21
Care and Polishing
The cabinets are best maintained by using a light automo1ve spray-on wax and a microfiber cloth. We use a
spray-on made by a company called Griot’s Garage™. While this may not be available in all markets, you can
use a similar product. Take care not to spray the aluminum badges. Do not place objects, such as drinks, on
top of your REL. Never use a dry cloth on this finish.
Gibraltar employs an advanced filter circuit which provides excep1onal performance when coupled to the
rest of the signal chain of the Sub-Bass System. A second-order variable low-pass filter approxima1ng a
Bessel func1on was chosen for its linear phase response, which equates to flat group delay. This means
that, unlike other filter func1ons, the amount of delay the signal is subjected to during processing is constant
through the en1re pass-band, which improves the frequency response and allows for be2er integra1on of
the sub with the main speakers. An addi1onal fixed second-order Bessel filter follows the variable filter,
removing unwanted midrange signals that, if le" unfiltered, cause the midrange of the main speakers to
become muddy or congested. All filtering is performed in the analog domain using high-quality components
with 1ght tolerances to ensure the highest possible performance and consistency.
The amplifier is fully DC coupled to avoid phase shi"s and compromises in its low end performance. It is
inherently stable and will retain its characteris1cs over very long periods of 1me – important in a unit
designed for an excep1onally long working life. These amplifiers are designed to withstand reasonable
abuse and overloads. If in doubt, please contact your dealer.
We believe that the importance of the electronics, cabinet and drivers being designed to work in harmony
is paramount. This belief allows Gibraltar to achieve the highest possible level of fidelity.
Overload Protec,on
All REL Sub-Bass Systems are designed as true sub bass speakers. They are designed to reproduce those
excep1onally deep notes that are felt rather than heard. This it will a2empt to do at whatever volume level
you set. If set too high no damage should result because the built-in electronics will limit the cone movement.
This electronic control is called Set-Safe™. It constantly and instantaneously monitors the output from the
power amplifier and is totally transparent in opera1on un1l required. This means it has absolutely no effect
on the sound quality of your REL un1l an overload is detected.
Technical
