M-AUDIO EX66
User Guide

EX66 � User Guide
If you�re using a digital source with a S/PDIF interface, you can feed it directly into the S/PDIF input � on the back of one of your EX66 monitors using a high-quality 75� S/PDIF cable. You must set the Input Select switch �� to either Now that you�ve connected your audio signal input, you can power on your EX66 monitors using the following procedure: 1) Connect the supplied AC power cord to the IEC connector
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S/PDIF L or S/PDIF R depending on whether that speaker will be reproducing the left or right half of the digital bitstream. Next, run a high-quality 75� S/PDIF cable from the S/PDIF Out jack � of that speaker to the S/PDIF In jack of your second EX66 monitor, and make sure the Input Select switch �� is set to the appropriate setting for that speaker.

2) Plug the other end of theAC power cord into a grounded outlet that is con�gured to correspond with the Voltage Selector switch �� . 3) Turn the Volume knob �� all the way down. 4) Flip the Power switch �� to the On position. You should see the blue LED indicators � light up on the front face of the EX66. 5) With the Volume knob �� still turned down, start playing your audio signal at a normal level. Gradually turn up the Volume knob.

Important - When shutting down your equipment, it�s always best to power off the EX66 monitors �rst in order to prevent a �pop� noise from coming out of the speakers when you power down your mixing board, computer, or sound card. Likewise, you should always power up the EX66 monitors last to prevent a �pop� noise generated from equipment upstream.

3) Setting the Acoustic Space Switch

Earlier, we went over some tips for how best to position your EX66 monitors. Depending on where and how you�ve placed them, you�ll want to adjust the three-position Acoustic Space switch � .
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Figure 9: Digital Connections using the S/PDIF Interface

2) Powering On the EX66
As stated earlier, please make sure the Voltage Selector switch �� on the back of the EX66 is set to the proper AC mains supply. You can rotate the switch with a �at-head screwdriver if necessary. Note that the operating voltage is the one corresponding to the 6 o�clock position.
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FULL: If you�ve mounted your EX66 monitors on tall (0.5m to 1.2m) speaker stands away from walls and corners, we call this �full space.� (Mathematically, it approximates the effect of a simple source operating in free air emitting an omnidirectional acoustic radiation pattern.) In this condition, it�s best to set the Acoustic Space switch � to Full, which will give you the �attest near-�eld frequency response. HALF: If you�ve mounted your EX66 monitors on stands and placed them against a wall, or if you�ve mounted them on the meter bridge of your console in the center of the room, we call this �half space.� (Mathematically, this situation approximates the effect of a simple source operating against an in�nite baf�e, which radiates an acoustic pressure twice that of the full space scenario.) In this condition, it�s best to set the Acoustic Space switch � to Half, which activates a shelving �lter to reduce the low-frequency output by 2dB to compensate for the bass buildup. QTR: If you�ve mounted your EX66 on stands in a corner, or on your console meter bridge against a wall, or on shelves against a wall, we call this �quarter space.� (Mathematically, the acoustic power is equivalent to the full space condition times a factor of four, or twice that of half space.) In this case, we recommend you set the Acoustic Space switch � to Qtr, which activates a shelving �lter to reduce the low-frequency output by 4dB to attenuate the buildup of low-frequency acoustic energy.

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Figure 10: Voltage Selector Switch (Note: Improper combinations can lead to hazardous conditions and/or damage to speaker components not covered by speaker warranty!)

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