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Digital Audio Principles

Preamp demo


From:

Digital Audio Principles

with Dave Schroeder

Video: Preamp demo

Okay, so let's take a tour of a stand-alone pre-amplifier. Here we have a two channel tube pre-amplifier. It's got lots of options, there're some knobs and adjustments. Let's start with the back and look at the inputs and the outputs. So first, we have the inputs. These are combo jacks that will accept either a microphone cable, an XLR cable, or a quarter inch jack into the center there. These are cool designs that save a lot of space and interfaces. You'll find them on a lot of preamps now, and a lot of audio interfaces that connect your computer.
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  1. 50s
    1. Welcome
      50s
  2. 39m 10s
    1. What is sound?
      4m 15s
    2. Hertz and frequency response
      5m 34s
    3. Phase
      2m 39s
    4. Capturing audio
      3m 39s
    5. Sample rate
      6m 16s
    6. Bit depth
      9m 47s
    7. The waveform
      5m 3s
    8. Audio file formats
      1m 57s
  3. 7m 25s
    1. What is a digital audio workstation?
      2m 59s
    2. Typical DAW signal flow
      4m 26s
  4. 50m 33s
    1. What microphones do
      1m 57s
    2. Element types
      5m 0s
    3. Pickup patterns
      6m 51s
    4. Axis
      2m 52s
    5. Frequency response and the proximity effect
      5m 10s
    6. Phase issues
      1m 41s
    7. Microphone types
      8m 44s
    8. Miking vocals
      5m 39s
    9. Miking amplifiers
      2m 17s
    10. Miking drums
      10m 22s
  5. 16m 39s
    1. Cables and connectors overview
      2m 42s
    2. Balanced and unbalanced cables
      3m 19s
    3. Common cable types
      7m 13s
    4. Cable tips
      3m 25s
  6. 12m 16s
    1. What is an I/O device?
      1m 41s
    2. Analog to digital conversion
      3m 10s
    3. Tour of an audio interface
      4m 49s
    4. Interface considerations
      2m 36s
  7. 21m 5s
    1. What is a preamp?
      3m 21s
    2. Input levels
      5m 29s
    3. Padding
      2m 18s
    4. Phantom power
      2m 37s
    5. Phase reverse
      3m 4s
    6. Preamp demo
      4m 16s
  8. 12m 56s
    1. What is a mixer?
      5m 55s
    2. Input section
      1m 17s
    3. Channel strips
      3m 16s
    4. Master section
      2m 28s
  9. 18m 21s
    1. What is monitoring?
      2m 11s
    2. Speakers
      4m 47s
    3. Room considerations
      5m 43s
    4. Headphone types
      3m 50s
    5. Monitoring levels
      1m 50s
  10. 15m 23s
    1. What role do computers play?
      1m 36s
    2. Performance issues
      4m 11s
    3. Hard drives
      4m 38s
    4. Mechanical noise
      2m 10s
    5. Authorization
      2m 48s
  11. 6m 54s
    1. Planning for recording
      54s
    2. Doing a system check
      1m 26s
    3. Planning your inputs
      1m 42s
    4. The recording environment
      2m 52s
  12. 25m 52s
    1. Types of digital audio software
      38s
    2. Multi-track recorders/sequencers
      4m 56s
    3. Two-track recorders/waveform editors
      4m 55s
    4. Loop-based music production software
      5m 44s
    5. Plug-ins
      6m 56s
    6. Other varieties
      2m 43s
  13. 18m 59s
    1. Common components
      46s
    2. The transport
      2m 4s
    3. The toolbar
      3m 19s
    4. The Edit/Arrange window
      4m 42s
    5. The mixer
      5m 8s
    6. The file list
      3m 0s
  14. 19m 17s
    1. Setting up a session
      3m 30s
    2. Assigning inputs and getting signals
      3m 19s
    3. Input modes
      3m 28s
    4. Overdubbing and punching
      5m 14s
    5. Bouncing down
      3m 46s
  15. 19m 42s
    1. What is editing?
      1m 21s
    2. Waveforms
      2m 53s
    3. Making silent cuts and trims
      7m 1s
    4. Fades and automation
      8m 27s
  16. 1h 23m
    1. What are plug-ins?
      3m 0s
    2. Using plug-ins
      6m 11s
    3. EQs
      7m 4s
    4. Dynamics pt. 1: Compressors, limiters, expanders, and gates
      5m 40s
    5. Dynamics pt 2: Applying dynamic effects
      7m 2s
    6. Pitch shifting
      6m 14s
    7. Reverb
      9m 28s
    8. Echo and delay
      6m 23s
    9. Modulation effects: Phaser, flanger, and chorus
      9m 39s
    10. Sound tools pt. 1: About, gain, normalize
      7m 39s
    11. Sound tools pt. 2: Reverse and time compression/expansion
      6m 29s
    12. Sound tools pt. 3: Noise reducers, dither
      8m 11s
  17. 23m 43s
    1. What is MIDI?
      3m 6s
    2. Keyboard controllers
      1m 23s
    3. Computer-based virtual instruments
      1m 6s
    4. Control surfaces
      1m 6s
    5. Recording and editing MIDI
      12m 4s
    6. Virtual instruments
      4m 58s
  18. 27m 29s
    1. What is mixing?
      1m 54s
    2. Some common objectives
      3m 4s
    3. Some useful techniques
      5m 59s
    4. A quick mixing demo
      16m 32s
  19. 18m 48s
    1. What is mastering?
      2m 24s
    2. Sonic maximization
      9m 43s
    3. Final preparations and exporting
      6m 41s
  20. 13m 34s
    1. What is audio compression?
      2m 16s
    2. Popular formats
      2m 9s
    3. Bit rate, sample rate, and channels
      5m 42s
    4. Other adjustments and considerations
      3m 27s
  21. 15m 6s
    1. Essential gear
      7m 36s
    2. Voice recording setups
      1m 43s
    3. The voice production process
      5m 47s
  22. 10m 4s
    1. Analog vs. digital
      2m 48s
    2. Tube vs. solid state
      5m 6s
    3. The continual upgrade
      2m 10s
  23. 18s
    1. Goodbye
      18s

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Digital Audio Principles
7h 57m Appropriate for all Mar 02, 2007

Viewers: in countries Watching now:

Whether one is producing music, podcasts, game sounds, or film sound effects, Digital Audio Principles provides the tips and techniques that will make the project a success. Author Dave Schroeder explains the basics of digital audio production techniques and covers the essential hardware and software. He also discusses sound theory, frequency response, the range of human hearing, and dynamic range.

Subjects:
Audio + Music Audio Foundations Acoustics Microphones
Author:
Dave Schroeder

Preamp demo

Okay, so let's take a tour of a stand-alone pre-amplifier. Here we have a two channel tube pre-amplifier. It's got lots of options, there're some knobs and adjustments. Let's start with the back and look at the inputs and the outputs. So first, we have the inputs. These are combo jacks that will accept either a microphone cable, an XLR cable, or a quarter inch jack into the center there. These are cool designs that save a lot of space and interfaces. You'll find them on a lot of preamps now, and a lot of audio interfaces that connect your computer.

So I'm actually going to connect my iPod here into Input number 2, which normally wouldn't be connecting to a preamp, you'll be connecting a microphone or something else that needs boosting. Most often a microphone, but for this lesson we're going to show that. Now we've got the outputs, channel outputs, these two will go for channel 2, these go for channel 1. Balanced output and an unbalanced output, and we can select based on how we want to work, which ones to use. I'm going to take a balanced output of channel 2 and feed this into our recorder.

So now let's look at what we have on the front. I'll just go along the buttons. Each channel is the same. It's just the same thing two times. I'm going to start over here. We have the 48 volt phantom power button, which as we mentioned is what condenser microphones generally need. By pushing this in, it feeds 48 volts out through the microphone, input on the back, to your condenser microphone. If you're using a condenser, think it's all working, but you're not getting you sound. Try the 48V button with the phantom power. Next we've the phase button, which is designated by this little circle with those slash through it.

By pushing that in, it will change the signal coming through this channel only 180 degrees out of phase. This is helpful if you're having phasing issues with the way your microphones are set up. Also there's a pad. On this I think it's about 10DB. By pushing that button in and out, these are cool, because they are light up, by the way. By pushing that button in and out, you'll reduce the signal completely by about 10DB no matter what. By pushing that it cuts the pickup of 80Hz frequencies.

Then we have a gain knob, which is the preamp adjustment. So as we're sending signal, we can turn this up, which I'll send a little bit right now which I'll start to hear here. There we go, so now we have a single, we can see in our meter. We can use this gain knob basically to increase the input level of our input so that we can get a good signal to the recorder. Now this is an analog meter, that's not digital, so zero DB is where it kind of goes from Black to Red.

With analog it's okay to go pass that zero point and really you just want to trust your ears. Obviously, it's really spiking over there. That's a little too much as it just gets pegged against the wall like that. Sorry if that's distorted. Anyway, right around there you can go above and below, and actually a little bit of Red is good. With analog the trick is to really trust your ears. If it sounds good, it is good. Also on this, because it's a 2 pre-amplifier, we have an option of how much of the two we want to use when it's turned all the way off. I'm not using any of the two, but I can turn that up, and that basically sends the signal through an audio tube, which is this little fellow.

Which is a device that people claim really warms up the sound of an audio signal. So I can use as much of that as I want. So we're done with the song. But if I crank that all the way up, I can actually get distortion on it. We'll see if we can--if it actually distorts, it might not. So you can use it for a distortion effect on vocals, but really you just use a little bit to kind of warm things up. And we'll talk a little bit about the analog and tube and digital and all that stuff in a different section, but anyway that's the general principle and the general set of features that we're going to have when you are dealing with the stand-alone preamp.

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