No input signal to amp from receiver?

[md_gt]

Newbie here, I originally posted this thread in the Audio Hideout section, but was referred to post here. Here's a link to that thread:

https://www.htguide.com/forum/showthread.php?t=20579

I recently purchased a Harman Kardon AVR240 as well as a Behringer EP1500 to power my subwoofer. I have connected them from the subwoofer pre-out on the receiver to the behringer input through a shielded male-to-male rca cable which connects to a 1/4" unbalanced mono jack adapter.

I've tried everything but I cannot get the EP1500 to receive a signal (the signal light doesn't even light up).

Any help/ideas would be appreciated.

[---k---]

I assume that "I tried everything" includes turnning the sub channel up?

More importantly, do you get sound out of the sub even though the light doesn't light up? Mine doesn't light up except when the levels are mild to high.

[BobEllis]

First make sure that you really have the sub amp cable plugged into the subwoofer output on the receiver. Been there, done that.

Is the gain on the Behringer turned up? (front panel)

Try a different RCA cable.

Then check that the receiver wants to send output to the sub - set your main speakers to small, be sure that your subwoofer setting is not "none" or something to that effect. Also ensure that the subwoofer level is not attenuated. Play some really bass heavy and see if it makes the sub amp light up.

failing that, Use your cable and plug your CD player into the Behringer - without a speaker connected. Does it recognize the signal?

Do you have a voltmeter? Send your receiver a signal around 30-40 Hz (try one of the many free software tone generators) plug your sub amp cable back into the receiver and and check that you are getting a signal between the sleeve and tip of the adapter.

[ThomasW]

There are some home audio devices that lack adequate the necessary drive voltage to run pro sound amps. If that's the case then you'll need to buy a line level shifting device.

Here a links to some

http://www.zzounds.com/item--EBTLLS2PKG

http://www.sweetwater.com/store/detail/CleanBox/

[chasw98]

Check the dip switches on the back of the EP1500 and make sure the lo cut filters are not engaged. Check all other settings while you're back there looking at it. Be careful when setting the switches. On & off on the switches do not correspond to on & off that the EP1500 uses. HTH.

[md_gt]

Then check that the receiver wants to send output to the sub - set your main speakers to small, be sure that your subwoofer setting is not "none" or something to that effect. Also ensure that the subwoofer level is not attenuated. Play some really bass heavy and see if it makes the sub amp light up.

That did it! The front speakers were set to large so I set them back to small and voila! Booming bass. Thanks for the speedy replies and help to all.

[chasw98]

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