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two large speakers in a black void

MKII | 3-Way Powered Speaker


The MKII is a powered 3-way speaker system designed with simplicity, presence and glorious sound as the focus. The system needed to be self-contained and portable so that anyone could set it up and use it - even if they have no experience with pro audio.

multiple views of speaker: side, front and rear
a rendered side view of speaker showing the internal circuitry and drivers

Inside each cabinet is an active crossover, splitting the input into the high, mid and low frequency bands that are allocated to the tweeter, mid and low frequency drivers respectively. Each of these are driven by a dedicated Class D power amp, totaling 800W of available power in each cabinet.

The system is powered by a Meanwell SE-1000 located inside the cabinet. It accepts AC mains voltage and conditions it to 24VDC. These had been modified with a fan controller board so that the cooling system only activates the fan when the temperature of the heatsink increases to 55℃ or above. This was required as, during low power states, the internal fan is louder than the output audio.

angled photo of right speakerangled photo of left speaker

Dayton Audio DC-250 10” Classic Woofer
Dayton Audio PK165-8 6” Kevlar Midrange
Dayton Audio ND28F-6 1.125” Neodymium Tweeter

3.5mm Stereo Input (TRS)
¼” Line Level Link (TS)
Volume Control
Baxandall Treble Control
Baxandall Bass Control
IEC Power Input
Internally Regulated to 24VDC

Sure Electronics TAS5630 Class D 2x300W (@ 3Ω)
Wondom T-Amp Class D 1x200W (@3Ω)
Sieger 3 Way Active Crossover and Preamp

Baffle Material - 15mm MDF
Other Material - 18mm Premium Birch Ply
Penn Elcom Hardware
Sieger Anodized Aluminium Control Plates
Sieger Illuminated Logo Power Indicator

small cat sitting on large speaker
two speakers being built outdoors
messy workbench covered in electronics and tools
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In loving memory of Gold Street

Sieger logo in a modern blackletter style