Darkglass Electronics Microtubes X 900 User manual

Microtubes X 900 Manual – Darkglass Electronics
https://www.darkglass.com/microtubes-x-900-manual/[2/15/2024 11:11:09 AM]
Specs
Controls
Input: Use this jack to connect your instrument via a standard ¼” mono
cable.
Passive/Active: Use this push-button switch to change from passive to
active mode. If your bass is active it can have a hotter signal, making the
amp distort earlier (feel free to use if such additional distortion is desired).
X: Use this push-button to turn on or off the Microtubes X Engine which
allows you to compress and distort your bass signal in two separate bands,
solidifying the clean low end and distorting the highs to taste from
articulate to aggressive. The Microtubes X Engine operates before the EQ
section.
Clean Comp: Use this push-button switch to activate the compressor
circuit for the clean channel.
Vol (Clean Comp): Sets the level of the clean channel when the
compressor is engaged.
HPF (High Pass Filter): Controls the cutoff frequency of the high pass
filter which is applied before the clean signal is fed to the distortion
circuit. Ranging from 100 Hz (for thicker, fuzzier saturation) to 1 kHz (for
ultra-sharp definition).
Specs
Block Diagram
Warning
Warranty
Microtubes X 900 Manual
900W Bass Amplifier

Microtubes X 900 Manual – Darkglass Electronics
https://www.darkglass.com/microtubes-x-900-manual/[2/15/2024 11:11:09 AM]
Drive: Sets the amount of distortion for the high pass side.
Mix: Controls the blend between the compressed lows and the distorted
highs.
LPF (Low Pass Filter): Controls the cut-off frequency of the low pass
filter which is applied before the clean signal is fed to the compression
circuit. Ranging from 50 Hz (for only sub-bass) to 500 Hz (to preserve
some clean mids).
Comp: Controls the amount of compression for the low band when X is
activated. Both threshold and makeup gain are controlled to maintain a
constant level. This control is also used to control the amount of
compression when the compressor is enabled for the clean signal. The
clean comp is full-range.
Level: Sets the output volume of the X channel.
Bass: +-12 dB @ 80 Hz.
Mids: +-12 dB at 250, 500, 1.5k and 3 kHz.
Treble: +-12 dB @ 3 kHz.
Master: Sets the overall volume of the unit.
Mute: Use this push-button to mute the amplifier.
Technical Specifications
Input Impedance: 1.1 MΩ
Minimum Load Impedance: 2.5 Ω
Maximum Power Output: 900 W RMS @ 4 Ω(1 kHz full blast, 2 min.
max) 20% THD, 450 W RMS @ 8 Ω
Power Amp Input (Return) Impedance: 100 kΩ
Power Amp Input (Return) Level: 2 Vrms (max before 1% THD)
Pre-Amp Output (Send) Impedance: 1 kΩ
Pre-Amp Output (Send) Level (max): 2.2 Vrms (max before 1%
THD)
Maximum Power Consumption: approx. 700 VA
Cooling: Forced-air cooled
AC Input Power: 100-250 VAC
AC Frequency: 50/60 Hz
Dimensions
Width: 26.7 cm / 10.5″
Length: 25.5 cm/ 10″

Microtubes X 900 Manual – Darkglass Electronics
https://www.darkglass.com/microtubes-x-900-manual/[2/15/2024 11:11:09 AM]
Height: 7 cm / 2.75″
Weight: 2.9 kg / 6.39 lb
Block Diagram
Warning
No user serviceable parts inside the amplifier. Do not open the amp.
Never use the amp in a high moisture environment or near liquids.
The Microtubes X 900 can deliver more than 115 dB of power. Exposure
to this level of sound can damage your hearing. Use proper hearing

Microtubes X 900 Manual – Darkglass Electronics
https://www.darkglass.com/microtubes-x-900-manual/[2/15/2024 11:11:09 AM]
protection if you will be exposed.
The Microtubes X 900 can deliver more than 900 W RMS with a 4 Ω
load. Be sure that your speaker cabinet is able to deliver that power.
Do not cover the vent holes. The fan and vent holes are part of the cooling
system of the amp. Covering the vent holes can damage the power amp by
overheating it.
Don’t use an instrument cable as a speaker cable. An instrument cable is
not designed to deliver the type of power signals sent from the amplifier
to the speaker.
Troubleshooting
The button controls do not react: check if the footswitch is connected.
If you do not want to use the footswitch, you have to unplug the cable
from the rear panel of the amp.
The amp does not turn on: check if the power cable is connected and if
you have power from the wall.
The sound is low: check your speaker cable. Never use an instrument
cable.
The sound is distorted or too high: check if the passive/active switch
matches your bass.
Warranty
Please register for your warranty at http://mypedal.darkglass.com. The
Microtubes X 900 is under warranty to the original owner for a period of two
years against manufacturing defects in the country where the product was
originally purchased.
If you experience a problem with the unit, please contact
[email protected] to receive a Return Authorization number or for
information on the nearest authorized repair center. A copy of your original
receipt must be included with all warranty repairs. You are responsible for all
shipping charges. The unit must be shipped to us freight prepaid. We will
return the unit freight collect.
Darkglass Electronics Oy is not responsible for shipping damage either to or
from our service center. Claims must be filed with the carrier.
Darkglass® and Microtubes® are registered trademarks of Darkglass

Microtubes X 900 Manual – Darkglass Electronics
https://www.darkglass.com/microtubes-x-900-manual/[2/15/2024 11:11:09 AM]
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