[CDA325i]

Hello fellow BMW audio enthusiasts! I recently purchased a Helix DSP and am stuck on getting it to work the way I want. I am sure it is something simple but I thought I would put it out there and hope that someone has done something similar or has experience with them. Here is the setup:

Car is an '06 325i (e90) with Hi-fi system.
I am using the Technic harness to the Helix. Only using front RCA inputs to go out to front mids/tweets and under seat subs (4 outputs total). I have the front mids/tweets high passed and the 8" under seat band passed. I am using a 4 channel amp to run them. My problem is, the subs are not working. I get no sound out whatsoever. What am I missing???

Thank you SO much for any help you can provide!

[cdgatti]

can you do a screen shot of the main set up screen showing the crossovers for both sets of outputs?

[ctuna]

You are not being specific with equipment.
You must list model numbers and the way its hooked up.
What amps you have , What speakers you have and the model numbers .

[taibanl]

Im betting your input section is in 4channel mode not 2 channel mode

[CDA325i]

Originally Posted by taibanl

Im betting your input section is in 4channel mode not 2 channel mode

Good call, taibanl! I will see if I can find that adjustment. I snapped a couple pics of the screen but have forgotten how to post pics. Haha! I will see if I can fet tehm from my phone to the forum. Thanks all!

[CDA325i]

Originally Posted by ctuna

You are not being specific with equipment.
You must list model numbers and the way its hooked up.
What amps you have , What speakers you have and the model numbers .

I meant to say that I am running all stock speakers (except for rears) and using a HiFonics Olympus as the 4 channel. I bypassed amp crossover to use the dsp's feature.

I am only using front RCA from harness into Helix. 4 channels are coming out. 2 channels are high passed and the other 2 are bandpassed.

[CDA325i]

Originally Posted by cdgatti

can you do a screen shot of the main set up screen showing the crossovers for both sets of outputs?

Here you go, cdgatti. See what you think of this setup.

[cdgatti]

Originally Posted by CDA325i

Here you go, cdgatti. See what you think of this setup.

That looks fine, how about the input/output matrix screen?

[CDA325i]

Originally Posted by cdgatti

That looks fine, how about the input/output matrix screen?

Here you go......

[Technic]

Originally Posted by CDA325i

Here you go......

Why are you not using the rear OEM HU outputs as the rear inputs of the DSP?

There are no front inputs going into channel 3/4 outputs. That's the problem. By the way, the input/output settings are indeed in Page 20: http://www.helixhifi.com/downloads/a...ol_eng_web.pdf

[CDA325i]

Originally Posted by Technic

There are no front inputs going into channel 3/4 outputs. That's the problem.

Whay are you not using the rear OEM HU outputs as the rear inputs of the DSP?

Forgive my ignorance but don't I need amplifier channels to each of the outputs? If so, I don't have enough at this time. And I don't plan to use the rears in the future. So how do I attain front inputs for channels 3 & 4? By using an RCA wye adapter? The way I understood the function of the DSP is that it will generate the signals internally (from 2 inputs to 4 outputs).

P.S. Please ignore your PM Technic. I sent it before seeing your reply on this thread. My apologies.

Also, it appears that the right side of last image was cut off. It reads: A/B Front L/R Mid and C/D Front L/R woofer. Is that the correct way?

[Technic]

Originally Posted by CDA325i

Forgive my ignorance but don't I need amplifier channels to each of the outputs? If so, I don't have enough at this time. And I don't plan to use the rears in the future. So how do I attain front inputs for channels 3 & 4? By using an RCA wye adapter? The way I understood the function of the DSP is that it will generate the signals internally (from 2 inputs to 4 outputs).

P.S. Please ignore your PM Technic. I sent it before seeing your reply on this thread. My apologies.

\
Either:

A) Plug the rear harness RCA into the DSP ch C and D inputs.
B) Set the output section of the DSP ch C and D to Front L Full and Front R Full instead of Rear L Full and Rear R Full.

[mathematics]

You have C and D set to use Rear R and Rear L when they should be Front R and Front L. That's why you have no sound. You have it set to use rear inputs but you have no rear inputs.

[CDA325i]

Originally Posted by mathematics

You have C and D set to use Rear R and Rear L when they should be Front R and Front L. That's why you have no sound. You have it set to use rear inputs but you have no rear inputs.

I see that now. I was sure I had it set to Not_Used but you are correct, it should be set to front full. I need to delete my other .afp files and just keep the ones I know are correct. lol! I might have chosen the wrong one for this photo.

Thanks mathematics!! I will try that when I get home tonight!

[mathematics]

No problem. That's 100% why you have no sound, provided everything else is working properly

[CDA325i]

Originally Posted by Technic

\
Either:

A) Plug the rear harness RCA into the DSP ch C and D inputs.
B) Set the output section of the DSP ch C and D to Front L Full and Front R Full instead of Rear L Full and Rear R Full.

Most excellent!! Makes sense now. BUT, I am going to add subs (along with a 2 channel sub amp) as soon as I get the box built. How will I get that incorporated into my DSP? I am out of RCA input cables.

[Technic]

Originally Posted by CDA325i

Most excellent!! Makes sense now. BUT, I am going to add subs (along with a 2 channel sub amp) as soon as I get the box built. How will I get that incorporated into my DSP? I am out of RCA input cables.

DSP can create 8ch outputs with just 2 inputs... that's the whole purpose of the input screen that you posted a photo of in post #9.

Again... read page 20. Everything is there.

[CDA325i]

Originally Posted by Technic

DSP can create 8ch outputs with just 2 inputs... that's the whole purpose of the input screen that you posted a photo of in post #9.

Again... read page 20. Everything is there.

Sorry, but Page 20 is doing nothing for me. Otherwise I would have it figured out by now. I am not a complete idiot but sometimes it takes a while for a new concept to sink in. It will become clear with everyone's help and it will be like the clouds have parted. haha! Another silly question, you say that I can create 8 outputs with 2 inputs so why would I need to plug in the rear RCA inputs from harness? That is why I thought I could get it done with just the fronts RCA.

Edit: That configuration pic could be incorrect. I was in a hurry this morning to post it up from my laptop and might have chosen the wrong config file.

[cdgatti]

Also for the matrix selection... you need to use every box on the line. For example for your front left underseat, choose 'front L full' in every box, I know it sounds redundant, but that is the only way the output will get the full power signal. Do not select 'not used' in any of the boxes on that line.

[Technic]

Originally Posted by CDA325i

Sorry, but Page 20 is doing nothing for me.

You need to keep reading... input/output section starts at page 20.

Otherwise I would have it figured out by now. I am not a complete idiot but sometimes it takes a while for a new concept to sink in. It will become clear with everyone's help and it will be like the clouds have parted. haha! Another silly question, you say that I can create 8 outputs with 2 inputs so why would I need to plug in the rear RCA inputs from harness? That is why I thought I could get it done with just the fronts RCA.

Edit: That configuration pic could be incorrect. I was in a hurry this morning to post it up from my laptop and might have chosen the wrong config file.

That's the "either" part of my reply, page 23:

"In the center of the input mask, you can allocate any of the input signals to each of the eight outputs A-H (NOX4 DSP: A-F). You can also use either the right or left mouse button to make this selection.

It is mandatory to allocate at least one input to every output that you like to use. If you add two or more input channels to one output, each input channel is weigthed equally. If you want to generate a sum signal for a subwoofer output from all four front and rear channels, then please choose this adjustment. If you like to generate a front center signal from both front channels then this adjustment makes sense.

You do not have to use all the inputs. It is entirely possible to generate all outputs channels from only two input channels. We recommend setting all unused inputs and outputs to “Not_used”.

[CDA325i]

Originally Posted by cdgatti

Also for the matrix selection... you need to use every box on the line. For example for your front left underseat, choose 'front L full' in every box, I know it sounds redundant, but that is the only way the output will get the full power signal. Do not select 'not used' in any of the boxes on that line.

Are you referring to the center portion of the input mask? The section under the Summation of Input Signals? According to the manual (pg. 21), it shows only the first box filled out and the rest are Not Used.

[cdgatti]

yea the center section. In a literature piece that i had from helix, it said to select a signal in every box of a line that is used in order to assure the output has full power. try it, can't hurt.