BBE Maxie 401 - Manual (Page 6)

The Controls
Operation of the BBE 401 is quite simple due to the sophisticated “smart” circuitry within the unit. Below are the names and
purposes of each confrol on the BBE 401.
Front Panel
Hl-Z In
Gain
Lo Contour
Definition
Hl-Contour LEDs
Clip LED
BBE " LEDs
Function
Power
Rear Panel
Accepts high impedance microphones or other low level unbalanced devices with average outputs
of -20dBu. Has priority over duplicated rear panel Hl-Z In (MIC).
Controls the gain of the input stage. Startng from minimum, turn the control clockwise until you hear
the same level established prior to inserting the BBE 401. (note: This control is inoperative when unit
is in LINE mode.)
Phase corrected bass equalization. This adjustment ranges from - lOdBu (min) fo -k lOdBu (max)
at 50Hz relative to the input. The middle position is flat or unity gain.
Set to minimum, yields a flat frequency response with phase correction only. Turning clockwise
increases the amplitude of the high frequency band relafive fo fhe mid band amplitude and
provides an improved spectral balance between the high band and the mid band.
These three LEDs indicate the high band amplitude compensation. RED LED (marked “ - ”): Com­
pression mode. The amplitude of fhe high band is too high as compared to the mid band and
compression is being applied to compensate. AMBER LED (marked “0”): Flat mode. No compen­
sation is needed. The program spectral content is correct. GREEN LED (marked “-i-”): Expand
mode. The amplitude of the high band is too low as compared to the mid band and is being
expanded to compensate.
This LED lights when the signal out of the BBE 401 is clipping. The gain control or input level into the
unit must be reduced, (lit at -l- 16dBu).
These two LEDs work in conjunction with the function switch. When the BBE'" process is being
applied to the signal, the GREEN LED marked IN lights and when the AMBER LED marked OUT
lights, the signal is not processed and is bypassed through the unit.
This switch allows a quick comparison of processed with unprocessed sound. When the switch is
in, the signal is being processed.
This switch controls the primary power to the unit.
AC Power Cord
Fuse
Hl-Z Out Line
LO-Z Out
LO-Z Balanced In
Hl-Z In
Line In
Plugs into AC power recepticle.
Turn cap on fuse holder counterclockwise to remove fuse. (Note: replace with 250Vac, 1 /2 A type
fuse).
This 1/4" phone jack is fhe high impedance unbalanced line output. This connects to the input of a
power amplifier or a convenient insertion point of a mixer.
This 3-pin male XLR connector is the ballanced transformer output which normally goes to the point
where a low impedance, ballanced, low level device was previously installed. (Typically a low
impedance microphone).
This 3-pin female XLR connector accepts balanced, low Impedance, low level devices with an
average level of -40dBu. Phantom power (-k24VDC) exists on pins 2 and 3 (pin 1 common).
(Note: If phantom power is present at the LO-Z Out connector of fhe BBE 401 and is greater than
the -t-24VDC already present, it will be fed through to this connector enabling a condenser type
microphone that requires more than -t- 24VDC to be used).
This 1/4" phone jack accepts high impedance, low level, unbalanced devices with an average level
of -20dBu. (Typically a high impedance microphone) (Note: Inserting a jack into the front panel
connector marked Hl-Z IN will disable this duplicate connector.)
This 1 /4" phone jack accepts unbalanced, high impedance, line level devices with an average level
of - lOdBu (Note: This jack is after the input gain stage and when in operation, the gain control on
the front panel is inoperative).