the model DFR8.
The rather fascinating cabinet design
redefines what is possible with a single driver in nearly every
category and represents a 6 year investment of designer Steve Deckert's
The cabinet is comprised of 3 triangular chambers that are ported at the bottom and coupled at the top, each at a different frequency, feeding an averaging chamber in the base. The chamber is further tuned with it's own port and the whole thing feeds a straight transmission line running straight up the back of the cabinet. This line terminates into a plinth setting on top of the speaker cabinet changing the energy from horizontal to vertical to create a near omni effect for the rich ambiance that emanates from this line.
The back wave from the driver is not reflected back like virtually all other cabinets, but instead absorbed by two tangentially placed passive radiators designed to resonate across 3 decades to absorb the energy and release it into the room.
The result is a cabinet that has 5 resonances spanning two octaves. Since each tuning damps the driver at it's center frequency, the HDT has double the linearity of a ported box, as excursion is controlled across 2 octaves rather than 1.
So with all this linearity, and speed with no back wave congestion to create single driver "shout", you have a reference grade frequency response that extends across the entire usable audio range.
Performance is disarming, as the dynamics and ultra low distortion even at loud volumes replicates real better than any hi-fi speaker with a crossover.
94dB with one watt power, and some of the most coherent and textured bass you will ever hear come from a box speaker.
HDT's are at home with 2 watts but can also handle over 100
class A tube watts making them at home on either side of the fence...
Small SET amps to large KT88 push pull monsters can be used without
distortion. This ability to work well in either camp is one of
the biggest things that separates these from other single driver
designs that are too delicate to handle real power.
Extremely honest, the HDT's are used at Decware for final voicing of
the all amplifiers because as Steve puts it; "They tell me what's wrong
faster than any other speaker we have". A great tool for
amplifier design. When the signal feeding these speakers is bad,
the sound is bad. When it's good everything sounds real and you
can no longer hear the speakers or amplifiers.
The result of this design is linear response from 38Hz to 20000Hz
without inductors or networks to dumb down dynamics as illustrated by
the impulse response above - where the speaker (light blue) measured
impulse hides behind and accurately follows the test signal in
Minimum 2 watts
Maximum 100 watts
ON THE SOUND
that is often hard
find in most high efficiency speakers... They accurately reflect
the recording source and amplifier. Imaging is one of these
speakers strong points and they virtually disappear with good upstream
components. Musicians will appreciate the accuracy of timbre and
harmonics making it effortless to identify specific brands and models
of instruments in the recording.
38Hz ~ 20kHz
8 ohm nominal impedance
Driver compliment - DECWARE DFR8
Crossover - none
2 ~ 100 watts
Max SPL 116dB
Size 13.5" wide, 13.5" deep, 39" high
HDT - 2003 to Present
This speaker design has remained unchanged since it's release in 2003
with the exception of a driver upgrade. The DFR8 full range
driver used in this cabinet was improved in 2005. The cone is now
white instead of black.
have a support forum
many people who own our speakers who's experiences you may benefit
manual in pdf format.