Test recorded on october 2002 at Rock Center Music Store. I used two guitars: a Fender Squier Strat and a PRS Singlecut.

Clean Channel:
Using the single coils on the Squier it sounded very clear and dynamic, it reacted very well to the different picking nuances and intensities. It reminded me of a good JC120 Jazz Chorus. I was surprised by the low end this clean channel has. The reverb is excellent and sounded very tridimentional and filled the room with a pleasant tone. The eq controls, while interactive like a good passive design, have an extended range. I perceived a slight compression when using the PRS on this channel, since this guitar has a pair of humbuckers...that reminded me of a good tube amp.

Boost Channel:
This channel is very versatile since apart from the usual eq controls it has a "contour" knob that allows you to shift the mids, thus opening up the door for multiple tones. You can go from Satriani to Dimebag darrell at the turn of a knob here...you can get a tremendous scooped tone or a flutey, singing tone very easily. This channel has the Metal name written all over it, but if you order this amp with the B1 speaker option you'll be able to get very close to an SRV tone by setting the gain very low and using a Tubescreamer.

Speaker:
The GTS90 amps can be ordered with two different speakers, called A1 and B2.
The A1 is a clean sounding speaker reminiscent of a JBL or EV. its tone is bright and has a solid low end, ideal for clean tones and extreme distortion.
The B2 is a more "vintage" sounding speaker reminiscent of a Celestion G12. I would recommend this type if you're after a bluesy tone. Overall these two kind of speakers cover the whole tonal range this amp may deliver.

Overall, a very versatile amp, very well constructed and at a price point that puts it into a very hard to beat, well deserved place.

Ariel Pozzo