Alto TS Sub18 Pair - One Extremely High/Loud on power up, other blowing fuses

Hi folks

I am looking for a little help for these subs

I have a set of the above subs, which have both stopped working on two separate occasions over the past few months (subs previously had issues but were under warranty).

Sub 1. This sub produces a really loud screaming like pitch when powered up. There's no audio connected when this happens.

Sub 2. Last week, the sub tripped a venue power supply and blew the external and internal fuse. Since then, I've replaced both fuses with the supplied spares and they've blown again.

These subs have seen very little use overall and are well looked after when operational. It's a real pity they've not been very reliable because when they work, they're fantastic subs.

Please help!

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