Decware Project-X FRX Owner's Manual
O W N E R S M A N U A L
MANUAL NO. 02 REV. DATE: 7/2011
The Full Range
Project-X Loudspeaker
Decware / High Fidelity Engineering Co. East Peoria IL USA www.decware.com
MODEL-FRX
O W N E R S M A N U A L
INTRODUCTION:
The FRX drivers are designed for open baffle applications employing low power amplifiers. The
driver is 8 inches and has a full range response.
They are hand made and therefore very limited production drivers with superb frequency
balance that has been made possible by electromotive coupling. Electromotive coupling is a
magnetic circuit that has been tuned to offer spectacular performance within a narrow power
window. Put another way, these speakers are not meant to reach party listening levels, instead
they were designed for intimate listening at sane volumes. Exceeding this volume restriction
will result in completely harmless, but nonetheless objectionable, distortion. You’ll quickly
know when you are over driving them because they’ll tell you. The distortion is in the magnetic
circuit itself, not the physical speaker. We designed the magnetic circuit to handle about 7
watts, whereas the physical speaker can handle 30 watts. Naturally if you use an OTL or Solid
State amplifier that faults and puts DC voltage on the speaker, it will fry the FRX without
hesitation just at it would any speaker.
INSTALLATION
The FRX driver can be installed at any angle without effecting performance. The binding posts
on the rear of the driver accept up to 8 AWG wire, SPADES or BANANA jacks. In open baffle
applications is it recommended to hook your speaker cables directly to these binding posts.
AMPLIFICATION
The ideal amplifier for these drivers is a 6 watt per channel TRIODE amp with no negative
feedback. The perfect amplifier is our Zen Torii push pull amplifier because it adds substantial
weight to the lower frequencies, and has an adjustable treble control so you can flatten out the
highs in any room.
ENCLOSURE
The perfect enclosure for these drivers is the DECWARE Zen Open Baffle (ZOB) of which plans
are available on the web site, www.decware.com. A picture of the ZOB enclosure design is
shown in the back of this manual.
Decware / High Fidelity Engineering Co. East Peoria IL USA www.decware.com
O W N E R S M A N U A L
PRINCIPLE OF OPERATION
The varying current entering the FRX motor
from your amplifier creates a varying magnetic
flux in an air gaped grain-oriented silicon steel
laminated core via a primary coil winding and
thus a magnetic field through a secondary
winding is developed.! This varying magnetic
field induces a varying electromotive force
(EMF) in the secondary winding called mutual
induction. Once this secondary winding is
properly tuned with a resistive load, AC
current is allowed to flow through this airgaped circuit via the primary and out to the
voice coil.! Since the EMF at a given flux
density increases with frequency, the
secondary (tuning coil) absorbs the artificial
rise in response and ringing caused by the
high strength motor assemblies used in this
type of low mass driver.! Despite
appearances, when the tuning load is
removed no current can flow to the voice coil.!
This exotic approach to magnetically coupling
current from the amplifier to the voice coil is
what gives the FRX it's uniquely smooth and
highly present sound.
This approach works by designing a driver
that is over the top in high frequency
projection and then offsetting it with
electromotive force.! The result is smooth
linear response without loosing the hyper
speed and insane detail that comes from the
overly strong neo magnet.
The FRX design also brings significant if not
profound improvements to the overall phase
angle and sense of timing and pace when
compared to normal drivers. I believe it is part
of what brings absolutely lucid imaging to the
table when a pair of these are used with good
tube amplification
Decware / High Fidelity Engineering Co. East Peoria IL USA www.decware.com
O W N E R S M A N U A L
FRX in Zen Open Baffle - FREQUENCY RESPONSE
FULL FREQUENCY RESPONSE Shown in Blue.
(15,30 degrees) OFF AXIS taken from 200Hz to 20KHZ.
Mic distance 12 inches.
FRX in Zen Open Baffle - IMPULSE RESPONSE
with TORII MKIII amplifier using voice coil feedback and treble control adjusted for flattest response.
Decware / High Fidelity Engineering Co. East Peoria IL USA www.decware.com
Measured in
ZEN OPEN BAFFLE ENCLOSURE
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