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-12-08
Designed for a dual driver sealed box with 3 cu ft volume (2 drivers to one amp)
GR SW-12-16FR
Designed for a open baffle and infinite baffle applications
Single and double driver options
The first two GR drivers are designed for a sealed box with 1.5 cu ft of volume per driver. GR SW-12-08 is designed to run two drivers on the one amp. Each driver has a nominal 8 ohm impedance, and are intended to be connected by a parallel connection, resulting in a 4 ohm load to the amplifier. The dual driver option will have additional output as well as lower distortion for a given output level. A 3 dB gain in efficiency is gained, thereby yielding a 3 dB increase in continuous maximum output. For short burst transients, 6 dB increase can be achieved.
Open baffle and infinite baffle options
To achieve higher output in an infinite baffle or dipole configuration, SW-12-16FR has been designed so that 2 or 3 drivers can be connected to a single amplifier. The higher 16 ohm impedance allows a parallel connection. With 2 or 3 drivers, high output can be achieved even with an open baffle.
Conventionally, drivers with a high Qts are used in these applications to achieve the desired frequency response. With Direct Servo, a much higher degree of control of the cone is maintained than with a conventional non servo driver.
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 performance suffers more 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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