Front Panel Features

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 to distort early (feel free to use if such additional distortion is desired).

Microtubes
Use this push button to turn 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).

Compression
This knob controls the amount of dynamic compression added to the Microtubes Engine.

The make up gain is adjusted automatically. The compression can be turn off or assigned using the Darkglass Suite.

Drive
This knob controls the amount of distortion that the Microtubes Engine will deliver. It will change from a soft warm overdrive to a massive modern distortion sound.

Tone
This knob 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, especially handy if already running bright clean EQ setting or cabinets with tweeters.

Level
Use this knob to control Microtubes Engine’s output volume.

Blend
Use this knob to mix between the Clean signal and the Distortion signal (Microtubes Engine).

B3K/VMT
This push-button switch 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
Use this knob to change the volume of the signal before the Active 4 Band EQ. You can set it low for ensuring the cleanest operation possible or set it higher for more aggressive growl.

Bass
+-12dB at 80Hz. Use this knob to change the low content of the signal.

Mids
+-12dB at 250, 500,1.5K and 3Khz. This graphic eq control the mid content of the signal.

Treble
+-12dB at 5kHz. Use this knob to change the high content of the signal.

Master
Use this knob to control the overall volume of the amplifier.

Mute
Use this push button to mute the amplifier.

DIMENSIONS
26.7cm l x 7cm h 25.5 w (10.5”l x 2.75”h x 10”w) / Weight: 2.9Kg (6.39Lbs)

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

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

· The Microtubes 900v2 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 900v2 can deliver more than 900 Watts. Be sure that your speaker cabinet is able to deliver 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 damage the power amp by overheating it.

· Don’t use an instrument cable as speaker cable. An instrument cable is not designed to deliver the type of power signals sent from the amplifier to the speaker.

Back Panel Features

Speaker Output
Use this connector to connect the amplifier to your cabinet. This Speakon combo jack allows for either Speakon or ¼” speaker cable operation. The outputs are connected in parallel.

WARNING: Do not use an instrument cable with this jack. Using an instrument cable can damage your amplifier.

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

Pre Amp Out
You can use this output to connect the preamp to a different power amp.

Power Amp In
You can use this input to connect a different preamp in the power amp. (master volume will be disabled)

Ground Lift
Use this control to lift the ground of the DI XLR output. If you are experiencing ground noise in your DI signal try changing the setting of this control.

Pre DI Output
Use this connector to send a balanced copy of your clean signal to the console, mic preamp, interface, etc.

Post DI Output
Use this connector to connect the Microtubes 900 preamplifier to balanced equipment (mic preamp, console, recorder, compressor, audio interface, etc.) via a standard XLR jack. Using this connection you have a signal processed by the preamp of the amp (gain, distortion, eq, master, etc.)

USB
The USB connector allows you to use the Darkglass Suite to load different cabinet impulses or change different parameters on your amp (midi, compressor, etc)

Headphone Output
Connect your Headphones and enjoy the impulse based cabinet emulation.

Headphone Volume
This knob controls the volume of the headphone output.

Aux In
Use this connector to provide to the Headphone output music from your laptop, cellphone, mp3 player, etc.

Cabinet Select
Use this switch to navigate between the 3 different cabinet impulses or the raw sound of your amp.

MIDI
The midi input allow you to control the channels of the amp via a midi standard controller.

Footswitch
The Intelligent Footswitch is proprietary digitally controlled device that allows you to remotely engage and disengage the Microtubes Engine. You can also hold the footswitch to Mute the amplifier. The VMT/B3K push button will remain operational with the Intelligent Footswitch plugged in.

· You can use a regular mono instrument cable to connect the amplifier to the footswitch.

· You must remove the cable from the footswitch jack in the rear panel if you want to control the amp from the front panel.

AC Socket
Use this connector to feed electric power to the amplifier. 100 - 230 VAC, 50Hz-60.

AC Power ON/OFF
Use this Switch to release the audio energy from your bass.