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GSS Twin Sumo stereo bass & guitar power amp

Shopping Satisfaction
Guitar Sound Systems
(Code: A0035)
In Stock
(1 Item(s) In Stock)
Compact & light weight guitar & bass Stereo Power Amp
Flat frequency response
Hifi sound
2 x 300W 8 Ohms / 2 x 600W 4 Ohms
669.90 €
599.90 €
*If you place your order before 12:00 noon CET (Monday to Friday) your order will leave on the same day
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Unique size vs. power ratio.
Very high quality electronics based on carefully selected components.

  1. Black steel and aluminium (front and back panels) enclosure. Laser printed front and back panels.

    Aluminium structure transport case included.

    This product can be modified upon request to work over 120V supply:
    Please add "Please ship 120V version" in the comment section while entering your order online and please allow 48 hours prior to shipment for us to modify your purchased product accordingly.
    FCC test reports are currently not available yet. All shipments to the US are under sole reponsibility of the buyer.

    All products shipping to the UK ship with a UK 3 prong power cord.
    All products shipping to North America ship with a US power cord.

  2. Inputs/outputs and controls :
    Two 1/4" (6,35mm) input jack connectors on the front panel.
    Two Neutrik Speakon loudspeaker output connectors on the back panel.
    One on/off power switch. Massive pure aluminium volume control.

  3. Poids : 5.07 Lbs. ( 2,5 Kg )

    Dimensions : 3.2" x 5.5" x 10" / 8 x 13 x 26 centimeters (Height x Width x Depth)

  4. Power: 2 x 600 Watts over 4 Ohms; 2x 300 Watts over 8 Ohms; 2x 150 Watts over 16 Ohms.

    THD (at full power): < 0,1 %

    Input impedance: 10 K Ohms

    Power voltage: 180-264 Volt ac

    Frequency response (-1dB): 20-20000 Hz

free return
* within 14 days from purchase order entry
2 year warranty
* see General Terms & Conditions
Customer reviews
Shopping Satisfaction
This amp is wonderful. Able to power my stereo 2x12 with ease. Very clear and transparent. The size of the unit is perfect and can fit into my rack with ease. A very slick look and very simple which I love. Currently getting a video together for the people at GSS so that more people can see how great this product is. Stoked to be a user of GSS products!
Ben H.
Shopping Satisfaction
It's a fantastic amplifier, heavy enough to be reassuring without being cumbersome, really quiet in use, even when turned up loud.

It's great having the flexibility to run it either as a stereo amp, or a single channel amp and not have to worry about needing a load connected to the other output.

The sound is really clean, very full, especially with a valve preamp in front of it, but unlike some power amps I've tried, it doesn't seem to be lacking in the mids. Overall it's excellent.
Rob D.