My dad has a Denon Al24 processing receiver. We have had the receiver about three years. The problems I have found so far are that the sub channel coming out of the receiver has continual hum that is louder than the music. Also it''s very very quiet. When we first got it half way was really loud, but know you have to crank it all the way and it's still really really quiet. peace, matt

Has the subwoofer channel been switched off. It's easily done. Are you certain the sub is working?

New lamp bulb won't shine.

you need another reciever/amp to power that sub, because that denon reciever is designed for a powered sub,. if you have another old reciever/amp laying around, you can connect the sub out from the denon into an auxillary input of any old reciever/amp, (switched to that input) with speaker wires from old reciever/amp to the passive sub

Does the receiver, Have a (RCA) Jack on the back of the unit ,Where it is written sub out,If it does, You need what is called a sub conecter patch cord to hook up the sub.If it is a powered sub, If the receiver does not have a sub jack you can not hook up a sub to it.

A Denon AVR 889 is not a sub so we don't know anything about the sub in question.

Maybe the existence of the sub is no longer set in the AVR. Look at the speaker definitions first before going to wild.

Try another cable to the sub.

OR, run the sub's signal supply cable to one of the Tape Outs on the receiver and tune in something on FM. If that works a) it will be loud, and b) go back to the SUB settings on the AVR.

Crack the sub open and access the terminals on the speaker itself. Disconnect them from internal components and run one of your amp channels directly to it. If it works, the amp or signal path are dead. If it doesn't work, it's a dead driver.

Sure, if you want to hear Surround Back program material coming from the subs without midrange or tweeters. (Sarcastic) Of course, the LFE program material will still be going into a black hole somewhere.

Run the subs in series with each other -
Sub Amp negative to 1st speaker negative;
1st speaker positive to 2nd speaker negative;
2nd speaker positive to amp positive.

Run the speaker level adjustments routine and enjoy.

Just for giggles, try what you were thinking about. You won't hear much from the sub(s) unless you programmed the Surround Back channel as full-range and then have something like the Apollo 13 launch for program material. Normal audio won't send much low-frequency material to those channels. The optimal place for subs is on the LFE or sub channel.

you caan either buy a SPLITTER OR JUST RUN A SINGLE LINE OUT OF THE RECIEVER INTO THE SUB. BOTH DONT NEED TO BE PLUGGED IN. SUBS ARE MONO NOT STEREO. THERS NOD IFFERENCE IN SOUND

in the Denon setup under speaker configuration set the sub to LFE+Main

Unhook the sub ! center speaker is for front sounds like the people talking. and a sub is for the bass like a bomb going off SO hook your sub to the sub out on your reciever. As far as the vcr..are the vcr inputs on the denon yellow? if so thats a video in (or) out but if its red or white thats for the vcr sound .