda, yadda, yadda…Basically, it just belongs there.
If ERGO is used in FireWire Audio Input mode, the headphone output is a separate audio stream. So, your DAW can send a monitor or custom headphone mix to this stream, and it can be controlled independently using this little knob on the side of ERGO. That’s really nice, isn’t it?
CCaauuttiioonn
ERGO’s headphone amplif
ier is l-o-u-d, loud. We are not talking about “Oooh, that’s a bit loud” kind of loud, we are talking “Oh my freaking head just exploded due to the insane loudness coming through the cans!” kind of loud.
and slowly raise the volume level.
Be very careful with this volume control. Start low
Also, ensure that your system sounds are balanced with your DAW mix, or your next wrong mouse click/error ping could implode your melon. That would seriously be not cool.
Figure 2.2
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It’s time to get ready to set up your mixing environment. This consists of 3 easy steps:
1) Set up your monitors - you may have already put them exactly where you want them, but please read the next section as you may learn something about monitor positioning that will ensure you get maximum enjoyment out of ERGO.
2) Hook up cables - this is always fun as you will get to plug things into and out of your ERGO. Follow the directions and you will be rewarded.
3) Run the software - this is always not fun, as software is typically horrible and causes all kinds of headaches. Thankfully, ERGO’s software is simple to install and use, but it does require that you pay attention to the instructions in this manual and on your computer screen.
OK, let’s make sure your monitors are properly set up!
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Before
to install your monitors, it is a good idea to understand what happens in your room depending on speaker placement and other tidbits like that. You see, with ERGO, there’s a change up in traditional loudspeaker placement rules – you can break away from conventional “free space” placement. In general, loudspeakers are placed well away from rear and side walls to secure the best possible frequency response. Considering that a traditional box loudspeaker has omnipolar dispersion in the bass region, this “free space” placement has a big disadvantage since it is possible to destroy the impulse response. The reason for this is that you hear both the direct sound from the speaker and later all the reflections from the walls. The reflections are delayed as a consequence of the distance to the walls and will end up arriving later...think the smeared “attack” of a snare drum that you may have heard in the past, for example.
Typ
ically, back wall reflections are annoying because they arrive from the same direction as the direct sound from the loudspeaker. Side wall reflections are easier for the brain to cope with simply because they arrive from another direction and because of this, they are often regarded as adding ambience and localization clues. If you place the loudspeaker close to the back wall, the bass reflections from the wall and the direct sound will arrive simultaneously at your listening position.
Impulse response in the bass region can be improved considerably since ERGO can easily compensate for the uneven frequency response as a consequence of the placement. With ERGO, it can actually be to your advantage to place your loudspeaker in a less than ideal “close wall” spot as this will improve the impulse response while ERGO corrects it. In addition, when compensating for the increased efficiency, the load on both amplifier and loudspeaker is decreased meaning that less distortion and better headroom are achieved. Taking energy out of the system also has another advantage since pumping less energy into the room means that room modes are less excited. So, you achieve a much more even power response across the room – That is the differences between peaks and dips in the response are reduced dramatically.
In a case like this, the room correction index will also be quite high since correction in the bass region is needed. However, the index number is not high because you have a “poor system” it’s high just because you have chosen a loudspeaker position that improves the impulse response but then requires compensation for the increased efficiency in the bass region. Try it out and see what works for you – near wall or “free space” placement – ERGO works in both cases.
The close-field monitor, by definition, reduces room interaction. This can be compared to the conventional stereo configuration or the large monitor arrangement in a recording studio where sounds emanating from the monitor or reflecting off ceilings, walls, and floors greatly affect the sound quality.
10
60°
60°
Focus / Listening Position
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60°
60°
Focus / Listening Position
By shortening the path to the ear, the close-field monitor offers a tremendous amount of flexibility, allowing the sound to become less susceptible to differing room conditions. The ability to adjust the high characteristics is equally important to help compensate for room irregularities and achieve the highest sound accuracy.
A room that is heavily dampened would typically require a slight high frequency boost. Likewise, reducing the high frequencies can alter a reverberant room.
Placing the monitor close to a rear wall, side wall, or a corner will reinforce the low frequencies. Generally speaking, if you move them two to three feet away from walls and corners, you'll hear less low frequency interaction (excluding any interaction with the mixing console).
There. That wasn’t so bad, was it? You did good.
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Positioning your monitors corre
ctly in the studio is critical to their performance. Typically, they should be placed so that that the listening position is fully “covered” with all monitors resting on the same horizontal plane. To test a monitor for its imaging capability, playback a song that includes acoustic instruments, to fully represent the entire sound spectrum.
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• Near-Field Configuration
– In a control room situation, the monitors are often times placed on the meter bridge or in a close-field listening position. Initial placement starts by measuring out a simple equilateral triangle (all three sides equal in length) with the apex at the center of the listening position as an “overlay” for the stereo installation. In this configuration, the Left and Right monitors are each placed at a 60° angle, equidistant from the listening position. (Figure 3)
Figure 3
• Mid-Field Configuration
– This configuration is similar to the close-field configuration. It is normally used with larger monitors or when the monitors are too large or heavy for the meter bridge. This set up has the potential for a larger sweet spot and better spatial imaging. Make sure that the height of the woofer is above the height of the console. (Figure 3.1)
You can adjust the angle of each monitor by listening for dead spots. Keep in mind, changing the angle or position of a monitor will change the way that you perceive your music. So lets analyze a few examples;
Figure 3.1
11
Subwoofer
Left
Right
Focus / Listening Position
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AAddddiinngg aa SSuubbwwooooffeerr Begin by
determining the best location for your subwoofer. If
possible, the optimum set up would reflect that shown in Figure
3.2; however, this set up may not be practical, or possible, in your room. Once you have set up your monitors, listen to program material that you know contains low frequency information. If your subwoofer has a phase switch, adjust the subwoofer to provide the highest frequency setting possible. Flip the switch back and forth to find the loudest setting. Then adjust the sub’s low pass filter so that it works in conjunction with the satellite’s high pass frequencies. When you have finished, readjust the level of the sub. (Figure 3.2)
1) Plug ERGO into your computer by connecting it to the FireWire port. ERGO ships with a 6-pin FireWire cable that supplies both power and data. If you are using a laptop that has a 4-pin FireWire cable, you’ll need to dig up an adapter cable to use ERGO.
2) Plug in ERGO’s Microphone adapter cable. This is the little XLR to 1/4” TRS cable that shipped with ERGO.
3) Go into that box in the corner of your room and dig up your best XLR mic cable. Make sure it is about the length of the longest dimension of your room. Also make sure it is your BEST cable and it is in working order. Plug this into the ERGO’s XLR-1/4” adapter.
4) Plug in ERGO’s microphone into your best cable that you installed in the previous step. Place the microphone in your best microphone stand, you know, the one in the other corner of your studio. Put this aside for the time being.
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(Fi
gure
3.3)
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Now you cables is always a rewarding experience, as the gratuitous “thunk” of a cable seating into a jack provides a sense of accomplishment, both aurally and tactically. So here are the steps for hooking things up:
Make sure power is Off at your monitors/amplifier, computer, and ERGO’s power switch is Off. This is an important step. Please follow it to ensure things go smoothly.
Figure 3.2
get to plug things into ERGO. Plugging in audio
Figure 3.3
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