Ada MB-1 - Page 9

ADA MB-1 owners manual version 2
Effect Loops
The MB-1 allows you to add external effects to your sound and switch them in and out under
program control. Two effect sends and returns are provided -- an "A" channel and a "B"
channel. Both are identical and provide individual send and receive level controls on the rear
panel. The two effect loops are in parallel and either one or both may be switched in or
bypassed as desired.
Crossover
The manually controlled Crossover splits your sound into two bands -- high and low. The
crossover frequency is set by the rear panel control and sets the frequency at which your
sound will be sent to the low output or the high output. This feature is used with bi-
amplification systems where high range and low range speaker cabinets, such as the ADA
Bassline HX and Bassline 15, are each driven by separate power amplifiers or by a two
channel power amplifier, such as the ADA B500B.
Low Frequency Limiter
Loudspeakers can be damaged by sending them too much power. Most of the power in a
bass guitar is in the low frequencies. When using a bi-amp system it is often desirable to limit
the maximum power sent to the low frequency cabinet. The Low Frequency Limiter allows
you to set the maximum amount of signal that will be sent to the low frequency cabinet when
the MB-1 is used with a bi-amp system. It has no effect on the high, full range or balanced
direct outputs. It is manually set by the rear panel control. A rear panel bypass switch
removes the Low Frequency Limiter from the signal path.
Balanced Direct Output
A Balanced Direct Output is provided for when using the MB-1 in a studio, or for live
performances where a direct feed to the mixing board is desired. The Direct output is
switchable between Pre and Post settings.
When set to the Pre position, the Direct output is at instrument level and is the unmodified
sound coming directly from your bass guitar pickup(s). In this position the MB-1 is effectively
out of the signal path and none of the programs you select will have any effect on your tone.
When set to the Post position, the Direct output is at line level and the signal you get is the
tone you set up with the MB-1 program you have selected. This is the same signal that
comes from the single ended full range output, only in a balanced form.
A rear panel pin 1 ground lift switch is provided for ground loop hum elimination if necessary.
Parameters and Programs
The parameter values that define your tone are held in a set of working registers while you
are playing or editing. These values together are called a program and can be assigned a
program number 1 to 256. The current program in the working registers is replaced by
whatever program you next select, so once you have the parameter values that give the tone
you want, you have to save it or it will be lost.
All 256 user programs and all 79 factory preset programs may be selected directly from the
front panel. From MIDI In, however, you can only select 128 program numbers. To solve this
problem, and to provide enhanced compatibility with other MIDI devices, there is a MIDI Map
function.
The MIDI Map function allows anyone of the 128 MIDI program change codes to select
anyone of the 256 user programs. The 79 factory preset programs are not directly accessible
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