4Table of contentsSafety Instructions ................................................ 2-31. Introduction .......................................................... 52. Quick Start............................................................ 62.1 Important Information........................................... 62.2 Connecting the speakers ...................................... 63. Recommendations on Setup ................................. 73.1 Room acoustics..................................................... 73.2 General recommendations .................................... 74. Speaker Positioning .............................................. 8-94.1 The stereo triangle ................................................ 84.2 Surround placement ............................................. 84.3 Horizontal setup of the GTC 77 + GTC 88 ............. 84.3 Horizontal setup GTC 77 + GTC 88 (continued)..... 94.4 Horizontal setup of the GTC 55 ............................. 95. Connecting the Subwoofer .................................... 105.1 Connections .......................................................... 105.2 Input ..................................................................... 105.3 Satellite Out .......................................................... 105.4 Sub Out ................................................................. 106. Subwoofer Placement ........................................... 116.1 Distance to satellites............................................. 116.2 Walls/Distance to walls ........................................ 116.3 Finding the optimum position ............................... 117. GTC Sub Controls .................................................. 12-137.1 Mode ..................................................................... 127.2 Subwoofer Phase .................................................. 127.3 Satellite Filter ........................................................ 137.4 Sub Level .............................................................. 137.5 Sub Filter............................................................... 138. In-wall Installation ................................................. 149. Troubleshooting .................................................... 159.1 Distorted or no signal............................................ 159.2 GTC Sub: No or distorted signal ............................ 159.3 GTC Sub: Parasitic noises ..................................... 1510. Maintenance ......................................................... 1611. Shipping / Packaging............................................ 1612. Environmental Information.................................... 1613. EU Declaration of Conformity................................ 1714. Limited Warranty................................................... 1814.1 Terms and Conditions ........................................... 1814.2 How to claim ......................................................... 1815. Technical Data....................................................... 19