The THR100HD is essentially two complete amplifiers in one head-shell. sold as set only, with an identical feature set and control panel consisting of an amp model selector with five models, switchable booster with a level dial, gain, master, three band EQ, presence, reverb and volume controls. The amps can be considered as a standard two channel format, or can be used in a number of innovative ways thanks to individual inputs and outputs for each amp. This is literally two complete amplifiers in one head, offering the possibility to use two guitars and two cabs, one assigned to each amp, or a single guitar with two cabs, or a single guitar with one cab in stereo or mono. Even more impressive is the fact that both amps can be used at the same time in parallel using the I+II mode, for an insane number of possible tonal outcomes, combining two cleans, clean and dirty sounds or two dirty sounds, with individual effects loops (via TRS cables) for each amp providing even more possibilities. Some of the greatest tones ever played on a guitar consist of two amps running in parallel and Yamaha is giving users this possibility at a massively reduced cost and footprint.

The THRC212 closed back cab features a pair of deliberately mismatched Eminence 'The Legend' and 'The Tonker' 12” drivers with selectable mono or stereo operation, allowing each amp to be used with an individual speaker or through both. This allows for even more tonal customisation and stereo operation through a single cab. The cab is very well made and sounds great, making it the ideal combination for the THR100HD.

The back panel provides all of your usual speaker outputs and a switchable output section for lowering the volume to 50W and 25W mode as required. Yamaha has gone a stage further with the VCM modelling on the THR100HD, offering a selection of output tube selections - namely EL84, EL34, 6L6, 6v6 and KT88’s plus switchable Class A and Class AB operation, via the back panel. These selections can be made individually for each amplifier for a truly mind blowing number of tonal and dynamic responses, the only downside being that none of these selections can be stored as a preset - a strange omission given the number of possibilities on offer. One can only assume that this was in order to keep the amp as simple to operate and as affordable as possible, but it will be missed by many.