why is this?

[Neothin 10+ year member]

Setup-

AVIC-D2

NINe.1

NINe.2

eDi6500s comps

2x 10w6v2's

So i finally got around to resetting the gains on my amplifiers this afternoon. about a month ago i installed an AVIC-D2 into my car, and havent had the time to reset gains.

Previously I was running a stock headunit and a soundgate lineout converter that had 5v preouts.

anyways, the thing that has me questioning... when i reset my gains, i actually had to turn them down to get to the proper voltage. This is weird because the lineout converter had 5v preouts while the D2 only has 2v preouts. I thought because of the lower signal voltage, i would actually have to turn the gains up. I didnt have to turn them down by a little.. the voltage on the sub amplifier when i first looked at it was 64.something! (which really has me worried, because i ran around for a month with the gain set way over what it's supposed to).

all equalizer settings and such were completely flat on both headunits, so that idea can be thrown out.

i used the DIY in the stickies above, and come up with 20.97v for the component amplifier (sqrt(110x4)) and 36.05v for the subwoofer amplifier (sqrt(1300x1)). the reasoning for using higher wattages in the equation was because the eD amps are rated @ 12.5v.... so i used the wattage that they would produce if output stayed linear @ 13.5v.

anyone more knowledgeable than myself care to enlighten me as to why this happened?

Click to read more...

 

[squeak9798 5,000+ posts]

I'm not familiar with Soundgate LOC's....but my guess would be that it wasn't "5V output", but rather "up to 5V output".

Because you, apparently, are receiving a higher voltage signal with the AVIC than you were with the LOC.

Ofcourse you would have also needed to be sure you used identical test tones.

 

[Neothin 10+ year member]

yep, same CD, same test tone.

on the basis of "up to 5v", wouldnt the LOC still output more than the AVIC that puts out "up to 2v" though?

correction:

Features

The LOC4.4 offers user selectable dual-voltage (4v, or 1.5v) output, full bandwidth frequency response response, and extremely low distortion. Precision-tolerance components and sophisticated circuitry guaruntee the ultimate in performance. Inputs are convienant pigtail leads while outputs are high-quality gold-plated RCA connectors.

Maximum Input Wattage : 85 Watts

Frequency Range :17Hz-27kHz +0dB (-3dB at 12Hz)

Total Harmonic Distortion : less than 0.005% from 20Hz to 25Khz (0.0005% at 1Khz)

so it only has 4v outputs (and i definitely made sure that i used that, and not the 1.5v output), but still... 4v > 2v. so confuzzled *sigh*

regardless, everything is setup just fine now //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif