While these three drivers are identical in appearance, details of the motor are different to cater to different applications.
GR
SW-12-04
Designed for a sealed box with 1.5 cu ft volume
GR SW-12-08FR
(OB)
Designed for a open baffle and infinite baffle
applications. 8ohm nominal impedance. Recommended for running a
pair with HX300-12OB configuration
GR SW-12-16FR
(reference only)
Designed for a open baffle and infinite baffle
applications. 16ohm nominal impedance.
Single and double driver options
SW-12-04 is designed for a sealed box with
1.5 cu ft of volume per driver.
Open baffle and infinite baffle options
GR SW-12-08FR and SW12-16FR are designed to
run two drivers on one amp with OB configuration. With 2 or 3 drivers,
high output can be achieved even with an open baffle. To achieve
higher output in an infinite baffle or dipole configuration, SW-12-16FR
has been designed so that up to 3 drivers can be connected to a
single amplifier with high efficiency Hypex module whereas SW12-08FR
has been designed only 2 drivers can be connected to a single amplifier.
SW12-08FR gives slightly more output per driver than that of SW12-16FR.
Conventionally, nonservo drivers with low Qts
value suffer low output at around Fs frequencies (ie, stall effect).
Drivers such as SW-12-08FR/SW-12-16FR with high Qts values on the
other hand achieve the desired flat max output response curve. However
high Qts in nonservo application means the cone control is also
weaker. Servo control on these OB drivers allows the effective Qts
value drop to 0.15, achieving a much higher degree of cone control
even than that of a conventional nonservo driver. As a result, these
drivers achieve both high output and high cone control at the same
time.
Driver comparison
The GR drivers use a lower mass paper cone,
which has a slightly better transient response. The result is slightly
better dynamics. At higher output, due to less cone stiffness, the
sound may become softer due to the pressure placed on the cone.
The GR drivers also have a more extended response, allowing a higher crossover point if desired.
The performance can be described as "different" rather than superior or inferior.
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