BFM system firt start help ..

The hows and whys of running sound.
Message
Author
Bruce Weldy
Posts: 8539
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: BFM system firt start help ..

#16 Post by Bruce Weldy »

BrentEvans wrote:
Bruce Weldy wrote: Well, it will be easy enough to test. Next time I set up, I'll pop the L or R and see what happens. I expect volume to go down.
It's not just about volume. It's about interaction. Some L/R sources are slightly out of phase which can result in certain amounts of frequency-specific cancellation. A better test would be to compare the y-cabled signal to two separate mono channels to stereo split, and listen for the differences. I've found that two separate channels sounds better than a Y cable, and of course true stereo sounds best from a true stereo source.
No question, that's the case. I run mono however, so I'd be sending the same info to both - so I don't think I'd have any phase isuues (all channels are centered). Like the OP, I'm running the tops on one channel. With no mono out available, I run the L/R together in order to not lose signal should a channel get panned away from the "chosen" output. I could pan everything to L and use the left output only....I don't see what I'd gain by doing that.

I did read the Rane article, but while I'm probably hardheaded, I'm open to facts (hey, I built these goofy horn boxes and quit splitting my subs, didn't I?). But that article didn't contain anything concrete (pertaining to my situation) that would tell me why I'm wrong - it just looked like an rant/opinion piece to me.

Seis Tres,
There are some things in sound that are absolutes....and some are open to preference. Facts can move items from one side to the other - public opinion doesn't. I'm always open to learning new things. Teach me - don't lecture me.


This horse has been thoroughly beaten.....time to let him die in peace.... :horse:

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

el_ingeniero
Posts: 931
Joined: Sun Jul 18, 2010 11:46 pm
Location: Minneapolis, MN

Re: BFM system firt start help ..

#17 Post by el_ingeniero »

Bruce Weldy wrote: I did read the Rane article, but while I'm probably hardheaded, I'm open to facts (hey, I built these goofy horn boxes and quit splitting my subs, didn't I?). But that article didn't contain anything concrete (pertaining to my situation) that would tell me why I'm wrong - it just looked like an rant/opinion piece to me.
If it's been working for you, then you've been really lucky up to now. The first time I tried combining unbalanced stereo inputs from a computer sound card into a single channel of a mixer using a Y-cable, I got clipping and massive distortion. I never tried that again. The quote below from the Rane article tells me why:
Here is the rule: Outputs are low impedance and must only be connected to high impedance inputs -- never, never tie two outputs directly together -- never. If you do, then each output tries to drive the very low impedance of the other, forcing both outputs into current-limit and possible damage.
If you really need to run mono, then I bet the DCX 9624 will do the stereo to mono part for you no problem.

Bruce Weldy
Posts: 8539
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: BFM system firt start help ..

#18 Post by Bruce Weldy »

This horse has been thoroughly beaten.....time to let him die in peace.... again....:horse:

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

CafSentryGnome
Posts: 258
Joined: Tue Sep 15, 2009 10:03 am
Location: South Australia

Re: BFM system firt start help ..

#19 Post by CafSentryGnome »

taken from the Behringer website:
Additional Sum signal derived from the A/B/C inputs offers a fourth internal input signal

Post Reply