Feb 1, 2000 12:00 PM, Barry Rudolph


Education Guide

Mix is gearing up to present its longstanding annual Audio Education Guide in its November 2014 issue. Want to have your school listed in the directory, or do you need to update your current directory listing? Add an image, program description, or a logo to your listing! Get your school in the Mix Education Guide 2014.

Active/Passive Direct Box The APD-1 Active/Passive Direct Box ($349 retail) from Raven Labs is a battery-powered unit that runs for 100 hours, making it perfect for remote recording. There are two independent instrument inputs each with its own mute switch as well as a master output mute button and LED indicator. An unusual feature for a DI box, the APD-1 has a sidechain effects loop with blend control. You can record "dry" but hear yourself with effects, as the effect/dry mix can be switched solely to the 11/44-inch amp out jack. There is also an XLR pad with -20dB, -10dB, 0dB and +6dB positions, a ground lift switch, isolated tuner send jack, effect send and receive jacks, and a dual 9-volt battery holder compartment. The unit runs on + and - 9 volt rails or from the included wall wart, although there is no provision for phantom power.

The APD-1's electronics are augmented by a multiple arrayed geometric inductive coupled balanced output transformer that is Trifiler wound with oxygen-free copper magnet wire. Input impedance is 10 megohms for negligible loading of your guitar's pickups, and the maximum output level is a hefty 6 volts RMS (into 1k ohms). Specs include a 10 to 60k Hz frequency response, THD of 0.004% and signal-to-noise ratio said to be greater than 95 dB unweighted. I used the unit for recording a bass guitar with a passive pickup, as I prefer an active DI in that application. With so little insertion loss, the APD-1 offers a hot output signal with full isolation. Its sturdy steel box and construction is a good bet for the studio or stage, as the unit was (accidentally) kicked across the floor during a take with no sonic change...the tape playback proved it!

Raven Labs: 818/368-2400; www.raven-labs.com.

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