user guide - Hear Technologies!
Contents
1. When link two mono channels the stereo spread is incorrect The headphone amplifier fault indicator is on need more mixes The fan does not operate How to parallel channels 182 stereo inputs across multiple Master Hubs as shown in the Large Stereo System hook up diagram on page 15 Verify power is on Check input connections and input selector switch Verify the hub and mixers have green clock status indications Check output devices headphones wireless transmitter receiver monitor amplifiers etc Wire TRS outputs using only black ring and red tip wires Disconnect shield at the mixer and terminate at receiving end only For unbalanced outputs wire the Black ring to the receiving end sleeve and tie the shield at the receiving end only Connect the tip red to the tip at the receiving end Set the limiter so it only activates in the presence of an excessive input signal The limiter should only be active in the event of excessive signals and should NOT be on when normal signals are present Isolate the problem as follows Check cable or try another cable Try another mixer output port on the hub Try another mixer Verify the source mixer DAW etc has these outputs panned hard left and right The pan control of the source determines the stereo spread The fault indicator indicates either a short circuit or excessive load Connect the stereo mix channels 1 amp2. hear TECHNOLOGIES hear back Personal Monitor Mixer System user guide 03 04 04 04 04 04 04 04 04 04 05 05 05 05 05 05 05 06 06 06 06 06 07 08 09 10 10 12 13 14 15 16 17 18 18 18 18 19 19 02 system description hear back hub hub features hub inputs input selector switch hub outputs mixer RJ45 pinouts input metering internal fan front and rear panel detail hear back mixer mixer features mixer construction status indicators link operation limiter front panel detail line outputs aux in master volume headphone amplifier connecting and calibration system block diagram system specifications troubleshooting and operating tips hook up diagrams two studios church analog digital audio workstation recording studio large stereo system analog stereo live analog stereo live digital hear back system accessories extreme extender adat in out hearbuds amp hearbud headset monitor cables other hear technologies products limited warranty HEAR BACK SYSTEM DESCRIPTION The basic Hear Back system consists of a hub and personal mixers The hub receives any of the three input signals and converts them to HearBus digital audio plus power The mixers are connected to the hub using cable A single hub supplies digital audio and power to a maximum of eight mixers That s one for you and everybody in the band If that s not enough
3. 13 14 HOOK UP DIAGRAM MIXER OR d CA T P GO RECORDING STUDIO Talk Mod 000 im ho er 256 MIXERS HOOK UP DIAGRAM LARGE STEREO SYSTEM ANALOG hear back MASTER HUB Wi AMALOG MIXER jir i E a UP TO Si ADDITIONHAL HUES cs D Bo E 8 Vocal Mich abe E T 5 122528 lus gr 7 LU 94 rummers Monitor Li im at 5 CS i hear lack MASTER HUB 2 i 5 CUT g UP TO 31 ADDITICHAL a hear back 7 MASTER HUB 3 ma ur TO 31 aa HUES NOTE Each hub gets the stereo mix and sectionals Each master hub can have 31 hubs daisy chained from it 16 HOOK UP DIAGRAM STEREO LIVE ANALOG MIXER F HOOK UP DIAGRAM hear back HUG STEREO LIVE DIGITAL 17 HEAR BACK SYSTEM ACCESSORIES EXTREME EXTENDER ADAT IN OUT Extreme Extenders IN OUT are available for converting from ADAT optical to HearBus and vice versa extreme extender EFI extreme extender Eri Extender Features Extend Optical cables up to 500 feet Convert HearBus t
4. The bus indicator is a bi color LED that is green under normal operating conditions indicating the HearBus clock is present In the absence of the clock the indicator turns red alerting the user a problem exists at the hub or connection to the hub 2 LINK The link indicators and illuminate whenever the associated link switch es an O are pressed Switch settings are stored in non volatile flash memory whenever power is removed CUD N D oLooo Ro LINK y M 4 14 6 LINK WASSER 6 16 i 0 2 17 LINK ui 8 19 10 20 11 21 22 12 Bi Color Bus Status Indicator Link Indicator Channels 3 4 Mono Channel 3 Stereo Link Master Q Link Switch Links Channels 3 4 Mono Channel 5 Stereo Link Master G Link Switch Links Channels 5 6 Q Mono Channel 7 Stereo Link Master Link Switch Links Channels 7 8 Q Stereo Mix Level Control Channels 1 2 10 Stereo Auxiliary Input QD Right Line Output Headphone amplifier fault indicator e Link indicators e Standard CAT5E power and signal connection Balanced mono stereo line outputs 4 dBu level TRS unbalanced stereo AUX in Expand numbers of mixes Drum module metronome or local mix input 3 HEADPHONE AMPLIFIER FAULT The fault indicator 15 normal off and only illuminates red if an over current or short circuit condition occurs The circuit shuts
5. frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help 03 04 HUB FEATURES Three switch selectable 8 channel input sources ADAT Optical Analog HearBus 24 bit A D converters Digital input sample rates 44 1 KHz or 48 KHz Less than 1 5 milliseconds total system delay latency 3 LED four level metering HUB INPUTS 1 The ADAT input can be connected to digital audio workstations digital recorders or digital mixers using a standard TOS Link optical cable For front of house or remotely located digital mixers use a Hear Technologies Extreme Extender ADAT IN that converts ADAT optical which is limited in distance to the HearBus for transmission of up to 500 feet Use Hear Technol
6. the hubs can be daisy chained using the HearBus In and HearBus Out for virtually unlimited system size The hub may be connected to recording equipment digital audio workstations and analog or digital consoles The mixer is placed near the talent and gives them control over the audio inputs The user friendly system saves system setup time FCC Statement ADVANTAGES FEATURES Virtually unlimited system size Excellent quality and audio fidelity High power low distortion headphone amplifiers Very long interconnect without loss of audio quality Three audio inputs ADAT optical analog and HearBus are switch selectable from the front panel Local control of up to ten channels of audio 8 inputs plus a stereo Aux input Built In DSP limiter for hearing and monitoring device protection Headphone amplifier fault LED Bus status indicator Link indicators switches links mono pairs for stereo operation Standard CAT5E cable for power and signal connection to mixers Built in cable strain relief Balanced line outputs mono stereo Stereo AUX in Built In mic stand mount as well as desktop mount capability Note This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio
7. MONO LEFT LINE OUT RIGHT LINE OUT HEADPHONE OUT 1 HEADPHONE OUT 2 HEAR BACK HUB ADAT IN ADAT OPTICAL gt ANALOG INPUTS INPUT SELECT Jo ANALOG 24 BIT A D CLOCK CONVERTER 0000000000000 000000000000 HearBus IN AC POWER IN UNIVERSAL POWER SUPPLY gt E 2 De O lt E 9 a Input Merering x8 HearBus UUUUUUUU HearBus OUT MIXER OUTPUTS 18VDC 18VDC SHORT CIRCUIT PROTECTION EIGHT MIXER OUTPUTS 08 SYSTEM SPECIFICATIONS Aux Input Stereo unbalanced 10 Kohms typical 4 dBu optimal 22 dBu max Input Configuration Impedance Input Level THD less than 0 01 THD less than 0 1 150 mW 230 mW THD AT 8 Ohms 0 015 typical 235 mW 675 mW 950 mW 1 6 W 1 14 W 500 mW 215 mW Typically less than 0 03 Load Impedance 500 mW 775 mW 1 1 W 1 8 W 1 25 W 650 mW 220 mW 16 Ohms 100 Ohms Inter Modulation Distortion Line Out Freq Response DN I 3338883 Sek 0293335 35 3343222 E o0 e o D d e 20 Hz to 20 KHz 0 04 dB 0 55 dB 0 008 typical at 1 KHz 15 dBu 0 02 typical 20 Hz 20 KHz 4 dBu 0 02 typical
8. dBu bright and the red clip LED operate at 16 dBu INTERNAL FAN The internal temperature controlled fan operates whenever the power supply temperature reaches 609 C or 1409 In studio or indoor use the fan should rarely come The hub should be rack mounted away from high temperature devices such as power amplifiers ANALOG 1 CLOCK WARNING NO USER SERVICEABLE PARTS INSIDE MIXER OUTPUTS e Four Level 3 LED Input Metering 2 Input Selector Switch HearBus Clock Status Indicator 4 AC Power Switch AC Power Entry Q Optical Input 2 HearBus Input Q HearBus Output Hear Back Mixer Outputs 10 Analog Inputs MIXER FEATURES Local control of up to ten channels of audio e Master volume e Built in DSP limiter e 24 bit D A converters e Less than 1 5 millisecond total system delay Bus status indicator MIXER CONSTRUCTION The Hear Back mixer is constructed of UV stabilized ABS and has a built in mic stand mount Two cable strain reliefs greatly reduce stress on the CAT5E cable connectors and the mixer RJ45 connector STATUS INDICATORS The mixer has three types of status indicators 1 BUS
9. professional performance at a great value By creating acoustic chambers at the ear hearbuds not only dramatically improve the sound of standard in ear headphones and ear pieces their molded 100 silicon design also significantly reduces unwanted background noise levels enabling you to enjoy sound clarity at lower volumes Included in each package are three sizes for a perfect fit And because they re audiologically designed they re comfortable to wear and won t fall out of your ears either Features Better sound quality at lower volumes e Can be used on stage and in the studio Great for Hear Back players cell phones and other personal audio e Hearbuds alone fit most headsets Works great in noisy environments because they block unwanted sounds e Comfortable safe and secure Designed by audiologists e Washable CABLES Quality cables that work with your Hear Back System cables are available in 2 12 25 50 and 100 foot lengths Optical cables are available in 6 12 and 25 foot lengths OTHER HEAR TECHNOLOGIES PRODUCTS TALK BACK The Talk Back models 200 and 600 add talk back The Talk Back permits the engineer to control talk back capability and control room monitor dimming to recording and monitor switching from the front panel switches the consoles digital audio workstations and portable audio wired remotes and the RF wireless remotes 600 o
10. 2 with the FOH or control room mix across several hubs as many as desired then provide the more me sectional mixes to channel 3 8 on each hub until the desired number of mix s are met See Large Stereo System hook up diagram page 15 The fan only runs when power supply temperature reaches 60 C or 140 F After connecting the stereo mix to channels 1 and 2 at each hub Connect master hub 1 channels 3 8 for band mix connect master hub 2 channels 9 14 for vocals section connect master hub 3 channels 15 20 for horns you get the idea right By using the HearBus outputs on the master hubs and connecting them to the slave hub HearBus inputs you can obtain as many mixing stations of each master mix as desired Since each hub may be daisy chained a minimum of 32 times this example system yields 3 master hubs x 32 slave hubs 96 hubs then 96 x 8 768 mixers NOTE When Y connecting multiple hub inputs one must be concerned with the total impedances The hub inputs are 18K ohms balanced Since the input to output impedance ratio should be at or above 10 1 there are a couple of rules to follow Assuming a mixer source impedance of 180 ohms the following applies 18000 1800 10 Where 18000 source impedance 1800 equals ten times your source impedance 10 2 18000 1800 is the number of hubs that meet the required impedance Therefore you can parallel up to ten master hubs to a quality BALANCED line output In the event you exp
11. F e 1 RU chassis INPUT SELECTOR SWITCH The input selector switch Q gives the user a simple way to select any one of the three input sources without a patch bay router or rewiring HUB OUTPUTS The hub has mixer outputs Q which each deliver digital audio ground and 18VDC Each of the eight hub outputs must be home run to a mixer with a maximum distance of 200 feet Outputs not in use should be disconnected at the hub MIXER RJ45 PINOUTS Pin Function Pin Function 1 Digital Audio 5 18VDC 2 Digital Audio 6 Ground 3 Ground 7 18VDC 4 18VDC 8 18VDC Each of the eight hub mixer outputs has a solid state automatically resettable fuse in line with the power supply outputs to prevent power supply damage In the event of a shorted cable or broken mixer the PTC fuses go to high impedance permitting other mixers to function while protecting the power supply from the faulty output The main AC input is connected using a standard IEC320 cable The universal power supply is designed to operate from 90 to 264VAC at 50 to 60Hz AC input circuit is internally fused A front panel power switch 3 is provided for convenience INPUT METERING The hub features a unique input metering circuit consisting of three LED s for each of the eight input while providing four visual levels The middle blue LED s operate at two different brightness levels The green LED indicates 32 dBu signal presence the blue at 10 dBu dim and 4
12. If the indicator operates during normal program material the dynamic range and quality of sound will suffer NOTE Limiter should only be active when excessive signals are present To set the limiter see Hear Back Connecting and Calibration on page 6 Left Mono Line Output Mono Channel 4 Link Indicator Channels 5 6 id Mono Channel 6 Link Indicator Channels 7 8 Mono Channel 8 Limiter Indicator Limiter Threshold Control Master Volume Headphone Output Headphone Amplifier Fault Indicator 6060060000000 Headphone Output 05 06 LINE OUTPUTS Two balanced inch Tip Ring and Sleeve line outputs provided and D The left operates as a mono output for sub woofers and mono devices if nothing is plugged into the right line output When a 14 inch plug is inserted into the right output the line outputs operate in normal stereo mode The line outputs may be used simultaneously with the headphone outputs and are both controlled with the master volume knob In the event of ground loops when connecting the mixer line outputs to other devices that have an earth ground it may become necessary to lift the shield at the mixer outputs NEVER lift or disconnect the AC safety ground of any device AUX IN The auxiliary input is 1 8 inch Tip Ring and Sleeve input optimized for 4 dBu input levels These signals are summed into the analog section of the mixer just upstream of the master volume The input permit
13. at 4 dBu 60 Hz 7 KHz Better than 85 dB 1 KHz Less than 1 5 mSec Inter Modulation Distortion Propagation Delay 91 dBu analog 97 dBu optical 112 dB typical Noise A Weighted Dynamic Range 8 Balanced inputs on DB 25 female Tascam DA 88 pinout 15 dBu Industry standard fiber optic connector shuttered 8 pin RJ45 jack 2 each 4 unbalanced stereo 2 each 4 balanced 2 each Maximum Output Level Analog 24 dBu mixed output unbalanced stereo Hub Line In Analog Maximum Input Level Analog Hub Light Pipe In Hub HearBus In Out Mixer Headphone Out fos nn ila gt 2 C 2 5 lt 5 Li o o o 5 3 c gt M n n e 9 e o Physical Mixer Size 11 5 29 2 cm H x 5 2 13 2 cm W x 3 6 9 15 cm D Unit Weight 1 2 Ib 0 54 kg Standard mic stand or desk mounted Mounting Physical Hub Size Unit Weight Mounting 1 75 H x 19 W x 7 125 D 5 0 Ib Standard rack mount 1 RU Power Requirements 100 230VAC 50 60HZ 100 Watts Note 0 dBu 0 775 V rms Specifications and features subject to change without notice TROUBLESHOOTING AND OPERATING TIPS No Signal When connect a line level device to the mixer line A outputs hear a buzz Setting the limiter have a clock signal at the hub but nothing at the mixer
14. down the headphone amplifier and upon cooling returns to normal operation Continued cycling of the fault circuit is not recommended as excessive cycling can degrade the amplifier s performance and life LINK OPERATION Normally a stereo mix is connected to the hub channels 1 and 2 These are typically the front of house or control room mix and are controlled using the mixer stereo input knob The more me inputs are typically mono and are controlled using the mono control knobs 6 B O D and The mono signals are center panned in the stereo field when the link indicator is off When a pair of mono inputs are linked three things occur 1 The left channel becomes the link master volume control for the stereo pair 2 The two inputs are hard panned left and right Inputs can be adjusted at the source to have a stereo spread anywhere desired Stereo signals are realized by using a pair of the mono inputs 2 4 5 6 and or 7 8 by simply pushing the link switch 3 The right mono volume now becomes inactive LIMITER The limiter gives the user ultimate control of his her hearing protection as well as headphones in ear and conventional loudspeaker monitoring devices in the event of excessive input levels The two stage DSP limiter is 0 1 or brick wall limiter The limiter is controlled using simple threshold adjustment The limiter active blue LED illuminates when the limiter is active
15. erience problems or if you have an unbalanced output obtain a high quality balanced audio distribution system We don t recommend using unbalanced sources for this connection scheme as hum loops will occur NOTE The HearBus and mixer outputs contain high speed digital audio and should be treated as a transmission line DO NOT Y these connections because the terminated controlled impedance will be comprised The HearBus and mixer outputs operate at 12 28 MHz If you need further assistance feel free to contact Hear Technologies technical support at 1 256 922 1200 09 HOOK UP DIAGRAM STUDIO A IO STUDIO B m mu m Gm Gm n EXTREME EXTENDER IN T Up ns zm um om fi 2 TO MIXERS Speeders spa fr iz Recordar OUT OPTICAL Un to E do 30 ff ADAT iH i EXTREME EXTENDER ADAT OUT 10 HOOK UP DIAGRAM CILE EIL ADAT OPTICAL 3 Up do 500 dt TO STUDIO A STUDIO B 11 12 HOOK UP DIAGRAM T i E mi mm mw Mm mi EE hear CHURCH ANALOG HOOK UP DIAGRAM DIGITAL AUDIO WORKSTATION i 6 8 5 fi tao E SH SH rr hear OUT
16. nly workstations Optional wired and wireless remotes single Applications include professional recording studios and dual button versions are available for control of the project studios and video post production facilities The talk back and or monitor select functions In addition to unit s features and audio specifications rival or surpass these features the model 600 has control room monitor those found in large format recording consoles switching and optional wireless RF remote control ZELE ud RC 1 2 1 2 wired remotes wireless remotes optional for models 200 amp 600 optional for model 600 only LIMITED WARRANTY Quantum Technologies Inc warrants the equipment against defects in materials and labor for a period of one year from the original date of purchase The duration of this warranty is limited to claims made to QTI within the periods stated with respect to parts and labor from the date of purchase During the warranty period defective equipment will be replaced repaired to the general condition as received at the discretion of QTI All transportation is the responsibility of the purchaser or owner Equipment should be shipped in the original shipping box This warranty applies only to defects in materials and workmanship and does not cover failure or damage due to shipping loss or damage abuse misuse misapplication incorrect or varying power line voltages lack of pro
17. o ADAT Optical or vice versa Uses standard cables Does not affect sound quality e Small size durable construction e Clock Status LED on Extreme Extender OUT The units were designed to solve ADAT optical distance limitations The extreme extender ADAT IN converts ADAT optical to HearBus Using the effective length of an optical interface can be extended up to 500 feet This is accomplished without any loss of audio quality The ADAT Thru output provides a buffered pass thru for connection to local ADAT devices The Extreme Extender ADAT OUT converts the CAT5E HearBus to ADAT optical Two parallel optical outputs on the Extender ADAT OUT provide drive for two separate ADAT devices A bi color clock status LED indicates the presence green or absence red of the ADAT clock In addition to acting as an ADAT optical extender the Extreme Extender ADAT IN may be connected to the optical output of any ADAT device such as a DAW mixer etc and connected to the input of a Hear Back hub The extreme extender ADAT OUT can be connected to the HearBus out of a hub to obtain two ADAT outputs Connections ADAT IN ADAT THRU HearBus Out 9VDC EXTREME EXTENDER ADAT IN EXTREME EXTENDER ADAT OUT ADAT is a registered trademark of Alesis Corporation HEARBUDS amp HEARBUD HEADSET MONITOR Hearbuds provide an affordable in ear monitor headset that delivers
18. ogies Optical cables available in 6 12 and 25 foot lengths ADAT Extreme Extenders In Out are available for converting from ADAT to Optical to HearBus and from HearBus to ADAT Optical 2 HearBus The HearBus permits daisy chaining of multiple hubs up to 500 feet apart using the HearBus input Q and HearBus output This HearBus is great for inter studio or stage to stage connections as well as daisy chaining for very large systems Use Hear Technologies cables which are available in 2 12 25 50 and 100 foot lengths 3 Analog Analog inputs Q are fully balanced and are connected using a standard TASCAM 88 style Analog cable such as the Hear Back Analog cable DB25 cable pin outs are wired as shown below A CAUTION Use only DA 88 Analog Do not use TDIF Pin aut for TASCAM 0825 Channel Balanced Connector HL X GE ME JS 1 Bi T ai Im if i ERE n ry Ca QUO RENO FRONT PANEL 9 hear O LINK R LINK R L STEREO R hear back REAR PANEL FUSE 1A 115VAC 0 5A 230VAC 50 60 Hz ADAT IN HearBus HearBus N OUT Standard delivers power and signals to mixers Daisy chain for very large systems e Internal internationally approved universal power supply Quiet temperature controlled fan only runs when power supply temperature reaches 60 C or 140
19. per maintenance natural disasters acts of God or unauthorized modifications repairs or any alterations done without the expressed written consent by QTI QTI shall not be liable for any loss of use of the equipment or consequential damages including damages to other parts of the installation in which the equipment is a part does not make any warranty express or implied other than the warranty contained herein No agent representative or employee has the authority to increase or alter the liability obligations and terms of this warranty or sale of the equipment NOTE It is strongly recommended that any equipment returned to QTI be properly packaged and insured for its full value in case of loss handling or shipping damage shall not be responsible for damage or loss of equipment during shipment The following are registered trademarks of Hear Technologies Hear Technologies Hear Back Talk Back Extreme Extender Hearbuds HearBus and the Jack logo All names and marks of other companies belong to those respective companies 19 TM HEAR TECHNOLOGIES 991Discovery Drive Huntsville AL 35806 Phone 256 922 1200 Fax 256 922 1227 www Hear Technologies com Part No 11700242000 2002 Hear Technologies 12 2002
20. s another stereo mix to be inserted into the mixer Examples of use would be a drum machine click track into the drummers mixer Another application would be a stereo mix from a guitar or keyboard local mix another Hear Back Mixer creating a total of ten channels controlled from your mixer MASTER VOLUME The master volume 20 is used to set the volume of the headphones and the line outputs When using the line outputs in conjunction with the headphones optimize the mix for the headphones and then adjust the device connected to the line outputs to balance the gain Follow the same procedure if using the AUX input once the desired mix is obtained adjust the source to get the desired level at the AUX input HEADPHONE AMPLIFIER The headphone amplifier outputs 6 are paralleled outputs When using multiple headsets the total impedance should not go below 16 ohms The headphone amplifiers are very powerful and can easily damage in ear transducers headphones and your hearing exercise great care in adjusting the master volume At 50 ohms the amplifier is capable of sustaining 2 watts of power The amplifiers are short circuit protected and have a fault indicator WARNING e The Hear Back Mixer is capable of driving most headphones to extreme levels that can damage your HEARING e AL WAYS turn down the mixer Master Volume down before putting on in ear headsets or headphones he mixer Limiter is pre master vol
21. se until the blue LED just comes on then turn clockwise until the LED goes off This sets the limiter to protect your hearing and monitoring device in the event an input goes above normal levels The limiter should only come on when this condition occurs Causing the limiter to operate blue LED on during normal operation will cause a loss of dynamic range and will add distortion to the signals being monitored Remember it is for excessive signals only NOTE The HearBus and mixer outputs contain high speed digital audio and should be treated as a transmission line Do not Y these connections because the terminated controlled impedance will be comprised The HearBus and mixer outputs operate at 12 28 MHz Now enjoy personal monitoring at its best and have fun SYSTEM BLOCK DIAGRAM HEAR BACK MIXER MIXER INPUT gt LINK MASTER MONO 3 L LINK 3 4 MONO 4 R LINK MASTER MONO 5 L RR LINK 5 6 V MONO6 R LINK MASTER MONO 7 L LINK 7 8 V MONO 8 R uCONTROLLER STEREO LIMITER THRESHOLD MM OD OM M HP FAULT MASTER VOLUME 24 BIT D A CONVERTER STEREO AUX IN 24 BIT D A CONVERTER ADS fin 12 41
22. ume and protects from excessive input signals It is the user s responsibility to prevent hearing damage by virtue of excessive headphone Master Volume settings HEAR BACK CONNECTING AND CALIBRATION 1 Connect the appropriate input s as shown in the hook up diagrams beginning on page 10 and select the desired input using the front panel switch Connect mixers to the hub outputs using CAT5E cables and set all mixer controls to off full counter clock wise position except the limiter which should be fully clock wise connect the headphones in ear monitors and or line outputs for connecting to wireless in ear systems powered monitors or other devices requiring line level inputs 2 Turn on hub power 3 Adjust the level at the input source DAW Mixer etc until the clip LED s on the hub just come on and then reduce the input s until you have a bright blue LED NOTE Adjust the source for as much signal into the hub as possible without clipping Higher input levels improve signal to noise and dynamic range 4 Mixer Adjustment Once you have the signals optimized turn the master volume to about 10 o clock and then raise the stereo mix to a comfortable level normally around 10 o clock Adjust the more me mono stereo inputs 3 8 to the desired levels Avoid adjusting the Master Volume too high and running the inputs too low 5 Limiter Adjustment Once a mix is established turn the limiter threshold knob counter clockwi
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