Rca adapter into subs L + R

[Jeff5347]

Well im writing as i was reading a post about it yesterday and cant for the life if me find it. My question is simple. On connecting a subwoofer with a L and R rca and the left say labeled LFE, is the any advantage to taking the rca that goes to the sub and splitting it to a y connector so the input is added to the L and R instead of just LFE.

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[Russdawg1]

No advantage. I did it anyways though lol.

 

[ryanosaur]

There may be increased output (the number I was quoted was 6dB, though I don't recall having to adjust for that after I added the Y adapter), it is supposed to help trigger your Sub if there is a sensitivity issue with Auto-On (this is why I did it, and it does help most of the time), and it doesn't hurt anything. It's been said that with most current Subs and Plate Amps, the signal from the AVR alone should be more than adequate to feed the sub what it needs to perform at spec. *shrugs

 

[William Lemmerhirt]

No. The LFE input bypasses the internal XO/LPF of the subwoofer. This allows you to use bass management in the AVR. In many instances you can use both but all it does is bump the input gain. It doesn’t give you any more output, but if you have auto on issues it can help. If you do have auto on problems, raise the trim in the AVR(but make sure to level match after).
If you do use both,(which I wouldn’t), you have to make sure to turn the subs XO all the way up(probably like 120-150) so you don’t end up with two active xo slopes.

 

[ryanosaur]

Here's the link Lovin' posted when this came up in the What to Do Next thread.

https://www.audioholics.com/subwoofer-setup/basic-subwoofer-setup

 

[William Lemmerhirt]

Here's the link Lovin' posted when this came up in the What to Do Next thread.

https://www.audioholics.com/subwoofer-setup/basic-subwoofer-setup

Didn’t go through the link yet but iirc it’s worth only 3db. Also doesn’t effect maximum output.

Hey Ryan! :wave:

 

[ryanosaur]

No. The LFE input bypasses the internal XO/LPF of the subwoofer. This allows you to use bass management in the AVR. In many instances you can use both but all it does is bump the input gain. It doesn’t give you any more output, but if you have auto on issues it can help. If you do have auto on problems, raise the trim in the AVR(but make sure to level match after).
If you do use both,(which I wouldn’t), you have to make sure to turn the subs XO all the way up(probably like 120-150) so you don’t end up with two active xo slopes.

Indeed, I have my XO disabled on the sub and am only using the AVR.

Like I said myself, I didn't notice any other changes in terms of output, and I don't recall needing to make any additional adjustments after I did it. Just made my Auto-On work more reliably.

I do have my Subs turned down a little for most music I listen too, but that is something between Audyssey and me.

Whatup Bill!?!

 

[Pogre]

From what I read in the other thread I don't think the adapter is going to solve the problem. Did you ever get your subs to play at all?

 

[ryanosaur]

Laughing!
This is hilarious... Mr Kennedy, in the other thread, posted that he didn't know which jack to plug into. I flippantly said he could use both, which is fine and wouldn't hurt anything. This conversation is now spanning TWO threads!

FML.

For the record. My subs are GREAT!

 

[Pogre]

Laughing!
This is hilarious... Mr Kennedy, in the other thread, posted that he didn't know which jack to plug into. I flippantly said he could use both. This conversation is now spanning TWO threads!

FML.

For the record. My subs are GREAT!

See what you started?!

 

[ryanosaur]

Quoth the Pogre:

"It's Alive!!"

 

[Jeff5347]

Laughing!
This is hilarious... Mr Kennedy, in the other thread, posted that he didn't know which jack to plug into. I flippantly said he could use both, which is fine and wouldn't hurt anything. This conversation is now spanning TWO threads!

FML.

For the record. My subs are GREAT!

Ryan , it was more of a hmmm moment when i read it. I had always questioned if it would have any effect then i read that post. I then tried to find it as i couldnt read it all then i forgot where it was. Lol. Your posts make other ppl come up w new questions lol
Yes all my subs play plus i adjusted or played w the xover at the mains and such and was able to lessen the dip. Not all bit a bit less negative spiked



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[ryanosaur]

Ryan , it was more of a hmmm moment when i read it. I had always questioned if it would have any effect then i read that post. I then tried to find it as i couldnt read it all then i forgot where it was. Lol. Your posts make other ppl come up w new questions lol
Yes all my subs play plus i adjusted or played w the xover at the mains and such and was able to lessen the dip. Not all bit a bit less negative spiked



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That particular post was more a response to William and an almost identical conversation I had with another friend because of the other thread. Just good times.

Have you checked the frequency of your suck out againt the wavelength of that frequency? It could be a cancellation due to the subs placement. just speculating, but I did experience that with one of my mains!

 

[Jeff5347]

Ryan. If i remeber correctly it is at 18.93 hz. Say 19 hz i found is 57 feet. Where do i go from there. Se this is the stuff im interested in learning and figuring out

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[ryanosaur]

How big is your room, l x w x h? For me, it happened higher, and my mains were 11' from the back wall; one side had a huge suck out, and when I figured out that the frequency wavelength was 22' it all came together. I moved that one speaker less than 2" and it got back to normal room acoustics.
I'm not certain enough to say whether your scenarop could be fixed the same way, but looking at 1/2 and 1/4 wavelengths may be the answer... likewise frequencies and octave up could trigger that as well, if I understand things correctly.
(I know that I have triggered a room resonance (multiple occasions) by playing an octave above the fundamental resonance of that room... it makes sense to me that the reverse could be true, that a 36-38Hz wave could be interfering with the lower fundamental.) Appologies I can't offer more definitive explanation; I'm still learning this stuff myself! I think its worth looking at, though.

 

[lovinthehd]

As to using the L/R inputs simultaneously for 6dB gain advantage, my understanding is it is not applicable with all amp inputs (I've read 3dB too). The 6dB thing happens with balanced particularly I read in a Rane note that my google-fu is not finding at the moment. I do not understand the phenomena electrically but I eventually hope to

 

[snakeeyes]

It’s a trick to get the sub to auto sense to power on and not power off prematurely. That can be annoying. I did encounter this situation with my HSU VTF2.5 pair and it worked perfect on both. Easy fix.

I haven’t seen this issue on my Rythmik subs.