I have an Epiphone Viola Bass, a Yamaha TRB5II Bass, a Zoom Bass Effects, a Berringher Microphone and I plug all these into my MS400 through a Berringher Mixer consul.

The MS400 takes all this without any worry. The Bass guitars are clear for both acoustic and punchy sounds. I have compared the MS400 against Bass amp heads and combos such as Fender, Ampeg, SWR and Trace Elliot, but only Trace Elliot comes close.

The acoustic guitar sound is genuinely acoustic and the vocals are clear.

I turn the volume on the MS400 on full and adjust each instrument via the mixer and I have never had any hum or noise problems.

Yamaha after sales assistance is excellent.

My only reserve is that Yamaha have not designed a travel case for the MS400. Eventhough they advertise the MS400 as a sturdy speaker cabinet, a case is advisable to protect the speaker's appearance.

Construction	100%
(Very solid and easy to carry. Very lightweight and versatile)
Clarity	100%
(Perfect sound clarity. Bass sounds like bass and acoustics sound acoustic.)
Volume	100%
(Easy to operate. Good clarity at all levels.)
Customer Service	100%
(Never really had to use them for anything other than to answer questions. Wi
th this, they were always prompt and willing to assist. They also made it cle
ar that they were interested in providing me with a product that I needed and
not just a sales pitch.)
Value	100%
(Compared to similar amplifying systems, this is a steal.)
Overall	98%
(100% if it had a protective travel cover.)