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#226222 - 10/21/08 08:26 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: St_PatGuy]
peenerhead Offline
buff

Registered: 10/19/08
Posts: 44
OK, last night I hooked up the loaner amp (Denon 2809). The setup is the same as in my 1st post except that I took out the extra set of M80s. I powered everything up and now the subwoofer (HSU Research VTF-3 MK3) does not respond. The cable is from the Pre-Out SW. The HSU has power to it but just doesn't do anything. My first inclination is that something blew inside the sub (of coarse). Is there a way for me to verify that the Denon is actually sending a signal to the sub? I have a Fluke 79 III multimeter for signal testing.

Thanks
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#226223 - 10/21/08 08:41 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: peenerhead]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
Are your sure you have it on the Sub "Preout", and not one of the other sub jacks like Ext In?
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#226224 - 10/21/08 08:47 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: SirQuack]
peenerhead Offline
buff

Registered: 10/19/08
Posts: 44
 Originally Posted By: sirquack
Are your sure you have it on the Sub "Preout", and not one of the other sub jacks like Ext In?



Yup, I'm sure.
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#226225 - 10/21/08 09:16 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: peenerhead]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16280
Loc: Leesburg, Virginia
If you clip your fluke to the center pin and the side of the RCA cable attached to the SW pro-out, then you'll detect voltage swings if there's signal on the cable.
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#226227 - 10/21/08 09:33 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: pmbuko]
peenerhead Offline
buff

Registered: 10/19/08
Posts: 44
I assume I set the meter to DC volts?
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#226228 - 10/21/08 10:26 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: peenerhead]
pmbuko Offline
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Registered: 04/02/03
Posts: 16280
Loc: Leesburg, Virginia
No. Audio uses AC to push and pull drivers past their neutral resting position.
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#226229 - 10/21/08 10:36 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: pmbuko]
peenerhead Offline
buff

Registered: 10/19/08
Posts: 44
 Originally Posted By: pmbuko
No. Audio uses AC to push and pull drivers past their neutral resting position.


Even though this is not the signal that is doing the pushing and pulling? If it is AC, what range should I expect mV or V?

Thanks
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#226232 - 10/21/08 11:49 AM Re: I just blew my amp (Denon 4308CI) now what? [Re: peenerhead]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3188
Loc: Toronto/New York/Dwight
Hi peenerhead,

The "Subwoofer Out" level is typically in the 200-mV to 2-volt range. It's supposed to be standardized, but there are wide variations from one brand of gear to another.

Regards,

Alan
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#226233 - 10/21/08 12:18 PM Re: I just blew my amp (Denon 4308CI) now what? [Re: alan]
peenerhead Offline
buff

Registered: 10/19/08
Posts: 44
Thanks Alan,

In addition I would also like to post the response from Hsu Research because I thought it might be helpful to someone else in the future.

"Hook up a DVD player's analog outputs directly to the sub using a different cable. If it still does not have any sound, take out the woofer and connect that to your receiver. If that plays fine (muffled, but clean), then its the subwoofer amp. "
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#226237 - 10/21/08 01:53 PM Re: I just blew my amp (Denon 4308CI) now what? [Re: peenerhead]
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4829
Loc: western canada
 Originally Posted By: peenerhead

After everything that has been posted (thanks to all) I think we can all agree...

WE NEED MORE POWER!


I distinctly disagree.
although it should have been obvious that running any electronic component at 100% could cause a malfunction [that combined load and power use would have seriously if not critically taxed the PSU of any receiver] why not look at the other factors affecting the 'problem' such as distance rather than trying to compensate with power?
you have to remember that in adding more power, speakers will come to their physical excursion limits which still may not produce the sound pressure levels that you would like to have 60 ft. away from your stereo system.

possibly what you need are either much larger speakers like those designed for rock concerts, or move closer to your stereo!

along that same line of thinking, move part of the system closer to you.
I don't understand why you have to be 60 ft. away to listen to sound pressure levels from four speakers when you can move half of them closer. Take your second set of speakers, move them closer, and only run one pair at a time off of the receiver depending on where you are in the room.

I have to agree with the limited comments here made about listening levels. the sound pressure level from four speakers playing that loudly can severely damage one's hearing
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