Hi Chris,

Thank you for your message.

Unfortunately there is no way to reduce the wattage, its a case of playing with each preset, make sure you check the gate within each preset.

Regards

Team Marshall

Whilst you can't reduce the wattage you can at try reducing the Volume and then control with the Master. The gain might be an option as well. A number of people have suggested that the 50 can be used at bedroom levels its just a question of reducing the levels and still controlling from the guitar volume as desired.

I can definitely vouch for the 25 though its a very good sound in my music room (dining room conversion) and its damn loud if I want it. check out the marshall forums (marshallforum.com) there are a number of popele on there playing with 25's and 50's.

Same issue for me - I've just finished going through ALL the presets, reducing the preset volume to something decent that matches with the levels coming through Bluetooth Audio, and I can now use the Master Volume comfortably at the lower end.  I'm sure there'll be some fine tuning to come, but I had to dial everything down to between a quarter and a third of the original volume - yes, the 50 is LOUD!!  I don't remember ever getting these volumes from my 30 year old 65W Laney.

You CAN reduce the wattge. The amp is rated at 50 watts into 4 ohms. An 8 ohm speaker will reduce output to 25w. A 16 ohm will reduce it to 12.5w. Unlike tubes, increasing impedance against a solid state amp will not affect it's reliability, it will simply reduce it's output power. That said, you now need to consider sensitivity of the replacement speaker. A speaker rated at 95db @ 1watt/1 meter will produce 98db at 2 watts, 101db at 4 watts, 104db at 8 watts, and 107db at 16 watts. So at 12.5 watts your max level will be ~105.5db. I'm not sure what the sensitivity is for the stock speaker so I do not know max SPL for the stock amp.