AVR-3806 help

[jpaul]

I have the Denon 3806, I haven't yet purchased the speakers I want, so
for right now I've got my old speakers. Unfortantly, they are Bose
5.1 system (about 10 yrs old).
I don't think these speakers (and sub) can handle this AVR.
On several occations when I was watching a movie my Denon reciever just shut off.
I spoke with a Denon tech and he seem to think that the shut off
is a safety feature when it gets feedback. In other words, it was sending out a
certain amount of power to the sub, the bose sub couldn't handle it and sent it back
to the reciever. The reciever automacally shuts down to prevent damage.
Can anyone verify this? should I send this unit back for repairs?

 

[MDS]

I spoke with a Denon tech and he seem to think that the shut off is a safety feature when it gets feedback. In other words, it was sending out a certain amount of power to the sub, the bose sub couldn't handle it and sent it back to the reciever. The reciever automacally shuts down to prevent damage.

The Bose sub is passive (doesn't have its own amplifier) and needs to be powered by the receiver. What is likely happening is that the impedance of the sub and its satellites is too low causing the receiver to try to deliver more current than it can do continuously and it gets hot and trips it's internal protection circuitry.

 

[jpaul]

re:

Thanks for the reply,
It sounds like the Denon tech was right. Is there any chance that
this may cause damage to my reciever?
I want to purchance new speakers ASAP but it may be next year due
to cost.

 

[Nick250]

Great receiver, I own one and never had a shut down. Include a powered sub and the two front main speakers as top priorities IMO.

Nick

 

[Nick250]

Thanks for the reply,
It sounds like the Denon tech was right. Is there any chance that
this may cause damage to my reciever?
I want to purchance new speakers ASAP but it may be next year due
to cost.

If you can not replace the speakers, return you receiver if you can, take that money and buy a $300 receiver and invest the rest on two main speakers. It's crazy to spend that much on a receiver at this point.

Nick

 

[jpaul]

re:

Thanks for the advice.
Good Idea, but its to late for return. I've already paid it off. I got this
with the TV at the same time.
It want be long till I get the speakers (using a loan). But
due to holidays it may not be till febuary. I'm leaning towards
def. techs and possibly the SVS tube sub., or I may buy a sub kit through
Madisound. I'm researching this.
If this would damage the reciever I may pull the bose off completly
and put (2) sat. speakers on it. I may be able to
get some for a good price temporaly.

 

[zildjian]

How high is the volume turned up when it has cut off? The protection circuit on mine cut off a few times when I was pushing it to see how it handled a big 5 channel load at pretty high dB's, but other than at really loud volumes, it should handle 4 ohm speakers. If the volume isn't high when this happens, recheck all the speaker wiring to make sure it's correct and secure. I know that is elementary to suggest, but it's an easy problem to arise either by a wire pulling out from a terminal (your bose have spring loaded terminals so the wires pull out easy) or just from an oversight when hooking things up quickly to get to the fun part of listening.
Brad

 

[jpaul]

re:

The first time the volume was fairly high, I was watching the new x-men 3
movie. But the last time I was waching a movie and it wasn't on a action
scene, while I was turning it up the system shut down. No loud sound involved.
This one concerned me.

 

[agarwalro]

Sorry to hear that you are getting grief from your setup.

The reason is most definitely related to the mismatch between the Bose speakers and the Denon receiver. IMHO, get rid of the speakers and invest in a 5.1 set of "conventional" speakers. Try putting up the Bose on Ebay, you should be able to recover most of what you spent on them.

There are many brands that have a good rep on the forum here, AV123, Axiom, SVS, Hsu, Def Tech, PSB, etc. to name a few.

 

[jpaul]

Thanks, I definitely agree! When I have the sound down (normal hearing level) then there is no problems, So I think it's a compatability issue.
I'm going to start a search for the right speakers and sub.
I'll place the bose on e-bay. I should add a disclaimer to the bose.
But, I'll sell them as is. Thanks again for the help.

 

[jcPanny]

Bose connections

jPaul,
The Bose speakers are designed to be connected through the "Bass module". The bass module is not really a sub, think of it as the Mids in a two way speaker and the cubes are the tweeters. Connect the receiver to the Bass Module and Bass module to the receiver and you shouldn't have any impdance issues.

If you are connecting the cubes directly to the receiver, use the highest crossover setting possible (they cut off at 200 Hz) and try to set your receiver in the 4-6 ohm impdance mode.