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M-Audio BX10s [5/8] Studiophile bx10s subwoofer

4 Studiophile BX10s Subwoofer

Setting Up the BX10s

AC Voltage Select: Since the BX10s contains its own ampliﬁer, it must be

connected to a power outlet using the detachable AC cable provided. Note that

the “AC Select” switch (located below the IEC socket for the mains power cord)

is user-selectable for 100-120V~50/60 Hz or 220-240V~50/60Hz operation.

Before you do anything, make sure the AC voltage select switch is set to the

appropriate position for your location.

Warning: Use of improper voltage/selector switch combinations may result

in hazardous conditions and/or damage to speaker components not covered by

speaker warranty.

Connecting Audio

2-Channel Stereo Operation: Connect the main left and right outputs of

your mixing console, audio interface, or sound card to the XLR or TRS balanced

inputs

on the back of the BX10s; then route the left and right XLR or TRS

balanced outputs

to your direct-ﬁeld monitors. (While the TRS inputs and

outputs will work with unbalanced cables, we strongly recommend you use

balanced cables—in doing so, you’ll have better immunity to inductively coupled

noise from power cables, etc.)

< XLR PIN 1 and TRS sleeve = signal ground (shield)

< XLR PIN 2 and TRS tip = signal positive (+)

< XLR PIN 3 and TRS ring = signal negative (–)

Multichannel (e.g., 5.1-channel surround) Operation: If you’re

mixing or monitoring a multichannel source, you undoubtedly have an external

bass management system and/or you may be sending the LFE (low-frequency

effects) channel directly to the subwoofer with no additional signal redirection.

In this scenario, you can route your subwoofer audio signal to either the left

or right input on the BX10s. Further, you should bypass the BX10s’ internal

crossover by setting the crossover control to the 200Hz position (fully open).

Adjusting the Back Panel Controls

Crossover control* : we’ve touched on this topic already, but to complete

the discussion, consider the following:

< The crossovers of most A/V home theater systems are set to 80Hz

(assuming they’re being used with a subwoofer). So if you’re mixing

multichannel material using the BX10s, we recommend you start with the

80-Hz setting as a reference to approximate a typical end-user listening

environment.

< For easy compliance with Dolby Digital, DTS, and THX recommendations,

we’ve provided calibrated markings on the crossover dial for 80Hz, 100Hz,

and 120Hz positions (in addition to 50 Hz and 200 Hz).

< If you’re using the BX10s with M-Audio’s BX5a direct-ﬁeld monitors in a

2-channel setup, we recommend you start with 80Hz as your crossover

point and adjust it to suit your particular acoustic environment.

< If you’re using the BX10s with M-Audio’s BX8a direct-ﬁeld monitors in a

2-channel setup, we recommend you start with 50Hz as your crossover

point and adjust it to suit your particular acoustic environment.

Phase control : as we mentioned before, this switch inverts the signal (the

phase angle from 0° to 180°) that goes to the subwoofer ampliﬁer. (If you’re

operating a 2-channel system with the built-in crossover, the phase function does

not affect the signal going to your direct-ﬁeld monitors.) You can select the

appropriate position of this switch by listening to the way the sound from the

BX10s blends with the rest of your system. There is no “right” or “wrong”

position, per se—but logically you want the subwoofer to be “phase coherent”

with your direct ﬁelds at the crossover frequency. One way to determine this

phase coherence is by playing a sine wave signal at the crossover frequency

you’ve selected and put the phase switch in the position that gives you the

strongest output.

Standby Mode

: this function allows the BX10s to go to “sleep” if you’re

not using it. In a sense, it’s like an “audio screen saver.” When the switch is set to

“always on” the subwoofer will be continuously alert and operating; whether or

not you’re using it, it’ll stay on. When the switch is set to “auto sleep” and there

is no audio input signal for at least 15 minutes, the BX10s will go into a low-

standby mode and its amp will mute; an input signal as small as 7mV will “wake

up” the subwoofer and it will reproduce sound normally. (Note that the blue

power LED turns red when the BX10s is asleep and it reverts back to blue upon

awaking.) The “auto sleep” mode can be useful if you want to conserve energy.

In sleep mode, the power draw falls to one-tenth the maximum current.

M-Audio BX10s [5/8] Studiophile bx10s subwoofer

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