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#229240 - 11/09/08 11:52 PM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: myrison]
SirQuack Offline
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Registered: 01/29/04
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Exactly, many of the technical support folks rotate via phone schedule and aren't regular on the boards, if at all. Your best bet is to email or call the 800#.
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#272045 - 09/10/09 01:30 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: SolidState]
SolidState Offline
veteran

Registered: 11/08/06
Posts: 124
 Originally Posted By: SolidState
Hi EFalardeau!

Hey that's great to hear!!!

Hi JC,

With regards to Tom's suggestion, and again my knowledge is limited to Heathkits and highschool electronics, by connecting the hot to pin 2 of the XLR and the ground to pin 3 without using pin 1 would this not result in a 6 dB loss in signal? Would this not mean I'd have to set the volume knob to double on the Denon to achieve the same SPL?

Justin

PS How would this affect "gain structure" and "headroom" ?
Also I am curious what the affective pin out is when using a TRS 1/4 mono to RCA (included adapters) with the A1400-8's combo XLR/TRS Neutrik plug?


http://www.rane.com/note151.html

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#272076 - 09/10/09 08:06 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: SolidState]
terzaghi Offline
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Registered: 04/04/07
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Loc: Tulsa, Oklahoma
I thought you were gone for good?
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#272099 - 09/10/09 11:29 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: terzaghi]
CV Offline
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We missed him too much, so he came back to soothe us.
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#272120 - 09/10/09 08:39 PM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: CV]
Spoiler Offline
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Registered: 01/03/06
Posts: 680
Loc: South Florida

... by reviving a 10 month old thread. Welcome back, my link obsessed, doesn't lead to much... acquaintance. Now....go away?
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#272182 - 09/11/09 01:58 PM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: SolidState]
Jc Offline
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Registered: 06/27/06
Posts: 500
Loc: Sherbrooke, QC, Canada
 Originally Posted By: SolidState

Hi JC,

With regards to Tom's suggestion, and again my knowledge is limited to Heathkits and highschool electronics, by connecting the hot to pin 2 of the XLR and the ground to pin 3 without using pin 1 would this not result in a 6 dB loss in signal? Would this not mean I'd have to set the volume knob to double on the Denon to achieve the same SPL?



Hi,

I have quized Tom and fisrt he says that it is not a good practice to use XLR to RCA adaptors; secondly you are right it would be a 6dB drop. The adjustement on the Denon volume knob will depend on its gain structure.

Next time, you don't hear back from me, please, do not hesitate to email me at jc@axiomaudio.com
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#272411 - 09/14/09 09:21 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: Jc]
Murph Offline
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Registered: 10/05/06
Posts: 6738
Loc: PEI, Canada
Professionally answered JC given the controversy with this poster. Good job.
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#272412 - 09/14/09 09:28 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: Murph]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4842
Loc: Tulsa, Oklahoma
Your high school must have a very robust electronics program.
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#272596 - 09/17/09 12:53 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: terzaghi]
SolidState Offline
veteran

Registered: 11/08/06
Posts: 124
Thanks for the response JC. I ordered some Mogami 2549 and 3173 as well as some Vampire copper base RCAs and XLRs at 6mm and 9.3mm OD. I intend to terminate using example 17 from this rane corp article. Rane Corp Termination Article
My question is if I pinout the XLR in that manner will the Ice module go into balanced +4 dBm mode? From my understanding placing a 1/4" TRS mono RCA adapter, came boxed, will connect -10dBV line level source to pin 2 and bridge pin 1 and 3 in a hybrid TRS/XLR as on the back of the A1400-8. This will also using a single ended source via single conductor COAX (90% of consumer line level cable) connect pins 1 and 3 to coax ground/braid. No wonder it's so horrible using coax with that adapter. What is needed is two conductor UTP cable with braid. The thing is if I use the Rane example 17 pins 1 and 3 won't be bridged. Is this how the Ice module determines what mode to go into? Basically if pin 1 and 3 on xlr A1400 end are bridge does this make it go into consumer line level -10dBV mode OR is it hot pin 2 that triggers balanced pro line level +4dBm ? Also why did you guys package those adapters because they just turn the coax 90% will terminate with into a bloody antenna? I guess if you used two conductor "balanced" RCA (oxymoron IMHO) with open shield on one end it would work right... other than that with those adapters your screwed.

Solid-State


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#272600 - 09/17/09 03:24 AM Re: Axom A1400-8 amp hum from Denon AVR-4306... [Re: SolidState]
SolidState Offline
veteran

Registered: 11/08/06
Posts: 124
-10dBV mode OR is it hot pin 2

should read

-10dBV mode OR is it hot pin 1

How is the XLR terminated on the A1400-8? is Pin 1 signal ground and pin 3 chassis ground with hot pin 2?

http://www.rane.com/note151.html

In particular this is of interest...

"The second column in Figure 5 shows unbalanced outputs driving balanced inputs. Again, only shielded 2-conductor cable is used. The best case here has both ends of the shield connected to units whose shield is chassis-grounded (Figure 5e). Some may argue that the induced noise on the signal conductors may be injected into the "sending" unit through the unbalanced output stage. This is a function of the system and output circuit, and is quite likely. Disconnecting the shield at the unbalanced output might reduce this problem. (affecting my uncle with LC-1 and included adapters)

When units with signal-grounded shields are encountered, disconnect the shield at the signal-grounded end (Figures 5f & 5g). This keeps the noisy shield currents out of the audio signal ground. If both units involved have signal-grounded shields, you've entered the twilight zone again (Figure 5h). Support your one-end-only political party (Figure 5l)."

I intend to terminal at the A1400-8 XLR, Hot pin 2, signal ground pin 1 and shield to pin 3. On the source RCA single ended I intend to connect hot pin 2 to RCA tip and signal ground to RCA ring AND leave shield open/unconnected at the RCA. Is this the best way to avoid noise and have the Ice module go into -10dBV mode? Also why would Tom direct me to connect to Hot 2 with nothing on pin 1 and signal ground to pin 3? From my understanding this would result in Ice module going into +4dBu mode no? Why direct me to do this with no balun? I didn't do it as it's bad advice considering I'm use -10dBV consumer line level. Other than the -6db result could this not damage the input and output stages on each device?



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