for people who have an amp installed.

ginxer86 · 06-09-2010, 10:24 PM

To have your amp installed to your factory deck did you have to use the LOC (high low convertors?)
and does it make a hissing noise when low volume is on? because my gf's mazda just recently got an amp and sub installed with the factory deck and it makes noise.

fdriller9 · 06-10-2010, 09:05 PM

LOC? Yes.
Noise? No.
It could be a bunch of things...I would start by checking the ground for the amp and the placement of the RCA cables. Are the RCAs crossing over any power cables? Was this noise present without the amp/sub?

ginxer86 · 06-10-2010, 10:42 PM

Quote:

Originally Posted by *********

LOC? Yes.
Noise? No.
It could be a bunch of things...I would start by checking the ground for the amp and the placement of the RCA cables. Are the RCAs crossing over any power cables? Was this noise present without the amp/sub?

no noise before the amp/sub install

kaigoss69 · 06-10-2010, 11:37 PM

Noise usually is the result of improper level setting.

VP Electricity · 06-11-2010, 11:33 AM

Noise often occurs when a low-voltage preamp signal (like in many Mazdas with Bose) is run through a transformer-based LOC with attenuation. The signal is attenuated needlessly, the gain must be turned up to hear music, and the hiss is then audible because (as kaigoss points out) the gain is too high.

06-09-2010, 10:24 PM	#1
ginxer86 Private 32 Rep 88 Posts Drives: 06 BMW 323I Join Date: Feb 2010 Location: Toronto iTrader: (0)	for people who have an amp installed. To have your amp installed to your factory deck did you have to use the LOC (high low convertors?) and does it make a hissing noise when low volume is on? because my gf's mazda just recently got an amp and sub installed with the factory deck and it makes noise.
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06-10-2010, 09:05 PM	#2
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	LOC? Yes. Noise? No. It could be a bunch of things...I would start by checking the ground for the amp and the placement of the RCA cables. Are the RCAs crossing over any power cables? Was this noise present without the amp/sub?
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06-10-2010, 11:37 PM	#4
kaigoss69 Brigadier General 300 Rep 3,969 Posts Drives: '08 335i Join Date: Jul 2008 Location: JAX iTrader: (6)	Noise usually is the result of improper level setting.
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06-11-2010, 11:33 AM	#5
VP Electricity Brigadier General 289 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	Noise often occurs when a low-voltage preamp signal (like in many Mazdas with Bose) is run through a transformer-based LOC with attenuation. The signal is attenuated needlessly, the gain must be turned up to hear music, and the hiss is then audible because (as kaigoss points out) the gain is too high.
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