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#204678 - 04/18/08 04:57 PM Active Auto On/Off on EP175
kazkru Offline
frequent flier

Registered: 12/27/07
Posts: 12
I recently purchased an EP175. For whatever reason I can't get the Active Auto On/Off feature to automatically shut the amp off after a period of time with no signal from the amp. I'm using the high level imputs, and wonder if the auto on/off feature will not work when using these. Even with the amp off for several hours, there is still a quiet humm from the amp and it is not shutting off.

Any help understanding what is wrong would be appreciated.

Thanks,

Kaz

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#204679 - 04/18/08 05:01 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17699
Loc: NoVA
I believe it will not work with the high level inputs, but I am not certain. Worth giving Axiom a call.
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#204682 - 04/18/08 05:10 PM Re: Active Auto On/Off on EP175 [Re: Ken.C]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
Are you using high level inputs because your receiver does not allow for using a coax sub cable?
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#204683 - 04/18/08 05:12 PM Re: Active Auto On/Off on EP175 [Re: SirQuack]
kazkru Offline
frequent flier

Registered: 12/27/07
Posts: 12
 Originally Posted By: sirquack
Are you using high level inputs because your receiver does not allow for using a coax sub cable?


Yes

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#204720 - 04/18/08 10:23 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10309
Kaz, the use of the high level inputs should make no difference in this matter, since if there's no input there's no input, and the amp should shut off after the designed time regardless of what connection is used. You might contact Axiom directly on the possibility that the shut-off circuit on your particular EP175 isn't adjusted correctly.
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#204873 - 04/20/08 03:49 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3178
Loc: Toronto/New York/Dwight
Hello Kaz,

Your remark that there is a "quiet hum" present when the EP175 has not shut off suggests to me that you have a ground loop hum. The EP175 would perceive this as a signal input even if your main AV receiver or amplifier is shut off. Ground loop hum can exist even if all the other components in your system are turned off. Check the cable-TV input. It's usually the source. Disconnect it where it enters your cable/converter box. If the quiet hum disappears, then you'll need an isolating transformer available from Axiom or (rarely) from your TV cable provider.

Try our trouble-shooting steps to getting rid of the ground loop hum (in the Articles Archive) and it should solve the problem of the sub not turning off.

As JohnK pointed out, the auto circuit operation is not dependent on using the low-level or high-level inputs.

Regards,

Alan
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#204876 - 04/20/08 04:05 PM Re: Active Auto On/Off on EP175 [Re: alan]
EFalardeau Offline
connoisseur

Registered: 08/27/07
Posts: 3269
Loc: Laval, Quebec, Canada
Good one Alan! I can't believe none of us picked up on that "quiet hum"! This makes a lot more sense. \:\)
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#204987 - 04/21/08 03:37 PM Re: Active Auto On/Off on EP175 [Re: alan]
kazkru Offline
frequent flier

Registered: 12/27/07
Posts: 12
 Originally Posted By: alan
Hello Kaz,

Your remark that there is a "quiet hum" present when the EP175 has not shut off suggests to me that you have a ground loop hum. The EP175 would perceive this as a signal input even if your main AV receiver or amplifier is shut off. Ground loop hum can exist even if all the other components in your system are turned off. Check the cable-TV input. It's usually the source. Disconnect it where it enters your cable/converter box. If the quiet hum disappears, then you'll need an isolating transformer available from Axiom or (rarely) from your TV cable provider.

Try our trouble-shooting steps to getting rid of the ground loop hum (in the Articles Archive) and it should solve the problem of the sub not turning off.

As JohnK pointed out, the auto circuit operation is not dependent on using the low-level or high-level inputs.

Regards,

Alan


Thanks for the reply, Alan. Your suggestion makes a lot of sense, however there is one problem.....it's used for stereo only, so no TV coax cable is hooked into the amp.

The only thing I can think of is that the amp is a tube amp which I'm wondering might have something to do with it. However, I would guess that whether it's a tube amp or solid state/transistor amp, when they're off, they're off, and there would be no signal either way. Might it be possible the tube amp, even when turned off, is somehow still leaking a tiny bit of juice through the speaker outputs?

I'm at work now, but when I get home tonight I will try experiment a little by unplugging the amp completely. I'll also go check out the troubleshooting article you recommended as well.

Thanks again.

Kaz


ps. thanks to all the others for their responses also.


Edited by kazkru (04/21/08 03:38 PM)

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#205018 - 04/21/08 05:29 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
Kaz,

It doesn't matter if your cable isn't hooked up to your amp. Take it from me. I was in the same spot as you. I coerced the cable company to come and install an isolator at the entrance and that took care of all my problems. It has to do with the way the cable company grounds the incoming cable.

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#205043 - 04/21/08 10:37 PM Re: Active Auto On/Off on EP175 [Re: kazkru]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10309
Kaz, as you described the situation, it would appear to be less likely to involve a ground loop. You say that the quiet hum is coming from the sub amp(not the driver cone). This would be more likely to indicate a mechanical hum from the sub amp transformer windings(nothing very unusual or to be concerned about as such)rather than an electrical hum caused by a ground loop, coming from the driver cone. If there was a strong enough ground loop current to keep the sub amp "awake", it'd be likely that you wouldn't be asking about a slight hum from the amp which was supposed to be off, but rather a loud hum coming from the cone when the sub was on and playing.
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