FRONT PANEL (CONTROLS & FEATURES)
INPUT JACK
This jack is the instrument INPUT that feeds the first stage monolithic J-FET buffer amp of the SUBWAY D-800.
The input sensitivity of this input buffer amp is adjustable with the ACTIVE/PASSIVE switch, the ACTIVE position being about 10dB
less sensitive (lower gain) than the PASSIVE position.
MUTE SWITCH
This switch (and its associated red indicator LED) mutes the audio signal being sent to the DIRECT OUTPUT
and SPEAKER OUTPUT for silent tuning with a tuner connected to the instrument cable and then through to the amp. When the
switch is in the up position, the red LED will illuminate and NO audio will be present at the DIRECT OUTPUT jack, HEADPHONE
jack or the SPEAKER OUTPUT jack. This switch can also be used to place the amp into standby mode before and between sets
without adjusting any of the controls.
ACTIVE/PASSIVE SWITCH
This switch (and its associated blue indicator LED) sets the sensitivity of the J-FET input buffer.
Often (though not always), an active bass may have a signal level up to 10dB greater than a typical passive bass. If you find that
you are operating the gain control near the low end of the control’s rotation in order to prevent the O/L LED from flashing, switching
this switch up (into the ACTIVE position) will reduce the input sensitivity (gain) by ~10dB, allowing greater control range and freedom
from overload with high output active basses.
DEEP SWITCH
This switch (and its associated blue indicator LED) engages the DEEP filter, our take on classic low frequency
response enhancement and extension. When engaged, there is a mild boost in the very low frequency response while also lowering
the effective high pass filter frequency. This combination brings a more round, thicker, fatter response to the bottom end. When using
with small (compact style) cabinets, be aware of the possibility of damage due to overpowering at higher volumes.
INTERNAL HIGH PASS FILTER
While not a visible switch or control, it is an important internal feature in maintaining control
over the extreme low end, especially under high drive conditions. This precision 4-Pole filter has a turnover frequency that is set at
approximately 30Hz with maximally flat, no ripple response. While HPF’s have been standard fare within the pro audio industry for
decades, this feature has only appeared in bass guitar amplifiers within the past few years (with a few notable exceptions). This filter
also provides additional mechanical protection to the speakers by limiting the power to the speaker below the frequency range that
the speaker cabinet cannot provide adequate acoustic loading to the drivers. This is one of the primary (and preventable) causes of
premature speaker failure, especially with compact speaker cabinet products.
INPUT CONTROL (GAIN) & O/D LED
The INPUT control determines the input gain of the first gain stage and thus the
level that the following electronics stages operate at. Overdriving the input gain stage may be a desirable tonal characteristic of your
playing style, the amber O/D LED provides a visual indication of the status of the drive signal level and how much preamp overdrive
is being achieved. When using significant overdriven tones, you may find it helpful to back down on the TREBLE EQ a little bit to
reduce harshness and also to reduce the BASS EQ to increase the clarity and impact.
INPUT
INPUT VOICING BASS
LOW MID HIGH MID TREBLE MASTER
PASSIVE
ACTIVE
O/D
FLAT BOOST
ON
DEEP
POWER
PROTECT
LIMIT
PLAY
MUTE
™
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