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4. Tone Controls
The four overlapping tone controls cover the entire audio spectrum and permit a wide range
of sonic adjustment. Each tone control has a range of ±15 db. The center position denotes a
neutral or nominal setting. The Bass control adjusts the level of the low frequency; Low Mid,
the next frequency range up). Hi Mid covers a higher frequency range and the Treble control
regulates the upper frequency range.
User Tip: When starting out, it’s a good idea to center all tone controls. Adjust these controls
while playing until you achieve the desired tone. Keep in mind that all tone and EQ circuits are
gain-related, which means it may be necessary to re-adjust the Gain control once the desired
tone is achieved. This will help you to retain the amount of clarity or ‘growl’ you desire.
5. Scoop Control
The Scoop modifies the tone of the bass by reducing the gain throughout the mid frequencies
around 400 Hz while slightly boosting the low and high-frequency gain. By re-shaping the
frequency response in this manner, the Scoop provides an expanded tonal palette.
User Tip: The Scoop’s midrange dip is actually at maximum with the control set at “0”. There
is no midrange response dip with Scoop set on “10” thus, if you prefer a more note-defined
sound, use a higher Scoop setting. The lower settings would be for a deeper, more bass-
heavy sound. Additional Gain and/or adjustments to the Master volume may be needed.
6. Master Volume Control
The Master volume adjusts the overall signal level of the amplifier. Consider it your
“loudness” control.
7. Limiter In/Out Button
This feature activates a signal limiter circuit on the input of the DynaBass 300’s power amp.
In order to prevent hard clipping of the power amplifier and preserve speaker life, depress
the Limiter button.
8. Line Out Button
This feature routes the preamp signal destined for the balanced Line Out XLR either through
the amp’s tone control and Scoop circuits, or around them. Depress the button (Post-EQ setting)
to have the same sound as your amp going to the PA or recording mixer, or leave it in the out
position (Pre-EQ setting) to send the instrument’s original, non-EQ’d signal to the board.
9. Tuner Jack
Connect your instrument tuner here using a standard shielded (e.g. guitar) cable.
10. Phones Jack
Connect headphones here for practicing or recording. When you plug phones in, you mute the
amplifier’s speakers, however the XLR Line Out, Tuner jack and Efx Send jack will still work.
11. Line Out XLR and Lift/GND Button
This output allows the user to connect the DynaBass 300’s preamp directly to a mixing console
when performing live or recording in the studio. Use a standard XLR mic cable or an XLR
female to a 1/4-inch TRS patch cable depending on the mixer’s available inputs (it is usually
best to use a 1/4-inch TRS line-level input on the board to match gain levels). In the Lift setting,
the button disconnects Pin 1 of the XLR to help reduce ground loop hum when routing signals
directly to other equipment or mixing consoles. However if ground loop hum is not audible, you
may get superior shielding from outside noise sources with the button in the GND setting.
User Tip: When using the XLR Line out for recording direct-to-computer, we would recommend
you insert a suitable device between the amp and computer such as A.R.T.’s TubeMP with
USB for extra gain control and USB conversion.
