Recording - January 2013 - 47

request a custom headphone mix, auxiliary mix outputs are the usual source. Most of today’s pro audio gear interfaces at the nominal +4 dBu operating level, though the output level of a computer’s built-in sound card is often lower. Most headphone amplifiers have sufficient gain to accommodate consumer sources, though the drummer may not be happy with his headphone volume when the reference track comes directly from a portable music player. Stereo or mono headphone mix? That seems obvious—stereo, of course, since you have two ears and two earphones—but a mono headphone mix for studio tracking was the standard studio setup for 30+ years. A stereo distribution amplifier will provide everyone with the same mix. However, you may not have enough outputs available to feed everyone in stereo when only independent mixes will keep everyone happy. This is a hardware limitation that you must consider when planning your studio or stage setup. Few small-format analog mixers offer stereo auxiliary buses, though you can cobble up a stereo headphone mix using two (mono) auxiliary sends for left and right ‘phones. By sending a channel to two buses, you can adjust the panning by juggling the left and right bus send levels—possible but not convenient. On the other hand, today’s digital consoles are a different story. Since their internal signal routing and control functions are derived through software, the ability to link a pair of buses for stereo operation is a fairly common feature. As one possible example, with Aux 1 and 2 buses “linked,” for a given channel on one particular digital mixer, the Aux 1 Send control becomes the stereo auxiliary mix level while the Aux 2 Send knob pans the channel signal between Aux Outputs 1 and 2. Count your chickens before you hatch a new headphone system! A mixer with six auxiliary buses, when linked in pairs, will give you only three stereo headphone feeds. A previously adequate mixer may become instantly obsolete when band members show up with their own headphones and want their own mixes. And don’t forget to count outboard signal processors—they usually get their inputs from auxiliary sends. DAWs are usually capable of creating as many stereo or mono mixes as you want, but how many you can use for monitor outputs is limited by the number of independent hardware outputs your interface has. An 8-output interface will allow you to have four independent stereo mixes (of which one might be for the control room), but an interface with only one stereo output means everyone must share one mix. Know, too, how your interface counts its outputs, particularly if you’re still in the shopping phase. The marketing pictures may show separate headphone, control room, and auxiliary line output jacks, perhaps with individual volume controls, but if they’re all fed from the same D/A converter they’ll all carry the same mix. Let’s have a look at some representative types of headphone amplifiers and how they might best be used. This isn’t a review or recommendation, but the models mentioned here are representative of the various configurations you might encounter in a search to meet your needs. The headphone distribution amplifier The Aphex HeadPod 4 (see Figure 2) is a typical headphone distribution amplifier; we reviewed its predecessor, the HeadPod 454, in our December 2009 issue. It splits a single stereo input out to four separate amplifiers, each with its own volume control and headphone jack. There’s a master level control ahead of the split for trimming. In addition to being quite a high-hidelity amplifier, it has flexible input connections, minimizing the need for special cables or adapters. There’s a pair of mono left and right line-level input jacks typically fed from line-level inputs, a single stereo input jack typically fed from the headphone jack on a mixer or sound card, and to top it off, a digital S/PDIF input with an internal A/D converter. You can use only one set of inputs at a time (there’s a switch) and although everyone hears the same mix, everyone can control his own headphone volume. Since acoustic musicians generally are comfortable playing to a well-balanced mix, this type of headphone amplifier would be a good choice if that’s your style of music. Of course when it comes to overdubbing individual players, you can

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Some History Headphones are really old. Early radios had no loudspeakers, only terminals to connect headphones. Broadcasters from the 1930s worked with headphones but ‘phones didn’t really take a role in music recording until Les Paul started overdubbing in the late 1940s. They became a necessary evil in studios of the 1970s that were built so dead that you couldn’t hear other players more than a couple of feet away, and now they’re expected as a matter of course to help musicians play better.
RECORDING January 2013

47



Table of Contents for the Digital Edition of Recording - January 2013

Recording - January 2013
Fade In.
Table of Contents
Talkback.
2012 AES Convention Report.
Universal Audio Apollo.
ADAM Audio F5 and F7 Monitors.
Earthworks ZDT 1022 Mic Preamp.
Trident HG3 Close Field Monitoring System.
AKG K702 65th Anniversary Edition Headphones.
Grace Design m903 Reference Headphone Amplifier.
Monitors & Monitoring.
Lauten Atlantis FC-387 Condenser Microphone.
Recording Fundamentals. Chapter 13: Monitors Part 2.
PreSonus BlueTube DP V2.
Getting Into Your Head.
Shure SE215 Sound Isolating Earphones.
Readers’ Tapes.
iOS Music Tools: Last-Minute Audio Gifts!
Sennheiser HD800 Headphones.
Advertiser Index.
2012 Annual Index.
Fade Out.
Recording - January 2013 - Recording - January 2013
Recording - January 2013 - Cover2
Recording - January 2013 - 1
Recording - January 2013 - 2
Recording - January 2013 - 3
Recording - January 2013 - Fade In.
Recording - January 2013 - 5
Recording - January 2013 - Table of Contents
Recording - January 2013 - 7
Recording - January 2013 - Talkback.
Recording - January 2013 - 9
Recording - January 2013 - 2012 AES Convention Report.
Recording - January 2013 - 11
Recording - January 2013 - 12
Recording - January 2013 - 13
Recording - January 2013 - 14
Recording - January 2013 - 15
Recording - January 2013 - 16
Recording - January 2013 - 17
Recording - January 2013 - 18
Recording - January 2013 - 19
Recording - January 2013 - Universal Audio Apollo.
Recording - January 2013 - 21
Recording - January 2013 - 22
Recording - January 2013 - 23
Recording - January 2013 - ADAM Audio F5 and F7 Monitors.
Recording - January 2013 - 25
Recording - January 2013 - Earthworks ZDT 1022 Mic Preamp.
Recording - January 2013 - 27
Recording - January 2013 - Trident HG3 Close Field Monitoring System.
Recording - January 2013 - 29
Recording - January 2013 - AKG K702 65th Anniversary Edition Headphones.
Recording - January 2013 - 31
Recording - January 2013 - 32
Recording - January 2013 - 33
Recording - January 2013 - Grace Design m903 Reference Headphone Amplifier.
Recording - January 2013 - 35
Recording - January 2013 - Monitors & Monitoring.
Recording - January 2013 - 37
Recording - January 2013 - 38
Recording - January 2013 - 39
Recording - January 2013 - Lauten Atlantis FC-387 Condenser Microphone.
Recording - January 2013 - 41
Recording - January 2013 - Recording Fundamentals. Chapter 13: Monitors Part 2.
Recording - January 2013 - 43
Recording - January 2013 - PreSonus BlueTube DP V2.
Recording - January 2013 - 45
Recording - January 2013 - Getting Into Your Head.
Recording - January 2013 - 47
Recording - January 2013 - 48
Recording - January 2013 - 49
Recording - January 2013 - Shure SE215 Sound Isolating Earphones.
Recording - January 2013 - 51
Recording - January 2013 - 52
Recording - January 2013 - 53
Recording - January 2013 - 54
Recording - January 2013 - 55
Recording - January 2013 - Readers’ Tapes.
Recording - January 2013 - 57
Recording - January 2013 - iOS Music Tools: Last-Minute Audio Gifts!
Recording - January 2013 - 59
Recording - January 2013 - 60
Recording - January 2013 - 61
Recording - January 2013 - Sennheiser HD800 Headphones.
Recording - January 2013 - Advertiser Index.
Recording - January 2013 - 64
Recording - January 2013 - 65
Recording - January 2013 - 66
Recording - January 2013 - 67
Recording - January 2013 - 68
Recording - January 2013 - 69
Recording - January 2013 - 2012 Annual Index.
Recording - January 2013 - 71
Recording - January 2013 - Fade Out.
Recording - January 2013 - Cover3
Recording - January 2013 - Cover4
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