Electric drone stalwarts Slomo return with only their fifth album in 20 years, “Zen and Zennor”; their sonic palette refreshed, their focus again tuned to the spectral otherness of Land’s End. The cover star – Zennor Quoit – is a colossal megalithic structure to be found on moorland above the village of Zennor, 4.5 miles to the west of St Ives.

Primitive melodies and arcane motifs are buffeted by drifting analogue oscillators on lead track ‘Zen and Zennor’, compressing into thick saturated drones before taking a sublime turn into familiar subterranean territory. ‘Zennor Diode’ crackles into manifestation above the moorland, cautioning against – or perhaps encouraging – experiments with exposed electrics in the Cornish mizzle. Complete removal of self (and band) is provided with circuit-closing track ‘Antechamber’, dissolving the Zennor’d-out participants into the hum of the Hummadruz*.

The duo continues to be informed by their work elsewhere; Chris (“Holy”) McGrail recently contributed to Julian Cope’s Dope and Queen Elizabeth projects, while Howard Marsden co-runs Hebden Bridge’s already-legendary Ambient Bowling Club, where experimental music mixes with environmental sounds, low chatter and the soft clank of bowls.

“Zen and Zennor” wraps Slomo’s only constant – immense, eventual catharsis – in a freshness and immediacy that could perhaps suggest a quickening of their notoriously glacial pace. Time will tell.

*Hummadruz refers to a mysterious, low-frequency hum or droning sound, often said to be heard around the ancient sites of Land’s End.