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[Uniz Kazz]

Do any of you send a mono signal to subs if they are in LR physical configuration? Reasons to do it or why not to? Thanks


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[Bob Leonard]

The output from the board is generally L/R, or in some cases L/C/R. However, that does not indicate that the system is set up in a "stereo" configuration, and the sound from L/R will be equal and the same in content unless panned. A mono signal sent L/R is the correct method for deploying subs in all but special cases.

[William Schnake]

Do any of you send a mono signal to subs if they are in LR physical configuration? Reasons to do it or why not to? Thanks


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I may be misunderstanding your question, but this is what we do.  We run stereo L/R with instruments and vocals paned appropriately in the stereo field.  We then run our sub as a mono sub off of one of the mixer 'Aux Out' channels.  The reason we do this is that by not putting any vocal channel in the subs it cleans up the vocals and it allows the sub to only process low end signals such ass bass guitar and kick drum.  Our systems are crossed over between tops and sub at roughly 98 Hz.

If I missed the question I apologize.

Bill

[Uniz Kazz]

I may be misunderstanding your question, but this is what we do.  We run stereo L/R with instruments and vocals paned appropriately in the stereo field.  We then run our sub as a mono sub off of one of the mixer 'Aux Out' channels.  The reason we do this is that by not putting any vocal channel in the subs it cleans up the vocals and it allows the sub to only process low end signals such ass bass guitar and kick drum.  Our systems are crossed over between tops and sub at roughly 98 Hz.

If I missed the question I apologize.

Bill

Hi Bill,

Thanks for the reply. Yes I do the same, sorry for not being specific enough. My question is regarding if you would do the same for a dj setup with dance music. Would you still benefit from running aux fed subs (sending the mixed LR signal) to the subs, rather than having the subs on the left side get the left signal and right side subs getting the right signal. Taking into account the benefit of running aux fed subs for more control. Thanks


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[Stu McDoniel]

Hi Bill,

Thanks for the reply. Yes I do the same, sorry for not being specific enough. My question is regarding if you would do the same for a dj setup with dance music. Would you still benefit from running aux fed subs (sending the mixed LR signal) to the subs, rather than having the subs on the left side get the left signal and right side subs getting the right signal. Taking into account the benefit of running aux fed subs for more control. Thanks


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If you think about the fact that people use a single mono sub all the time in their homes for music and movie content then that pretty much answers your question?

[Jerome Malsack]

But the advantage if the Aux fed sub is you only sending the 2 or three mics to the subs.  With pre recorded segments your not getting the same isolation. 
What you do get is a way to make the subs put out a stronger signal with a quitter mids and tops to get you closer to the Munsie curve. 

on the home stereo they provided a loudness control that bosted the bass and some treble to allow you to enjoy the music at lower levels and still have a pleasant sound to enjoy. 

this works well for the weddings because people want to talk and catch up with family members and yet party.   

[Helge A Bentsen]

If you pan instruments with low frequency content, the subs should be stereo.

I find it very confusing if I pan a instrument and hear the high frequencies from one side of the PA but the low frequencies from both sides.

[Alec Spence]

I find it very confusing if I pan a instrument and hear the high frequencies from one side of the PA but the low frequencies from both sides.

You really hear that...?

[duane massey]

Depends. Are you playing music with an important stereo image? And, YES, I can hear L/R bass on recordings that actually have the bass, etc, actively panned L/R.
One size does not fit all.

[Helge A Bentsen]

You really hear that...?

Yes.

[Caleb Dueck]

Depends. Are you playing music with an important stereo image? And, YES, I can hear L/R bass on recordings that actually have the bass, etc, actively panned L/R.
One size does not fit all.

The primary benefit of aux fed subs is to keep LF rumble from most input sources from reaching the subwoofers.  If no LF rumble, then no real need for aux fed subs. 

I guess you could use a stereo aux or stereo subgroup for the subs, if you need panning and routing control. 

2 questions - are there any sources with stereo LF?  Are the subs in a stereo, or at least split, configuration? 

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[Tim McCulloch]

You really hear that...?

Depends on the instrument and if the fundamentals are in the subwoofer pass band, and you can localized it much more strongly outdoors or in very large spaces where the first reflections are several wavelengths out.

So yes.

And no.  Indoors with lots of reflections and LF contribution from stage SPL, probably not so perceivable.

[Tim McCulloch]

Hi Bill,

Thanks for the reply. Yes I do the same, sorry for not being specific enough. My question is regarding if you would do the same for a dj setup with dance music. Would you still benefit from running aux fed subs (sending the mixed LR signal) to the subs, rather than having the subs on the left side get the left signal and right side subs getting the right signal. Taking into account the benefit of running aux fed subs for more control. Thanks


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Hi Uniz-

I'm glad we got the "good DJ guys" on our forums at PSW. 

When I provide systems for dance gigs I run the subs in stereo from either a pair of Aux sends or a stereo Aux if my PA mixer du jour has them.  I have had shows with program material that was essentially mono down in the sub woofer pass band but things that panned were probably around the 60-80Hz range on the low end...  but I've had DJs with program material that panned everything hard "ping pong" including the subwoofer-range material.  I'm not sure the punters would notice if the subs were mono but the talent probably would.

As it is, with aux-fed subs I set the top/sub balance with the promoter or headline talent if talent is available for sound check and unless things get carried away, generally leave them alone.  I could loop out of the PA racks into the sub racks and set the tonal balance with DSP... 2 less cables to strike at the end.

[Geert Friedhof]

Never been a fan of aux sent subs... You always have a high-pass. At least one used to have.

I'm with Helge on this one. Especially with todays line arrays, who cross at 60-70Hz, so what's the point...

[Steve M Smith]

I have powered subs with a crossover.  I normally run left and right into one sub and send the left and right through outputs to the second sub so both subs get both left and right.  Then take the right high pass output from one and the left high pass output from the other.


Steve.

[Keith Broughton]

Never been a fan of aux sent subs... You always have a high-pass. At least one used to have.

I'm with Helge on this one. Especially with todays line arrays, who cross at 60-70Hz, so what's the point...

I have tried both and even with high pass on a vocal, I get less "thump" with plosives in an aux fed sub setup.
These days, subs seem to be run much hotter than necessary and keeping vocals (even high passed) out is handy.
Also, there are many line arrays, and other speaker configurations, that are not crossed at 60-70 Hz.

[Steve M Smith]

Whilst on the subject of subs, I have another question which some people might have differing opinions on...

I occasionally use just one sub. It is placed to one side with a speaker on top and another speaker on a stand is at the other side.

I have always put the high passed signal to both top speakers, however, I sometimes wonder if I should give the speaker on a stand the full range signal.

Any thoughts?


Steve.

[Uniz Kazz]

Whilst on the subject of subs, I have another question which some people might have differing opinions on...

I occasionally use just one sub. It is placed to one side with a speaker on top and another speaker on a stand is at the other side.

I have always put the high passed signal to both top speakers, however, I sometimes wonder if I should give the speaker on a stand the full range signal.

Any thoughts?


Steve.

I wouldn’t as you’d want the tops to level with each other also to be able to push the tops as far as they can go


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[Steve M Smith]

I wouldn’t as you’d want the tops to level with each other also to be able to push the tops as far as they can go

This is usually at small venues with folk/acoustic acts.  Pushing as far as they will go doesn't happen.


Steve.

[Tim McCulloch]

Whilst on the subject of subs, I have another question which some people might have differing opinions on...

I occasionally use just one sub. It is placed to one side with a speaker on top and another speaker on a stand is at the other side.

I have always put the high passed signal to both top speakers, however, I sometimes wonder if I should give the speaker on a stand the full range signal.

Any thoughts?


Steve.

I'd be inclined to keep the HPF on both tops.

This is something relatively simple to experiment with using pink noise.  Maybe you can give it a go and let us know of your impressions.

[Steve Garris]

Whilst on the subject of subs, I have another question which some people might have differing opinions on...

I occasionally use just one sub. It is placed to one side with a speaker on top and another speaker on a stand is at the other side.

I have always put the high passed signal to both top speakers, however, I sometimes wonder if I should give the speaker on a stand the full range signal.

Any thoughts?


Steve.

I experimented with this last summer at an outdoor event. We had the subs clustered on one side, with a 2-way mains, one on the sub side and one on a tripod. The mains were a good 30 ft apart or more. It sounded better when we ran the tripod-mounted main full-range. YMMV

[John Chiara]

If you pan instruments with low frequency content, the subs should be stereo.

I find it very confusing if I pan a instrument and hear the high frequencies from one side of the PA but the low frequencies from both sides.

I see no benefit for frequencies that I feel to pan...and...If they do...they lose impact by having less speakers produce by the lows. I like to Ian tons and hear the attack in a L/R sound field...and not lose the weight.

[ProSoundWeb Community]