Source:

Panasonic LDP Preamp ; none Power amp : 6BQ5 SE for horn, Inkel 200watt SS for Bass Bass. Currently using massive Hartley woofer from the 'Hartley Reference' box using the passive line filter.

His comment; "I think the low frequency is the foundation of the total sound. The Oris stands out nice without being troubled by the powerful sound of Hartley."