The term GHP denotes "Geschlossene Bauweise mit Hochpass" in German, which
means "sealed cabinet with high pass". Here you can find some theory
about high pass.
Excerpt from the review in Hobby HiFi:
"For the listening test we also included the 18 inch subwoofer Sub Zero, featured
in Hobby HiFi 5/2007." ... "The first listening session still took place without
bass support. Here, the compact monitor proved to be quite convincing on its
own. Every type of music sounds unbelievably natural and almost detached from
the loudspeakers. Width and depth are a spot on, even the finest details are
depicted meticulously. But the most amazing is the bass: bone dry and with
breathtaking pace. Obviously, the lowest bass is missing. A large church organ
or a double bass won't sound as powerful as coming from low bass capable loudspeakers.
But the dynamics are extraordinary. One would believe that only large floorstanding
loudspeakers are capable of delivering such power. Considering that this is
a five litre loudspeaker, there is only one word describing what happens below
100 hertz: astonishing. And when the perfectly adjusted to Sub Zero was added,
it became obvious again, how valuable a bass module is for any type of music.
The church organ and the double-bass sounded now as they should, a rare experience.
The sound became altogether larger and wider. The spatial arrangement of vocals
and instruments remained intact, but with a lot more depth. ...
Price per speaker without cabinet EUR 703,80 excl. VAT: € 606.72 / $ 709.87
Price per speaker without cabinet EUR 932,87 excl. VAT: € 804.20 / $ 940.91
Price per speaker: EUR 12,67 excl. VAT: € 10.92 / $ 12.78
Hobby HiFi Overview