Abstract: A speaker cabinet including at least one bass speaker having a voice coil aligned by a magnetic fluid without a ‘spider’ and having an anodised metal cone, and at least one further speaker having a thin conductive membrane, and having integrated preamplifiers and at least one power amplifier, for use with musical instruments, for playing small to medium sized venues and/or for use as a personal monitor speaker on a performance stage for playing medium to large venues. Multiple channels are provided to amplify more than one instrument, and microphone inputs are provided for acoustic instruments and/or voice amplification. A line level input is also provided for external signal sources. An auxiliary input is provided to facilitate the monitoring of accompanying musicians, thus permitting the loudspeaker system to also function as a stage monitor. Reverberation and notch filtering, as well as tone control, may also be provided.