Minidsp Flex Output to Subwoofer

[TSD]

Hello All - I have a 2.1 system where the sub has a two RCA (Right/LFE) inputs. My miniDSP Flex outputs 3&4 could singly or both be used to send signals to the sub. And I need to get a longer sub cable. Thinking cable configurations: Are there pros/cons to combining (1) inputs 1&2 into output 3 out to the sub vs (2) sending input 1 to output 3 and input 2 to output 4 and using a dual cable (4 jacks) vs a single cable (RCA jack on each end)? Thought I would do option one (per the miniDSP instructions) for sub integration. Should I be using a one jack to two cable? One to one cable? Will option two not work the way I think because I'm attempting to send two channels into one (at the sub)? Thank you in advance!

 

[madrac]

Are you sending the Wiim Pro L/R outs into the Flex and then Flex outs 1 & 2 to your Left & Right main speakers and Flex out 3 to the sub? in other words, trying to integrate mains and subs with the Flex? in any case, only 1 output from Flex to 1 sub input

 

[Anthony LoFi]

Hi TSD, Welcome to ASR.

The first thing to do is correctly understand how your active sub uses its two RCA inputs.
Most subs have two inputs for the summation of both L & R channels from your preamp. in you case your Flex stereo inputs being able to be routed to the 4 outputs.

Read your sub instructions from the manufacturer.
Usually the L sub input is mono and the second R input is summed internally by the sub active controls to mix both L & R channels.

As I understand it, I think you know this but are asking how to physically connect your Flex to your sub?

Your two proposed methods would both work and I believe have the same audio outcome.
I think simpler is better, so routing the Flex stereo inputs L & R to both outputs to output 3, with one RCA cable going to your sub mono input RCA.
I don't think there is any benefit being able to correct each sub channel to the two (3&4) Flex outputs where you can individually adjust gain, PEQ or cross-over them to your sub actives summing them to drive your speaker.

Others here may have ideas Im not aware of that do have a benefit in using two channels feeding you sub.

You will have other issues to experiment with in deciding on your cross-over filters frequency and types (12db/octave - 49 db/octave).
Also physical placement time delays if needed and gain structure.
You seem to have read up on sub implementation which miniDSP has a wealth of information.

All the best.

 

[TSD]

Hi TSD, Welcome to ASR.

The first thing to do is correctly understand how your active sub uses its two RCA inputs.
Most subs have two inputs for the summation of both L & R channels from your preamp. in you case your Flex stereo inputs being able to be routed to the 4 outputs.

Read your sub instructions from the manufacturer.
Usually the L sub input is mono and the second R input is summed internally by the sub active controls to mix both L & R channels.

As I understand it, I think you know this but are asking how to physically connect your Flex to your sub?

Your two proposed methods would both work and I believe have the same audio outcome.
I think simpler is better, so routing the Flex stereo inputs L & R to both outputs to output 3, with one RCA cable going to your sub mono input RCA.
I don't think there is any benefit being able to correct each sub channel to the two (3&4) Flex outputs where you can individually adjust gain, PEQ or cross-over them to your sub actives summing them to drive your speaker.

Others here may have ideas Im not aware of that do have a benefit in using two channels feeding you sub.

You will have other issues to experiment with in deciding on your cross-over filters frequency and types (12db/octave - 49 db/octave).
Also physical placement time delays if needed and gain structure.
You seem to have read up on sub implementation which miniDSP has a wealth of information.

All the best.

Thank you. I will keep it simple And yes, i have several other issues to work on!

 

[TSD]

Are you sending the Wiim Pro L/R outs into the Flex and then Flex outs 1 & 2 to your Left & Right main speakers and Flex out 3 to the sub? in other words, trying to integrate mains and subs with the Flex? in any case, only 1 output from Flex to 1 sub input

Yes, that’s correct. I will make it one out, one in connection. Thanks