Operating Instructions for the Serie R Sub-Bass System REL Acoustics Limited North Road, Bridgend industrial Estate Bridgend, CF31 3TP United Kingdom Telephone: +44 (0)1 656 768 777 Fax: +44 (0) 1 656 766 093 Web: www.REL.
Important Safeguards 1 Read all of these instructions. 2 Save these instructions for future use. 3 Unplug from the wall socket before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. 4 Do not use near water. 5 Do not place on a stand or table; it may fall causing injury to a child or adult, and damage to the unit. 6 The unit should only be operated from the power source indicated on the panel of the amplifier. 7 Only use the power cord supplied.
About the Serie R Sub-Bass Systems Many or most loudspeakers emphasize the mid-bass. This is the range from 50 – 90Hz. We at REL believe this is an incomplete approach and that loudspeakers need to be supplemented in the lower frequencies for true full range reproduction. All of our designs are true Sub-Bass Systems, meaning they are designed to reproduce very low frequencies (below 30 Hz) that are felt rather than heard.
R-528 represents the final step-up in the Serie R platform and, as is REL tradition, imbues the largest model in the range with superlative depth and scale. Numbers do not tell the full story here, as the weight and power of R-528 at full song is prodigious indeed. R-528 receives a Heavy 12™ active bass-engine coupled to a VariCone 12” carbon fibre ABR passive radiator producing the equivalent of a 16” driver in a larger cabinet than its smaller brother.
Connecting Up Always switch off your system before connecting or disconnecting any wires. To increase the versatility of connecting up, each Serie R model is equipped with two separate inputs. A Neutrik Speakon socket and a single phono socket. This is to facilitate use with both two channel stereo systems and AV surround sound systems.
Using the Low-Level Inputs .1 Input: This requires a phono-to-phono cable and is a dedicated true .1 channel. This circuit therefore eliminates the normal Natural RollOff Crossover and passes the .1 low-level signal through with only the required 120Hz 4th order crossover. Low-Level Input: This single channel phono input allows for conventional connection to a preamplifier and should be used in the rare event that a high-level connection proves incompatible. Connect as shown below.
2 When possible, the REL should be placed in one of the corners behind the speakers. Remember, we are dealing with true LOW bass pressurization with RELs. Low bass pressurization below 40Hz is best derived from corner placement, where the most linear and efficient low bass can be produced. Connecting and Setting Up High-level connection, using the enclosed cable with the Neutrik Speakon connector, is always the first choice.
4 Placement: The next step is to determine precisely how far out from the corner the sub should be placed to achieve the most efficient output, as well as the lowest frequency extension. With the REL fully into the corner, and pointing straight out along the diagonal coming out of the corner, continuing to play the music, slowly pull the REL from the corner on the diagonal, equidistant from both side and rear wall.
Technical The Serie R models use an unusual method of bass loading. It is designed to operate below normal system resonance. This has been achieved without the normal form of bass boost or electronic equalization.
R-528 Specifications Type: Active Drive Unit: Passive Radiator: Lower Frequency Response in Room: Input Connectors: Gain Control Range: Power Output: Phase Switch: Amplifier Type: Protection System Fully Electronic with SET-SAFE: D.C. Fault: Output Short: Mains Input Voltage: Fuses: Passive Radiator, front-firing active woofer, down-firing passive radiator 12 in., 300mm long-throw, steel chassis 12 in.
R-328 Specifications Type: Active Drive Unit: Passive Radiator: Lower Frequency Response in Room: Input Connectors: Gain Control Range: Power Output: Phase Switch: Amplifier Type: Protection System Fully Electronic with SET-SAFE: D.C. Fault: Output Short: Mains Input Voltage: Fuses: Passive Radiator, front-firing active woofer, down-firing passive radiator 10 in., 250mm long-throw, steel chassis 12 in.
R-218 Specifications Type: Active Drive Unit: Lower Frequency Response in Room: Input Connectors: Gain Control Range: Power Output: Phase Switch: Amplifier Type: Protection System Fully Electronic with SET-SAFE: D.C. Fault: Output Short: Mains Input Voltage: Fuses: Down-firing active woofer 10 in.
