seeking advice from experienced mobile DJs and sound engineers

**SirReal** · 02-24-2016, 06:43 PM

I would try sending the left channel to one sub and it's monitor and the right channel to the other sub and it's monitor. ALso please post the make and model of your subs, please.

**soundinmotiondj** · 02-24-2016, 06:46 PM

Originally Posted by Synaptic Flow

Now could you explain what you mean by "reverse the conductors?"

This has a reasonable write up with some pictures.

https://www.mtx.com/library-phase-discussion

If you have an amplifier that uses "binding posts" you can wire the subwoofers one way, and then switch one of them. "Banana plug" connectors are handy.

**Synaptic Flow** · 02-24-2016, 06:50 PM

Originally Posted by SirReal

I would try sending the left channel to one sub and it's monitor and the right channel to the other sub and it's monitor.

Hello.

I have done that method with very little difference. The manufacturer of this sub actually tells you to use both L/R the way I have it to increase performance. And of course when I ran a single sub, I ran L/R instead of just one channel.

**soundinmotiondj** · 02-24-2016, 06:54 PM

Originally Posted by Synaptic Flow

Hello.

I have done that method with very little difference. The manufacturer of this sub actually tells you to use both L/R the way I have it to increase performance. And of course when I ran a single sub, I ran L/R instead of just one channel.

Regardless of other stereo content, the <100Hz content tends to be mono and the same on both channels.

**SirReal** · 02-24-2016, 07:17 PM

Definitely sounding like one is out of phase. Have you tried setting up your system outside? Another possibility is standing room nodes, how big was the space you set these up in?

**Synaptic Flow** · 02-24-2016, 07:27 PM

Originally Posted by SirReal

Definitely sounding like one is out of phase. Have you tried setting up your system outside? Another possibility is standing room nodes, how big was the space you set these up in?

I've never tried it outside. The room I was in this past weekend was a small hotel meeting room. There were enough long tables and chairs in there to seat maybe 60 people with standing room for many more around the boundaries. (maybe 100) All of that was removed.

My gig, a few weeks prior was in a room maybe 20 ft wide and 40 ft long, with VERY high ceilings (probably 30 ft) possibly a bit much for my minimal gear.

Now since I am using all powered gear, I have no wiring to switch to change phase to check for a problem. All I have is my signal input cables. I guess I could open both subs and see if they are wired the same internally?
Hopefully they are not soldered connections or I will have to outsource help to fix that.

**SirReal** · 02-24-2016, 07:35 PM

Are both your TRS to XLR cables that you're using from the same company? If you have a voltage meter you can easily check the phase of the cables. Also, please post the make and model of your subs.

**Synaptic Flow** · 02-24-2016, 09:47 PM

Originally Posted by SirReal

Are both your TRS to XLR cables that you're using from the same company? If you have a voltage meter you can easily check the phase of the cables. Also, please post the make and model of your subs.

I use 2 TRS to TRS and 4 XLR to XLR. They are all the from the same company and have only been used a few times. I don't have the voltage meter, but I will get one.

Now I will post my subs and hold my head down in shame for a scolding.
Seismic Audio - Aftershock 18" x 2

http://www.seismicaudiospeakers.com/.../Aftershock-18

Crazy thing about it is that my audiences think it sounds great, but my brother and I can tell what's lacking. Then again I have friends who can't tell when an mp3 sounds bad.