User manual MERIDIAN AUDIO M2K5

[. . . ] Inside the packaging you should have found: · · · · · 1 M2500 Active Subwoofer complete with grilles and castors 4 screw in spikes 4 lock nuts and a nut spanner 4 plastic spike covers this manual M2500 User Guide 3 · · 1 power cord suitable for your territory 1 long phono-phono analogue audio lead If any of these items is missing, please contact your dealer. We suggest that you retain the packaging carefully, as it provides maximum protection in transit. Getting Going IMPORTANT Before connecting to the AC supply, check that the : unit has been manufactured to the correct supply voltage for your territory. IMPORTANT Do not make any alterations to the connections of : your system with the M2500 AC power switched on. We suggest you follow the full instructions in the Installing your M2500 section. [. . . ] Unbalanced Audio Unbalanced audio may be connected to the phono sockets on the M2500 with the audio lead provided. LR- L+ R+ If your preamp or surround sound decoder has a mono subwoofer output, connect this to the L+ socket only. This is the connection you should make if you have a 565 Digital Surround Processor. If your preamp or surround sound decoder does not have a mono subwoofer output, you can connect to both the L+ and R+ sockets. The M2500 will combine these signals to produce the mono signals it needs. If you know that you require the subwoofer to invert absolute phase, you can connect to the negative L-, or L- and R-, sockets instead. If you are unsure, Use the positive L+, or L+ and R+ sockets to start with. Balanced Audio Balanced audio may be connected to the LEFT and RIGHT BALANCED INPUT XLR sockets. If your preamp or surround decoder has a balanced output, it may be connected as follows. Signal phase negative. If your preamp or surround decoder provides a mono subwoofer output, connect to the Left input only. If it does not, you can connect to both the Left and Right inputs and the M2500 will combine them. M2500 User Guide 6 Calibration Calibrating the subwoofer may be done in conjunction with the setup procedure of your surround sound decoder if you have one. Crossover Selection The M2500 has three crossover settings which can be selected with the two toggle switches on the rear panel. It is vital that these are set correctly. 125 Hz BYPASS 80Hz Pushing the right hand switch to BYPASS bypasses the crossover in the M2500. Use this if the subwoofer output of your preamp or surround sound decoder has an internal crossover. Pushing the right hand switch down engages the crossover, which is a second order low pass. The left hand switch then selects the crossover frequency to 125Hz or 80Hz. This choice depends on the high pass crossover frequency used for the main speakers. Sensitivity Setting The sensitivity of the subwoofer needs to be set to give the correct level of bass for the system. If you have a surround sound decoder such as the 565, it will have a procedure which allows you to calibrate this level. Turning it clockwise increases the sensitivity and turning anti-clockwise makes it less sensitive. To avoid loud surprises, always start with a low sensitivity setting and increase as necessary. If you do not have a surround decoder, you can calibrate by listening to well known source material and adjusting the sensitivity until the bass sounds solid and deep but not boomy or intrusive. Alternatively, it can be calibrated with the aid of a noise generator and a sound pressure level meter. [. . . ] Attempted servicing by unauthorised people may invalidate the guarantee. Labour and carriage charges are not covered unless by local agreement. If you request service under guarantee, proof of the date of purchase will be required. Outside the UK, local warranty liability is restricted to equipment purchased within the territory. [. . . ]