Troubleshooting: Heston Sub 200 sound dull/weird/bad

Short answer

Check the volume of the subwoofer. Open the Marshall app and toggle the phase inversion on/off for the subwoofer to find the best sound. Check the cutoff frequency for Heston Sub 200 in the Marshall app.

Check the volume of the subwoofer.
Open the Marshall app and toggle the phase inversion on/off for the subwoofer to find the best sound.
Check the cutoff frequency for Heston Sub 200 in the Marshall app.
If your speaker is connected to soundbar using RCA lead, check the soundbars cutoff frequency.
Try inverting the phase for Heston Sub 200 in the Marshall app.

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