file T1's and T2's w/parallel LFE - bass gurgle

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T Cobe Posted 5 years 11 months ago
#10764

I'm running the sub connections into the LFE inputs of the Tritons (RCA connection). I have a 'y' adapter connector on each Triton 1 LFE RCA input connector, and connecting the same side's Triton 2's LFE connector. So, for example, the left subwoofer channel is connected to a 'y' splitter for the LFE connection between the front Triton 1 and the surround Triton 2 on the left side. Same for the right.
thanks in advance,
Brad


This sounds like a daisy chain to me going LFE out from receiver into T1s and trying to feed the T2s off of the LFE from the T1s. I may be reading this wrong. I don't think you can go in and out of the LFE in on the T1s. Let us know if I am mistaken or if this was the issue. Good luck, Brad.

Cheers,

T Cobe
Speakers: Triton One L/R, SCXL, Aon 3 Surr/Back, HTR-7000 Height
Pre/Pro/AVR: Anthem AVM 60, Emotiva XSP-1
Amps: Emotiva XPA-5(2), Emotiva XPA-1L (2)
Sources: Oppo BDP-103D, Emotiva ERC-3, PS4, Pioneer PLX-1000 w/Ortofon 2M Bronze
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ArthurDaniels Posted 5 years 11 months ago
#10897

I've had an Emotiva XMC-1 for several months waffling between a 7.2 and 7.1 configuration. I'm generally very happy with it. But when running a 'y'd LFE connenction between T1's and T2's (the 7.2 configuration), there is an intermittent 'gurgle/bump/bump' type of sound on the subs on the left side (happens to have slightly longer cable run, not that I'd think that would make a difference). Sounds similar to someone tapping a microphone in a PA system or maybe light wind noise, but lower in volume).

I've run this by Emotiva and the only response from them so far is they wonder if there is some sort of feedback between the two Triton subs. I figured I post here and see if anyone has experienced anything similar chaining T1 and T2 LFE inputs. It definitely only happens with the parallel LFE connection setup.

The 7.2 configuration:

R/L Goldenear Triton 1's, - (XMC-1) configured as large
C Goldenear Supercenter XL - configured as small, crossover @ 50Hz
Surrounds Goldenear Triton 2's - configured as large
Rear Goldenear Supersat 50 - configured as small, crossover @100Hz
Sub configuration:

I'm running the sub connections into the LFE inputs of the Tritons (RCA connection). I have a 'y' adapter connector on each Triton 1 LFE RCA input connector, and connecting the same side's Triton 2's LFE connector. So, for example, the left subwoofer channel is connected to a 'y' splitter for the LFE connection between the front Triton 1 and the surround Triton 2 on the left side. Same for the right.

I have the XMC-1 subwoofer configuration set to stereo subs. I've also done dual mono, but with the same results.

This really sounds great and makes dialing in the subs very easy.

Debugging experiments (none solve the issue):
* I've swapped cables and speakers and have narrowed it down to the left subwoofer channel of the XMC-1.
* I've swapped cabling using rca-rca connector out of the XMC-1 with XLR-rca calbes out of the XMC-1.
* The gurgle only seems to happen with the 'y' LFE split set up I've described. I don't get the gurgle if only one of the Triton's LFE input is configured (tried both front and surround). It is also only on the left channel.
* Speaker mode preset doesn't matter (tried Dirac and preset 1).
* Input device makes no difference
* I've heard the gurgle when no signal was present on input (e.g. nothing playing on the bluray nor roku box).
* I've tried various decoders too, and for awhile I thought it was Dolby PIIx only, but that was a red herring. It happens on other decoders too.
* Currently trying sub set up to dual-mono rather than stereo, still happens.

thanks in advance,
Brad


Hi Brad,

I'm not familiar with Emotiva equipment. However, I do have a significant amount of experience with complex, multi-speaker, multi-amplifier-AV receiver configurations. My suggestions below are intended to provide a methodical approach to help you isolate the source of your problem.

1. Disconnect all LFE connections.

2. Connect the Emotiva LFE output via a single cable to each Triton speaker and listen for the unwanted sound. Connect only one Triton speaker at a time. If you hear the sound in all of the Triton speakers, then the problem is either in the Emotiva or in the cable. Swap out the LFE cables, one at a time, to see if the sound appears with a specific cable. After testing all cables, connect a Y connector to each Triton speaker in turn, but still connect only one LFE cable at a time - to see if adding the Y connector causes the problem. Swap out Y connectors to check all of them in a like manner.

3. If you do not hear the sound, then connect the Emotiva LFE cable to a single pair of Tritons (either ones or twos) via the same LFE cable and by using one of your RCA Y connectors and a second LFE cable between the two Tritons. If you hear the sound, swap out the Y connector and each of the two LFE cables, one at a time, to see if the sound disappears.

4. If Step 3 produces no unwanted sound, then repeat Step 3, but, instead of connecting a pair of Triton Ones or Twos, connect a Triton One to a Triton Two with the same cables and Y connector. Listen for the sound. If no sound, repeat for the second pair of Tritons. Again, you can swap out cables and Y connectors to see if the problem appears with a particular combination.

5. If still no unwanted sound, re-connect all of your Triton speakers LFE inputs with cables and Y connectors, but use a different AV Receiver or some other LFE source to drive the LFE setup.

You may think of other tests you can run, based upon your configuration and test results.

I have a pair of Triton Ones with their respective LFE inputs connected to separate LFE outputs on my Onkyo 9.2 channel system. I use standard RCA cables, but I am not using a Y connector.

Methodical testing should eventually uncover the source of your problem, unless it is program-material related.

Best,

Art
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