Well i have a Panasonic 6900ub and it's supposed to have 4 volts preouts.

Head unit is set at 46/62max.

But when i hook it up to the sundown amp i have to crank the gain knob pass 3/4 to get it to fully power up the SE sub at 2ohms.

It's set with a 60hz test tone with a cheapy sears dmm. (i don't have an o-scope).

RCA wires are from knuconcepts.

When i measure the rca volts from the end of the RCA i register only 200 milli volt.

why am i getting so little volts through my rca cable?

RCA cable is One 5 Meter Klarity Kable Blue OFC RCA Cable with Built in Turn On lead. and i have about 5ft of it wrapped up nicely cause it's longer then i need it to be.

Well, first things first, There is no such thing as a Panasonic 6900ub... but upon further research, you have a Pioneer DEH-6900ub.

Ok, first things first, is the subwoofer level control on the stereo turned on or if it is on, can it be increased?

Do not increase the bass, the stereo will have a sub on\off setting but somewhere either there or somewhere else should\might be a control to adjust the Sub output level. Check into that.

You generally won't see full preout voltage until right under the clipping threshold for the preamp.

i think that sounds about right to the OP on the HU volume ratio. my HU volume is set to 40/62 on an deh-7700mp with no additional bass settings. in order to get the correct amount of output from the amp my gains are set quite high. though the speaker isn't giving me any dirty sounds. so i feel that there isn't any clipping. i could but i don't think i am. and if i am. well god damn i love this sub as it takes a beating like no other.

BUT, you might have to set the pre output voltage on the HU as i had to on mine to actually get a better pre-output. in the audio settings look for something like this picture. it won't be the same as we have different HU's

set the SLA output to +4 and if needed set the AUX level to +4.

if this hasn't been done you should notice an increase in output. i believe it's what regulates what voltage you want to run. wether you like to set your amps at 2v or 3v. or 4v. ya know?

Edited March 11, 200817 yr by fbi90909

i think that sounds about right to the OP on the HU volume ratio.

What's OP?

my HU volume is set to 40/62

What does this mean? You listen between the volumes of 40 and 62?

set the SLA output to +4 and if needed set the AUX level to +4.

Why does the AUX have to be on +4?

i think that sounds about right to the OP on the HU volume ratio.

What's OP?

Original poster

my HU volume is set to 40/62

What does this mean? You listen between the volumes of 40 and 62?

set volume/max volume(headunits max is 62. i set my gains at volume 40)

set the SLA output to +4 and if needed set the AUX level to +4.

Why does the AUX have to be on +4?

if he ran an ipod or w/e aux input it would level out the Aux output to 4v

if he only sets the SLA, he could play a CD and get the needed output RCA voltage. but if he switches to Aux w/o setting to 4v he's going to get a bare voltage output. the SLA is a separate source from the AUX. which is why i said "if needed"

at first i used to run all CD's, then when i had got my ipod and run through the Ip-bus i have to use the AUX input. and w/o the setting done to the pre-output voltage i wasn't getting crap for audio until it was switched.

Edited March 11, 200817 yr by fbi90909