User manual GENELEC HTS6

[. . . ] Audio input to the subwoofer can be made via balanced XLR or unbalanced RCA connector. We recommend the use of balanced cables and connectors due to their better noise immunity. The "LINK OUT" connector can be used for daisy-chaining several subwoofers together when high SPL is required. Simply connect a balanced XLR cable from the "LINK OUT" connector to the "XLR INPUT" connector of the next subwoofer. [. . . ] Although the HTS6 subwoofer is magnetically shielded, they may cause some picture distortion if placed near very sensitive video monitors or computer displays. front of the grilles. The reflex port and connector panel should always have a clearance of at least 20 centimeters (8") to any objects to ensure proper function of the port and cooling for the electronics attached to the connector panel. subwoofer. An input voltage of -6 dBu with a -6 dBu input sensitivity setting will produce 100 dB SPL @ 1m in free field. To obtain a 110 dB SPL output an input voltage of +10 dBu is required when the input sensitivity is set to 0 dBu. Flush mounting the subwoofer If the subwoofer is flush mounted into a wall or a cabinet, it is important to ensure unrestricted airflow from the reflex port and cooling for the electronic components. This can be done by making the recess 20 centimeters (8") wider than the subwoofer. Place the subwoofer into the right end of the recess with the drivers' side facing the room. This leaves sufficient 20 centimeters (8") of free space on the connector panel and reflex port side. The height and depth of the recess should not be any bigger than those needed to fit the subwoofer flush with the wall surface. Setting the Bass Roll-Off switches The acoustic response of the subwoofer may have to be matched to the characteristics of the room and the positioning in which it will be used. To adjust the subwoofer to match these characteristics use the ''Bass Roll-Off' control switches located on the connector panel. Table 1 provides some suggestions for the "Bass Roll-Off" switch settings. When all roll-off switches are set to "OFF", a flat anechoic response is obtained. Minimum clearances to walls or other objects The power amplifiers are attached to the lower part of the aluminium grilles, which function as a heatsink. Do not cover the grilles or place the subwoofer so that there is less than 10 centimeters (4") of free space in Setting the phase control Incorrect phase alignment between main monitors and subwoofer causes a drop in the frequency response of the whole system at the crossover frequency. The phase difference between the main Setting the input sensitivity The subwoofer requires input sensitivity alignment to the source to obtain a correctly balanced system. The input sensitivity control is located on the connector panel of the Phase Difference: 0° Phase Difference: 90° 120 Hz 120 Hz Phase Difference: 180° Phase Difference: 270° Remote control type 12 V DC remote control Pole or contact + Contact 1 Contact 2 Connect to remote control input pin no. The effect of phase difference between the subwoofer and the main speakers Connect only one remote control unit at a time Table 2. Remote control connector pin sequence speakers and subwoofer at the listening position is dependent upon the position of the subwoofer, so the phase adjustment should be done only after the preferred position is found. Acoustic measuring equipment is required for accurate system alignment. If this equipment is not available, the following coarse phase matching can be applied. Toggle the -180° phase switch `ON' and `OFF' and set it to the position which gives the lowest sound level at the listening position. Next toggle the -90° phase switch `ON' and `OFF', and again set it to the position which gives the lowest sound level. Finally, set the -180° phase switch to the opposite setting. bass level increases by 6 dB. Three subwoofers give an bass SPL increase of 9, 5 dB and four subwoofers 12 dB compared to a single subwoofer. Adjust the sensitivity control of all subwoofers in the group to match the SPL level with the main speakersystem. [. . . ] The curves above show the harmonic distortion analysis of the HTS6 in free field. In half space the SPL will be 6 dB higher. VIBRATION ISOLATORS f ~ 2-8 Hz VIBRATION ISOLATORS f ~ 2-8 Hz Figure 7. Correct flush mounting in a semiabsorbing wall. ABSORBING MATERIAL Automatic protection circuits The HTS6 is equipped with protection circuits against speaker driver thermal overload and amplifier overheating. The protection system resets automatically so the user only has to turn the input level down to ensure that it does not reactivate. · Always use a mains power connection with protective earth. [. . . ]