Portability, flexibility, and performance represent the spirit of our first breakthrough in the amplification world. The distinctive sound comes from the unique Microtubes Engine, a technology developed by Darkglass to accomplish the highest expectations of any bass player.

Illustrated by the amazing artist Christopher Lovell, "Medusa" is one of the most epic, dark artwork we have seen in the past few years.

Front Panel Features

Input

Connect your instrument via a standard ¼” mono cable.

Passive/Active

Switch from passive to active mode. Some active basses can have a hotter signal output which can make the amp distort early (feel free to use it on Passive move even with active basses if such additional distortion is desired).

Microtubes

Turns on or off the Microtubes Engine to add natural compression, organic harmonic enhancement, and saturation ranging from mild overdrive to high gain bass rage.
The Microtubes Engine operates before the clean section (you can therefore use the 4 Band Active EQ for additional tone shaping in addition to the Tone knob described below).

Drive

Controls the amount of distortion that the Microtubes Engine will deliver. It will change from a soft warm overdrive to a massive modern distorted tone.

Tone

Controls the high harmonic content of the Microtubes Engine via a variable low pass filter: crank it up for additional attack and definition or dim it down for a smoother sound. This is handy if running bright clean EQ settings or cabinets with tweeters.

Level

Controls the Microtubes Engine’s output volume.

Blend

Mixes between the Clean signal and the Distortion signal (Microtubes Engine).

B3K/VMT

Selects between two overdrive voicings: B3K mode will deliver an aggressive, percussive sound while the VMT will bring up the mids for a warmer, more neutral character.

Gain

Changes the volume of the signal the Active 4 Band EQ. You can set it low prior to ensuring the cleanest operation possible or set it higher for more aggressive growl.

Bass

+-12dB at 80Hz. Changes the low content of the signal.

Low Mids

+-12dB of the selected frequency via the LOW MIDS ƒ switch (described below). Changes the lower mid content of the signal.

Low Mids ƒ

Use this switch to change the frequency of the low mid band from 250Hz, 500Hz or 1kHZ.

Hi Mids

+-12dB of the selected frequency via the HI MIDS ƒ switch (described below). Changes the higher mid content of the signal.

Hi Mids ƒ

Use this switch to change the frequency of the hi mid band from 750Hz, 1.5kHz and 3kHZ.

Treble

+-12dB at 5kHz. Changes the high content of the signal.

Master

Controls the overall volume of the amplifier.

Mute

Mutes the amplifier.

DIMENSIONS

23.2x19x7.3 mm (9.13x7.48x2.87 in)

WARNING

Do not open the amp. No user serviceable parts inside the amplifier.

Make sure the voltage selector switch on the left side panel is set properly (115V/230V) before plugging the amplifier on the AC outlet.

Never use the amp at a high moisture environment or near liquids.

The Microtubes 900 can deliver more than 115 db of power. Exposure to this level of sound can damage your hearing. Use proper hearing protection if you will be exposed.

The Microtubes 900 can deliver more than 900 Watts. Be sure that your speaker cabinet is able to handle that power. You can reduce the output of the amp by selecting the 2Ω mode on the rear panel (by the Speakon output jack).

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 produce overheating of the power amp damaging it.

Do not use an instrument cable as speaker cable. An Instrument cables are not design to deliver power signals going from the amplifier to the speaker.

Back Panel Features

Speaker Output

Connects the amplifier to your cabinet. This Speakon combo jack allows for either Speakon or ¼” speaker cable operation.
*WARNING: Do not use an instrument cable with this jack. Using an instrument cable can damage your amplifier.

Min-Load

Press when using a 2Ω load. You can use this control to lower the output if your 4Ω cabinet is not able to handle more than 500W (you can also get 350W with an 8Ω cabinet in this configuration).

Pre Amp Out

This output connects the preamp to a different power amp.

Power Amp In

This output connects the preamp to a different power amp.

Post-Pre

Selects what signal will be delivered by the DI output. Selecting PRE, sends a clean copy of your input bass signal. Selecting POST delivers a signal processed by the preamp of the amp (gain, distortion, eq, master, etc.)

Ground Lift

Lifts the ground of the DI XLR output. If a ground noise in you DI signal is experienced, try changing the setting of this control.

Balanced Output

Connects the Microtubes 900™ preamplifier to balanced equipment (mic preamp, console, recorder, compressor, audio interface, etc.) via a standard XLR jack.

Footswitch

The Footswitch allows you to remotely engage and disengage the Microtubes Engine. Hold the footswitch to Mute the amplifier. The VMT/B3K push button will remain operational with the Intelligent Footswitch plugged in.
* Use a regular mono instrument cable to connect the amplifier to the footswitch.
* Remove the cable from the footswitch jack in the rear panel if you want to control the amp from the front panel.
* The Microtubes 900™ will only work with our proprietary Intelligent Footswitch (included with the amplifier). A generic Footswitch will not work with the Microtubes 900.

AC Socket

Connects the power cord to the amplifier.

AC Power ON/OFF

Turns the amplifier on or off.

Darkglass Microtubes 900 Limited Edition