Output from DMP3 (-10db or +4db)??

  • Thread starter Thread starter HangDawg
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Smokerock is a big hit

I'm going to have it engraved on my crackpipe.
 
Velvet Elvis said:
If you re-cap the shingle it has a great warm sound.... much much more true to the original signal than all that digital crap I'm sure you are using...

So *NOW* who doesn't know what they're talking about??

You, because there are no caps on shingles. pppptttttt ! ! !


BTW - those are THE Behringer mics. I had to use electric tape to keep them in the mic thingies. :D I though it would be amuzing to take a picture of me with an ovation and like 12 mics surrounding me with no particular rhyme or reason. :) Thought it might impress the locals. I saw it in an issue of Recording mag, once.
 
Yeah... well.... my dad can beat your's up!

So there!

Velvis

(ahhh... only 756 more posts until I crack the 1k mark!)
 
This is a great thread.

Pass that pipe over this way, Smoke. As if any of us needs it.
 
I wonder if we are the fastest growing thread on the bbs yet?

Hmmmm.... let's see... what other non-rack comments can we lurch into....

BTW Chess... your picture would have been more impressive if you would have had a pair of MXL603's or Oktava's BEHIND you, so that you could claim you mix in 5.1 surround :)

I'm sure the customers just ate it up too right?

Velvet
 
Actually, I was going to use this one. But somehow I figured singing in front of a rock might scare some of the higher-end customers away.
 

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Huh?

Here I was just about to agree with Chessrock, and he changed his position.

First -- for the original question, I think the VMP3 output can be connected to something that wants either a -10 or a +4 input (yes, it could be connected to a -10 balanced or unbalanced input or a +4 unbalanced or balanced, if that's what you happen to have). Just adjust the gain and look at the meters on the thing you're connecting it to.

The only limitatation is the amount of gain. The maximum gain is 66dB, so if the signal produced by your mic is less than -62 dBu (.0006 volts), you won't have enough gain to produce a +4 balanced signal. When you connect the VMP3 output to an unbalanced input, you lose about 6 dB (i.e. half the voltage, since you're grounding one leg of the balanced connection), so you'd need a mic signal that's at least -56 dBu (.0012 volts) to produce a +4 unbalanced signal.

According to the manual, the maximum output is +22 dBu (balanced) or +16 dBu (unbalanced), so that's not a practical limitation.

It doesn't "automatically" switch from a nominal +4 to a nominal -10 output when you plug a TS plug into it. It just loses 6 dB (half) of the signal. The difference between +4 dBu and -10 dBV is 11.79 dB (a factor of almost 4).

Second -- on the side issue, which the original poster didn't actually ask about -- when you do have a choice between a +4 or a -10 output (which you sometimes do, particularly when dealing with something that doesn't have a pot to vary gain or to trim the output level): I would have thought the correct approach would be to use -10 when you're plugging the output into something that expects a -10 input, and +4 when plugging into something that expects a +4 input.

Sor far as I cant tell, there shouldn't be any significant difference in the amount of ambient room noise. Say you've put the mic in a room with a singer who's making a 70 dB SPL racket right next to the mic, while there's also a refrigerator making a 45 dB SPL noise (measured at the mic). There's going to a 25 dB signal-to-noise ratio between them, no matter what you do -- at least so long as you don't compress or expand (or gate) the signal (compressing will generally make the signal-to-noise ratio lower, and expanding will make it higher).

If you adjust gain on the VMP3 to produce a signal that peaks at +4 dBu, the ambient noise will be at -21 dBu (.07 volts, if anybody's counting). If you adjust gain on the VMP3 to produce a signal that peaks at -10 dBV, the ambient noise will be at -35 dBV (.018 volts). In the end, on tape or disk or a playing over a speaker, it'll all come out the same.

Caveat: it's possible that the VMP3 compresses the signal somewhat at very high gain settings. I don't know that it does, and it really shouldn't, as long as you're within it's rated limits, but it might. Another caveat: if you crank the gain to produce a +4 signal, you will get more electronic noise from the preamp itself.
 
Johnston...

We already established most of that... and have somehow managed to move this thread into the netherregions of postings...

Chess.... I can't get your attachment to load.

Velvet
 
Aw, man.

Why did you have to kill my buzz by talking about something relevant to the rack forum, SJ?

Velvet, it's just a picture of some dude playing guitar and singing to a hanging rock (it's supposed to be a binaural deal, but it looks silly :D)
 
Nether regions

Before the nether regions part, I thought someone was actually buying that "automatic" switching rationalization (and maybe even the "ambient noise" musings).
 
Chess...

I ought to try that with some of my clients... Just let them sing into a rock. I'd bet the end result would sound better :)

You know the type of client... send them off to the vocal booth... set the autotune to max... press record... turn the control room monitors off... take a little nap while they sing their rendition of Wind Beneath My Wings.... reggae style :)

And then have the producer tell you it was the best performance EVER :)

Velvet
 
SJ...

Someone here posted that the manual states that it switched between -10 and +4 based on the cable (which a switching jack would certainly be capable of)... but other than that, they ambient noise things was never a go :)

Velvet
 
Velvet Elvis said:
take a little nap while they sing their rendition of Wind Beneath My Wings.... reggae style :)

Shhh. Don't give the guys in the mp3 clinic any ideas.
 
oh man... you're right...

Hey... did I ever tell you you're my hero? Everything I wish that I could be?

bwahahahahahahahahaahah

I once thought there was wind beneath my wings... turned out to be gas.


Velvet
 
I might seem crazy but making something more sensitive has an effect on noise that can exist like an Air conditioner for example. Yo may not hear it yourself, you may not have it on your track at -10 but at +4 Its more likely to get there.

Ambiant noise is noise not room treatments, I dont Know what gave you the Idea that room treatments have anything to do with noise.heck I have pads on my pre that will cut 20db.
 
Darrin,

Whether you realize it or not, SJJ answered your point. Of course, some of us immediately go into a coma as soon as a formula or some math is introduced into an argument, so let me reiterate:

Yes, you are right. The ambient noise does go up when you change -10 to +4. But so does the rest of the signal. The point is, as SJJ said, the RATIO of signal to noise stays exactly the same.

So before the music starts, you suddenly hear your furnace or refrigerator way louder than it was at (-10). Except that then the music comes in BLASTING the shit out of your speakers and ears, until you scramble over and turn down your master volume. Now, after wiping away the blood from your eardrums, go back and start the track again with the volume remaining in it's turned down position. Wonder of wonders, now your home appliances aren't any more intrusive than when you listened to them at -10! This is because the S/N ratio doesn't change.

See, that wasn't so hard! Sorry about your eardrums - with any luck the damage won't be permanent!
 
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