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Ground Q/A sticky


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TubeDriveRMD 
Member - Posts: 8
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Joined: August 18, 2004
Location: United States
Posted: August 21, 2004 at 4:33 PM / IP Logged  

Ok Rob......here is where im at.........

i followed your suggestion and bypassed the line driver and crossover.   i used RCAs directly out of HU to the front stage amp and DEAD SILENCE ...well except for the music!  I then bypassed the line driver only (RCAs HU to xover)(xover XLRs to front stage amp) and whine+noise floor returns!

taking this information into account with previous knowledge that iPod source --> line driver --> xlr --> xover --> xlr --> front stage amp also = dead silence.................is there a "loop" between the xover and HU?  if one or the other is taken out of the signal chain, all is well. if both present = unlistenable.

another tidbit,  the HU rear outputs --> rca --> ads 250mx --> rear fill has never had whine+noisefloor

i didnt perform the install, but it is a very safe bet all amps and xover are grounded same spot in trunk through distribution ground block (same should go for power dist block).

So..........any new suggestions???  thanks for everyone's input!!  this noise issue is killing me!!!

jason 

Eclipse cd8443
Phaze LD1 line driver
Phaze LDX-23 Xover
Butler1500 TubeDriver (2)
Dynaudio 220
Boston Pro 10.4LF
Zu Cable balanced XLR cables
Kimber Kable speaker wire
forbidden 
Platinum - Posts: 5,352
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: November 01, 2003
Location: Alberta, Canada
Posted: August 21, 2004 at 6:31 PM / IP Logged  

Processors are usually a breeding ground for noise for the most part. Try as well bypassing the crossovers. Head ----> line driver ----> amps. What happens? With a Eclipse like you have that line driver is probably not even necessary (unless I am missing something). I would be looking very carefully at that crossover myself.

Top Secret, I can tell you but then my wife will kill me.
TubeDriveRMD 
Member - Posts: 8
Member spacespace
Joined: August 18, 2004
Location: United States
Posted: August 21, 2004 at 7:24 PM / IP Logged  

well..........i could scrap the xover.  if i could solve the problem without getting rid of it would be preferred method.  Simply because it matches the amp perfectly (cosmetically) and the glowing tubes are sweet.   and b/c without the xover the whole balanced xlr system (read = unique) braggin rights are lost. its like tearing the personality out of the install. however, the most important thing is clean sound obviously.  so  why do you think the xover doesnt add any noise or whine when the ipod is the source and the HU is bypassed???  it doesnt make any sense to me that this is occuring.

regarding the line driver, it does make a huge difference. the eclipse advertises 8V but occurs at high volumes. the line driver goes between 10 - 16 volts depending on the gains (i set them low) AND they convert the signal from RCA to XLR. and they add 'tube warmth' characteristics to the sound.

Eclipse cd8443
Phaze LD1 line driver
Phaze LDX-23 Xover
Butler1500 TubeDriver (2)
Dynaudio 220
Boston Pro 10.4LF
Zu Cable balanced XLR cables
Kimber Kable speaker wire
TubeDriveRMD 
Member - Posts: 8
Member spacespace
Joined: August 18, 2004
Location: United States
Posted: August 21, 2004 at 7:47 PM / IP Logged  
there is one up for grabs on ebay. maybe i should grab it.
Eclipse cd8443
Phaze LD1 line driver
Phaze LDX-23 Xover
Butler1500 TubeDriver (2)
Dynaudio 220
Boston Pro 10.4LF
Zu Cable balanced XLR cables
Kimber Kable speaker wire
racer427 
Silver - Posts: 381
Silver spacespace
Joined: August 04, 2004
Location: United States
Posted: August 21, 2004 at 7:52 PM / IP Logged  
What should be the maximum resistance for the ground wire?
Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds
Teken 
Gold - Posts: 1,492
Gold spacespace
Joined: August 04, 2002
Location: Aruba
Posted: August 21, 2004 at 8:22 PM / IP Logged  
The ideal potential difference should be 0 ohms. Realisticly, that is impossible since component parts, vehicle design, and cable diameter / materials dictate as to what you obtain as to resistance.
Generally speaking, if you can obtain 1 ohm and below, you are doing alright.
Regards
EVIL Teken . . .
racer427 
Silver - Posts: 381
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Joined: August 04, 2004
Location: United States
Posted: August 21, 2004 at 8:51 PM / IP Logged  

Ok, great, I am reading 1ohm through the cable at the amps. So, all is good.

  Thanks for the info.

Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds
pimpincavy 
Silver - Posts: 880
Silver spacespace
Joined: May 20, 2004
Location: United States
Posted: August 22, 2004 at 1:27 PM / IP Logged  
Is it ok to solder a ground to the car, or should I bolt it on? Its a ground for a amp.
auex 
Platinum - Posts: 5,041
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: December 23, 2002
Location: Arizona, United States
Posted: August 22, 2004 at 3:05 PM / IP Logged  
Solder probably isn't a good idea, you could weld it though. Bolting the ground is going to be the easiest best ground.
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pimpincavy 
Silver - Posts: 880
Silver spacespace
Joined: May 20, 2004
Location: United States
Posted: August 22, 2004 at 4:55 PM / IP Logged  
Well I soldered one of my grounds, seems to be workin so far, adn it couldnt be any worse then the way I had it before lol. But the ground wire have for my speaker amp isnt copper, and the solder I have is crappy, so I couldnt get it to stick....so it looks like a bolt for this one.
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