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-   -   JL Audio Fathom f113 Question (https://www.audioaficionado.org/showthread.php?t=45431)

Cohibaman 03-26-2019 06:58 PM

Ivan,

How do you get stereo from 5.1 or 7.1?

Masterlu 03-26-2019 08:06 PM

Quote:

Originally Posted by Cohibaman (Post 958669)
Ivan,

How do you get stereo from 5.1 or 7.1?

This may surprise some folks, but those that have experienced my Theaters know that I don’t lack for Bass one bit.

I have never used the LFE output on any of my systems. I use top grade WW XLR splitters on my Left and Right channel outputs. One is for the obvious Left/Right primary speakers.

The other leg feeds my stereo subs via XLR Cables. Both of my Theaters have (4) subs / 2 left channels and 2 right channels; in each corner of the room. 2 Gotham V2’s in the rear, 2 Fathom 113V2’s in the front.

This method will also give all your SACD’s a Sub channel feed, where previously there was none. This has been my standard for over 15 years now. ;)

crwilli 03-26-2019 08:13 PM

So what is the recommended connection for 1 sub in a 2 Channel system?

I use one cable from Output 1 on my C1100 left output to the left (mono) input on my Fathom. I can cobble together another balanced cable and connect both left and right Outputs if that is how it is supposed to be connected.

Masterlu 03-26-2019 08:21 PM

Quote:

Originally Posted by crwilli (Post 958687)
So what is the recommended connection for 1 sub in a 2 Channel system?

I use one cable from Output 1 on my C1100 left output to the left (mono) input on my Fathom. I can cobble together another balanced cable and connect both left and right Outputs if that is how it is supposed to be connected.

https://paragonsns2.imgix.net/wp-con...?w=1024&h=1024

Craig... on your C1100 use a pair of XLR’s (L&R) output to feed your Fathom; re-run ARO and season to taste. :beatnik:

Cohibaman 03-26-2019 08:32 PM

Quote:

Originally Posted by Masterlu (Post 958689)
https://paragonsns2.imgix.net/wp-con...?w=1024&h=1024

Craig... on your C1100 use a pair of XLRís (L&R) output to feed your Fathom; re-run ARO and season to taste. :beatnik:



+1

Cohibaman 03-26-2019 08:33 PM

Quote:

Originally Posted by Masterlu (Post 958685)
This may surprise some folks, but those that have experienced my Theaters know that I donít lack for Bass one bit.

I have never used the LFE output on any of my systems. I use top grade WW XLR splitters on my Left and Right channel outputs. One is for the obvious Left/Right primary speakers.

The other leg feeds my stereo subs via XLR Cables. Both of my Theaters have (4) subs / 2 left channels and 2 right channels; in each corner of the room. 2 Gotham V2ís in the rear, 2 Fathom 113V2ís in the front.

This method will also give all your SACDís a Sub channel feed, where previously there was none. This has been my standard for over 15 years now. ;)



Brilliant!

crwilli 03-26-2019 09:52 PM

Quote:

Originally Posted by Masterlu (Post 958689)
https://paragonsns2.imgix.net/wp-con...?w=1024&h=1024

Craig... on your C1100 use a pair of XLRís (L&R) output to feed your Fathom; re-run ARO and season to taste. :beatnik:


I ran a cobbled together second cable(s) from my CR-1 Crossover. It does seem to have filled in the stage for the lower frequencies.

Now I am trying to figure out how I seem to be the only person who never saw or heard anything about connecting two channels to a sub. Hmmm.

Masterlu 03-26-2019 10:10 PM

Quote:

Originally Posted by Cohibaman (Post 958692)
Brilliant!

Thanks :tiphat:

j3brow 03-26-2019 10:22 PM

Quote:

Originally Posted by crwilli (Post 958696)
I ran a cobbled together second cable(s) from my CR-1 Crossover. It does seem to have filled in the stage for the lower frequencies.

Now I am trying to figure out how I seem to be the only person who never saw or heard anything about connecting two channels to a sub. Hmmm.



Lol. I felt the same way when I learned this too. Itís a great feature that McIntosh preamps have a 2nd set of XLR outputs to feed left and right subs or both channels feeding a single sub with the sub summing the signal internally. This way, if the mastering engineer mixed the bass guitar, for instance, completely into the left channel and the drums into the right (like some Beatles tracks are ....) well if you had a sub connected to the right XLR only, your sub would never see Paulís bass notes if mixed in this manner, only your main speakers would see that signal. Bummer, right? Additionally, I know some seasoned listeners are convinced that there is some stereo information buried in low frequencies but that is a story for a different thread.

crwilli 03-27-2019 09:01 AM

I am obsessing over this now. For prosperity to the potentially 1 other person who did not think about this...

All very logical but it seems to depend on where or IF there is a summing of the left and right LF signal. In most home theater systems, the processor with a LFE or Sub output does the summing internally. In that case, you only need one cable to connect to your powered sub.

However, in my case with a stereo ONLY preamplifier and CR1 Crossover, there is no summing done anywhere. Therefore, I need to run cables for both the left and right channels to my JL Audio Sub where the summing of both channels then occurs.

Man do I feel stupid.


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