TDA2822M project

i have a genius vibration headphone .but the vibration is mono . so i wanted to mod it and make it stereo . when i opened it up i saw TDA2822M ic driving those vibrators and they are connected in series on ic's output .i knew 2822M is a stereo type amp ic .so i connected those vibrators in parallel (ground to left  vibrator & ground to right vibrator ) but the result is same .i checked the inputs but they are not connected as one (stereo) . help me pls..

Picture of TDA2822M project
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