MK4 STUFFED THING

MK4 STUFFED THING

Portable Battery powered PA system ideally suited to Street Performers, Theatre Companies, Arts Events, Festivals, Bands and Individuals

Please contact me for a full list of options, an order form and current prices. All PA’s are built to order to your individual requirements.

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This model has been designed as a very easily portable PA system for professional use, with huge power and sound quality, and it has been designed and built to conform to the CAA regulations of approved aircraft hand luggage, however you should always check with your airline as regulations can change.  It differs from the Mk2 version in that it is slightly larger, louder, has a ‘fuller’ sound and is heavier. This all makes it more suitable for those people who don’t need the smallest and lightest PA possible, but want something that is genuinely portable – unlike many other allegedly portable systems that are the size of large suitcases, or are mains powered.

These systems are quite simply jaw droppingly impressive for their size and weight. Whatever small PA systems you have heard before they will not compare to this, and many mains powered, large and expensive systems can be put to shame. This sound quality has only been possible with many years of research and design, in conjunction with great electronic engineering knowledge and skilled craftsmanship – you will not find anything similar anywhere on sale today. It has been entirely hand built in England with very high quality components sourced from all over the world.

At the heart of the PA's is a ‘Class T’ amplifier chip (sometimes called digital although it isn’t really) made by a company called Tripath. Tripath are no longer in existence, but before they disappeared they designed and patented a range of amplifier chips that many small audiophile manufactures have used for various applications - Google them. Panasonic used the same amplifier chip in a range of car stereos which broke the world record for the highest power output from a standard production car stereo. Wattage figures are almost meaningless as it depends on what you do with the power, what it costs to create it in the first place, how distorted the sound is, and are the figures even accurate ! (Wattage figures are notoriously lied about, as well as being measured at RMS and peak levels) …however this system has been measured at 150 Watts RMS at ‹ 1% distortion.It should be enough to say it is very loud and louder than you would think possible from such small boxes.

Current Mk4 standard models have :

  • Two speaker units (Stuffed and Thing)
  • 5 meters of cable as standard (more or less can be supplied)
  • Preamp for high power output from low level input devices such as iPods
  • Volume / gain control
  • Automatic anti-clipping circuit to detect and reduce sound distortion
  • 80 Hz high pass filter to reduce sound distortion
  • Overload flashing LED (identifies clipping /distortion)
  • Fold flat carry handles
  • Aluminium Speaker Grills
  • 2 x Screw lockable 3.5mm jack inputs (eliminate crackle / noise due to poor connections)
  • 1 x stereo screw locking 3.5mm input cable
  • External power input socket to power from external battery or other power supplies.(12~24v DC)
  • Removable ‘flying lead’ for Thing
  • Power on ultra-bright blue LED
  • Battery LED meter
  • Internal aluminium bracing
  • Aperiodic enclosure venting system
  • 4 hour Mascot smart charger 100~240 V mains with UK plug (other plugs can be supplied)
  • 2 position rubber feet


  • Additional options are :

  • 3rd 3.5mm jack input socket
  • Power output socket and cable to power external equipment from the internal PA battery
  • Microphone pre-amplifier for use with most types of hand held microphones  (not required for wireless mic systems)
  • Canvas shoulder bags with acoustically transparent fabric panel
  • Stereo screw locking 3.5mm input cable
  • Screw locking 3.5mm stereo to double mono input converter cable (particularly useful when using ‘Stuffed’ on its own or for converting stereo signals to mono when using both speakers)
  • Screw locking 3.5mm Radio mic input cable
  • Speaker cable extensions for ‘Thing’
  • Custom cables


  • Specifications :

  • Amplifier : T-Class (audiophile sound quality)
  • Speakers : 3way  6” x 9” 3 ohm woven fibreglass cone
  • Sensitivity (2.83V, 1m) : 94dB
  • Battery : 22.5v, 4.4Ah, Li-ion rechargeable
  • Size (approx ) : 27cm x 19cm x 13cm
  • Weight Stuffed : 3.5Kg / 7.7 lbs
  • Weight Thing : 2.6Kg  / 5.7 lbs
  • Power Output RMS @ ‹1% distortion : 150 watts*
  • Battery life in Normal* use : 3~6 hours
  • Recharge Cycles : 500~800* (after which battery capacity will be at approx 75%)
  • Full recharge time (approx) : 4 hours
  • Fuse : 10A slow blow


*There is no ‘saturated square wave’ maximum power output value specified, as the internal anti-clipping circuit prevents this theoretical and nonsensical measurement at heavy distortion.

*Normal use is deemed as being used to amplify constant Rock / Pop music played at high volume without any sound clipping / distortion from excessive volume, and with a fully charged battery. This time will vary considerably depending upon the volume and type of use.

*Battery energy capacity slowly reduces over time according to many factors. After 500~800 charge / discharge cycles, the expected  battery capacity will be 75% of original capacity. New batteries can be easily installed if and when necessary.



There are two inputs as standard (designed to be connected to the headphone socket of an iPod / mini-disc / MP3 etc, or via a line-out socket, or connected to a radio microphone set). A third input can be added when ordered, or if you need a small battery powered mixer for more inputs, places like Maplin Electronics normally stock some cheap ones www.maplin.co.uk but but they can generally be bettered in terms of quality. For a higher quality, more expensive, and slightly larger battery powered or mains powered mixer try Behringer mixers - www.behringer.com

Since the amplifier chip is a high frequency switching mode one, it emits some radio interference which can interfere with AM, FM, LW, SW radio signals in close proximity – for this reason you may not be able to amplify these signals, but radio microphones are not affected and can be used with excellent results.

The main active speaker unit ‘Stuffed’ can be bought on its own and can be used either with or without the additional passive speaker ‘Thing’ attached. The Thing unit is just a speaker – it does not contain an amplifier or battery.

And remember…. you are paying for what is there, as well as for what isn’t !

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