Download 6Moons test report. July 2013 (PDF). - German Physiks

Packed in heavy-grade double-boxed cardboard lined with form-fitting foam huggers and additionally protected in a
cloth sack with flexible foam rings around top and bottom MDF caps, carbon DDD shielded from dust behind cling wrap,
reversible spikes with point and ball ends in a separate folder with a test CD and owner's manual, the HRS-120 proved to
be easy to carry and set up. Because I'd requested shipping without German Physiks' de rigueur pallet—I don't own a
pallet strapper and storage is limited—a likely drop of one box had loosened the top assembly of one speaker. It fell off
whilst I walked the speaker up my stairs. Apparently a first for the company, perfectionist Teutonic pride had taken a hit
but the only physical damage was to the painted MDF cap. This screws directly into the DDD's top-facing magnet with
one fat central bolt. The very same day the Frankfurt-based factory dispatched a replacement cap and some Ponal wood
glue to have me reseal the head/enclosure seam and prevent possible leakage of the DDD's backwave which loads into
its own sealed section of the octagonal pipe. Problem solved. The firm probably won't ship without a pallet ever again.
1: a conventional spider suspends the funnel's apex | 2: an inverted rubber surround terminates it on the bottom | 3: facing
the listening space | 4: the DDD assembly topped by the magnet with MDF cap removed.
As the photos show, the DDD is a bit like a megaphone. It stands on its bigger open end with the magnet blowing in. But
sound doesn't travel alongside its expanding inner wall as it would in a real megaphone. Instead the wall itself vibrates to
generate sound inside and out. What's usually the rear wave firing straight back into its enclosure here first is an inner
wave. For the vast majority of the driver this inner wave reflects off its own membrane multiple times before it migrates
into the heavily stuffed upper portion of the octagonal enclosure proper. This reflective action of the inner wave is bound
to interact with the outer wave unless the oscillating funnel sat atop an absorptive inner pointy hat like a Zu Griewe
cartridge.