KX750.5 ???

[chpthril]

Philwsails,

Last time we talked, I was trying to run a single input pre-out to the kx750.5 (runs the 6 cabin spkrs) so I could control the the volume in the boat using a Bass Control knob.

Well, here is my dilemma no matter which pre-out from the H/U I use, front, rear, non-fade, or whether I plug into "amp 1" "amp 2" or bridge 1 and 2, one of the output channels drops out, and it is always a different one depending on what wiring config I use. Any ideas guys.

Other than that, the system is kickin' @$$

[philwsailz]

That is weird. That amplifier should have pre-amp signal transfer if you connect straight to AMP1 input, allowing all channels to receive signal. Something is amiss....

I might suggest picking up a set of inexpensive single-female to dual-male RCA y-cords and see if the problem goes away.

Hmmm.... I need to think on this more....

BTW, the bass control know will only adjust the output of the fifth channel; the digital subwoofer section. It will not control the volume of the full range channels...

[chpthril]

That is weird. That amplifier should have pre-amp signal transfer if you connect straight to AMP1 input, allowing all channels to receive signal. Something is amiss....

I might suggest picking up a set of inexpensive single-female to dual-male RCA y-cords and see if the problem goes away.

Hmmm.... I need to think on this more....

BTW, the bass control know will only adjust the output of the fifth channel; the digital subwoofer section. It will not control the volume of the full range channels...

it is weird

I'm using a Bass Knob inline between the H/U and the amps like MRMoffit1 did

[philwsailz]

Odd as it sounds, that might cause it. I am not sure why at the moment, as I am not quite sure how the signal transfer is accomplished at the front end of the amp, but you just might be on the root cause.

If you go the y-cord route, it should take care of it.

You still have my work number, right? Ring me. If not, PM me yours and I can ring ya-

[spharis]

Isn't there a switch to make the channels use the single input for all on that amp? It probably isn't on. Are you sure it's a 750.5, and not a 700.5.......I don't see a 750.5 in the manuals.

edit****
looks like Kicker doesn't have those switches on their amps. You will have to have 2 splitters like phils is referring to. It looks like this:

Split the left and right into respective channels on the amp inputs. The colors will not match up, just do each a left and each a right.
I find it odd that Kicker doesn't have a passthrough or a single input switch on their multi channel amps.


another edit*****
You use Kicker amps on a single input on the ZX line, but not the KX according to the manuals. I don't see anywhere in the KX manuals that you can use a single input. The ZX manual has this:

If you are using only one pair of RCA
inputs, connect the RCA cable to the AMP 1
inputs. All three (or five ZX700.5) channels will
work with a single pair of RCA input cable; the
fader will not operate.

This falls in line with the loss of a channel when you change your wiring. Buy the splitters, and reset your gains.

[philwsailz]

I find it odd that Kicker doesn't have a passthrough or a single input switch on their multi channel amps.

The amps do provide for automatic pass-thru. It is automatic, sort of like a normalizing patch bay, but different still. I can only speculate, but would guess that the impedance of the trim pot is somehow affecting the amp's ability to "understand" that it needs to go ahead and pass the signal to the rest of the amp channels.

That being said, It seems to me that it still ought to work even with the trim pot volume controls. The y-cord solution will provide a good solution, and if it doesn't, points to another problem, possibly in the front-end of the amp, or possibly in the RCA's.

Scratching my head for sure, still....

[spharis]

Do you have a doc you can double check? Maybe a tech pub has the required input to force the auto switching (although I would think it would be very very low, and that pot wouldn't matter).

It isn't in the manual and it is clearly stated in the other manual. Makes me think it isn't supported on the KX line.

[philwsailz]

I don't find it in the owner's manual either, but I DO find it in my training files. I also checked with my amp guru, and he shared that the 5-channel amps have always had signal pass-thru.

I can't imagine the feature is messed up, but it is possible. I am at a loss...

[spharis]

Chpthril, what happens if you are in amp1 input, and turn the in-line volume control to max, then power everything on? That should set the pot's resistance to minimal, and should not affect the line level going to the amp.

Other thing to try is to remove the volume control and substitute a patch cable to see if the switch kicks in.

Phils the switch on that pass-through should be solid state and sensing the ground on the input of amp2 to switch, right? I wouldn't think it would fail.

[philwsailz]

Chpthril, what happens if you are in amp1 input, and turn the in-line volume control to max, then power everything on? That should set the pot's resistance to minimal, and should not affect the line level going to the amp.

Good suggestion; I am glad you pointed to a trouble-shooting step to take.

Let us know!!!

[philwsailz]

Phils the switch on that pass-through should be solid state and sensing the ground on the input of amp2 to switch, right? I wouldn't think it would fail.

I agree completely, I can't imagine something that simple just failing. If though, we have the volume controls wired as pots rather than variable resistors, do we not have the potential to float the ground a little?

I wish I had the stuff in front of me on a bench, just to replicate.

[chpthril]

First, no knobs installed yet. I have this symptom with the pre-outs going straight to the amp.

It does it with all 3 of my cables that are already plugged to the H/U and run to the amps by the factory. I simply unplugged them from the amps and tried all 3 in the various configs.

I will try the "Y"'s, I think I have 2 around here.

Thanks for the input and ideas guys.

EDIT: my bad guys, it is a KX700.5 (tower is a 350, that's where the "50" came from) got a good memory........just short

[spharis]

Sounds like the pass-through feature is not working.

Philz, are you absolute that it has the feature?

the volume controls wired as pots rather than variable resistors, do we not have the potential to float the ground a little?

Ha...depends on the style/brand I suppose.

[philwsailz]

Sounds like the pass-through feature is not working.

Philz, are you absolute that it has the feature?

Honestly, I am not 100% totally certain! AAARGH!!!!!!! Three-year-old model....

Actually, I know for sure it can be added as an accessory... with y-cables

[philwsailz]

Sounds like the pass-through feature is not working.

Philz, are you absolute that it has the feature?

Ha...depends on the style/brand I suppose.

BUT... Chpthril says he is having the problem without the volume controls installed yet. I think we can rule that out, for the time being....