Sub not switching off...

[pmanson]

Hi All,

Recently did a few upgrades on the cinema (started with just the TV and then seemed to snowball).

Anyway the sub is not switching off/to standby when the amp switches off (it used to switch off automatically after a couple of minutes with the previous amp).

The new amp is an Onkyo 656 (old one was an Onkyo 626). The only real difference I have in settings is that I have the AMP set to ARC to allow TV apps to pass through sound to the amp.

Would this stop the sub going into standby? Or do I need to try a new sub cable?

Many thanks,
Phill

[KamSandhu44]

If the sub is not using a 12v trigger, then you can expect this.

The sub will turn on when it senses a signal. This could even be some sort of interference.

Mine randomly turns on and off, generally I just leave it.

You could try turning the gain up a little to see if it helps.

[telford_mike]

If the new amp supports HDMI passthrough (still passes the signal even when it's off) this may mean the sub never switches off.

[pmanson]

Interesting!

We seem to be getting a lot of 'hum' from it which I suspect is interference.

HDMI pass through is switched on (oh well i'll just make sure I remember to switch it off after a film from now on

Thanks both

[KamSandhu44]

HDMI passthrough should have no affect on this.

I have it switched on, yet my sub will turn off.

The hum is caused by interference which could be causing it to stay on.

Could be a simple fix.

Google 'Ground loop interference'

Common problem.