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Darkglass M500 Microtubes 500 Watt v2 Bass Amplifier

Darkglass M500 Microtubes 500 Watt v2 Bass Amplifier
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The Microtubes 500 is a 500W amplifier equipped with an all analog solid state preamplifier and a Class D Power Module.

On the top row, you will find the clean section which is the foundation of your tone. It features a Gain control and an active 4 band EQ: along with Low and Treble controls, you will find Low Mids and Hi Mids controls, each knob with their own 2-way frequency switch.

On the bottom row, you will find the Microtubes Engine®, an extra channel that will bring your clean tone to the next level by helping you cut through the mix while adding anything from subtle, tube-like, harmonics and natural compression to obliterating distortion. 


Speaker Output

Connects the amplifier to your cabinet. This Speakon combo jack allows for either Speakon or ¼” speaker cable operation. The minimum load for the amplifier is 4Ω. For higher impedance loads the maximum output power is reduced. The Microtubes 500 amplifier can run without a cabinet connected to this output.

WARNING: Do not use an instrument cable with this jack. Using an instrument cable can damage your amplifier. Do not use a load lower than 4Ω.

Headphone Output

Headphones with 1⁄4” plug connector can be connected to this jack. For quiet operation remove any speaker cabinet connected to the amplifier, as connecting the headphones does not disable the speaker output.


Line level effects loop output. Connect a cable from this jack to the input of any pedals used in the effects loop. The output can be used to connect to another power amplifier or a sound card. The output is not controlled by the Master volume. Gain control can be used to change the signal le


Line level effects loop input. Connect the output from your effects loop pedals to this connector.


Selects which signal will be sent to the Balanced output. Selecting PRE, sends a clean copy of your input bass signal. Selecting POST delivers the processed signal by the preamplifier (Microtubes Engine, gain, eq.)

Ground Lift

Lifts the ground of the Balanced output. If you are hearing mains frequency hum in your setup, try changing this setting.

Balanced Output

Connects the Microtubes 500 preamplifier to balanced equipment (mic preamp, console, recorder, compressor, audio interface, etc.) via a standard XLR connector. The balanced signal level is not affected by the Master volume.


The fan cools the amplifier and should run at all times. Be sure to never cover the vent holes on either side of the chassis.

AC Socket

Connects the power cord to the amplifier.

AC Power On/Off

Turns the amplifier on or off.