The couch is in a very poor location. It is in the center of the room. It will achieve the maximum frequency bump at the 1W and 1L frequency. It's also in a node at the 2L frequency, which might actually help compensate for the huge bump we expect to see at this frequency. However, more likely, this position will yield phase distortions. In general, avoiding locations that are not in the peaks or nulls of the first few modes is desirable.