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If it's an Insignia TV I think the TV remote should also control the soundbar volume but still try to increase the volume using the soundbar's remote and also try increasing the volume with the volume button directly on the soundbar. If you've tried all those things and the volume is still low, then I would try using an optical cable and see if that helps.
Sorry, there was a problem. Please try again later.Is it connected via the headphone jack if not try that I set the volume on the tv to a mid range then turned the volume up on the sound bar with the included remote until it was loud
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