The M&K Sound V12 at AUD $1,099 sits right at market equilibrium against your comparable dataset (median AUD $1,091, interquartile range AUD $1,091–AUD $1,091), making this a fair asking price with no obvious premium or discount. M&K's V12 is a solid mid-sized sealed subwoofer that typically commands AUD $800–AUD $1,200 on the used market depending on age and condition, so this lands squarely in expected territory for a unit in decent shape.
Before committing, verify the amplifier hasn't been abused—check for any hum or distortion at moderate volumes, and confirm the driver cone shows no tears, dust-cap damage, or visible wear. Confirm all original cables and documentation are included, and ask the seller directly about how intensively it was used and whether it's ever been serviced. The V12's sealed design is forgiving, but if it's been driven hard for years without breaks, internal components can fatigue.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.