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7.8 DAC Adjustment Installation
It may also be necessary to install a DAC adjust trimpot to decrease DAC noise. The
components required are a 250K trimpot (R43), 2 200K resistors (R20 and R44), and a 1M resistor
(R45). See diagram 8 for locations.*
7.9 Increasing Output Gain
It may be necessary to change the gain of the output stage to accommodate the users of
some amplifier effects loops. To do this, change R11, and R12, to a value between 4.7K and 10K
(the larger the value, the higher the gain).*
* - The application of these items are left to the discretion of the technician.
7.10 QV I/P Filter Kit Installation
The following update enhances the input filter of the Quadraverb by increasing the number of
filter poles from 4 to 6. This gives a corresponding increase in the filter rolloff rate, and eliminates
problems encountered when using the QV with high bandwidth samplers such as the Ensoniq ESQ-
1, the Roland D-50, or the EMU Proteus.
Here is a list of components that will be changed or added:
Component
* R16
R19
R23
R24
R25
* R26
* RA
* RB
R42a
C35
C36
C42
C43
C44
* CA
* CB
**R20
**R44
**R45
**R43
* Requires special installation, see below.
** Recommended, but not necessary.
Alesis QuadraVerb Service Manual------
New Value
9.1K
4.3K
680R
2.4K
27K
33K
-------
-------
-------
47pF
.033uF
1500pF
.033uF
100pF
-------
-------
-------
-------
-------
-------
Added
Diagram
-------
-------
-------
-------
-------
-------
3.6K
1.3K
750R
-------
-------
-------
-------
-------
3300pF
.01uF
200K
200K
1M
250Ktrm
8
7
7
7
7
7
7
7
7
8
7
7
7
7
7
7
7
8
8
8
8
08/13/04
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