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#201154 - 03/20/08 09:51 AM Re: EP350v2 versus EP350v3 specs [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
Yes, I assumed you have cable TV. I don't think we get HDOA up here yet.

All subs have input impedance. The higher the input impedance on your sub, the more load on your receiver's sub output. Splitting with a Y cable doesn't make a difference. The receiver sees the same load.

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#201166 - 03/20/08 12:01 PM Re: EP350v2 versus EP350v3 specs [Re: SirQuack]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 851
Loc: Toronto
 Originally Posted By: sirquack
Jakeman, calling Jakeman, any ideas. \:\)


I'm only checking in every few days because I'm still holidaying in FL.

In any event Mojo answered your question about why FR changed when you unplug the 600. Its how the waves are interacting betweent the subs. You want the nodes to lessen in the room which happens when a peak and null originating from different subs interact, reinforce or cancel. The fact that you have a peak at 40hz means you need to tweak placement or phase some more.

About the hum. Not much you can do if it occurs when you are plugging subs into different outlets. To get rid of hum in my HT I ran extension cords from one outlet to get several subs on the same ground. Some people use cheater plugs with the ground removed. Also using surge suppressors with 60hz filters on every outlet sometimes helps keep down hum. If it persists I would suggest relocating the subs away from the fronts rather that listen to hum from a speaker.
_________________________
John

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#201167 - 03/20/08 12:27 PM Re: EP350v2 versus EP350v3 specs [Re: jakeman]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
A surge suppressor with a 60Hz filter would prevent AC power from reaching the appliance since AC power is 60Hz on this side of the planet.

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#201170 - 03/20/08 12:42 PM Re: EP350v2 versus EP350v3 specs [Re: Mojo]
jakeman Offline
aficionado

Registered: 10/03/05
Posts: 851
Loc: Toronto
Understood. Some surge suppressors have filters to reduce line noise which contributes to the hum. After I installed one, hum at one of my subs dropped so it was no longer noticeable.
_________________________
John

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#201203 - 03/20/08 05:52 PM Re: EP350v2 versus EP350v3 specs [Re: jakeman]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
Jakeman, this would make sense if the 600 was actually running. I have it turned off and unplugged. When I remove the Line In coax that is coming form my 2nd 350, the SMS-1 graph jumps and pegs from 30-50 hz or so. None of the subs are running through the sms-s, just watching the graph.

As soon as plug the coax back in, it tames down, I still have the 40hz hump.

I left you an audix at your home.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#201204 - 03/20/08 06:11 PM Re: EP350v2 versus EP350v3 specs [Re: SirQuack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
I have a dedicated 20am circuit running my AV area. The only thing plugged into my TrippLite HTPowerbar10 is my receiver and cdplayer and projector. My Odyssey amps and subs are plugged into other outlets in the room on the same circuit. The 600 is actuall in the back of the room on a different circuit.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#201207 - 03/20/08 07:22 PM Re: EP350v2 versus EP350v3 specs [Re: SirQuack]
Mojo Offline
connoisseur

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

To limit or eliminate the effect of a ground loop, all of your audio equipment should be powered from the same branch. And to eliminate or limit the effect of conducted noise and transients, no other load (eg. a blender \:\) ) should be placed on that branch.

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#201209 - 03/20/08 07:28 PM Re: EP350v2 versus EP350v3 specs [Re: Mojo]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
By branch I assume you mean outlet on the same circuit? For all the subs I've used, the 350v1, ep500, ep600, and now 350v3', they have always been plugged into an outlet installed in my riser which is on the same 20amp circuit to the HT room

I have never heard this noise until now and nothing has really changed. All my other audio equipment is hooked up in the AV closet to the tripplite, except the Odyssey amps straigh to the wall.

No other products, blenders, refrigerators, microwaves, etc. are on this circuit, branch, or tree.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#201217 - 03/20/08 09:11 PM Re: EP350v2 versus EP350v3 specs [Re: SirQuack]
Mojo Offline
connoisseur

Registered: 01/21/07
Posts: 3292
Each branch has its own breaker.

Maybe you should try adding a blender. The emissions from the blender may destructively interfere with the sub noise \:D .

If it makes you feel any better, I have a slight hum with my 600 but it never interferes with listening. As a matter of fact, no one notices it unless I point it out to them.

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#201219 - 03/20/08 09:15 PM Re: EP350v2 versus EP350v3 specs [Re: Mojo]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10394
Loc: Calgary, Alberta
Mojo, didn't you say the hum disipated when the lights were turned off or maybe that was someone else? I keep meaning to bringht the PF60 down to see if it actually helps with noise issues.
_________________________
Jason
-----------------
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My HT

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